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To some (or most) people, Save Files for precious childhood games are important. So you could imagine how horrifying it may feel to wake up one morning, boot up your favourite retro game, and find that all your save files have completely disappeared. Not only that, every time you try to make a new file, it keeps disappearing every time you reboot the console and try to go back to it.

Unfortunately, this means that your precious game cartridge has fallen victim to the dreaded case of flat batteries.

A minority of Retro Game Cartridges (at least for N64 titles) were manufactured with a Volatile Memory Flash type known as Static Random Access Memory (SRAM). SRAM is slightly similar to the RAM in a PC. Because it is Volatile Memory (as said before), once the SRAM chip loses its supply of electricity, all data written to the chip will disappear. Of course, the way manufacturers solved this problem was by installing a small battery connected alongside the chip.

I found about this over half a year ago (as of writing this guide in August of 2016). After some research, I found that my nearly 20 year old Nintendo 64 Game Cartridges could be at risk of losing their saves. To add an increased stress factor to that discovery, the games that had SRAM saves just so happened to be the most important to me: Super Smash Bros. and The Legend of Zelda: Ocarina of Time.

Given that some peoples Cartridge Batteries haven’t died yet, there was also the possibility that my N64 Games could retain their saves for many, many more years to come.

But being the paranoid I am, I wasn’t going to take that risk. I invested a whole month’s worth of research into the proper way to replace a Game Cartridge battery WITHOUT losing power to the SRAM chip.

A wide variety of guides showed me how replacing the battery is done. Most notable is YouTube user Chris, whose channel goes by the name of “Memories in 8-bit”. His videos are excellent and taught me most of what I know on the subject today. I highly recommend checking out his channel.

Throughout my troubles trying to find a way to save my saves, I found out that it is possible to replace the Cartridge battery without losing the save files by hooking the cartridge up to a Parallel Battery Setup. Doing this would ensure that the power supply to the SRAM has a parity without doubling voltage.

This proved almost difficult to achieve in the subject circumstances however, but I took these findings to my grandfather, who after looking at the circuit board of the cartridge, found a way that it could be done. With his helpful advice, I was able to successfully rescue my Super Smash Bros. save files, as well as the saves of my friends SNES Games.

In this guide, I will show you the best way to replace a Cartridge Battery. More specifically, I will show you how to do this WITHOUT LOSING YOUR SAVES!

    • Before going further with the guide, it is important that I note there is a risk of injury if you do not follow these steps correctly and do not apply proper safety measures.

    • I advise wearing good Safety Glasses and some proper Gloves good enough for the task at hand. (I may not have gloves on in this guide, but I do have a few unpleasant burn marks to prove why I should have. So don’t make the same mistake, or you’ll end up soldering yourself.)

  1. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Required Tools: paso 2, imagen 1 de 1
    • Ensure that you have the required tools and parts necessary for this replacement, as detailed above.

    • Use this image for visual reference. (Note: one of the Batteries and Battery Holders are missing from this image. See step 3 for details.)

  2. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Parity Battery: paso 3, imagen 1 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Parity Battery: paso 3, imagen 2 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Parity Battery: paso 3, imagen 3 de 3
    • Before we get to the main event, we need to create a Parity Battery that we'll use to maintain power supply to the Cartridge during the replacement process.

    • Take one of the Battery Holders and two pieces of the pre-stripped Copper Wire. Solder one end of each wire on to each of the two pins of the Battery Holder. Be sure to apply a generous amount of solder to the connections to make sure they connect well and are reasonably durable.

    • Once you're done soldering on the cables, it should look like the images in this step.

    • Also, it is a good idea that you tin the other ends of the cables (as shown in the third image in this step). If you don't know what tinning is, check this link for details:

    • It is also a good idea to label each cable if you need help remembering witch cable connects to the positive end of the battery as well as which cable is the negative end. This will be very important later on.

  3. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Cartridge Disassembly: paso 4, imagen 1 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Cartridge Disassembly: paso 4, imagen 2 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Cartridge Disassembly: paso 4, imagen 3 de 3
    • Now on to the main event. Start by connecting your 3.8mm Gamebit to your Modular Screwdriver. Use the Screwdriver to undo the two Gamebit screws that hold the cartridge together. Once undone, carefully remove the back cover of the cartridge to expose the inner metal shielding.

    • Now take your Philips-head Screwdriver and undo the two Philips-head screws at the bottom corners of the metal shielding. Remove this metal shielding to expose the cartridge circuit board.

    • You can now see the Cartridge PCB with the attached Coin Battery, the source of the problem which we will soon fix.

    • From here, carefully remove the PCB from the cartridge casing. Remove the black plastic shield on the cartridge pins and place the PCB on your workspace.

  4. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Identifying the Battery Solder Terminals & how to use the Parity Battery: paso 5, imagen 1 de 2 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Identifying the Battery Solder Terminals & how to use the Parity Battery: paso 5, imagen 2 de 2
    • Now looking at the PCB on it's own, Take note of the 4 Solder Terminals marked on the second image of this step.

    • The two terminals circled in Red are the Battery terminals. These terminals compose of the positive and negative pins attached to the battery on the other side of the PCB. The positive terminal is the one higher on the board in this image, while the negative terminal is the one below the first.

    • The two terminals circled in Green are the Resistor terminals. The two terminals are the ends of two resistors seen on the other side of the PCB. Why are these important? Well, these terminals are what we will be connecting our Parity Battery to.

    • Why connect the Parity Battery to resistors you ask? Well there's logic behind this. Take note of the PCB around the two battery terminals on the first image of this step. If you're unaware of how circuit boards work, the lighter green areas of a PCB (visible in the image) indicate a copper lining under the solder mask.

    • This copper lining is the link between certain terminals on the PCB. In this case, you'll notice that there's copper lining on the board that links the positive batter terminal with the resistor terminal next to it. The negative terminal in the same respect. This is marked in the second image written in blue.

    • To confirm this, you can use your Multimeter to check the voltage of the battery on its two terminals (Red). if you check the two resistor terminals (Green) in the same way, you'll notice that it displays the same voltage as the battery terminals.

    • By attaching the Parity Battery to these resistor terminals, electricity will continue to run through the PCB and hold the sensitive data stored on the cartridges SRAM. Meaning that while you replace the Main battery on the PCB, the cartridges saves will not be deleted the moment that the board loses power.

    • KEEP IN MIND, that the positive end of the parity battery must connect on the positive circuit of the PCB. Parity is ONLY achieved if the positive and negative ends of the battery are connected to their respective circuits. If you connect the battery the other way around, you'll end up connecting your batteries in Series, which increases Voltage.

  5. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Attaching the Parity Battery to the PCB: paso 6, imagen 1 de 1
    • Now, we will connect the Parity Battery to the PCB as shown in the image of this step. Many things could go wrong here, so ensure that you have properly followed Step 2 and you are confident in handling a soldering iron for precision jobs.

    • Begin by heating up the two ends of the parity batteries cables to the point that the tinning on them starts to melt again. CAUTION: Be careful that you do not cause to much heat as it may adversely affect the battery itself.

    • Now start heating up the resistors terminals (circled in green on step 5) to the point that the solder on them starts to melt. CAUTION: Again, be careful how hot the terminals get. You don't want to damage the resistors OR the board itself. Also, too much heat may add extra resistance on the power coming from the battery, losing the SRAM data.

    • For the novices: The reason you need to heat up both ends of what you're soldering is because the solder itself needs to "Flow" onto both surfaces like liquid and that's only possible when they're hot. Looking at the solder terminals as they are now (the images in step 5), you can see how well those solders look. That's what we need to achieve.

    • This is your last warning: DO NOT MIX UP THE POSITIVE AND NEGATIVE ENDS OF THE PARITY BATTERY WHEN CONNECTING TO THE BOARD! You want the batteries in Parity, not Series.

    • Now, carefully solder the end of the parity batteries positive cable to the Higher resistor terminal. Ensure that the solder properly flows onto both the resistors pin AND the end of the parity batteries cable almost like liquid. Again, be careful about how much heat is applied. You need to melt the solder, but you must not damage anything.

    • Follow the same method for soldering the end of the parity batteries negative cable to the LOWER resistor terminal.

    • Once you feel the parity battery is properly attached to the terminals, let the solder cool for a minute or two.

  6. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Testing the Parity Battery is working: paso 7, imagen 1 de 2 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Testing the Parity Battery is working: paso 7, imagen 2 de 2
    • Now to test that you've made a good connection with the solder. Set your Multimeter to 200 Ohms and test the connection between the main battery terminals and the parity battery. For visual reference, do as shown in the two images on this step.

    • The Ohm reading you get by testing the connections should show a solid number somewhere around 1 Ohm. This indicates that you've made a good solder connection.

    • You'll see that the reading I got when testing my negative connection (second image) shows 1.2 Ohms, compared to the much better reading from the positive connection (first image) which shows 0.9. Although it's not perfect, it's all good as long as the number does not variate to far from 1 Ohm. If it does, the connection is loose.

    • Another test to do is to check the voltage now shown when testing the main battery. You should now see the voltage read somewhere higher than 3v rather than when the old battery would show something more along the lines of near 3 or 2.98. Either way, seeing a slightly higher voltage than before means you've successfully created a Parity system.

    • I don't know what would happen if you accidentally put your batteries in Serial, but I'm pretty sure your cartridge would explode (or something like that) if it suddenly had 6 volts running through it. This is why it's important to make sure you put the positive cable of your parity battery onto the positive end of the PCB battery area.

  7. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Removing the old Cartridge Battery: paso 8, imagen 1 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Removing the old Cartridge Battery: paso 8, imagen 2 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Removing the old Cartridge Battery: paso 8, imagen 3 de 3

    • Now that the parity battery is attached, it's time to remove the old battery that we'll be replacing.

    • Grab a flat head screwdriver in place it underneath the battery on the other side of the PCB. Now start carefully heating up the solder on one of the main batteries terminals. While melting the solder, use the screwdriver to carefully push the battery out from the board using the screwdriver as a lever.

    • Eventually, the battery should come loose and the pin should fall from the PCB easily, given you're providing enough pushing force with the screwdriver.

    • Follow the same method for removing the other pin from the PCB. This time however, you can pull the battery out while melting the solder rather than using the screwdriver to lever the battery out.

    • Just to be sure, use your Multimeter to test the main battery terminals after you've removed the old battery and check that there's still electricity running through the circuit. If you get a stable voltage reading from the main battery terminals (circled Red in step 5) after you've removed the old battery, then your save game is still safe.

  8. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Cleaning the Battery Terminals: paso 9, imagen 1 de 2 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Cleaning the Battery Terminals: paso 9, imagen 2 de 2
    • Now to clean the old solder out of the main battery terminals. This is done to ensure you can put the new battery in easily.

    • Again, start carefully heating up the solder on and inside the main battery terminals. While the solder's hot and melted, use you Soldering Pump to extract the solder off of the terminal and out of the inside of the terminal. It might also be a good idea to have someone else use the soldering pump for you while you use the soldering iron.

    • If there's still some solder left inside the terminal, you may have to use something thin to file it out. Keep in mind that this is a last resort as there's a risk of tiny bits of solder going everywhere after filing.

    • After cleaning the terminals, the result should be something like the second image of this step.

    • Although it's a bit blurry, you can clearly see that the terminals are very clean and open.

  9. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Connecting the new Battery/Battery Holder: paso 10, imagen 1 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Connecting the new Battery/Battery Holder: paso 10, imagen 2 de 3 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Connecting the new Battery/Battery Holder: paso 10, imagen 3 de 3
    • Now to connect the new battery onto the PCB. In this guide, I've used a CR2032 Battery Holder designed for use with any and all Nintendo cartridges. However, you're free to use a standard CR2032 battery with pins already attached to it. A battery holder will make future replacements easier.

    • Place the new battery in the same position that the old battery was in on the PCB.

    • NOTE for Battery Holder users: You may need to modify the holder slightly. Take note of the second image in this step. One of my cartridges resistors was placed very close to the battery and resulted in it blocking the placement of the holder. If you're in a similar situation, you will need to file off the corner of your holder as shown.

    • With the battery in place, begin to carefully heat up the terminal and the batteries pins.

    • I use the word "carefully" in the literal sense. Heating up a battery is universally NOT a good idea, but all you need is just enough heat that the replacement solder will flow on to the pin properly.

    • Once the terminals and pins are hot enough, begin applying a generous amount amount of new solder to the space between the pins and the terminals.

    • Once you're done, you should have something that looks like the third image in this step.

    • Let the solder cool off after you're finished. Test the terminals with your Multimeter to make sure everything is still operating normally.

  10. Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Detach the Parity Battery: paso 11, imagen 1 de 2 Nintendo 64 Game Cartridge Battery Replacement WITHOUT LOSING SAVE FILES., Detach the Parity Battery: paso 11, imagen 2 de 2
    • Now for the final part. Exercise caution as you did in step 6.

    • Begin heating up one of the terminals your parity battery is attached to. Make sure you're heating up the resistor pin, the terminal, and the parity batteries cable end as you're doing so. While heating up the solder, gently pull on the cable until it comes loose.

    • If you happen to pull off too much solder when detaching the parity batteries cable, quickly start applying more solder to the resistors terminal to ensure the connection remains solid. You don't want to go through all this work for nothing.

    • Do the same thing for the next resistor terminal.

    • After you've taken off the parity battery, get your Multimeter and test both the main battery terminals and the resistor terminals to make sure that your new battery is supplying a solid 3 volts of power to the cartridge.

    • Also check for an Ohm reading between the resistor terminals and the main battery terminals on their respective copper lining circuits. You should again get a reading of around 1 Ohm in your tests.

    • If everything checks out, then that's it! You're done! You've successfully replaced a Nintendo 64 cartridge battery and, if everything went smoothly during the replacement, without losing power to the SRAM chip and deleting your Save Data!


Reassemble the Cartridge in reverse of the way you disassembled it. If all went well during the process and you followed every step correctly, then you did it! Congratulations, and enjoy your preserved Save Game!

3 personas más completaron esta guía.


Miembro Desde 17/08/16

1 Reputación

1 Guía escrita

47 comentarios

Hello Jackson! I think I confused of place when I wrote jejeje

Congratulations on the item! I would like to replace the batteries of my games. What is step 5 ? How do I change the battery without losing memory?

Than you very much.


danicrespo_vk_1 - Contestar

Apologies. This guide is unfinished and not meant to be public yet.

Jackson -

The guide is now complete. Good luck!

Jackson -

Right now I’m on mobile, so I’ll come back and point out the specific things I’m referring to. But for now I’ll say, there are major issues with the electrical engineering advice in this guide!

Don’t get me wrong, adding a second battery/power source while replacing the one on the board is correct. However, some of the tests / explanations / information provided in this guide are totally off-base

Tyler Winn - Contestar

Please make your follow-up comment soon. I’m eager to know exactly what issues you’ve discovered in this guide.

If something’s wrong, I’m more than happy to rectify it.

Jackson -

I am extremely grateful you took time to reply to me, as The Legend of Zelda Ocarina of Time is my all-time #1 favorite game, and I really want to get it working again. I’ll give it another shot right away! I’ll keep you updated.

Skull Kid - Contestar

Now the resistor’s seem to work, but it still will not keep a new save file. Strange indeed…

Skull Kid - Contestar

Here are some quick troubleshooting steps I would like you to perform on the cartridge. Do them in order.

1: Make sure the solder connections on both the resistor terminals and battery terminals are solid. This includes the condition and amount of the solder on these terminals.

2: Do a resistance check on the resistors themselves. The resistor next to the batteries positive terminal should read 1k ohms. The resistor next to the negative terminal should read 100k ohms.

3. Instead of doing a voltage test on the resistors terminals that are marked green in Step 5, do a voltage check using the terminals on the opposite end of the resistors. It should give a slightly lower voltage reading than if you were testing the green marked terminals or the battery itself.

Jackson -

On the positive resistor, it reads (with the multimeter set to 20k) 0.98 ohms. The negative resistors reads 95.6 (with the multimeter set to 200k).

The resistors on the other side (left side, with the back facing up) gave a voltage of 2.9. On the right side, they give 2.93 volts.

This is not good news, is it?

Skull Kid -

If you cannot find anything that looks damaged or of questionable quality on the PCB, then this is indeed concerning. Before going further however, I would like you to do a quick test.

Firstly, Take some tape and cover the top of the battery and the holder it’s in. Make sure none of the top of the battery or the holder is exposed.

Secondly, when disassembling the cartridge you will have had to remove a kind of metal casing around the PCB itself. Reassemble the cartridge, but do not include this metal casing.

Now start the game and test to see if the cartridge is still unable to hold save data.

Jackson -

The reply button has magically disappeared… so I hope you can still read this… but no, the cartridge doesn’t save. I cannot seem to see any damage to the PCB. The strange thing is, that when I pressed the battery holder, with a rubber glove, it worked a few days ago. Even when not pressing it it saved once or twice, but then suddenly went back to not saving again. Really mysterious… And all this was without the case, of course.

Skull Kid - Contestar

At this point I would need to see pictures of your cartridges PCB in order to determine if I can offer any further advice. If you are able to, please upload high quality photos of both the front and back of the PCB and post the link to the photos in a reply here.

Jackson -

Alright. Here’s the front and back. Sadly, the holes for the battery tabs are a bit enlarged after I got it back from a reckless repairing job from a friend of mine. Hopefully it will still work, not sure.!ApLSCpwG0n6xgpZgkctk...

Skull Kid - Contestar

One final check. Test to see if there’s any continuity between both positive and negative battery tabs. If your multimeter doesn’t have a continuity test mode, set it to check resistance.

Jackson -

Yes, I get that beeping sound, and it reads 0.

Skull Kid - Contestar

I might have a clue why it won’t save. Sometimes the resistors gives voltage, sometimes they don’t? I’m stumped…

Skull Kid - Contestar

A bit of shame on me for not thinking to test this before.

There is continuity between the positive and negative terminals of the battery. There absolutely should NOT be. Somewhere on or around the battery holder is something physically linking the positive and negative ends of the battery on the PCB. You will need to find and cut this link. There could be a number of reasons as to what is causing the two terminals to be joined together. The battery holder may be of poor quality and is joining both ends of the battery itself together, or somewhere (probably under the holder is my best guess from the photos) is some solder or something similar physically linking the terminals.

I am confident that once the terminals are physically separated and there is no longer any continuity between the battery terminals, that power will go to the SRAM chip properly and your cartridge will be able to hold save data again.

If somehow it still doesn’t work, then I unfortunately have no more advice I can offer.

Jackson -

Here’s two side photo’s. So it shouldn’t beep from the battery holder’s terminals?!ApLSCpwG0n6xgpZkbo19...

Skull Kid - Contestar

No. There should be absolutely no continuity between both the positive and negative terminals of the battery. When doing a continuity test on the battery terminals, it should not beep.

Jackson -

Alright. I will have to troubleshoot some more then. The resistors though didn’t get voltage now. A moment ago yes, but not now. I haven’t done anything except removing and replacing the same cr2032 battery to it.

Skull Kid - Contestar

When squeezing the battery holder, it seems as the resistors get’s voltage… Strange thing is that the very same battery holder on my spare Ocarina of Time works just fine.

Skull Kid - Contestar

The only advice I can offer now is to find whatever is joining the two battery terminals together as it should not have continuity between them. You will need to find this on your own since I cannot determine what it could be from any of the photos. Good luck.

Jackson -

I appreciate all your help. Thanks!

Skull Kid - Contestar

I think I might have missed something. There’s no continuity between the terminals and doesn’t beep, when checked on the back like so. Is this the order you said they should be in? The resistors do get voltage right now.!ApLSCpwG0n6xgpZnBNUR...

Skull Kid - Contestar

If you are no longer reading continuity between the two battery terminals and there is a voltage reading on the resistor terminals, try testing if the game can hold save data again.

Jackson -

The resistors have at least as of typing this 3 volts, so does the battery terminals. Still, the game won’t save. This is indeed worrying…

Skull Kid - Contestar

I’m going to get myself a magnifying glass, to see if I can make out any damage to the board.

Skull Kid - Contestar

Using the image linked below for reference, check the voltage of the terminals marked in red, and check the resistance of each resistor in the terminals marked blue.!AlzCHZDR3GRkuCcFeBoC...

Jackson -

I get voltage on the red one's. On the resistors, it reads from left to right in the image, starting from the top-left: -41.2 ohms, 55.7 ohms and finally 56 ohms.

Skull Kid - Contestar

One final test. Check and report the voltage of the following terminals in the image below marked red.!AlzCHZDR3GRkuCjJvy5M...

Jackson -

I’m sorry for the late reply… got in trouble getting the voltage going to the resistors. Will probably have solved it soon. I’ll keep you updated on what those newest found terminals by you says.

Skull Kid - Contestar

I’ve sadly given up. I think one of the resistors is broken. As it is now in two pieces. I will see if I can buy a used Ocarina of Time, at eBay or something alike. I do however thank you for all your help and time.

Skull Kid - Contestar

My advice if you were to decide to keep working on the cartridge would be to firstly replace the resistor that has broken with an exactly equivalent one, with the other piece of advice to test the single capacitor on the PCB.

With voltage seemingly going through the PCB from the battery properly and no other component seemingly at fault, the next step would’ve been to see if there was anything wrong with the capacitor located around the lower middle of the board. I couldn’t see the capacitor bulging from the photos you linked, so the only way to test the capacitor for a fault without first desoldering it from the PCB would be to use some specialised equipment such as an ESR Meter or Smart Tweezers. To test the capacitor with a multimeter would involve desoldering it from the PCB first then testing the capacitor in resistance reading.

If however you do intend to give up on this, I suggest looking for a cartridge PCB on its own so you can install that into your current cart case, making sure it’s an identical PCB

Jackson -

I just want to put a new battery. (I don’t care about saves.) Which steps can I skip? This is not idiot-proof enough. :(

Philippe Morin - Contestar

Hello Philippe. If you wish to replace the cartridge battery without using a parity battery to hold save files during the replacement, you can essentially skip Steps 3, 5, 6, 7, and 11.

Jackson -

Thanks for writing this guide up. Your many tips are good. The one warning I would give is to not connect two batteries in parallel with significant voltage differences and to safely dispose of batteries connected in this way (careful of overheating, battery expansion/explosion in any case so thanks for the safety glasses tip). Maybe the batteries are not directly connected in parallel unless parity battery means something else in this context depending on the PCB layout. The max voltage difference of batteries would depending on max amperage specs of the battery and resistance and so on.

fixin_stuff - Contestar

Thanks. I plan to do a revision of the guide at some point. I’ll be sure to properly go over voltage difference risks.

Jackson -

This is what my old Ocarina of Time cartridge now looks like… is it still possible to get it to remember saves? The holes were widened with a drill (someone who helped me the wrong way… had no idea that was coming…).

I even bought a new set of resistors, and soldered on a new 100k resistor (the old one on my newer-bought Ocarina of Time was on 96 milli-ohms, this one now says approximately the same) when the multimeter was set to “200k” ohms.

This and this is what it looks like now. I’m currently having trouble getting the positive end of the battery holder (connected by a copper cable) to attach to the PCB. The new resistor is the one on “R2” (the blue one).

So, the question is, do the two ends of the copper cables absolutely need to go through the two holes?

If so, the damage may be irreversible now. Because of the wide holes… I’ve no idea…

Skull Kid - Contestar

Alright… the wires are now in place, and the battery gets voltage on the back, but not the positive and negative resistors right next to them.

Skull Kid -

I’m afraid the cartridge may now be very close to beyond repair with the condition it’s in, especially the drill holes. Physical mods to PCBs such as that require extreme care and total knowledge of what’s being done.

Your best option now if any is to try attaching the battery directly to the corresponding resistor terminals exactly as shown in Step 6 of the guide. But PLEASE take extreme care doing so as ruining these particular terminals will be the final nail in the coffin. I also noticed that you’re using rather thick cables for the battery which may be a form of hindrance to the precise nature of this work, so please take care in that regard as well.

If you’re still not detecting voltage on the other side of the resistors, make absolutely sure the battery is properly connected. If it is and it still isn’t working, I’m afraid this project may be a lost cause.

Jackson -

I understand. It was silly of me to leave it in somebody else’s hands without the proper knowledge, I realize that now.

It seems as the board now gets power on the back for the battery terminals. But the resistors does not. On the newer game, they do. Any ideas? The resistor R2 was replaced, as the original one was broken (I actually forgot how it happened, but it now reads when set to “200k” approximately about 96 milliohms) so it was replaced with that blue, 100k ohm one.

It’s most because of nostalgia and sentimental value that I keep trying to get this older game to work.

The voltage from the battery, on the back.

The resistors, nothing.

Skull Kid -

If there is no continuity between the battery terminals and the corresponding resistor terminals, no power will get to the resistors. the reason for this will very likely be the damage to the copper lining shown in the previous photos.

As a last-ditch effort, you could try bypassing the copper lining by connecting the battery terminals and their resistor terminals with some wire. If that doesn’t work, or you can’t find any other way to get the battery connected to the resistor terminals, I’m afraid the cartridge’s ability to save is done for.

Jackson -

The battery is getting power according to the multimeter on the other side. Now that the wiring is soldered to the resistors, I’m clueless to as why it won’t work. The “R2” reads approximately 100k ohms. I suppose that’s the correct value.

Skull Kid - Contestar

Sorry, the “R2” reads 83 ohms when set to 200k. I’m having trouble getting the solder to stick to the board at the moment as well. Is cleaning alcohol and a brush the best way of getting it clean? Or is there any other way of getting the solder to stick to the board?

Skull Kid - Contestar

I can also confirm that the battery terminal and resistor terminals do give results. I just don’t know if it is good or bad.

Skull Kid - Contestar

This is the board as of today. The only damage is to the battery terminals. But that’s been bypassed directly to the resistors from the holder.!ApLSCpwG0n6xgvNCTjPG...!ApLSCpwG0n6xgvND1Z5V...

Skull Kid - Contestar

Reconfirm that both Resistors work correctly. R1 should be 1K Ohms, R2 should be 100K Ohms. Then check that there is some kind of voltage on the other ends of the resistors. That voltage will be something under 3 volts since it’s going through resistors. If there is voltage there and the game still can’t hold a save file, then I’m afraid it’s busted unless you can identify what exactly the damage is that is preventing power from going to SRAM.

Jackson -

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