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Fully customizable all-in-one workstation. 300 GB SSD / 32 GB max RAM / Windows 7 Professional / Intel Core, Xeon, or C206 Chipset

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LG LM270WQ1 (SD) (BD) backlit replacement

I have a workstation HP Z1 all-in-one with the backlight working partially, in the overall is good but on the left is dimmer. I found online the option to replace the screen but the exact model is impossible to find without moving with hp spare part which is extremely expensive, considering I have taken a refurnished model. The screen is LG lm270wq1 (SD) (BD) and I found a lot of different end code (A1) (B1) (E3), so I want be sure to find the best and cheap way to restore the backlight, are those model compatible? Is there a website where I can buy just the backlight?

Attached 2 pics with the faulty and the serial

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Thank you all in advance for the support

Contestado! View the answer Yo también tengo este problema

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I have an HP Z1 with the LG 27" display. It exhibits the exact same "backlight shadow" as shown above.

I've replaced LED backlights in a 50" TV, so I have an idea of what's involved.

My question is, on this panel, are there rows of left and right LED strips behind the panel, or are they just along the top and bottom (edge lit)? Thank you kindly in advance.

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@Duncan McAllister should be an edge lit monitor but it will depend on what panel they popped in there. Once you remove the back cover check the label and try a search for the datasheet

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Thank you kindly for your timely response. It's one of the LG LM270WQ variants.

I got the thing apart and there are two LED strips along the bottom edge of the panel. The left strip is shorted -- all the individual LEDs test OK with a meter.

But on startup, the strip just flashes for a second, and then the PSU shuts it off. I removed and resoldered the connector with a hot air station, but no dice. I've ordered a new pair of strips.

I'm going to try to photograph the various steps when I reassemble the panel. I think it would be useful to have a step-by-step teardown of the actual panel itself, with all the different layers. That's one thing I couldn't find anywhere online.

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Solución Elegida

@gabe981 if you are saying that the once you found are

LG lm270wq1 (SD) (A1)

LG lm270wq1 (SD) (B1)

LG lm270wq1 (SD) (E3)

then the only way to determine compatibility is by downloading the datasheet. Armed with that information you can at least check the connections and connector compatibility. It is possible that some of those screens would work. Backlight LED strips are available so check places like this

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Thanks @oldturkey03 for your answer, yes I mean those models, Imac screens are more in stock and easy to find respect the HP Z1.

I found this website where there are a lot of technical details on the LG screens, http://www.panelook.com/LM270WQ1-SDDB_LG...

Do you think I need to find out the datasheet only? If so do you know where can I find them?

I was thinking that I should replace just the Lamps with new strips backlight, I ve never done that, I should try out or find some schemes, but definitely is something would reduce the costs as the screen works perfectly.

Thank you again

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@gabe981 you would need the datasheet for each one of those. I would try to replace the backlight strips as well. It will be necessary to disassemble the panel but definitely doable. When you disassemble the panel make sure that you skip the diffuser sheets (plastic appeararing sheets) in the proper order as well as the proper direction. Do not mix them up or flip front to back :-)

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thanks again @oldturkey03 , I found the datasheet and those models are different in something, probably could work but it is risky. I found online a lot of people with the same issue on all pc assembled with LG monitors, similar serials very used on the Imac 27''. it needs some test but there are 2 option and possible solutions, the first is poor connector solder on 6 pin cable on the left (solution should be redoing the solder and change connector, or try to get a better contact between the cable and the sensor on the screen) the second one should be a manufacturing (again) mistake on the backlight inverter (solution, replace the controller) both cases need more investigation, I am reluctant right now as I need to deliver a job and can't dedicate time, but I will do that. If you can help me can you just suggest where to buy the inverter? I struggle here too, to find the right model, and HP wants to send the workstation to a customer service, which is expensive and takes time,

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@gabe981 the inverter should be part of the power board in your monitor. So you'd be replacing that board. The controller board is actually part of the monitor and will be hard to replace (if it is even available) due to the nature on how it is mounted to the panel.

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search any display the last two letters do not matter, keep the cables from the display with problems you will need as well as the electronic board with the vga connector

the ones on the older poppy can work without any problem provided the plate is replaced

translated by goole

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otherwise I am at your disposal with advice and guidance

translated by goole

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