Why is my Philips TV screen is so dark?
Hi,
I've got a Philips 50PUS6162/12 UHD smart led tv and it's brightness has become very low this week. I mean I can see the menu, broadcast etc. but only in a dark room. The brightness is set to maximum in the settings and I reset it to factory settings as suggested but nothing changed. Sometimes the lower third of the screen is works fine for 1-2 minutes and than goes dark. I've measured the voltages on power board and they seems to be correct (as googled for some standard voltages). I've read that it may be T-Con that is causing the problem if led strips works, power seems right and every other thing seems good.
The warranty has just expired so please help :)
Thanks
Update (01/10/2020)
Thanks for your advices. In this case dark means I can see the picture when (at least) there is twilight in the room or I cover the screen from reflection.
It’s brighter on the picture than it really is. (My camera overcorrect brightness).I checked all the connectors, and reseated the wires. I also checked the boards for cold solder soints, bloated capacitors etc, but everything is good. I measured the voltages on power supply and the strip voltages are 37.5-38 V on every pin. The other connector (the upper) voltages must be 12 V and 3.5 V according to the inscription but there is nothing on 3.5 V pin. That is the only fault.
So I still don’t really know what’s wrong with it.
Update (03/01/2020)
Thank you @oldturkey03
I took some pictures as you requested.
I took two pictures of the display, one at daylight and the other in a darkened room, to see the difference.
I checked the connectors and reseated all of them but nothing has changed.
All of the LED connector voltages on the power board are 37.8 V.
I also made some pictures of the boards:
If the backlight is faulty, may all the LED strips go wrong at once?
Update (04/24/2020)
So after T-con, I replaced the power board too, but it’s still the same. Dark... Voltages are similar to my original power board so I guess it isn’t faulty.
What’s next? Should I disassemble it completely to the led strips, and power them manually?
Es esta una buena pregunta?
13 comentarios
Hi,
Have you checked the connections between the power board and the backlights?
It sounds more like a backlight problem as the TCON usually feeds vertically and you say that the lower third of the screen works for a bit and then goes dark.
- de jayeff
Yes, I checked all the connections.
I don't know if it's matters, but once I touched the bottom center of the tv (the frame) to lift it up, the whole display worked fine just for some seconds.
- de Patrik Bajusz
I just replaced the T-CON board and nothing changed. What should I do next?
- de Patrik Bajusz
Got the same problem, no backlight. Did you dismantle the LCD panel and check the backlight array yet?
Thanks.
- de Sigurd Henriksveen
Did u fix it and how?
- de niklas lindahl
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