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[Solved] Philips 55PUS6754/12 TV: No Picture, Only Sound, Backlight Flashing

jack49 53748 30
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  • #1 19870224
    jack49
    Level 12  
    Hello everyone

    I own a Philips 55PUS6754/12 TV, after about 2.5 years of use the picture has disappeared - the sound works. No menu or anything else is displayed. The only thing you can see is immediately after switching on a short flash around the bezel (probably from the backlight). I have tried shining a torch into the screen to determine if this is just a backlight LED problem but the screen does not seem to display anything.
    I haven't disassembled the TV yet but from what I gather there should be a power supply board and motherboard. Without taking off the guts can you somehow explain where to put the meter to check something?
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  • #2 19870330
    krakarak
    Level 42  
    jack49 wrote:
    I own a Philips TV ...as far as I can tell there should be a power supply board and motherboard.
    Without a picture of the guts can you somehow explain where to put the meter to check something?

    You are clued up :cry: ... And you want to fix the TV yourself? :idea: ...
  • #3 19870342
    jack49
    Level 12  
    I don't so much want to repair but rather determine if any module or matrix is damaged and if it is worth repairing. I don't want to check every capacitor/resistor etc.
  • #4 19870374
    krakarak
    Level 42  
    Well, once you've established without checking then decide if it's worth it to you, because I don't know your financial resources....
  • #5 19870383
    jack49
    Level 12  
    I don't quite understand you, how without checking? I am asking if there is a simple way to check what is broken. I don't care about repairing a particular board, if it costs 300PLN I'll order it and replace it, but if it's a 1500 matrix there's no point.
  • #6 19870403
    Wojtek M
    Level 39  
    jack49 wrote:
    I tried shining a torch into the screen to determine if it was just a problem with the backlight LEDs but the screen doesn't seem to be displaying anything.
    Only Do this completely in a darkened room and with some TV programming on.
  • #7 19870437
    jack49
    Level 12  
    Wojtek M wrote:
    Only do this completely in a darkened room and with some TV on.
    .
    Well here's some good advice. Previously I shone a torch under normal lighting conditions, now I turned the lights off and found that the matrix works!
    Now the question - is it a problem with the LEDs or rather with some kind of driver? Let me remind you that you can see a flash for a moment during start-up.
  • #8 19870487
    Wojtek M
    Level 39  
    All LED strips are replaceable with NEW ones! But first you need to dismantle the matrix and find out exactly, if you have not dismantled such large matrices (55 inches) , you need to have it done by a professional. Also, there may be a break on the LED connectors in the middle of the matrix, but without dismantling the matrix you won't find out. Good luck.
  • #9 19870506
    jack49
    Level 12  
    OK, then I still have a question, are the T-con and inverter the same thing? What are the chances that, apart from the LEDs, the electronics have died?
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    #10 19870551
    Wojtek M
    Level 39  
    jack49 wrote:
    I still have a question - is the t-con and inverter the same thing? What is the chance that the electronics have died in addition to the LEDs?
    This is something else entirely. The chance that something else has broken is minimal, but without opening the TV, taking measurements and opening the matrix we won't know.
  • #11 19870572
    jack49
    Level 12  
    All clear, thank you for your help. The TV is going for repair tomorrow.
    The most important thing for me was the initial diagnosis, so that, on the one hand, I didn't bother someone if the repair is uneconomic and, on the other hand, I didn't want to get screwed.
    Regards.
  • #12 19921177
    patrickpaulinski
    Level 5  
    Hi, I have the same problem on this model. What has been diagnosed? What are the repair costs?
  • #13 19921182
    jack49
    Level 12  
    The backlighting of the matrix has failed. Cost 600zł, after replacement everything works. How old is your TV?
  • #14 19921198
    patrickpaulinski
    Level 5  
    Purchased on 30.12.2019. Warranty ended, image ended :D .
  • #15 19921203
    jack49
    Level 12  
    Well with me the same (about 2.5 years), maybe such a batch. In my opinion, this 600zł is at the limit of profitability, but due to the fact that the TV almost new is worth the risk.
  • #16 19921209
    patrickpaulinski
    Level 5  
    Philips 55PUS6754/12 TV: No Picture, Only Sound, Backlight Flashing .

    I can only see so much
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  • #17 19921213
    jack49
    Level 12  
    At my place it was even worse, I had to shine a torch at the screen in a completely dark room to see anything.
  • #18 19921214
    patrickpaulinski
    Level 5  
    Do you think it will be the same with me?
  • #19 19921227
    jack49
    Level 12  
    Everything points to this
  • #20 19921262
    patrickpaulinski
    Level 5  
    Tomorrow I'm ordering the slats when they go on the online shop and at the weekend I'm doing the service :D .
  • #21 19921266
    jack49
    Level 12  
    Have you ever done this before? I heard from a guy who does this professionally that there's a good chance he'll damage the matrix with the whole operation.
  • #22 19921291
    patrickpaulinski
    Level 5  
    If my son hits it with his hands and it works, I certainly won't damage it :D .
  • #23 19921537
    398216 Usunięty
    Level 43  
    patrickpaulinski wrote:
    If my son hits it with his hands and it works, then I certainly won't damage it
    You bet? The advice that colleague jack49 is talking about mentioned taking the matrix apart, but that's different from boxing exercises.
  • #24 19921856
    jack49
    Level 12  
    Exactly as the colleague above says. Think it over, because firstly it may turn out that in order to save 300zł you will completely destroy the TV and secondly you may end up with uneven backlighting.
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  • #26 20199096
    marian pazdzioch
    Level 12  
    I have repaired 9 units of this model. In all of them, the cause was the connections between the slats.
  • #27 20242253
    SzczechDawid
    Level 2  
    marian pazdzioch wrote:
    I have repaired 9 units of this model. In all of them the cause was the connections between the slats.
    .

    Mr. Marian, can you be more specific?
    Where to look for this trim? Is it repairable? Do you have to buy a new one? What does it look like?
  • #28 20242439
    elmo071
    Level 30  
    A set of led strips to be replaced. There is no point in replacing only damaged strips. Because in any case, after a short time any of the strips that have not been replaced will burn out. You need to be careful when removing the matrix, because sometimes in Philips the matrix is glued to the matrix frame.
  • #29 20242779
    SzczechDawid
    Level 2  
    I took the dies apart. I found the strips. I checked each diode separately with a meter and at low voltage each one shines with a weak light. At power supply voltage only one strip flashes with a strong light, the rest with a weak light (as from the meter). Still looking for a fault on the side of the strips? Or something with the power supply?

    Today I will try to check the individual strips, but I need to find a voltage source for the whole strip. Is 18V enough? Or 24V?
  • #30 20242913
    Wojtek M
    Level 39  
    SzczechDawid wrote:
    With the voltage from the power supply only one strip flashes with a strong light, the rest with a weak light.
    Don't "kick the door open"! all strips to be replaced with NEW! Such checking of LEDs as you described is no checking at all!
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Topic summary

The discussion revolves around a Philips 55PUS6754/12 TV experiencing a loss of picture while sound remains functional. Users initially suggest checking the backlight and LED functionality, with one user discovering that the matrix works when viewed in a dark room. The consensus indicates that the issue likely lies with the LED strips or their connections, rather than the T-con or inverter. Several users share their experiences, noting that replacing the LED strips resolved similar issues, with repair costs around 600 PLN. Caution is advised when disassembling the TV, as improper handling can lead to further damage. Ultimately, one user successfully replaced the LED strips and identified damaged connectors as the root cause of the failure.
Summary generated by the language model.
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