LG 42PC51 plasma problem

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • MomirPeh
    New Member
    • Feb 2013
    • 4
    • Bosnia & Herzegovina
    #1

    LG 42PC51 plasma problem

    Hello, guys!

    I have a mentioned LG plasma and I had a power outage during the night. In the morning TV was dead. I narrowed the problem to a mosfet on the power board, replaced it and the TV powered on, but there was a red-white blotch on the screen, pulsating a bit and there were horizontal red lines in the bottom half of the screen. I have found that th YDRV board was toast (two of the chips, in fact) and I replaced it with one from ebay, so the red lines are gone, but the blotch is there... I checked the YSUS and the fuses, mosfets and the hybrid were all ok (no shorts). I also checked the voltages and the only one that was off was the 3.4V_ON line, which was 4.3V. I'm clueless on what to check next or what is my next suspect...

    Thanks in advance!

    P.S. This is a YouTube video of the problem:
    https://www.youtube.com/watch?v=ZRZis8ufU2o
    Last edited by MomirPeh; 03-15-2013, 11:08 AM. Reason: typo
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LG 42PC51 plasma problem

      The problem on this is probably Z-sus plus Y-buffer.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • MomirPeh
          New Member
          • Feb 2013
          • 4
          • Bosnia & Herzegovina
          #3
          Re: LG 42PC51 plasma problem

          Thanks for reply!

          I just checked the ZSUS IPM IC and there were no shorts either. Fuse checks out too.
          BTW, ZSUS board is: EBR36921701

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: LG 42PC51 plasma problem

              The IPM doesn't have to short to fail. To rule it out, you can use an oscilloscope. Potentially you can make basic tests with a DMM. Pictures would help.
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • MomirPeh
                  New Member
                  • Feb 2013
                  • 4
                  • Bosnia & Herzegovina
                  #5
                  Re: LG 42PC51 plasma problem

                  Here are some pictures of the ZSUS board, as requested.
                  Attached Files

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK
                      #6
                      Re: LG 42PC51 plasma problem

                      Oh, this one is quite different to typical LG IPM boards. You will unfortunately require an oscilloscope to test the output. You can't do it with a DMM.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                        Comment

                        • MomirPeh
                          New Member
                          • Feb 2013
                          • 4
                          • Bosnia & Herzegovina
                          #7
                          Re: LG 42PC51 plasma problem

                          Ok, I will try that during the next week, since I don't have the oscilloscope at home and I will have to bring one from work.
                          Thanks for help so far.

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: LG 42PC51 plasma problem

                              You should check you have a 10X probe (rated for 400V or more) and ideally, the scope should be 400V rated or more (in case you switch to 1X accidentally.)
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • theone111
                                  Problem with LG Plasma 60PM6700 - Random power downs
                                  by theone111
                                  I have an LG Plasma TV 60PM6700 for the past ~12 years.

                                  In the last ~3-4 months I have been having some issues.
                                  1. Problem: It started with random picture disappearing (sound still worked).
                                    Frequency: Happened about once a week.
                                    Solution: Had to turn off TV wait a few seconds before turning it on again.
                                  2. Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
                                    Frequency: Happened about once a week.
                                    Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve.
                                  3. Problem: TV shuts down
                                  ...
                                  1 Photo
                                  07-22-2024, 10:36 AM
                                • renech
                                  panasonic TH-42PC77U plasma television half screen problem
                                  by renech
                                  hello,
                                  I hope someone on this forum can assist me.
                                  I have a panasonic TH-42PC77U plasma television.
                                  the lower 1/2 of the screen has become flaky....in and out, then finally goes black and you can only see the top portion.
                                  i have performed the reset to default settings quite a few times. Panasonic recommended..did not believe this would help...it didn't.
                                  I have removed the back panel and looked around for something obvious...burn marks in a board, etc....nothing obvious...
                                  I have read some posts that suggest the problem is related to the boards on the left...
                                  12-12-2022, 06:53 PM
                                • Zeonalbasta
                                  Thinkpad X1 Carbon "LMQ-1MB 12298-2 48.4LY26.021" VCC3M problem
                                  by Zeonalbasta
                                  i have a problem with thinkpad X1 carbon gen 2 "LMQ-1MB 12298-2 48.4LY26.021"
                                  The laptop was turned off because the MOSFET was not transmitting voltage. After checking it turned out that the gate pin on the MOSFET was the problem, because it was producing an inappropriate voltage. and it was discovered that the problem was with the Think engine, so I decided to reprint each pin, and finally the mosfet could work properly. However, there is another problem, even though the voltage has been supplied to the laptop, it still won't turn on, there isn't even an LED indicator. After double...
                                  09-13-2024, 01:17 PM
                                • Gibon378
                                  Problem with stopping audio and video for no reason
                                  by Gibon378
                                  PC Specs:
                                  • CPU: Ryzen 5 1600
                                  • GPU: GTX 1080 Palit JetStream
                                  • MOBO: ASRock ab350 PRO4
                                  • RAM: Crucial Ballistix Sport 2x8GB 3000MHz (XMP 2.0)
                                  • PSU: XFX 650W (don't remember what model)
                                  • OS SSD: ADATA SP920
                                  • OS: Windows 10 21H2


                                  Problem description:
                                  Hi. I have a problem that has been going on for some time (2-3 years). It's hard to explain what it really is. Sometimes, my computer stops playing music, stops videos (starts buffering on youtube), there is no sound in games and when I minimize the game window and return to the game there is a black screen with window borders...
                                  11-19-2022, 09:41 AM
                                • perzyk23
                                  Lenovo T580 - LCD Panel problem - error 0288
                                  by perzyk23
                                  Good morning,
                                  I have a problem with Lenovo T580, which after error code 0288 suggests a problem with the display. I checked the display and it works on another laptop. I replaced the display cable with a new one. I programmed another BIOS (downloaded from this forum) and I still have the problem of a dead display - there is an image via HDMI, and the system does not detect the built-in LCD at all. The problem appears to be hardware. What can I check to confirm or disprove this? I found many threads on the Internet related to this problem 0288, but without specific solutions. Please advise....
                                  10-25-2024, 12:42 AM
                                • Loading...
                                • No more items.
                                Working...