Panasonic TH-L42U5K standby voltage help

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • maleksa
    Senior Member
    • Jul 2017
    • 50
    • Malaysia
    #1

    Panasonic TH-L42U5K standby voltage help

    The TV wont turn on and when power is plugged in, the LED will turn from Green to Red and then one Green blink before repeating (Green to Red and one Green blink).

    Any pointers is much appreciated.

    I also need help to identify which pin is the standby voltage. I only get the 5V for the 2 pins in the attached picture.
    Attached Files
    Tags: None
    • kasfamily
      Badcaps Veteran
      • Aug 2014
      • 765
      • Russia
      #2
      Re: Panasonic TH-L42U5K standby voltage help

      pin 10 and 11 is the standby voltage.

        Comment

        • kasfamily
          Badcaps Veteran
          • Aug 2014
          • 765
          • Russia
          #3
          Re: Panasonic TH-L42U5K standby voltage help

          what is the voltage at pin 16?

            Comment

            • maleksa
              Senior Member
              • Jul 2017
              • 50
              • Malaysia
              #4
              Re: Panasonic TH-L42U5K standby voltage help

              Originally posted by kasfamily
              what is the voltage at pin 16?
              The voltages on the various pins are as follows

              Pin 16 - Fluctuates between 2.25V to 0.14V
              Pin 12 - Fluctuates between 3.3V to 0V
              Pin 11 and 10 - 4.7V
              Pin 9, 8, 4 and 3 - 0V


              Appreciate your help/pointers

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12094
                  • U.S.
                  #5
                  Re: Panasonic TH-L42U5K standby voltage help

                  More pictures: https://www.badcaps.net/forum/showthread.php?t=39740

                    Comment

                    • maleksa
                      Senior Member
                      • Jul 2017
                      • 50
                      • Malaysia
                      #6
                      Re: Panasonic TH-L42U5K standby voltage help

                      Originally posted by nomoresonys
                      More pictures: https://www.badcaps.net/forum/showthread.php?t=39740
                      Apologies guys. Here are pics of the entire back of the TV, the power board and the main board.

                      Cheers
                      Attached Files

                        Comment

                        • nomoresonys
                          Badcaps Legend
                          • Jan 2013
                          • 12094
                          • U.S.
                          #7
                          Re: Panasonic TH-L42U5K standby voltage help

                          A test, UNHOOK cable from powerboard to mainboard on mainboard side, use three 1k ohm resistors and jumper from pins 10 and or 11 to pins 12, 14 and 15, one easy way is trace the wires back to the end you unhooked and jumper thru that connector end, plug power cord in, see if backlights come on and stay on and recheck those voltages, see if they are all there and steady.

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • tvguy12012012120
                              Zombie Samsung UN55NU6900F dead / no standby voltage - randomly came to life after hours of troubleshooting then died
                              by tvguy12012012120
                              This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.

                              Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....
                              02-07-2025, 05:13 PM
                            • BobbyMJ
                              Panasonic TC-P60S30 - no standby voltage
                              by BobbyMJ
                              Hi All,
                              Wanting to learn some electronics repair skills.
                              I found a non working Panasonic TC-P60S30 and this is my first project / attempt.

                              So far I have found a blown cap on the main power supply board.
                              After replacing it there's still no standby power.

                              Poked around and found a resistor on the PSUB power supply board that measures open.

                              An online resistor calculator shows this is a 93k ohm resister.

                              My questions:

                              Is that correct, 93k ohms?
                              Is it a fusible resistor?
                              Lastly, how do I know what wattage?...
                              05-14-2025, 06:42 PM
                            • electron_jj
                              Panasonic TH-L42D25A checking the PSU output voltage
                              by electron_jj
                              Hi Everyone, I am new to this forum. I have a Panasonic LED TV which doesnt turn on and is blinking 4 times repeatedly when I turn on the switch. The TV does not respond to the remote control so I had to turn on using the physical switch on the side of the TV. When I turn on the switch the 4 x blinking starts and repeat itself until I turn off the TV. There is a black screen. I turned off the light in the room to check the panel and I think there is no backlight as far as I can tell.

                              I have been inspecting and testing the capacitors and diodes in the power supply board to try to...
                              08-29-2021, 08:13 AM
                            • cloo
                              Panasonic ZT60 plasma tv with strange behavior and 8 blink code
                              by cloo
                              I recently got my hands on a 60" Panasonic P60ZT60 plasma tv (european model) that has some strange issues along with an 8 blink code.
                              It know this tv is getting old but it was once considered one of the best plasmas ever made, and i think it is still holds on to that even by todays standards.


                              So, long story short. When i first got the tv it had a very bright washed out picture with very raised blacks in all picture modes and i couldn't find the cause in the picture setting menus.
                              After doing a factory reset this problem was gone and the picture was back to...
                              01-06-2025, 06:02 AM
                            • x_orange90_x
                              Samsung UN55KU6300F no standby voltage
                              by x_orange90_x
                              I have no standby indicator light and no light on the optical port. I checked the standby voltage on the two mosfets in the top left and they both read 30mV. I checked the fuse and it has continuity. I also checked the voltage on the two large 450v caps they both read 153v. All of these voltages are the same with and without the main board connected as well as with backlights connected/disconnected.

                              Nothing looks obvious like a burned ceramic disc cap or bulged electrolytic. No burned resistors, diodes, or anything like that....
                              05-21-2025, 09:59 PM
                            • Loading...
                            • No more items.
                            Working...