LG Led TV 32LN5300UB Completely Dead

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • ivtec
    Badcaps Legend
    • Dec 2008
    • 1967
    • USA
    #1

    LG Led TV 32LN5300UB Completely Dead

    Hi guys i found the Lg tv in the curve completely dead, checked power Supply board and no voltages anywhere,no volts in the primary side or secondary side,no volts 3.5v,24v,12v,i checked mosfet q101 and is good,fuses are all good also checked all components that i could check with my fluke and cap analyzer and all seems to be in order,so it seems to be a mystery . Any help will be appreciated to save this tv from landfill.
    Attached Files
    Last edited by ivtec; 07-09-2021, 02:41 PM.
    Tags: None
    • ivtec
      Badcaps Legend
      • Dec 2008
      • 1967
      • USA
      #2
      Re: LG Led TV 32LN5300UB Completely Dead

      Also i get 87v only 'see attachment pic

        Comment

        • ivtec
          Badcaps Legend
          • Dec 2008
          • 1967
          • USA
          #3
          Re: LG Led TV 32LN5300UB Completely Dead

          Also i only see 87v from AC input to fuse?
          Attached Files

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9535
              • Canada
              #4
              Re: LG Led TV 32LN5300UB Completely Dead

              What was the meter set to? AC or DC? Looking at your last picture you are checking the voltage between the fuse and ground. You need to check the AC voltage across Line and Neutral. Not Line and Ground

              Just check the DC voltage ACROSS the main filter capacitor. It should be 160vDC. Then with the board un plugged from ac, check the resistance of R113, it should be about 0.15Ω
              When checking voltages in the Primary, you must reference HOT Ground (C110 negative leg)
              Last edited by R_J; 07-09-2021, 09:54 PM.

                Comment

                • ivtec
                  Badcaps Legend
                  • Dec 2008
                  • 1967
                  • USA
                  #5
                  Re: LG Led TV 32LN5300UB Completely Dead

                  Originally posted by R_J
                  What was the meter set to? AC or DC? Looking at your last picture you are checking the voltage between the fuse and ground. You need to check the AC voltage across Line and Neutral. Not Line and Ground

                  Just check the DC voltage ACROSS the main filter capacitor. It should be 160vDC. Then with the board un plugged from ac, check the resistance of R113, it should be about 0.15Ω
                  When checking voltages in the Primary, you must reference HOT Ground (C110 negative leg)
                  Thanks R_J for correcting me, long time i do not repair anything and getting old and forgetting ; Ac Line and Neutral =122v AC, Neutral and fuse=122v Ac, across filter Cap C110=169v Dc. Resistance across R113=0.4ohms, appreciate your help.I took all those voltages without Power supply being connected to main board and panel?
                  Last edited by ivtec; 07-10-2021, 12:17 PM.

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada
                      #6
                      Re: LG Led TV 32LN5300UB Completely Dead

                      Are you sure you don't have 3.5v on the secondary side?

                        Comment

                        • ivtec
                          Badcaps Legend
                          • Dec 2008
                          • 1967
                          • USA
                          #7
                          Re: LG Led TV 32LN5300UB Completely Dead

                          Originally posted by R_J
                          Are you sure you don't have 3.5v on the secondary side?
                          hI R_J you are not believe it,i picked up this tv from the curve and it had no power cord ,but i had 3 cords in my scrap and took one to the cellar where i have the tv ,but the cord was bad ,the volts i gave you were taken with just power board connected with another cord ,i took this good cord to the celler and now when i connect the cord it goes to standby with red led ,when i power it up it gets a high loud sound from the tuner i guess, but with no display back light, and i tested volts going to the main i get the 3,5v, 12, 24v,i think the main board is bad!
                          Last edited by ivtec; 07-10-2021, 04:06 PM.

                            Comment

                            Previous template Next

                            Related Topics

                            Collapse
                            • max-power
                              Dell E6540 laptop completely dead after dssasembly
                              by max-power
                              Hi, I disassemble my laptop to replace the speakers, to access them, you have to remove everything including the heat sink and fan, unscrew the motherboard, lift it up a bit to access the speaker wire.
                              that was not the first time I dissasemble it, i did replace the same speaker a few year ago and I repaste it last year, so I had nothing to worry about. but when I put everything back together, its completely dead.

                              After a bit of investigating, i found one pin of the status led ribbon cable that was unglued from the cable and bend touching another pin, I bend it back at his place...
                              03-24-2025, 08:49 AM
                            • BTubbs200
                              Dead Dell Latitude 5420 not receiving 20 volts from USB-C charger
                              by BTubbs200
                              Hello,

                              Dell Latitude 5420 P137G
                              Board: LA-K491P REV A01

                              I have received this laptop which was described as "does not power on or accept charge." Battery shows no sign of charging when charger is plugged in, nor does the board show any signs of life when battery is unplugged and charger is plugged in. No light from the LED at all or any other indications of activity.

                              Board seems to have no shorts, all power rails are fine and show high resistance.

                              When charger is plugged in, voltage is present in 3.3V rail but absent in others....
                              01-24-2025, 08:15 PM
                            • wangbreeze
                              T480s random shutoff and then completely dead
                              by wangbreeze
                              Hello Gurus,

                              I got a ThinkPad T480s. It was running fine but suddenly started random shut down. When it turned off, I had to push the reset pin to bring it back to life. But it got aggressively worse and became completely dead. No charging light, no life.

                              I did some initial diagnostics with just the board (no battery, nothing attached, and no CMOS battery as well)

                              Initial testing of the coil resistance seems to indicate no dead short. The only low resistance I measured was at PL701. It reads 38 ohms.
                              charger gave - 20V - ok

                              U101B
                              ...
                              02-03-2024, 04:57 PM
                            • Superbee_dad
                              Sharp 80” long short flash backlight error - Help
                              by Superbee_dad
                              Hello Sharp TV experts
                              Our Sharp LC-80LE642U displays one short one long flash error code which is a backlight error. I went into service mode and there were 8 lamp error counts recorded. I reset the count to 0 and did a reset. The last monitor error cause was 16 B00014639:12. 16 is the code for backlight error. I tried to power the tv up but went back into error mode.

                              > I checked voltages on the power supply board and they all check out .. including 3.28 volts at the error pin.
                              > There is power to the cpu and T-CONN and no faults found there. The cpu has a flashing...
                              01-24-2025, 11:51 PM
                            • Loretto
                              Samsung SMPS BN44-00339A
                              by Loretto
                              Hi all,
                              this unit comes from a samsumg LCD TV LE32C530F1W which stopped working after making a strong noise like something was exploded inside of it.
                              I opened it and found that fuse FP801S was blown, capacitor CP814 was completely disintegrated and MOSFET QP801S was shorted.
                              I replaced all of them and instead of the fuse I connected a 100 Watt bulb. Then, without connecting it to other TV boards, I switched it on, but the bulb begun to blink.
                              I thought that maybe the bulb was somehow interfering with the normal operation of the power supply, so I replaced it with a fuse,...
                              03-29-2025, 08:30 AM
                            • Loading...
                            • No more items.
                            Working...