Hitachi L32S504 - Dead, No Power, No LED light

Collapse
X
Collapse
 
  • Page of 2
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • ryanfan03
    Member
    • Apr 2014
    • 45
    • United States
    #21
    Re: Hitachi L32S504 - Dead, No Power, No LED light

    Yes. Tv was unplugged. This just gets weirder by the second I guess. I have to find the schematic to get the value of that cap. Unless I can find a good pic of the board on eBay or shopjimmy. Is there anything else I can check before either replacing the two parts or breaking down and buy a new board? This is now very intriguing to me and I want to find the problem. My luck it's probably the microprocessor or something and all this will be for naught.
    Doing this on the side to make some extra money for my daughters dance competition.

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA
        #22
        Re: Hitachi L32S504 - Dead, No Power, No LED light

        OK, so right now the pad (input pin) of that IC which the leg is no longer there shows < 1 Ohms? If that is the case you will have to find out where the shorts is at at this point. You will need to trace out that trace to see where it goes and what other components are connected to that input pad, it is not going to be easy since that input Voltage can have lots of connections.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • ryanfan03
            Member
            • Apr 2014
            • 45
            • United States
            #23
            Re: Hitachi L32S504 - Dead, No Power, No LED light

            Sounds like a fun challenge. I will trudge along these next few days and see what I can come up with. Thanks for all your help so far.
            Doing this on the side to make some extra money for my daughters dance competition.

              Comment

              • Spork Schivago
                Badcaps Legend
                • Mar 2012
                • 4734
                • United States of America
                #24
                Re: Hitachi L32S504 - Dead, No Power, No LED light

                I don't know if this would help or not, but I did find a service manual for the Hitachi L42S504, not the L32S504. The main board looks very similar, from what I can tell. Also, my broken Insigna, which is a 42", is almost identical to your board, minus U702. U702 on my board is next to U703. I'm having similar problems with my board too. Maybe you can use this service manual to figure out what the value should be of the capacitor that's missing. Hope it helps and good luck.
                Attached Files
                -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                  Comment

                  • Spork Schivago
                    Badcaps Legend
                    • Mar 2012
                    • 4734
                    • United States of America
                    #25
                    Re: Hitachi L32S504 - Dead, No Power, No LED light

                    I don't know if you're still working on this or not, but I believe I figured out what was wrong with my board, it was U505. It very well could be the same problem with yours. The reason I think this is because the voltage regulator on your board that reads around 0 Ohm against ground for both input and output pins. With the regulator removed, on my board, they both read around 0 ohm. The input pin is 3V3STB and the Output pin is 1V8STB. The only place I could find in the schematics where the two met was U505. Just a thought.
                    -- Law of Expanding Memory: Applications Will Also Expand Until RAM Is Full

                      Comment

                      Previous 1 2 template Next

                      Related Topics

                      Collapse
                      • ygorsan
                        LG 55NANO77SRA TV ā€“ Menu scrolling by itself even after removing button board (Main Board EBU66792103)
                        by ygorsan
                        Hi everyone,




                        Iā€™m looking for help with a persistent issue on an LG TV model 55NANO77SRA, which uses the main board EBU66792103 (also used in LG UQ80 and NANO75/NANO80 series).







                        šŸ§© Problem Summary:
                        • The TV keeps scrolling through the menu or selecting items by itself.
                        • I removed the physical button board (the entire panel with power and volume buttons) and also disconnected the flat cable (CN202) from the main board.
                        • The remote control is not in use (batteries removed), and the TV still shows the same behavior.
                        • I
                        ...
                        07-28-2025, 08:34 AM
                      • JDC
                        (SOLVED) - ONN 100012588 No Power, Then Rebooting After Main Board Change
                        by JDC
                        ONN 100012588
                        Issue: No Power, Then Rebooting After Main Board Change

                        Short answer: replace main board and power board
                        Technical answer: replace main board and Q306 & Q307 on power board.

                        Long answer:

                        TV wouldn't turn on. Power switch was fine which means the main board isn't processing the power on signal. Replaced main board. TV turns on now but randomly reboots. Bad main board? EEPROM? Tried to pull main board and got a shock touching the corner of the board. That's weird. C334 (450V 10uf) capacitor is still holding a high charge....
                        07-15-2022, 07:39 AM
                      • howardc64
                        A1312 (27ā€ iMac 2009-2011) A1407 (Thunderbolt Display) A1316 (Cinema Display) Display Black Screen Repair
                        by howardc64
                        Problem

                        This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
                        08-04-2024, 10:36 PM
                      • advant
                        Driving a Sharp TCON/panel with a universal main board
                        by advant
                        This thread is about trying to get an Universal Main Board to work with a Sharp TCON and panel.

                        I have a Sharp LC-46D85UN TV that has had a main board issue. Since this model is from 2009, I am not able to find an exact replacement of the main board. Instead, I decided to see if I can future proof this tv by getting a Universal Main Board (T53U21.2) from China to work with the Sharp TCON (CPWBX4291TPZA) and panel. The universal main board supports a 8 bit dual channel LVDS interface whereas the TCON requires a 10 bit dual channel LVDS input. I have modded the LVDS connector to match...
                        02-03-2020, 12:25 AM
                      • dokma
                        Samsung 50" plasma PS50Q97 with a dead main board
                        by dokma
                        Hello forum!

                        This is my fourth post so I will try to start on the right foot by doing it properly right off the bat. I bought this plasma faulty to play around with. The main board is completely burnt. When I unplug everything but the power supply and the main board and I plug in the power chord I get plenty of smoke from the main board.

                        Now, the model of the TV is a bit of a detective work. I couldn't find the model of the TV anywhere on the back cover or inside so I deduced it from the main board codes. SO I THINK this is PS50Q97.

                        Now, since the board is...
                        07-05-2020, 07:52 AM
                      • Loading...
                      • No more items.
                      Working...