have backlight on Visio vx 42L that stays on anbd unit doesnt power off. There is no video have 5 and 12 volts at fuses on main bd or signal bd p/n 3642-0252-0150. looking to repair if any answers thanks
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Re: visio vx42l
@Greggtech - looks like we all missed this one - are we too latePlease upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740 -
Re: visio vx42l
Well just in case it isn't and or for future viewers, this is going to be a main board issue. If you can get the tv to turn on but then stops responding and won't turn back off that is going to be a bad main almost every time when dealing with vizio models.Comment
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I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection... -
Hi and thanks in advance for any input you might provide!
I have a Sceptre U550CV-UMRD8POTV83BB 4K LED (this is a dumb tv) that I bought new in August 2021, so It's just completed 3 years.
Main power board model: TP.MS3683.PC821 T-Con board: N4TP546UHDPU2L_BO
Last Sunday I was watching a dvd and fell asleep for about half hour, when I awoke the tv screen was black and couldn't get the dvd menu to show, so I changed the input to antenna and had sound but no picture, turned it off. I then got online and found this great site! ....read many troubleshooting tips and this... -
Hi everyone,
I’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).
🧩 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 -
Hi everyone,
Im looking for some advice regarding my Samsung UE55MU8000 TV with main board model BN94-11606C. The TV suddenly stopped turning on and now shows no signs of life at all not even the standby light at the bottom.
Initially, I suspected an issue with the PSU, so I took it to a repair center. They tested it and confirmed that the PSU works perfectly, even on other TVs. Based on that, I started investigating the main board.
I disconnected the main board from the PSU, and the backlight turned on, which seems to confirm the main board is the issue.... -
Hello everyone,
I’m currently troubleshooting an issue on my Lenovo ThinkPad T470p (Type 20J6) and would really appreciate any insights or solutions.
Issue summary:
Whenever I remove the main laptop battery and AC adaptor, then place them back, the system gives a “CMOS checksum error” at next boot, and the BIOS clock resets to its default time/date.
However, the RTC works fine as long as the main battery remains attached — even if the laptop is unplugged for hours. Same as I remove the battery while the AC is attached, RTC remains. Obviously,...
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