So here is the problem. I have a LG 50PA5500 that took a power surge through the HDMI port. It would not power up or anything. I replaced the power board and still had nothing. So i disconnected all cables coming off the power board. When i plugged in to power i heard a click and herd some humming(good sound I hope). I then proceeded to plug in the cable that was near the slot labeled VATP on the power board all went well still have power. As soon as I plug in the cable going to the main board pt #EBT 62145301(where the HDMI ports are at) I loose power. With that being said do I have a bad main board too? I know when i check voltage i do have it at the cable that plugs into the main board.
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Re: LG 50PA5500 NO power
If you had power surge through hdmi then you will have damaged main board.I assume no responsibility for any stupid suggestions I might post. -
Re: LG 50PA5500 NO power
Follow up. I have replaced power board(which gave me power finally, and replaced main board which has given me standby by power and ability to turn off and on, however i still have no picture. When I turn unit on i see a quick flash of the screen then nothing total blackness. Any ideas would be nice.Comment
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Re: LG 50PA5500 NO power
Can you see some points on the control board (middle green board) marked EXT AUTO GEN
Put a wire link between these then disconnect the cable between the control board and the main board
If you see test patterns, the main board is probably at fault
If not, something else is wrong.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
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Re: LG 50PA5500 NO power
ooohhhhh pretty colors and movement. That worked I have a test pattern but I just replaced the main board, the original main board did not even allow a power up. Could the y sus or z sus be bad? Damn lightning did some damage. Thanks for the help tom66Last edited by lajabba1985; 07-01-2017, 01:31 PM.Comment
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Re: LG 50PA5500 NO power
No since you got test patterns everything except the main board is good. I'm assuming all the colours looked good with no obvious distortion/etc.
You got a bad main board, so send it back to the seller and ask for a refund/replacement.
All too common for people to buy faulty boards and replace the wrong things.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
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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... -
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.... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
[HELP] Acer AN515-55 (LA-J871P Rev: 1B) – Board won't power on after GPU investigation – Suspecting Super I/O or PCH
Hi everyone,
I'm working on an Acer Nitro 5 unit with the following specs:- Motherboard: LA-J871P Rev: 1B
- Model: Acer AN515-55-59MT
- S/N: NHQ7JAL00403906A973400
- SNID: 03902728734
Initial Issue
The laptop initially presented graphic issues and driver failure (Code 43) for the GPU.
After preventive maintenance (cleaning, thermal paste, etc.), it powered on normally. We disassembled it again to inspect the GPU, reassembled... -
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...
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