Re: RCA 42PA30RQ abnormality
Ok lets get some pics of the boards so we can see the component labels
Ok lets get some pics of the boards so we can see the component labels
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Re: RCA 42PA30RQ abnormality
Of the E and F buffers?Comment
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Re: RCA 42PA30RQ abnormality
yesComment
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Re: RCA 42PA30RQ abnormality
Here are the pictures. I hope this is what you are looking for..Attached FilesComment
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Re: RCA 42PA30RQ abnormality
The pictures uploaded out of order but it's still grouped according to each boardComment
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Re: RCA 42PA30RQ abnormality
There's a fuse on the buffer board marked F5a. With power off, check the resistance. Then with power on, check voltage from each end to chassis ground. Expecting around 50~60V.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: RCA 42PA30RQ abnormality
Should I test the fuse with the Y buffer removed so that it doesn't go into safe mode to ensure that everything is getting voltage?Comment
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Re: RCA 42PA30RQ abnormality
I thought you had screen glow? Or is that disappearing?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: RCA 42PA30RQ abnormality
It glows at the start with a little multicolored static then goes into safe mode with the Y buffer connected. If I disconnect the Y buffer it will not go into safe mode.
Edit: By at the start I mean when I first power the unit on.Comment
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Re: RCA 42PA30RQ abnormality
Check the voltage on both ends. Leave the continuity test for now. I suspect the Y-buffer is bad. Have you checked the Vsc voltage?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: RCA 42PA30RQ abnormality
I have a new Y buffer it came in today. There's no voltage at the Vscan with the Y buffer disconnected.
Edit: I just located the fuse "F5r" 55.2v at both endsLast edited by Maushinator; 12-24-2013, 03:03 PM.Comment
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Re: RCA 42PA30RQ abnormality
If no Vscan with or without Y-buffer, the Y-main is bad or potentially X-main if Ve is shorted (-Vsc and Ve generated on same transformer so overload on either causes issues.)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: RCA 42PA30RQ abnormality
I'm getting voltage at the VE 98.4vdcComment
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Re: RCA 42PA30RQ abnormality
Can you show where you are testing Vsc?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: RCA 42PA30RQ abnormality
At this test point on the Y main.Attached FilesComment
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Re: RCA 42PA30RQ abnormality
Wait is the VScan supposed to read a negative voltage? I thought something was wrong with my meter.. VScan is at -194.4Comment
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Re: RCA 42PA30RQ abnormality
That is correct then. If it's shutting down it will be due to a fault in either the X-main, Y-main or Y-buffer. Is the indicator on the control board going 2 sec on, 5 sec off?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: RCA 42PA30RQ abnormality
Yes then LED flashes 5 seconds on and 2 off except when I removed the Y buffer it then flashes the normal once a second.Comment
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Re: RCA 42PA30RQ abnormality
The X main becomes pretty warm with the unit on I was assuming that's normal? The Y main stays cold.
Edit: That is with the Y buffer disconnected so that everything else receives power.Last edited by Maushinator; 12-24-2013, 04:01 PM.Comment
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Re: RCA 42PA30RQ abnormality
Is -Vsc dropping out with buffer installed?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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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,
Iām 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).
š§© 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.... -
Hoping someone here could possibly help. I have a few questions in regards to compatibility with main boards. But I'll give a quick short run down on what's going on first;
I have Samsung Smart TV UA65MU6100WXXY version DA01
Now years ago it started intermittently playing up after a lighting strike. Lighting hit the block of units i was living in at the time. Ever since that night the TV started having a mind of its own, It would randomly turn itself off or on, and all inputs stopped responding like HDMI, aerial, but USB still worked. Anyway, over the next few months...
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