Set is in standby and wont power up. In standby I get 5.02V on 5VSB and the rest of the pins are 0V. If Short PS-ON to GND with a 1K resistor I still get nothing. Anyone have history with these sets? Common issues. A quick google didn't turn up much in the way of Youtube repair tutorials. No burn marks on front or back of the power board or main board. I also don't have a remote so hoping its not just a power button issue but the lack of voltage on 12v or the other 5v pins is leading me to power board problems.
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You need to connect 5VSB (5v) through a 1kOm resistor to PS-ON, then the power supply will start.
And the fact that it does not turn on (does not go into operating mode) is likely that the firmware is damaged.Last edited by lotas; 08-19-2024, 07:30 PM. -
Thanks Lotas! I just did that and have all 12v and 5v. However there was an unused 24v pin on a different part of the board and I probed that and it only has 18v on it. Not sure if its important as it doesn't have a connector soldered to it and its not being used. I do see that 18v jump to 19.2v in unison to a faint tick I can hear from the board. - This is all being done with the mainboard disconnected.Comment
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I was wondering if it would cause any damage to have the Main board plugged with the resistor still jumpering between PS-ON to 5VSB? Right now I just have the PS board running with the resistor and main board unplugged.Comment
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It's better not to take risks, and what will this give if your motherboard is not working correctly...
What is the number of your motherboard, what is the processor on it?Last edited by lotas; 08-20-2024, 03:59 PM.Comment
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Main Board RCA RE010C878LNA1-B1 {{Location U16: EEPROM: ah1313 25032bsig e50842}}Comment
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Im Not familiar enough to identify what IC is the processor But i See [ITE IT6633E-P 1311-CX0 VC0ALB] and [WINBOND W9751G6KB-25 63035V900ZY2 315HUA]. Unless its the chip under the heat sink.Comment
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You have a programmer to read dump from 25Q32, if you have an MStar processor, then you may be able to restore your dump if the problem is there.Comment
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According to the photo on the Internet, you have a processor under the heatsink. Do not tear it off (heatsink), otherwise you will damage the processor.
As I understand it, your motherboard (chassis) is T.RSC8.78, and it has a non-MStar processor, so I won’t be able to restore it..Last edited by lotas; 08-20-2024, 04:48 PM.Comment
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I received a replacement main board today and installed it with the same results. I suppose its possible the main board i got was also defective. any other tests that might narrow this down?Comment
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Have you checked the button board to see how they work with a multimeter, maybe some button has a short circuit (has a leak inside) and, accordingly, others will not work..Comment
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Thanks Lotas,
It was the button control board, the power button was stuck. After disconnecting it and shorting the pins that would go to Power momentarily the set powered right on. I went back and checked my original main board, it was also good. Now I have a spare! I cleaned the button board and it's working again. Glad to have the TV back up and running. Thanks again!
Early in troubleshooting I tried to short the GND and Power button pins but still had the button board connected, thanks for pointing out that one of them could be stuck and blocking functionality of the others.
Much appreciated
If anyone was curious I tried a RE010C878LNA-A1 main board instead of a RE010C878LNA-B1 and it still worked just fine. Shop Jimmy says they are different but they both worked with my hardware.
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It looks like the B1 has connections and other components for an internal dvd player they are missing on the A1 boardLast edited by R_J; 08-26-2024, 09:06 PM.Comment
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The A1 Board I got had all the same connection points the B1 board had. Granted i didn't switch inputs to the internal DVD and test but it did have a spot for me to plug in the cable.
Here's the board I picked up: https://www.ebay.com/itm/156339499551 Note the "DVD Signal" just behind the component barrels.Comment
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Hi There,
This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.
After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.
More Details
TV Model - LG OLED77G1PUA
Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt... -
Hey guys great forum glad to have found it. I bought a Sony XBR 65X900C cheaply because it didn't work. No signs of life at all not even a light/led. All I hear is a brief high voltage sound when I throw the power to it.
Didn't see any obvious signs of damage so right away started checking voltages. This is what I see:
Power Board Connector that goes to Main board
CN6401
Pin 01 NC
Pin 02 NC
Pin 03 "BL_ON": 0V
Pin 04 "N/C"
Pin 05 "STBY 3.3V": 3.5V
Pin 06 "GND": N/C
Pin 07 "AC_OFF"... -
I have a Panasonic TC-P54VT25 that will power on and prime the display but there is no image at all.
The panel is primed as there is a slight glow from the entire panel. This means the problem should be logic related. The service manual also confirms this and recommends replacing the A or the D board.
I have tried to get the TV to display the test sequence but I have been unable to and I don't even know if this TV has a test sequence or not. I tried following tom66's instructions in post #3 on this thread https://www.badcaps.net/forum/showthread.php?t=26790. There was... -
Hello!
I have been trying to solve this issue the past 12 months to no avail. I have been a lurker here during that time but finally decided to post my problem and see if anybody knows a solution.
Problem
My tv (OLED55CXPUA) has an issue where it displays horizonal lines of dotted artifacts.
(See Attachment 1)
Self Diagnosing
After a very long troubleshooting period I traced the issue to the T-Con board. If I gently flexed/bend the board I could make the display go from GOOD to BAD and vice versa. I have ruled out the connectors/wires... -
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....
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