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Re: xr-55x90j power issue
@diah I did the test, added ground pin to tcon for safety and screen goes white green blue red. Panel is okay. BL come on all is well. So tcon and panel are good, LED driver good.
Leaves psu and main.
Clearly PSU won't supply 12v to tcon and that's an issue. Gonna reread everything first and look at this fresh tomorrow.
@lotas, I thought the same thing with main board. But tcon 12v throwing me off. PSU seems to supple tcon 12v and I cannot force 12v on it so I'm interested in why. But I also thought main was cause also. We will see soon.
At least panel and tcon are good! Yay!
Also to add to first post, it appears the .178 is not being supplied to tcon from main board but is the voltage from PSU to tcon. Whatever voltage coming from PSU to tcon is the voltage the tcon gets at the fuse
Edit: not sure if measuring with ground to chassis means anything but one side octocoupler reads 10.37other 9.33. just throwing that data here.
I also tried freezing it as the video I saw showed and no change, same voltages.Last edited by EazyBone; 11-09-2023, 09:57 PM.Comment
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Re: xr-55x90j power issue
Your T-con 12 volts comes from the REG12V and is switched by U6? (can't make out the number) mosfet on the power supply to provide the TCON_12V, are you getting the TCON_ON voltage (CN6401, Pin 26) from the main board?Last edited by R_J; 11-09-2023, 10:27 PM.Comment
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Re: xr-55x90j power issue
good news, but now you need to take out the PSU amd leave it always standalone on the table with primary jumper connect BTW STB-PW-On & STB -T-CON12ON
upload high resolution Photo of the TOP & down side to help us read the diagram of the T-COn 12 circuit.. its easy task now
i wrote to take it out... in-order don't plug the MB to it.... we don't want any damage could happen to MB if there short at the circuit on PSUComment
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I don't understand what's going on, badcaps has changed it's entire setup for me and replies are gone, like everything is messed up for meComment
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It’s just that after changing the engine and interface, the latest messages were not saved and personal messages disappeared!Comment
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Well that's sucks. I personally don't like this new interface. Old one was amazing this one is just unfriendly.Comment
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Well this was main board issue. TCON on through power board alone will not turn on 12v for this model alone without MB I guess. Fixed!Comment
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But apart from these 12 volts, there was no indication, no backlight, no sound, although the power supply supplied 12 V to the motherboard.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... -
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... -
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.... -
My Oled Tv is 55inch tv, 3 days ago I notice that middle of the screen is getting warmer and on picture I have ghosting, missing red color. Color red was still displaying, but it was not so strong as corners of the screen and watching some movies makes me angry.
Then I get an idea to take it apart and clean boards from dust.
In side of Tv was not so bad, I take compressed air in can, and gently blow up.
Also I was thinking to styrofoam sponge to isolate power board from screen that the middle of the screen will not worm so much. Because Led on screen when gets higher... -
Hi All,
Need help.
I have a samsung un60j620dafxza led tv. When I plug it in it has no display, no sounds, and no standby lights.
So I opened the tv and disconnected the power to the mainboard and the backlight powered up. This according to many people says that this is a mainboard
problem. I checked the voltage coming from the stb and I read 1.3 volts on pins 1,3,5 and 7 which are low volts instead of 13 volts which i think the lcd panel
might be drawing too much power from the power supply that it prevents the right voltage going to the mainboard....
Comment