Hi guys, I hope you can help me out with your experience.
I have this wonderful Samsung 4K TV that shows a solid red light when connected to power (standby, I guess), but refuses to turn on. When I press the physical button to turn the TV on (on the back), it does nothing. So I opened it and try some tests. So far I have checked:
- That the button works properly.
- That the backlight turns on if I disconnect the main board from the power supply.
- That the power supply board (a BN44-00755A) gives the right output without load on the CNm803 connector (the one that links to the main board). I used this posts to find out the voltages:
https://www.badcaps.net/forum/showth...ght=un55hu6840
where user @2smoovedaddy kindly put the expected output in a post.
- I took the repair guide from a russian page and began the troubleshooting for "no power" (see attached pic). I get:
BD213 --> Fine (~5V)
BD200-208 --> Fine (~12.8V)
BD228 --> Wrong (gives ~0V)
Of course, the power output of the main board in the next step is all screwed up. IC209 is fine, but the rest are totally wrong.
So I try to find a short in BD228, but I don't see anything. At this point I think the power supply is broken, and although the output is right without any load, that's not very meaningful, and under load doesn't work very well.
But there are a couple of things that make me be suspicious:
- BD228 is connected to BLU_ON on the power supply, which is 3.13V (no load) according to the aforementioned post. Why should I expect 5V there (according to the repair guide)?.
- The power output of the main board is totally wrong. I would expect a few things to go fine with solid 13V input, but I'm wild guessing here and I can be completely wrong.
Can you give me an advice?
I have this wonderful Samsung 4K TV that shows a solid red light when connected to power (standby, I guess), but refuses to turn on. When I press the physical button to turn the TV on (on the back), it does nothing. So I opened it and try some tests. So far I have checked:
- That the button works properly.
- That the backlight turns on if I disconnect the main board from the power supply.
- That the power supply board (a BN44-00755A) gives the right output without load on the CNm803 connector (the one that links to the main board). I used this posts to find out the voltages:
https://www.badcaps.net/forum/showth...ght=un55hu6840
where user @2smoovedaddy kindly put the expected output in a post.
- I took the repair guide from a russian page and began the troubleshooting for "no power" (see attached pic). I get:
BD213 --> Fine (~5V)
BD200-208 --> Fine (~12.8V)
BD228 --> Wrong (gives ~0V)
Of course, the power output of the main board in the next step is all screwed up. IC209 is fine, but the rest are totally wrong.
So I try to find a short in BD228, but I don't see anything. At this point I think the power supply is broken, and although the output is right without any load, that's not very meaningful, and under load doesn't work very well.
But there are a couple of things that make me be suspicious:
- BD228 is connected to BLU_ON on the power supply, which is 3.13V (no load) according to the aforementioned post. Why should I expect 5V there (according to the repair guide)?.
- The power output of the main board is totally wrong. I would expect a few things to go fine with solid 13V input, but I'm wild guessing here and I can be completely wrong.
Can you give me an advice?
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