Samsung ue40d5003 BN41-01702A dead
Good day folks. Time for another entry into the "I don't know what that is and there's no schematic" category: got this Samsung TV which has both a faulty main board AND a faulty power supply. I believe the issues may be related. The power supply turns on and off intermittently, but let's leave that aside for now, since I fist wanted to make sure the TV still works before I spend hours repairing it's PSU only to discover the main board is dead....and I believe it is. I tested it with a functional power supply from a similar TV and the LED doesn't even come on, but something makes a repeated ticking sound rather quickly.
Someone, before me, has been in this TV and did a repair job on this board, as I immediately noticed some components had been replaced and they didn't bother to clean the flux off of them. There's a 4801A transistor close to the power connector which I thought had a tiny puncture in it (see the picture), but doesn't read any shorts, so I believe is fine. The other is an ATMEL chip of sorts...I have no idea why they'd replace that, even if it had firmware issues, the SPI chip is further down so they would've gone for that instead...all well. Not being able to find a schematic, I tried following along on my own as much as I could and traced the A5v pin to the small SOT IC in the picture - IC202, a voltage regulator I assume, with 9010F on it....couldn't find anything about this either.
A dead CPU would still allow the LED to turn on, but this one does nothing, so my guess is that this last IC is faulty....I don't suppose anybody has a schematic or anything, so this is more to share my findings with people who might have ran into this issue before or MAY do so in the future. As always, any thoughts are welcome. Cheers.
Someone, before me, has been in this TV and did a repair job on this board, as I immediately noticed some components had been replaced and they didn't bother to clean the flux off of them. There's a 4801A transistor close to the power connector which I thought had a tiny puncture in it (see the picture), but doesn't read any shorts, so I believe is fine. The other is an ATMEL chip of sorts...I have no idea why they'd replace that, even if it had firmware issues, the SPI chip is further down so they would've gone for that instead...all well. Not being able to find a schematic, I tried following along on my own as much as I could and traced the A5v pin to the small SOT IC in the picture - IC202, a voltage regulator I assume, with 9010F on it....couldn't find anything about this either.
A dead CPU would still allow the LED to turn on, but this one does nothing, so my guess is that this last IC is faulty....I don't suppose anybody has a schematic or anything, so this is more to share my findings with people who might have ran into this issue before or MAY do so in the future. As always, any thoughts are welcome. Cheers.
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