Panasonic TX-P50GT30E plasma TV failed Y-sus board
Good day folks. Got a pretty big (literally) project on my hands here, which I believe I'm on the path of fixing, but of course I'd like to share my discoveries with you and hopefully get some tips as well. This big beast has a dead Y-sus board (TNPA5335) which is a common fault on these Panasonics, signaled by the 7 red blinks of the LED when you attempt to power it on. I took the back cover off and was immediately greeted with the worst case of dust buildup I've ever seen in a TV so far (check the photos). It had actually gone beyond what would be called "dust" - it was more like soil or mud which had a brown color, hinting the set is used in a smoking environment, presumably a bar or a pub, also confirmed by the tobacco scent...anyway.
The actual problem comes down to some dead IGBTs on the Y-sus board, which I might be able to source, however I'm worried that they might blow again, since the repair videos and kits also provide a few other smaller parts, namely the two ICs I took a picture of up close (my good ol' Galaxy S3 and a couple of magnifiers make a pretty cool microscope, wouldn't you say ?
). Check out the schematic I found for this board: the ICs in question which everybody seems to replace are IC502 and Q531, which in the schematic for some reason are labeled as IC16502 and Q16531 - I could not find anything about these things, what they are and what they do. As far as I can make out from the schematic, the Q531 is a double PNP-NPN transistor, however what it does and what it controls is a little over my head. The other IC I have no idea what it could be - it obviously does some control of that transistor, but I could not find an exact datasheet or part number. The thing is, neither of these two smaller parts appear to be bad, or at least the multimeter didn't signal any shorts - the functionality of the parts might have been affected :| So, does anybody know what these two ICs are and whether or not I should replace them ? Cheers.
The actual problem comes down to some dead IGBTs on the Y-sus board, which I might be able to source, however I'm worried that they might blow again, since the repair videos and kits also provide a few other smaller parts, namely the two ICs I took a picture of up close (my good ol' Galaxy S3 and a couple of magnifiers make a pretty cool microscope, wouldn't you say ?
). Check out the schematic I found for this board: the ICs in question which everybody seems to replace are IC502 and Q531, which in the schematic for some reason are labeled as IC16502 and Q16531 - I could not find anything about these things, what they are and what they do. As far as I can make out from the schematic, the Q531 is a double PNP-NPN transistor, however what it does and what it controls is a little over my head. The other IC I have no idea what it could be - it obviously does some control of that transistor, but I could not find an exact datasheet or part number. The thing is, neither of these two smaller parts appear to be bad, or at least the multimeter didn't signal any shorts - the functionality of the parts might have been affected :| So, does anybody know what these two ICs are and whether or not I should replace them ? Cheers.
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