Just got this Philips plasma, said to have "turn on blue led light, but no picture". Thought -- Y-sustain and Y buffers. Plugged in the power cord, and saw a huge spark through the case and something blowing on the power supply. And Finally opened it up and here's what I found.
Well first thing I tested the Y-sustain and Buffers. Buffers ohm out good, no shorts on either one. Tested the obvious FETs on the sustain, and no dead shorts either! So the Y boards seem to be good in this case.
On to the power supply. No obvious burnt marking on the PSU at all... but there was a small burnt mark it left behind the panel where the main caps are. I desoldered both caps (450V 270uf) and sure enough both are bad and one is literally exploded from the bottom while burning the board. I also found one shorted diode next to those caps D8020.
After cleaning up the burnt, the traces are obviously damaged. To fix this I wanted to make sure, my question is, were traces connected together?
Well first thing I tested the Y-sustain and Buffers. Buffers ohm out good, no shorts on either one. Tested the obvious FETs on the sustain, and no dead shorts either! So the Y boards seem to be good in this case.
On to the power supply. No obvious burnt marking on the PSU at all... but there was a small burnt mark it left behind the panel where the main caps are. I desoldered both caps (450V 270uf) and sure enough both are bad and one is literally exploded from the bottom while burning the board. I also found one shorted diode next to those caps D8020.
After cleaning up the burnt, the traces are obviously damaged. To fix this I wanted to make sure, my question is, were traces connected together?
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