Hello all,
I have an Insignia plasma here that a friend asked me to take a look at. When I first received the set, it would power on, with audio (sometimes), the display would glow for a few seconds and then stay black with very slight green sparkles, it would stay like this indefinitely. I figured the sparkles were a voltage problem, which I would worry about later on, those along with the display priming at start up made me pretty certain the sustain board was working. I figured I was dealing with a mainboard fault. (I've worked on two Samsungs with the same issue, both were mainboard problems). But, upon opening up the tv to get part numbers and troubleshoot (hadn't done anything yet), the problem changed entirely.. Now when I plug the set in, I hear a relay on the power supply click a few times (sounds like 3 on-off cycles), and then nothing, no activity from the display whatsoever, no sound.
What I have done so far:
Visually inspected all capacitors on the power supply:
One is ever so slightly bulged, I mean very slightly. No other problems visible.
Checked both fuses with my ohmmeter:
Both good.
Checked all outputs on the power supply during on-off cycles when plugged in:
The 15v and 5.3v outputs to the T-Con and mainboard are active, on and off with the clicking, proper voltage, then stay off when clicking is done.
The Vs and Va outputs to the sustain board, however, show no activity at all.. I found this interesting, however I'm not sure if this shows a bad PS or if it waits for some signal from the mainboard before powering these..
I should also note that I have already replaced the mainboard (the part was already ordered so why not), nothing changed. I am felling like this is a dead PS, but any input would be great!
Thank you very much for taking the time to read my spiel.
I have an Insignia plasma here that a friend asked me to take a look at. When I first received the set, it would power on, with audio (sometimes), the display would glow for a few seconds and then stay black with very slight green sparkles, it would stay like this indefinitely. I figured the sparkles were a voltage problem, which I would worry about later on, those along with the display priming at start up made me pretty certain the sustain board was working. I figured I was dealing with a mainboard fault. (I've worked on two Samsungs with the same issue, both were mainboard problems). But, upon opening up the tv to get part numbers and troubleshoot (hadn't done anything yet), the problem changed entirely.. Now when I plug the set in, I hear a relay on the power supply click a few times (sounds like 3 on-off cycles), and then nothing, no activity from the display whatsoever, no sound.
What I have done so far:
Visually inspected all capacitors on the power supply:
One is ever so slightly bulged, I mean very slightly. No other problems visible.
Checked both fuses with my ohmmeter:
Both good.
Checked all outputs on the power supply during on-off cycles when plugged in:
The 15v and 5.3v outputs to the T-Con and mainboard are active, on and off with the clicking, proper voltage, then stay off when clicking is done.
The Vs and Va outputs to the sustain board, however, show no activity at all.. I found this interesting, however I'm not sure if this shows a bad PS or if it waits for some signal from the mainboard before powering these..
I should also note that I have already replaced the mainboard (the part was already ordered so why not), nothing changed. I am felling like this is a dead PS, but any input would be great!
Thank you very much for taking the time to read my spiel.
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