Hi all,
My plasma is playing up again. The ZSUS failed and was replaced 6 months ago but now I've had it fail again.
Symptoms: On power on, relay clicks but no picture. Pronounced buzzing from both SUS boards. Buzzing drops in pitch a few moments after power on. CTRL board diode is flashing three short one long ( . . . ______ )
See this video for buzzing and CTRL board diode flashing.
History: This is similar to what happened 6 months ago except it was the ZSUS only making the noise. Replacing it fixed the issue so the first thing I did this time was replace the YSUS. This didn't fix it.
Voltages:
VS = 203
VA = 54
YSUS VY = -180
YSUS VSC = 147
ZSUS VZB = 105
Troubleshooting: I've disconnected the upper, lower and both buffer boards. No change to buzzing from YSUS, no picture on upper/lower screen. I've disconnected ZSUS and YSUS boards, no change.
I bridged R51/R52 and disconnected P31 as shown here and the display powers on and shows test patterns.
This leads me to believe that the main CTRL board has failed but I wanted to get a second opinion before I spend any more money.
My experience in these kinds of things is rudimentary but I'm hesistant to hand it over to the shop until I've done all I can.
Any help much appreciated.
My plasma is playing up again. The ZSUS failed and was replaced 6 months ago but now I've had it fail again.
Symptoms: On power on, relay clicks but no picture. Pronounced buzzing from both SUS boards. Buzzing drops in pitch a few moments after power on. CTRL board diode is flashing three short one long ( . . . ______ )
See this video for buzzing and CTRL board diode flashing.
History: This is similar to what happened 6 months ago except it was the ZSUS only making the noise. Replacing it fixed the issue so the first thing I did this time was replace the YSUS. This didn't fix it.
Voltages:
VS = 203
VA = 54
YSUS VY = -180
YSUS VSC = 147
ZSUS VZB = 105
Troubleshooting: I've disconnected the upper, lower and both buffer boards. No change to buzzing from YSUS, no picture on upper/lower screen. I've disconnected ZSUS and YSUS boards, no change.
I bridged R51/R52 and disconnected P31 as shown here and the display powers on and shows test patterns.
This leads me to believe that the main CTRL board has failed but I wanted to get a second opinion before I spend any more money.
My experience in these kinds of things is rudimentary but I'm hesistant to hand it over to the shop until I've done all I can.
Any help much appreciated.
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