Found this at the local dump... I know it's an old 852x480 plasma but I paid £25 for it to see if I can repair it... Worst case I will scrap it for boards or the parts.
Fault: No power. No standby LED. No relay clicks.
Tests: Mains fuse good. 230V AC on all AC side stuff. But no DC link voltage, PFC or standby. All rails 0V.
Service Manual:
Working through the PSU schematic (page 36/37) I checked diodes D005 - D008; they were good. I then proceeded to test the inrush limiters R003 - R005. R003 and R005 measure 10.1 ohms each, but R004 is measuring as a fairly precise infinite impedance. No burn marks, though - just open on an ohmmeter test.
Meter check on resistor after removal shows 8 megohms... pretty close to open...
I'm therefore suspecting R004 is the fault and will replace it.
Fault: No power. No standby LED. No relay clicks.
Tests: Mains fuse good. 230V AC on all AC side stuff. But no DC link voltage, PFC or standby. All rails 0V.
Service Manual:
Working through the PSU schematic (page 36/37) I checked diodes D005 - D008; they were good. I then proceeded to test the inrush limiters R003 - R005. R003 and R005 measure 10.1 ohms each, but R004 is measuring as a fairly precise infinite impedance. No burn marks, though - just open on an ohmmeter test.
Meter check on resistor after removal shows 8 megohms... pretty close to open...
I'm therefore suspecting R004 is the fault and will replace it.
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