Panasonic TC-P50C2 MC127H36U13 stopped working. Would not turn on. No LED no relay click. Bought replacement “A” board on e-bay and installed it. Now hear relays click but then get seven LED blinks.
Service manual says this is SC or SS board problem. Green LED on SC lights for a couple of seconds then goes out when I hear the relays drop.
Voltage on signal “MID” which connects to SS card only gets to +15V and
should be between 65 and 147 volts. This sets error SOS7. Can not see a short from +15 to MID using ohm meter.
Used oscilloscope to look for drive signals from the A card to the SC card
(cmh, csh) and also to the SS card via the C2 card (umh, uml). Could not see any transitions. Also noticed that error SOS8_SS is being detected and I guess this would show up if it got past the 7 blinks.
What would prevent the A card from trying to drive the SC card? Any suggestions as to what I should look at?
Service manual says this is SC or SS board problem. Green LED on SC lights for a couple of seconds then goes out when I hear the relays drop.
Voltage on signal “MID” which connects to SS card only gets to +15V and
should be between 65 and 147 volts. This sets error SOS7. Can not see a short from +15 to MID using ohm meter.
Used oscilloscope to look for drive signals from the A card to the SC card
(cmh, csh) and also to the SS card via the C2 card (umh, uml). Could not see any transitions. Also noticed that error SOS8_SS is being detected and I guess this would show up if it got past the 7 blinks.
What would prevent the A card from trying to drive the SC card? Any suggestions as to what I should look at?
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