Panasonic TH-42PX77U

[dbier63]

Set shuts off and blinks 7 times. Any thoughts?

[tw2005]

Re: Panasonic TH-42PX77U

could be SC, SU, SD, P board

There is a troubleshooting guide for this series

[dbier63]

Re: Panasonic TH-42PX77U

So I did a little more troubleshooting. I found that the 2.2K ohm (white) resistor on the SC1 board heats up to about 430 deg. when operating. When I remove the top board (SU) the resistor reads 125 deg. Also the 6 chips on the top board heat up but the 6 chips on the lower board (SC) do not heat up. Maybe the SC board is bad? Any thoughts?
Thank you.

[Alastair E]

Re: Panasonic TH-42PX77U

7-Blink indicates 'Floating Supply' VSCN or VAD issue--Or being dragged down by fault on SC--maybe around Q660 or a Fault on either Buffer (SU/SD)....
Check VAD and VSCN without Buffers connected--Then again With...

VAD around Minus 185 and VSCN around Plus 160

[dbier63]

Re: Panasonic TH-42PX77U

Ok thank you but I'm not sure what VSCN or VAD is. Can you help with where to check these voltages?

[dbier63]

Re: Panasonic TH-42PX77U

Ok thanks I found them VSCN is39.26V and VAD is -105V