Chosen Solution
Hi, I have an older plasma TV I am trying to repair. It is a Samsung PN51D550C1FXZA version N411 and I’ve owned it about 7 years. It started acting up by turning off/on by its self and then finally would not power on and the standby light is OFF. I’ve tried unplugging it, and trying a different outlet/cable. I removed the back of the panel and inspected the power boards (there are two addition boards with large capacitors and heat sinks, not sure what they are for but I inspected them as well). I can’t see any obvious signs of thermal damage or puffing capacitors. I did a continuity check on the fuse, it checks OK. Next I plugged in the power board and checked the voltage at the blue wire labeled standby going from the power board to the logic board and got a reading of ~2.93 volts steady. The PCB does not state what the voltage should be. At this point I am not sure what my next tests should be and would appreciate some guidance. I am familiar with reading circuits and using a multi-meter but I do not have a tool to measure capacitance. Thanks for the help!
Hi @jokesonspokes , Here’s a link to a fast track fault finding service manual for the TV Reading it, it appears that your Standby Voltage (CN 801 #2) is too low. It should read 5V You may be able to find a schematic of the power board by searching for (insert power board number) schematic. Worth a try. Hopefully this will be of some help.
