Hi! I have a Panasonic TCP42C2 Plasma tv I've acquired with a 7 blink code. Following the Panny 13th gen troubleshooting guide (actually for the S2 series, not the C2), it brings me to the SN board. Unlike most of their tv's, the SN is a full Y-sus/Ybuffer combo, with no way to separate the sus from the buffers. Replacing the SN board with one tested good resulted in a continued 7 blink code. Dead end #1. Upon further searching, some forums mentioned the A board mis-processing the diagnosis signals sent from the SN board, resulting in a false code diagnosis. So, I replaced the A board, but again, no success.
So, with the service manual and a schematic, I've tried to nail down the cause of the problem. The service manual says the 7 blink SOS code is caused by a SN connector DET or SN scan and logic IC (can anyone tell me what a connector DET is??), while the troubleshooting guide says the diag chip is looking at the floating ground along with VScan, 15V and 5V signals on the SN board. All voltages are present at the SN board, but on looking at the diagnostic send to the A-board, I find a high voltage output kick in right before it goes into shutdown, which I figure to be the logic chip on the SN board reporting a problem in a voltage circuit.
Has anyone else had this type of problem with this tv before I go too nuts trying to find it ? I can probably post some schematics upon request! Thanks for the help!
So, with the service manual and a schematic, I've tried to nail down the cause of the problem. The service manual says the 7 blink SOS code is caused by a SN connector DET or SN scan and logic IC (can anyone tell me what a connector DET is??), while the troubleshooting guide says the diag chip is looking at the floating ground along with VScan, 15V and 5V signals on the SN board. All voltages are present at the SN board, but on looking at the diagnostic send to the A-board, I find a high voltage output kick in right before it goes into shutdown, which I figure to be the logic chip on the SN board reporting a problem in a voltage circuit.
Has anyone else had this type of problem with this tv before I go too nuts trying to find it ? I can probably post some schematics upon request! Thanks for the help!
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