Panasonic TH-C50HD18 (TH-50PX80U) has 4-blinks on shut down. Replaced the A board (main board) and P board (power supply). No change. Unplugged cable from the SC board to the lower C boards. Panel fires. TV stays on. Changed each C board, one by one, still has 4-blinks. Is it possible I have a short in a ribbon cable, shorted panel or ? Any help would be great!
I have seen a fault where the Plasma display was giving sparkling green dots, and then the set would shut down after about 10 minutes. After waiting for about 40 minutes, I would re-start and the process would work the same, and then the set would shut down.
I tried freezing the boards one by one with freeze-spray, and heating with a heat gun to see where the thermo fault could be. I had no success.
Fortunately I had access to a scrapper set of the exact same model. After spending many hours with the process if elimination, I worked the fault down to be the screen itself! Unfortunately, with the scrapper set that I had its screen was very weak. Swapping the screens between the two sets proved that the original screen has failed.
I don't want to discourage you. You may be down to the point of what I reached!
Jerry G.
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my sc boards burn out need to replace them
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