What is the exact model number to your Samsung flat panel. Let me check whether it schematic is with me in my system. If it is there, I'll surely upload it to you by Google Drive, from which you can download it. I can't upload it by this window, as it do not allow me to upload pdf files.
A LN52B630 built in late 2009. Suddenly went dead. Opened it up expecting to find bulging caps. Only a blowen 3.15a fuse No burn marks anywhere. That left the heat sinks on the power board. Found two shorted FETS (FDPF16N50UT). So put in new FETS. Put power to it and all works fine. What cause the FETs to fail?
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