Hello everyone!
So from the free pile yesterday I got a Samsung PN51F8500AFXZA that wouldn't turn on. Stand-by light did not illuminate. Found fuse FP801S open, the DC legs of both Bridge Rectifiers shorted and MOSFET QP802S short drain to source. Removed QP802S and short on Bridge Rectifier cleared. Confirm QP802S is short drain to source. No short found on QP804S.
Control IC ICP801S is TI SPC1012T.
Questions:
Is there a way to test ICP801S with a multimeter for short/failure?
Neither DigiKey or Mouser stock SPC1012T. Is there a means to find an equivalent they do stock? If not does anyone have a recommendation for a supplier?
In the last picture I am pointing to a semi-solid gel like substance that covers QP802S, QP804S and ICP801S which has to be removed to replace the MOSFETs and control IC. What is this semi-solid gel and should I replace it after installing these items?
Lastly, I know these control ICs sometimes survive a shorted MOSFET, and with only one shorted drain to source does anyone have an opinion on the likelihood ICP801S is actually defective?
Pictures enclosed. Thanks!
So from the free pile yesterday I got a Samsung PN51F8500AFXZA that wouldn't turn on. Stand-by light did not illuminate. Found fuse FP801S open, the DC legs of both Bridge Rectifiers shorted and MOSFET QP802S short drain to source. Removed QP802S and short on Bridge Rectifier cleared. Confirm QP802S is short drain to source. No short found on QP804S.
Control IC ICP801S is TI SPC1012T.
Questions:
Is there a way to test ICP801S with a multimeter for short/failure?
Neither DigiKey or Mouser stock SPC1012T. Is there a means to find an equivalent they do stock? If not does anyone have a recommendation for a supplier?
In the last picture I am pointing to a semi-solid gel like substance that covers QP802S, QP804S and ICP801S which has to be removed to replace the MOSFETs and control IC. What is this semi-solid gel and should I replace it after installing these items?
Lastly, I know these control ICs sometimes survive a shorted MOSFET, and with only one shorted drain to source does anyone have an opinion on the likelihood ICP801S is actually defective?
Pictures enclosed. Thanks!
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