Originally Posted by
tw2005
As suggested I'd lean towards checking the sustain boards, predominately the xmain for shorted IGBTs( transistors)
also search for a training / quick guide on fault finding this series. I think with these later models this is the case:
"Will not be run with the “X” or “Y” main disconnected. The SMPS will shut down immediately. However if a meter is first connected to the test point when power is applied it will read the correct voltage briefly before shut- ting down.(You have enough time to check key voltages)"
CAUTION: Do not reconnect any connectors to SMPS or Y/X Boards until power has been turned off long enough for Vs to drop below 10V or damage will occur to X or Y Boards.
Check the part numbers on the ymain and xmain and see if these match.
BN96-16523A
X Main
BN96-16524A
Y Main
If so then google PN51D550C1FXZA Fast Track Troubleshooting Manual. You should get some hits and download. That should help you get ontrack
Good luck.
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