AVS Special Member
Join Date: Sep 2000
Location: Northern California
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It sounds like the Tv is coming on and staying on? right? it's not clicking off?
If you see something on the screen (samsung logo) momentarily then it goes away, it could be bad backlights or power/inverter board problem. If it's backlights then that is serious (cracking open the lcd display panel to replace backlights is not something Tv repair shops even do).
If you connect a signal, turn on Tv, then after it goes out, shine a flashlight into the front of the screen, can you make out evidence of picture in there? Move the light around different areas, bring up tv menu or volume osd...
Might be able to check some DC voltages. This model had a few different panel versions, so different board layout. If you can post some large high quality photos of the back of the Tv showing the board layout then maybe can help further.
XBR-65Z9D | AVR-X2200W | UBD-K8500 | JRMC HTPC w/9 cable tuners | Fluance SV 7.1 + eD A3-300