The T con board is faulty. It is the board with flat ribbon cables going to the bottom of the screen. It is not hard to replace this board. You can get one from here:
TV Parts Universal TV Stands DLP Chips ShopJimmy
Only sound but no display on Samsung SyncMaster MW series TV/Monitor set it's most likely caused by the inverter transformer failure: on the MW-932 check it on the power board, it's a square black component with 10 pins (4+6), very easy to replace. Part number is TMS91429CT, it costs about 10-15 USD/EUR. I've fixed sereverals with the same problem.
No Picture / Black Screen
support-us.samsung.com/.../pop_troubleshooting_fr...
Samsung ElectronicsMay 27, 2011 - LN-T4669F No Picture / Black Screen. To determine why your TV hasno picture, start by follow these steps: Turn your TV on. Press the MENU ...
TV Has Sound But No Picture Troubleshooting Guide ...
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https://www.youtube.com/watch?v=ysHfaQKI45M
Aug 31, 2012 - Uploaded by Repair.com
Here are some steps to ease you through TV picture loss-from prevention to ... TV Has Sound But No Picture Troubleshooting Guide ... So frequent overheating not only shortens the lamp life, but your TV picture life as well. ... How To Fix Samsung LCD TV -Samsung TV Repair (Blank Screen) - Duration: ...
LCD Easy Fix (sound but no picture) - YouTube
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