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SONY TV KV-XA25M90 dark screen    
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Joined: 08 Sep 2010
Posts: 1
Location: Hong Kong

PostPosted: Wed Sep 08, 2010 7:58 pm    Post subject: SONY TV KV-XA25M90 dark screen Reply with quote

SONY TV KV-XA25M90 have dark screen after swtich on. Sometime, hit the housing of the TV will bring back the brightness. But not always work!! Wait for few mintues to more than 10 minutes also may bring back the brghtness.
On the PCB, I have found no dry soldering points. Would it be the problem in the CRT heater? I have no schematic diagram on hand. Need help from all the experts in this forum.
Thanks for your help in advance.

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Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away

PostPosted: Wed Sep 08, 2010 8:41 pm    Post subject: Reply with quote

Screen dark - filament in CRT neck glowing orange = heater NOT involved.

Screen dark - filament in CRT neck NOT glowing orange = heater IS likely involved.

If does involve heater, foils should be easy enough to trace while looking for open joint(s).
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