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Hitachi 50EX16B Protection LED

 
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Beyond



Joined: 23 Dec 2007
Posts: 8

PostPosted: Sun Dec 23, 2007 1:53 pm    Post subject: Hitachi 50EX16B Protection LED Reply with quote

I have a Hitachi Projection TV Protect Led would come on no other Leds (green) would relay would click when power button was pressed. I replaced I901(STRM6511) as well as STK4274 (3). Now set comes on but protection light comes on and -27v led does not light, indicating trouble on that line, all other green leds lit. I do not have a service manual for unit. I have checked all caps (esr) resistors, ect. although picture looks fine other than need of convergence touch up. Chassis AP52 Any suggestions? Thanks.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Mon Dec 24, 2007 9:52 pm    Post subject: Reply with quote

Get anywhere?
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Beyond



Joined: 23 Dec 2007
Posts: 8

PostPosted: Sat Dec 29, 2007 12:35 pm    Post subject: Hitachi 50ex16b Protection Led Reply with quote

I found the problem. There was a Hair Line crack in the copper trace at pin 2 of I906 (-12V Reg) going to R953 (5.6K) and D953 (-27V LED). Once repaired -27V LED on Protect led off, and all works fine.
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