Question about Hitachi 60UX54B/55K 60" Rear Projection Television
WAS WATCHING TV, JUST WENT OFF. TOOK OFF BACK RED LED BLINKING, UNHOOKED POWER APPLIED POWER RED LED LIT GREEN LED LIT THEN IN 2 SECONDS EVERYTHING WENT OUT. RED LED STAYED BLICKING
So if you have a blinking red protection LED:
Turned out the pico-fuse for the -23V had 130 ohms resistance. Initial continuity test feature on my meter indicated it was good since anything under 200 ohms is continuity. All of this after many hours of frustration... and not understanding why all secondary voltages on the power transformer were at 50% for the 2-3 seconds of power up before shutting down.
The "leaky" pico-fuse turned into resistor allowed enough power to illuminate -23V LED despite voltage being 1/2.
Replaced with new pico-fuse to get true -23V. All other output voltages followed suit and TV is working perfectly.
Don't trust the green LEDs. Measure all voltages and be sure to verify 1 ohm or less for every pico-fuse.
I don't understand how a faulty -23V rail would cause this problem. Feedback is from the +31V rail which powers standby 12V safety regulator, 9v and 5v switched regulators.
Anyways it works now.
Posted on Nov 10, 2008
RED light is protect circuit = do not disable !
Look for C702 near flyback transformer - might be hidden in
glue = check it = if shorted, replace 102K / 2KV with 3KV =
Sony part # 1-161-754-00 and replace E994 pico fuse.....T.
Posted on Nov 08, 2007
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Posted on Jan 02, 2017
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