I recently pulled a "dead" one of these from a customer's site - company I work for had quoted to replace with new as per policy...
Anyhow, I got it home and figured "it'll end up as landfill, may as well see what the problem is"
Plugged it in and the Power LED would flash white a half dozen times when the power button was pressed followed by the set returning to standby (red).
pulled the covers off and discovered a bunch of badly swollen 105 degree rated Samxon's of various values on the secondary side of the PSU - I checked voltages with my trusty DMM to make sure there was no failed silicon before a trip to the wholesalers for a bag of "goodies" (Matsushita caps).
One recap later and I now have a fully working LCD TV for the price of around £6 worth of caps and an hour of my time!
I would point out to anyone working on this particular model though: If you're testing with a HDMI source, put the screening can back on beforehand as the screen of the HDMI socket appears to ground thru it! (I got "no signal" so tried a VGA source before writing off the set)
Curious PSU board in this TV too: bad caps in the secondary side of the PSU, good (Rubycon) caps in the primary and good (various brands) OS-CON's on the processing board.
Thought I'd post my experiences here in case they're of any use to the group
Anyhow, I got it home and figured "it'll end up as landfill, may as well see what the problem is"
Plugged it in and the Power LED would flash white a half dozen times when the power button was pressed followed by the set returning to standby (red).
pulled the covers off and discovered a bunch of badly swollen 105 degree rated Samxon's of various values on the secondary side of the PSU - I checked voltages with my trusty DMM to make sure there was no failed silicon before a trip to the wholesalers for a bag of "goodies" (Matsushita caps).
One recap later and I now have a fully working LCD TV for the price of around £6 worth of caps and an hour of my time!
I would point out to anyone working on this particular model though: If you're testing with a HDMI source, put the screening can back on beforehand as the screen of the HDMI socket appears to ground thru it! (I got "no signal" so tried a VGA source before writing off the set)
Curious PSU board in this TV too: bad caps in the secondary side of the PSU, good (Rubycon) caps in the primary and good (various brands) OS-CON's on the processing board.
Thought I'd post my experiences here in case they're of any use to the group
. Checked main heatsink one by one with my component tester and found one 3 leg buddy MDP18N50 that passed away. Got same replacement after a week, tested, short was gone, now I got 310V on primary.