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ive seen that exact controller IC used in numerous other LCD sets that I have worked on. its even heatsinked. the failure rate of that CPU control IC is low... so low that it isnt evne possible, however the vizios use the same IC and they DONT have a heatsink, but i find them failing an alarming rate becuase of lack of a heatsink, proper heatsinking problem never shows up.
In your case, i would vote out the main IC. what you need to do is monitor the on-board boost/buck switching regulators that pump out the proper core voltages for shorts and/or proper voltages. standby light is probably dim because there is a short in the rail on that main control module. ive delt with a couple of other brands with similar issues, and it turned out to be core regulator output transistors had failed.
keep an eye on these. And im also sure it goes without saying, in standby mode, check for excessive heating of any transistor, and obviously the CPU core. if the CPu gets abnormally hot then your done, only solution is to replace the board unless you can find a supplier in china for the IC, and usually these ICs have custom programming stored on the IC itself so your chances for that are none... And check your class-D audio output circuits for rail loading.
Last edited by mbates14; 10-29-2009 at 05:14 PM.
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10-29-2009, 05:07 PM
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