AWA MHDV2211 (Board 303C3206072) - voltage regulator failure

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia
    #1

    AWA MHDV2211 (Board 303C3206072) - voltage regulator failure

    Today, I received an AWA MHDV2211 TV to repair.
    Despite replacing all but the 400V CapXon unit in the non-PFC power supply and C163 (after a switching regulator) on the main logic board (303C6206072), I still get the effect as per my YouTube video before I replaced them - all but one of the electrolytic capacitors I replaced were Aishi units.

    Elsewhere on this forum, I have read about linear voltage regulators failing in flat panel TVs ; so I decided to measure the output on each of them (with the set powered on and not in standby) and found that U14, an AMS1117-ADJ was faulty, of which I did not have any spares on hand; so I used a more readily available LM317T which was similar to the original and this fixed this problem.

    Apparently, U14 is the regulator for the CPU core and/or RAM; output loss from this regulator (after warming up) caused the CPU to crash.

    My YouTube video of this fault: http://youtu.be/X0yzeK-aNQY
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
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