Hi.
There is a service bulletin. The problem is usually caused by a defective DM power board. Before replacement, the power board must be tested. Rather than replacing the whole board, the repair job is done testing and replacing at component level.
Here from Mitsubishi Bulletin:
Chassis V21 (this TV): Check C9B01, C9B02, C9B03, C9B13, C9B14, C9B17 and C9B18 (1000 uFD, 16V, 105C) on the DM Power PCB located within the DM Assembly. If they are bad, replace them with part # 181P734030 (680 uFD, 16V, 105C).
Here Service Manual - Chassis V21
Here Tv Repair Kit (not necessarily the cure, parts must be tested, the repair involves testing and soldering and must be done by a trained person).
Regards.
Ginko.
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