trailmug Posted February 8 Share Posted February 8 Paying a visit to the bus for some maintenance and thought I would post my experiences with the Sharp Aquos TV in the bedroom in our sig. It's an old 720p LCD, but the cabinetry is nicely built around the exact shape of that television, and I was finding it difficult to find a TV that would even fit in the hole, if I even wanted to try to fashion up some trim. I'm not much for woodworking, so I figured I would go for broke and try to fix it. It works out that there's a common failure in the Delta power supply board used in these. It uses a single zener diode as a snubber for the standby power supply transformer, which is prone to failing short. The part number on the PCB is D7907. I replaced this once only to have it fail again. Maybe it doesn't like eating the stepped sine wave of the inverter, who knows.. The reference design for the SMPS IC is to use an RC snubber, and the board had solder pads for the passive parts, so I soldered them in. It's been working nicely for a year and a half. Here's the replacement parts list, and a photo of the repair, in case anyone ends up wanting to tackle the same issue.. not a bad deal for less than $1 in parts. 😁 R7917 and R7918: 200kOhm 1/8 watt C7913: 2200pF 1kV Vishay Series F, PN: F222K53Y5RN63K7R D7907: remove If memory serves, this power supply has a "hot chassis," so keep your hands to yourself if you have it plugged in with the case off. 2 Link to comment Share on other sites More sharing options...
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