Hitachi 2177 TV screen is about 2mm black edges, image has fault repair method snow interference -Service Manual Download|Circuit Download|Download Drawings|schematic download|route map download|free download user manual

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Hitachi 2177 TV screen is about 2mm black edges, image has fault repair method snow interference

Time：2014-07-29 09:02:54 Source：Network Author：Unknown Clicks：1252

Hitachi 2177 color TV, set-top boxes to watch digital TV programs, the screen suddenly appear black border around 2 mm, the up and down and interference image has serious snow point. But to judge from the sound clear is not just to watch the show, suspected from the television antenna socket cable TV signal, on cable TV signal a try, image immediately clear. But the screen is still the AV state. LmHservice manual download site
LmHservice manual download site
This fault condition indicates that the machine TV/AV switch failure and image compression. By the analysis, if the CPU or the AV board failure should not lead to image compression, is likely to be the power out of the question. LmHservice manual download site
LmHservice manual download site
LmHservice manual download site
Teardown overhaul, measured only 12 v voltage 9 v. Further examination revealed 12 v voltage regulator triode Q791 sd882 (2) welding crack in the foot. After repair welding troubleshooting.LmHservice manual download site