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Panasonic TH-42PV700C LCD TV sometimes green indicator lights, no repair method for optical silent fault
Time£º2014-07-13 16:14:34  Source£ºNetwork  Author£ºUnknown  Clicks£º1194
  

Measurement when failure occurs, VSUS and + 15 v power output, separate test P plate have no problem. In accordance with the principle of maintenance fault area first one refinement; First to separate TU component separate test other circuit, determine the fault components in TU. MN4service manual download site
 MN4service manual download site
Recovery machine all circuits connected properly, the H4 sockets electricity measurement of 21 feet STB5V is normal, no voltage 16 feet and 18 feet. According to the working principle of the circuit, controlled by the secondary IC1100 boot. When measuring STBMCU found several pins have black oxide. MN4service manual download site
 MN4service manual download site
Remove the IC1100, with art design knife to cut through the above oxide, clean circuit boards welding good IC1100 again, commissioning, troubleshooting.MN4service manual download site
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