At 6:30 in the morning, someone still called to repair the TV. When I went to see the three no, I went to the store to disassemble and check that there were 310 not falling, no 140. I checked the original circuit of the circuit regulator circuit before and after, and found that 431 was fried. Optocoupler breakdown, decisive judgment 5Q1265RF death penalty, change the thick film, optocoupler 431 boot, 140 keep shaking, then find the resistance of the three-stage tube 124 breakdown, 4148 breakdown, because there is no 124 at hand, had to use 1815 generation Change, in the base level series 22k, be parallel 22k resistor, boot, everything is normal!
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