TOSHIBA LCD TV 50L2300U power-on flashing off the fault repair example - Appliances

MOS power IC full range

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

inductance

SMD aluminum electrolytic capacitor

Overhaul of a 50-inch LED "TOSHIBA": The guest sent a 50-inch "TOSHIBA" LED LCD TV this morning, model: 50L2300U. Power on and try to "flash off" (about one second), similar faults are common in LCD TVs (regardless of size), the appearance of such failures I think there are roughly several possibilities:
1. Constant current board and power board (the fault ratio is about 50%);
Second, the light string and the lamp bead (the failure ratio is about 40%);
Third, for the motherboard (the failure ratio is about 8%);
Fourth, for other reasons (the failure ratio is about 2%).
This data is my opinion and does not represent any position.
Therefore, I am dealing with the fault direction, with constant current and power board as the target. This is because of the short time and fast speed of the fault. This is my theoretical basis for fault handling. For this reason, when I removed the back cover, I found that the two rectifiers on the rectified output of the constant current plate were respectively reversed resistance of one of HER3O3 (close to the forward resistance), so I decisively removed it. And use the same model to reset the test machine OK. The fee is US$228. Above, thank you!