Repaired TCL LCD TV LE32D99 TV, power supply three no, open cover visual inspection no abnormality, measuring main capacitor 330V, 5VS output 5V normal, other three 5V, 12V and 24V have no output, forced start power failure is still, picking up maintenance According to the drawing check, 5VS normal indicates that the auxiliary power supply is normal. The five-pin voltage of the sub-power supply drive block IC1 (OB2273) is normal at 19V. The five feet of the main power drive block IC2 (OB2273) are only about 10V and are fluctuating. The five-pin power supply of the drive block comes from the same place, indicating that there is a problem with the branch of the IC5 five-pin power supply. Check that all components are normal, and use the substitution method in desperation. It is found that the ZD1 (20V) voltage regulator is replaced after the fault is replaced. In order to prevent misjudgment, the faulty component is connected to the external 30V power supply through a 10K resistor. It is found that the voltage regulation value is continuously reduced. The new component (using two 10V series) is connected as usual, and the voltage stabilization value is stable at 19.9V. The problem is that it is , attach pictures and power drawings for your reference. Fork Type Connecting Terminals Fork Type Connecting Terminals,Terminals,Connecting Terminals Taixing Longyi Terminals Co.,Ltd. , https://www.txlyterminals.com LE32D99_ power board schematic _V2_20120707103445940[1].pdf