Skyworth 26L08HR(8K2 1 movement) LCD TV has been repaired. The machine is the power supply, and so is the high-voltage board. Lightning strikes, and many bad components. The circuit board was removed for maintenance. Upon inspection, IC 50 1 (STR-W6556a) is open, and IC603(KA43 1) is open. C608(0.0 1UF) breakdown, ZD602( 18V) breakdown, ZD603(30V) breakdown, resistance R00 1 increase, R604 open circuit, OT601(8/kloc-). A 36V electric vehicle bulb is connected to the cold ground of C6 17+ terminal as a dummy load. The voltage at the input end of the power supply is reduced to 120V through the voltage regulator, and a resistor of 1.5K is connected between the nodes (standby control points) of R576. R503 and +5V. The light bulb goes out after being energized, and IC50 1 is tested. The reason is that the disconnection point between 24V and the high voltage board is unreasonable, so that the optocoupler can't get the working voltage of 24V, and the six pins of IC50 1 have no regulated control voltage, and the power supply voltage of four pins is 25V, which has exceeded the threshold voltage of 23V. When IC50 1 stops, the circuit has no output, which leads to many detours in maintenance. Later, L603 recovered. Then there is an object similar to a high-power patch capacitor on the +B24V circuit leading to high voltage, with a T-shape on it, and the position number is F50 1. (essentially patch insurance. ) remove F50 1, turn on the light bulb again, and the measured voltage is 7.8V D607 measures that the output voltage is normal 5V, and the input voltage rises to 230V. +B. Remove the 1.5K resistor originally connected across the standby terminal, and the+B voltage is normal 2.9V After one-hour test, the output voltage is quite stable. At this time, the voltage of each pin of ic50 1 is measured: 1 pin D, 3 10V, 2-pin empty, 3-pin S, 0V, 4-pin power supply and overvoltage protection 18 pin. The TV is installed and everything is normal when it is turned on. Thanks to Ren Runan, Feng Feng and other technicians for their replies.