Skyworth color TV 25T91AA lightning strike three faultless maintenance examples - Appliances

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Fault phenomenon: Skyworth color TV 25T91AA after the lightning strike three no.
Repair process: Check that the fuse is broken. Q604 has broken down. When the repair is busy, the output of each group of the switching power supply has no short circuit. Like the lightning strike, I usually use the module to try to check whether the cold part of the TV is damaged. After welding Q604, connect the module, adjust the voltage to 125V, and the voltage of each channel. Also basically normal, press the P+ button but the TV won't open. Short circuit P+ can not be opened as well, because Skyworth TV has a child lock function. If the user has opened the child lock, P+ cannot be opened, so it is not sure whether there is a problem with CPU1.
Without a remote control, I found a universal remote control (When Skyworth TV is in standby, many machines can be turned on by pressing the volume button after pressing the setting button on the universal remote control), but it still cannot be opened for a long time.
There is no way I can remove the memory to try, because the OM8370 is in the boot state when there is no memory, I tried it before (I don't know if every block is like this), I still can't open it after I remove it, I have to tell the user that the super chip is bad. Tell him to take it in a week.
After the chip arrived, I removed the OM8370, soldered the socket, and put on a new chip. The TV is turned on, the raster is normal, but the characters are on the upper side, (there is no memory installed at this time), because I bought 3 chips, and after installing the second one, it is not turned on, but the third one can also be pressed. Open, I am good to the universal remote control, all functions are normal, plug in the video cable, the image sound is normal, re-solder the memory test machine, the TV is in standby state, press the good universal remote control power button, still can not open Is the remote control not right? Re-removing the memory, the grating appears again, try the universal AV\TV button, the video can be converted, the volume is also normal, press the remote control power button, the TV can be turned off, but press the remote control power button but can not open, test the chip The voltage of each foot is also basically normal. There was no clue for repairs.
Isn't there a good chip? Replace with the new first chip failure.
The two chips should have the same probability of failure, and the functions are normal at the time of booting. At this time, the power is re-thinked. I adjust the voltage to 125V. Will it be low voltage? Turn the module to the 135V test machine and everything works.
Re-testing the original chip and the chip that I was sentenced to "death" is not good.
After checking the power supply, only the fuse is broken, Q603, Q604. After the TV is replaced, the TV is normal. The last post was a module that caused me to find a fault, but this time it made me take a detour.
I didn't want to send this post, because this lightning strike was originally a small problem, but the detour I took just confirmed the 2,092,649,198 super version in my last post. "A noteworthy question - the sensitivity of the circuit to voltage. "A post talked about the OM8370's demanding power supply, I remembered that the newly repaired OM8370 is indeed very sensitive to power supply.