Maintenance of Changhong LCD TV TL19629 power supply problem, the power board burned seriously, carefully remove the circuit board, some of the chip resistors have been burned beyond recognition, the online download drawings have no component values, so I have to refer to the FET circuit for the perfusion tube, estimate the corresponding value , fill it up.
In order to avoid the burning failure again, the external 5V is used, the voltage regulator part and the optocoupler are checked normally, and the driving waveform is measured when the power tube is not installed. Now the power tube can be installed. Power on, the power board returns to normal. I have already filled in the values ​​of the chip resistors for the perfusion circuit for your reference.
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