32 Hisense LCD TV boot display LOGO after black screen repair - android - Phones Developers

SMD aluminum electrolytic capacitor

Chip ceramic capacitor

Patch Murata capacitor

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Single chip microcomputer STM32L151CCU6

Renovating a Hisense 32-inch LCD TV, booting the logo after the black screen, booting to check the normal voltage, the backlight voltage dropped from the boot 157v to 107v, it should be protected, the backlight chip is hl3051mg1, check the chip pin function is fruitless, I don't know which foot is protected, I just watched the circuit slowly clean up, looking for the feedback loop of the backlight voltage. When I found a way from the backlight voltage positive electrode through two 514 and a 274 chip resistor to the chip two feet, I thought it should be It took two 514 resistance measurements, one of which is infinitely large, the other is normal, because the chip resistor is not easy to operate and is prone to deterioration, 遂 three five-ring resistors are found, the original machine 514 is 510k ohms two series I connected the three resistors of 330k in series and the test machine was all normal. The voltage of the two-pin chip is 1.78v, and there is no problem in the test machine for two days.