Skyworth TV without sound emergency maintenance example [grafting method] - Home Appliances

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Photocoupler

Renovated a Skyworth 32L01MH LCD TV, no sound, the other is normal. The cover is checked and the voltage of each channel is normal. The audio output terminal has normal audio output. Further detection shows that the TDA8932BT has 2 and 14 pins with audio signal. The preamplifier LM358 is normal. After inspection, it is found that the TDA8932BT has severe heat. Hot, no obvious external short circuit, the output pin 22 feet and 27 feet to ground resistance is almost zero, the speaker cable is also removed, the detection C407/C405/C409/C401 no breakdown, the obvious sound block TDA8932BT output short circuit, But I found a lot of places, I can't find the integration block. So I thought about replacing the integrated block with the sound circuit on the waste circuit board, so I found a Konka 21-inch sound circuit. There is a hole in the middle of the circuit board. The sound version is better cut, cut and processed slightly. TDA8932BT goes down, power, ground, input corresponding to the test machine sound is normal, the volume can also be controlled, not much to say, there are pictures to prove

TV model


This is the damaged sound block TDA8932BT


Wiring on the board, power is taken from 24 volts


Additional audio version, the speaker cable is directly plugged in