Source: Beijing Toshiba TV Repair Center http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3764604. Toshiba TV, audio volume extremely low, adjusting the volume switch is ineffective. Solution: After replacing Z675 (6.5MHz), the fault was eliminated. Analysis and repair: After turning on the power, use tweezers to touch pin 16 of M51496P and pin 20 of P104 plug respectively, a noticeable "click" sound can be heard from the speaker, indicating that the audio intermediate frequency amplifier and demodulation circuit are functioning properly. Then use tweezers to touch pin 12 and pin 16 of TA8615N respectively, the speaker's response is very weak. Measure the voltage of each electrode of Q671, the actual measurement results show that Ve and Vb are unstable values of 0.1~1.1V, while Vc voltage is basically normal. Upon inspection, it was found that Z675 around Q671 has severe leakage. Beijing Toshiba TV repair.