Measurement, image into integrated circuit TA7680 {7}, {8} feet abnormal voltage, only 2 v (normal is 4 v). By the circuit analysis, doubt is caused by the leakage of surface acoustic filter. Under the welding test TA7680 {7}, {8} foot voltage return to normal, measured with a multimeter R x 1 k block surface acoustic filter resistance is only 30 k Ω, suggests that leakage, try to repair. hTQservice manual download site
Will be 20 mu F / 450 v electrolytic capacitor on 100 v to 250 v dc voltage charging for a few minutes later, after electric shock to the surface acoustic filter leakage; after repeatedly shock, resistance to restore to infinity, troubleshooting.hTQservice manual download site