Line breaks to dummy load boot, or a "kaka" sound, carefully listen to the sound from the relay RL801, is RL801 constantly and off. Voltage measurement as the main voltage and the other two road, with the continuous absorption of relay, voltage in 0 ~ 3 v, 0, 0 ~ 44 v ~ 23 v change, suggesting that consists of Q802 etc on standby voltage control circuit has a problem. For circuit boards have weld beyond recognition, solder joint and substitution Q802, D804, D803, C810 after the fault has not changed, check R806 associated with standby voltage regulator control circuit, found that the resistance to 220 k Ω WeiXiuZhe change before (), put on a 220 Ω resistance (marked resistance) boot, relay is no longer a noise, the main voltage output is 99 v, pass circuit, image sound all normal.fKYservice manual download site