Measuring voltage in the absence of the two main boot boot when there is output, value is 148v, check the output tube vq44 (2sd2253) has been the breakdown, how line breakdown should also have such a high voltage output, power supply path along the tube, found that supply copper foil has been broken, with a wire which connected, not busy with rows of tubes. The power supply part repaired again, check the voltage regulator with optocoupler nq826 (tlp621), optical limiting resistor r842 (56 ω 1/8w), work / standby section tube vq828 (2sc2230), the main regulator integrated circuit block vq827 (s1854) to replace the damaged, are the main output voltage, 115V, and the two switch machine, to illustrate the power of repaired; for a new row tube, boot, audio-visual, repairKxTservice manual download site