First test + B, + B rose to turn the power on and the machine protection 140V, + B slowly a few drops to 20 V. Whereby some of the basic power supply is normal, but the machine more protection circuit to determine the point of failure is not easy. The machine protection circuit pillow beside the line becomes the school board (TNP0A0028), the power measurement X22/13 foot (X-RAY) to protect a few feet Voltage 0:00 V, normal to 0V. Off one by one overvoltage overcurrent detection circuit, power observed (short test machine generally does not expand the scope of failure). When disconnecting + B overcurrent detection circuit (disconnection D752), the boot images, audio and more back to normal. The problem lies in over-current detection circuit composed of Q750, Q750 measure properly removed, installed and detected on the part of the other components (D750/C750/D752 ...) are mostly good. Then boot or protection, or the possibility of taking into account the relatively large transistor bad and decided to Q750 (2SA1010) replaced. Test machine everything is normal.fjzservice manual download site