Type a Hitachi P50AlOIC flat-panel TV, boot properly to about half an hour, then enter into the state of protection (figure sound disappeared under the green light flashes three stop again flash three times), after the shutdown cooling and turned to watch for a period of time. GU8service manual download site
 GU8service manual download site
Teardown check, found beside the board v voltage on the power plug for fan is the row of the plug seems very loose, doubt thermal protection caused by fan does not turn, but the fault is still tight platooninsert after commissioning. According to light may Y board and buffer board has a problem, will Y and Z plate, remove the repair welding power supply board, then watched a long time no problem, but to say that now green light, the black screen, can't remote control switch machine. Looked at the door the next day, indeed as expected after startup sound as didn't bright protection in screen, press the "standby" button cannot return to standby mode (crash), turned several seconds teardown found the fan has stopped, thought the bad, will not be Y board or buffer board damaged. Normal boot VS voltage measurement but not VA voltage, VA measurement of resistance is normal, but rest assured a little. Remove the power supply board, found that the VA power part two light coupling between the feet have a solder ball, the VA voltage is normal, after excluding troubleshooting.GU8service manual download site