Boot fail over a period of time, some components poor thermal stability. Image amplitude, brightness, flashing, big and small fault can be generated by the power supply voltage fluctuation; Can also be caused by high pressure fluctuations. The key in the power supply circuit. WDSservice manual download site
[maintenance method] WDSservice manual download site
(1) + B voltage on both ends of the boot C909 multimeter test, found that between 90 ~ 115 v passive, normal for 111 v power itself, should further judgment or load power fluctuations. WDSservice manual download site
(2) unplug the power plug, will pick in the 111 v regulated power supply C909 at both ends, the TV everything is back to normal. That fault is generated by the switch power supply itself. WDSservice manual download site
(3) in addition to use plus a regulated power supply, also can to load disconnect, 500 Ω 50 w dummy load, whether the power fluctuations. WDSservice manual download site
(4) to use the machine power supply, further examination power failure. Using the cooling method, using alcohol sponge STR6020 block of thick film cooling, no effect. Again with alcohol cotton ball for sampling rectifier D907 cooling, fault namely hai! I removed. To show that the fault D907. WDSservice manual download site
After replace the new tube z EH - 1. Everything is back to normal.WDSservice manual download site