Observe the machine image sometimes good sometimes serious snowflake point, move the rf connector images can back to normal again, but after a long time to watch again. yZzservice manual download site
 yZzservice manual download site
Open the machine cover, circuit boards, it is plate combination form, motherboard found no other abnormalities, high-frequency voltage head part also found no problem. Rf input to remove part of the combination of high frequency head, when open the rf input box, found the phenomenon of three pieces of blackened, circuit board to see the other side is three patch type triode. The feeling of have some pin solder melts, and several have virtual welding, the inductance of the pin elements have no damage phenomenon appearance. The road test triode basic intact. All suspect components installed back to the main board after repair welding, commissioning picture normal again, but the next day, turn on the TV screen and a failure. The structure of high frequency distribution of two components on the market have nothing to sell, then do it yourself, using knowledge in the high frequency amplifier distribution part of the head, the following figure. Modified, the original box only power input part three pins, the rf input to the dotted line frame high-pass filtering part and PCB has to part, other parts of the PCB out with knives. When installation, using the component pin short device set together as far as possible, reasonable layout to avoid self-excitation, validate and correct after back to the main board of commissioning. Picture is back to normal again.yZzservice manual download site