Analysis and Repair: According to the fault phenomenon analysis, it should belong to the image phase problem. Beijing TCL TV repair. Therefore, first check the external circuits of pin 44 and 46 of CXA2050S, no problems were found. However, when the image is abnormal, the static voltage at pin 44 reaches 6-8V and is unstable. According to circuit analysis, this pin is connected to the X-ray protection circuit. Further examination revealed that the base potential of Q1502 on the D board was unstable. The negative voltage of D1502 was stable, so the field protection circuit issue was ruled out. Both the positive and negative voltages of D1505 were unstable, so the circuit around Q803 was carefully checked. It was found that R886 had changed in value, causing Q803 to operate in the critical state between conduction and cutoff. After replacing R886, the machine worked normally. In addition, when R884 (220kΩ) is open-circuited, this fault can also occur.
Fault Phenomenon: After turning on the machine for several seconds, the image shifts to the right.
Information Source: Beijing TCL TV after-sales service hotline http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3701157.
TCL TV, after turning on the machine for several seconds, the image shifts to the right.