A Changhong G29K36 color TV set has a horizontal line fault. During the inspection, it was found that N30 (LA7841) was damaged. After the replacement, the airport block was smoked and shut down immediately. The newly replaced LA78041 was slammed, indicating that the circuit had a short circuit or overvoltage problem. The measurement field supply voltage was normal at 28V. [The voltage is slightly higher during normal load. Normally] No problem was found in the output section of the inspection field. After the detection of the deflection diode at the field deflection terminal, a protective diode breakdown [VD302 (1Z75) voltage regulator tube], if the short circuit immediately burned LA7841. Troubleshoot after replacement. In addition, Hisense color TV also has the same phenomenon. If there are repeated burning blocks, it is necessary to check whether the diode breaks through the leakage. Wireless Earphones,Wireless Earbuds,Wireless Earphones With Mic,Wireless Bluetooth Earphones Guangzhou YISON Electron Technology Co., Limited , https://www.yisonearphone.com