Konka LED32m2800pDE three no maintenance examples - appliance repair - Huaqiang electronic network

After repairing a Konka 32-inch smart network TV, the user mentioned that he was optimistic in the previous year. However, one afternoon, he heard a loud bang when turning on the TV, and it didn’t respond at all. Initially, he thought it was a power issue. He contacted the service center, provided the price, and arranged for the unit to be picked up and sent for repair. Upon disassembling the TV, a visual inspection revealed significant damage on the three-in-one board, specifically on cW912, which had a large burn mark, and R912, which was also blackened. The fuse F901 (4A) was found open. Further checks showed that the rectifier bridge VW9017N65L was functioning normally, and the load showed no visible damage. The fuse was replaced with a 3.15A cylindrical one, and cW912 was replaced with a 101K2KV component. After replacing these parts, the power test was conducted, and the indicator light turned on, but the TV failed to power up properly. Voltage measurements showed instability: 12V and 100V were not consistent. Checking the voltage on pin 4 of NW907 showed 4V, pin 2 had 2.13V, pin 3 was 4V, pin 4 was 0V, pin 5 was 0.48V, pin 6 was 16.41V, pin 7 was empty, and pin 8 was 300V—these were all normal. However, the boot raster still did not appear. It was noted that some models use NW907, 6755, or 8671 ICs, and after checking, the correct replacement was made, leading to a successful boot-up. The repair process included multiple steps, from initial diagnosis to component testing and replacement. Several images were taken during the process, showing the damaged components and the final working state of the TV. These photos help illustrate the condition of the board before and after the repair, offering a clearer view of the problem and the solution implemented.

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