First experience of replacing AS15

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

1.5PF SOT23-6 Low Capacitance 5V Breakdown Voltage 6V SRV05

Yesterday, I came across a post suggesting replacing the AS15 chip. It looked straightforwardâ€”just swap it out. But when I tried it a few days ago, it turned out to be more complicated than expected. The model was exactly the same as shown in the post, and here's the image above:

Symptom: The screen was extremely bright, and the image was barely visible. The AS15-G got hot, so I replaced it with an AS15-HF. However, the image still wasn't normalâ€”edges were jagged and unclear. After checking, I found that R337 had been desoldered during the replacement. I looked up the motherboard circuit diagram, and R337 is around 1K. I replaced it and fixed the GAMMA voltage divider resistor, but the image was still not right. There were many vertical thin lines, and a box appeared on all four sides of the screen. When I checked the picture tube, I found that R336 and R340 were open. After replacing them, the test machine worked perfectly.

Summary: Due to poor lighting during night maintenance, I couldnâ€™t see well while cleaning the pads and soldering R337. I also had to resolder R336 and R340. This shows how important good lighting is when working on PCBsâ€”otherwise, you might end up causing more damage. A faulty GAMMA voltage can lead to various image issues, such as whiteout, black screen, inverted image, loss of detail, or interference lines

Hisense_TLM32E29 (3) motherboard (1598 board) circuit diagram.pdf

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