TCL LCD TV L42M66H image mosaic fault repair - android - Phones Developers
TCL LCD TV L42M66H screen mosaic issue. The problem is likely located on the motherboard. It could be related to U11 (field dynamic storage DDR) or U9 not functioning correctly. Please refer to the image below for more details.
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After checking U9 and confirming it's working properly, we moved on to U11. The voltage at pins 3, 9, and 15 of U11 was measured at 2.5V, which is normal. However, pin 49 of U11 showed only 0.4V, while it should be around 1.3V.
Next, we checked C99 and found no issues. Then we examined C98 and noticed a short circuit. After replacing or repairing C98, the system returned to normal operation.