Model: Changhong LT24630X LCD TV Failure: Blue light is not turning on. Overhaul: I picked up a Changhong LT24630X LCD TV. The blue light doesn't turn on consistently—it sometimes works and sometimes doesn't. It can't boot properly and has been idle for over a month.
The power supply voltage of 12V and 5V was measured to be normal. Then, the MOSFET's first pin (1) was checked and found to have 5V, which is normal. However, pins 5, 6, 7, and 8 of the MOSFET showed 0V. After shorting the MOSFET, the backlight turned on, but the system had unstable boot behavior. Next, the two memory chips, 25LC32 and 24C32, were removed. They were tested using a programmer. The 25LC32 data was normal, but the 24C32 was empty. Reprogramming the 24C32 did not work. So, the 24C32 was replaced using a dual-inline package, and the data from a forum was burned into it. After installation and testing, the TV booted normally. Then, the factory mode adjustment screen was accessed by pressing the mute, menu, and 7217 buttons on the remote control. The unit was reassembled and tested successfully.
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