Model: Changhong LT24630X LCD TV. Failure: The blue light is not turning on. Repair process: I picked up a Changhong LT24630X LCD TV with an issue where the blue light would sometimes turn on, but at other times it wouldn't boot properly and couldn't be used normally. The user mentioned that the TV had been idle for more than a month.
The power supply voltages of 12V and 5V were measured and found to be normal.
The voltage at the first pin of the MOSFET power supply was measured as 5V, which was normal.
The voltages at pins 5, 6, 7, and 8 of the MOSFET were all measured at 0V, which was abnormal.
After shorting the MOSFET, the backlight turned on, but the boot was unstable.
The two memory chips, 25LC32 and 24C32, were removed and tested using a programmer. The data on the 25LC32 was normal, but the 24C32 was empty. Reprogramming the 24C32 did not work.
I replaced the 24C32 memory chip (using a DIP package instead of a surface mount) and burned the data downloaded from a forum.
After installation, the TV booted up normally.
Then I entered the factory mode adjustment screen by pressing the mute, menu, and 7217 buttons on the remote control.
The unit was fully reassembled and tested. Everything worked as expected, and the TV now functions correctly without any issues.
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