The TCL LCD TV model L32E5200BE has an issue where the power indicator light is on, but the standby button doesn’t respond. The power supply board shows a normal 3.3V and 24V output. To test further, the 24V output was forced to start separately. After checking, it was found that the 24V powers both the backlight board and the motherboard. A dummy load wasn’t connected to the backlight board during testing. When connecting the motherboard directly to the power line and pressing the power button, the light turned on. Pressing again turned it off, indicating the power board and motherboard are functioning properly.
The problem lies with the backlight board. Upon measuring the P3506DD component, a breakdown in the 18N20 field-effect transistor was detected. If no spare parts are available, replacing the entire backlight board is the best solution for repairing the TV.
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