TCL LCD TV L32F2350 TV no light repair record

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TCL LCD TV L32F2350 TV no light repair record, maintenance process to see the icon.......

TCL LCD TV L32F2350 failure phenomenon: After the machine is powered on, the red light is on, press the power button to turn off the red light, connect the signal source to have sound, the screen is dull, and the squint (find angle) has a very dark image, which can roughly judge the whole machine: The switching power supply, main board, logic board, and LCD screen can all enter normal working conditions. No light goes straight to the backlight strip (light bead) and LED constant current source components.

After disassembling the machine, the power is tested for the constant current board. It is found that the +24 volt power supply is normal. At the instant of power-on, the output of the constant current board has a voltage value of +30V, and then slowly disappears...

The voltage of the self-provided constant current source is adjusted to +60V to supply two LED strips respectively, and the two strips can be lit. In this way, one confirms that the fault is determined as a constant current plate abnormality, and the second is to reduce the screen splitting. Unsafe procedure.

The rough measurement of the constant current plate shows the problem, and a detailed investigation - see the following picture:

After screening Q601 MOS soft breakdown, the road test is not allowed, take off the measurement. Replace the same type of MOS tube, see the picture below

After the Q601 is replaced, after the LED strip of the test machine is lit normally, the main voltage value is measured for reference.

3.5mm Wire To Board Connectors

3.5mm Wire To Board Connectors.Standards
Wire-to-board connectors carry approvals from various national and international organizations. In North America, they often bear marks from Underwriters Laboratories (UL) and/or the Canadian Standards Association (CSA).
A wire to board connector for the European marketplace should comply with the Restriction of Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment (WEEE) directives from the European Union (EU). Wire-to-board connectors that comply with other requirements are also available.
BS 9526 N0001 - Specification for multi-contact edge socket electrical connectors.

3.5mm Wire To Board Connectors

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