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Sounds like a power pack issue. Might be the switch mode transistor not working correctly. Either try repairing it or take it to a local tv repair centre
Possible that this is a protection shut down that show up. The processor does not switch the main +B as there are errors in the main board. So remove power plug and look for possible visible damage on the board for leaked capacitors.
if so there is short on the board and so there is no feedback to the processor and so is shut down. use a multimeter to check for shorts in circuit.
The first problem was always standby mode.... get back the original eprom IC 24CO8WP in to the PCB, then find the original remote control of you TCL Tv tcl-14175 then you power On In the Remote control while your TV is in Standby mode! then you see your tv is going ON... Because your unit is in Child lock Mode....
What year? Describe in detail the problem.
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