The TV was locked  “showed a red lock in the right corner ” the Tv also had oversize picture and the showed no color.

Repair: Remove of lock ,   PCB had components was badly soldered by a previous repairer.  Resolder joints replace crystal and HEF4053.

TV In good working order.

If you want to know how to remove the lock here is the link

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Sinotech 54 cm tv