Hi,
White line across the screen indicates that tv got vertical deflection failure problem that may be due to vertical output chip failure. If that kind of problem occurred, tv select protection mode and red light starts blinking 4 times.
Please check vertical output chip in tv main board and replace it to solve tv issue. This job needs soldering work so local tv repair shop will help you.
Thanks.
The blinking led indicates an error code, and a protection circuit within the TV has activated. The white line is clearly a vertical output issue and would be the result of a shorted IC (or an internal short on 1 or more of its pins) - replace this vertical output IC with same type number and pin configuration, and check all diodes capacitors and resistors around it - particularly near its supply input area.
Usually electrolytic capacitors are the main causes of IC failures as well as dry joints on the chips themselves. Leaky diodes can also cause trouble.
A good idea to check for dry solder joints too just to be sure.
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