The TV is on protect mode.
You already did the first two steps of troubleshooting:
- Leaving the TV power cord unplugged for some times, at least one hour or so.
- Ensuring that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.
If that did not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.
The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.
1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.
2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.
If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.
If you are in situation 2 , then there is an internal fault.
Common faults that can occur are a blown capacitor on power board, a convergence IC has blown, or a fault on Digital board.
You are in situation 2 , then the TV is faulty.
If under warranty contact the manufacturer ringing the number on the user manual
If you want to repair at your own expenses, just locate any good qualified repairer.
If you are a technician and you want to DIY, start testing the PSU , convergence board and ballast.
If problem is not there , then get the service manual to test digital board and optical group.
you can find service manual here:
MITSUBISHI VS-45603 VS-50603 VS-60603 VS-50604 SERVICE MANUAL .