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If it is a horizontal line in the middle then it is possibly an IC which is responsible for the vertical scanning or the supply source to the IC. Please remember that the auto-shut function in the power supply prevent the screen from further damage. And if the line is vertical then it is a simple fault and all you need is to re-solder one spot related to the malfunction.
You can try a hard reset: Unplug TV from AC mains and remove all cables from TV. Wait about 30 minutes and replug to AC power and redo the cabling. Switch on the TV and see if it works..And check if your facing when playing DVD ...
Bad vertical deflection circuit, unless you have a bad connection (bang on set to set it it fills out for a second) . you will need components replaced such as the IC, capacitors possibly a fuse from the power source to the vertical IC.
If its a bad connection soldering the IC pins is not to hard if you are OK with taking it apart yourself.
This TV has lost it's vertical deflection. When all the TV x-rays are concentrated in a single horizontal line, the TV power shuts off automatically due to the built in X-ray safety device. When the vertical deflection IC burns out, it usually takes part of the circuit board with it. It will not be an easy repair. A 500+ dollar repair at the least, involving finding the burnt out components and replacing them.
Will not power, led blinking
check R640 (1K 1/4w) if open replace ic600 (8-759-670-30)
Standby led blinks slowly, a few times, chassis won't start up
I changed the vertical deflection ic type TDA8170 and I measured two
leaky capacitors in the power supply. Better to change all 4 capacitors
in the power unit, everything was then ok !