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Its main system control chroma jungle IC is faulty. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
This problem is either the TV's software or how the mainboard is distributing power so instead of just unplugging the TV, try a power drain:
1. Unplug the product's power cable so the device is not grounded to the house.
2. Press and HOLD the product's own power button for 1 minute to drain the capacitors.
3. Plug the product back into a wall outlet and try to turn it on.
Note: This procedure works with battery operated devices as well so remove the batteries and
hold down it's power/on-off button. Electricity can remain in capacitors and on circuit boards
enough to prevent normal functionality. By clearing the residue electricity, your product
will have a fresh start and many times this will resolve a buggy or non-responsive device
that appears to be dead.
Since hardware either works or it doesn't, your issue is either software or power related since you can get it to work so hopefully the power drain will indicate further.
a lot of times when a set is dropped the printed circuit board gets cracked, the only way to tell is to remove the back and printed circuit board and check; if not too badly damaged can be 'hard wired' across breaks and fixed
We had the same problem, for the same model of Toshiba TV. Had it repaired yesterday. Turns out the problem was the power supply (P.C.B).
The total cost was $192.66 Canadian funds (taxes and labour all in). Our model was 6 years old, buts its playing like a brand new unit now. Hope this helped ...... Good luck
when you say flickering??? are you saying the screen goes black and comes back on?? does the sound go out at the same time and comes bag on with the pic ? Is the sound there when this happens but is distorted. Is the pic blacked out or is it greying out with lines and twisting?? Need more info please as if its blacking out and the sound goes with it it may be going into shutdown. If the pic is getting kinda greyish with it twisting and the sound is there and ditorted then the tuner could be bad