Approx 1 hr after switch on, the right side of screen flickers and shortly after this a vertical band of approx 5cm appears. The colour of this band varies with the dominant screen colour of the moment.Have had set with local engineers who found that on removal of back of set the problem does not appear, however on taking same home the problem reappears as above. The set is a Phillips 26" lcd PF9946
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1.In this case the problem is usually found in the high voltage power supply.Most probably is the vertical IC defect. Warning : This procedure has to be done by an expert.It is risky and can cause death to those who dont have knowledge in repairing. A.) Open the unit and try adjusting the screen variable found in the flyback transformer. Notice any pattern on the screen of your tv.If their is a horizontal white line on the screen the defect is the vertical IC,replacing it can remedy the problem. Also check the 24v supply of the vertical IC coming from the flyback transformer.If their is no 24v get the resistance of the fuseable resistor and rectifier diode.Usually the resistor opens and the diode create short circuit. B.)For most, make sure that their is no loss contact or cold solder on the board.
Sounds like the red picture tube could be shorting internally which would cause the "all red" condition. In which case you'd have to replace the red tube. Are there horizontal (slightly slanted) lines through the picture as well when this is happening and a very very bright screen? If so it's most likely the tube.
I would suggest to locate a part that looks like the one on this link and re solder all the pins, also check for any high power resistor nearby the IC295890 and put some fresh solder.
Let me know if you need further assistance.
The vertical height driver that controls the height of your picture has weakened and needs to be adjusted. If you are somewhat handy you can do this yourself. It requires that you gain access to back of the set & remove the cover. Once removed, locate the vertical height & centering adjustments. Sometimes they are located on the main board & other times are located on the color gun driver circuit board that is plugged into the end of the picture tube.
Respond to this post if you need additional assistance. Good luck!
You have what sounds like a failing vertical output IC also could be some bad capacitors. If you are able to solder it would cost a few dollars to try this and see if it fixes it. If not you would need to replace the whole board itself and that could cost you a little bit more money. If you need a tech it is time to get rid of it you are looking at at least 200 dollars for repair.