TV partially black screen at startup

[johnpmt]

My 21" philips TV at home when switched on, starts with almost half of the screen (bottom half) blacked out. Then the black portion's height gradually reduces and after some hours i get to see a proper screen.
Please let me know that the problem could be.

Thanks
John.

[gary]

REPLACE ELECTROLYTIC CAPACITORS IN FRAME STAGE, WITH AGE THE CAPS FALL IN VALUE. AS THEY WARM UP THE VALUE WILL INCREASE.

[Pilsener]

Vertical output amplifier may also be faulty. Usually some TDAxxxx chip. Not very expensive thing.

[Guest]

Thanks a lot guys. will check it up...