The picture disappears when the Hitachi 42PD6600 TV is on, if I bang the back of the TV fairly hard it comes on again, it may stay good all evening or the picture disappear again and it requires another bang
Is this a dry joint of some sort or other problem?
I have the same problem too with mine, so far I have not been able to find anything about it.
This site claims to be able to help you, though for a price.
http://www.justanswer.com/questions/1xl9v-my-hitachi-42pd6600-a-has-stopped-working-at-first-it-appeared
Let us know if you get an answer?
andrew_mackie[at]exit2000.co.uk