Screen still goes black after the PSU board was changed?

I have a Polaroid TLA-01511c flat screen LCD 15" tv. The Polaroid logo comes on and then the channel indicator and then the picture comes on for about 10 seconds and then goes black. I can see the picture when I shine a flashlight on the screen. I have replaced the two 1000 uf caps on the main board which didn't change anything. Which of the two circuit boards would I have to replace? There are 7 470 uf caps on the main board some of which have slightly bulged tops.

The above is the first question I sent. Since then I have replaced the power supply circuit board which had no effect. The problem is still there. The caps on the digital board all look ok-none of them are bulged. What else should I look for? Where caqn I find a schematic diagram for this set?