I have a samsung tv model ln40b530p7nxza that wont turn on the standby light stays on solid and when i hit the button nothing happens i have replaced to main board and power supply board it is not a bad capacitor so whats wrong with my tv?

SOURCE: Optoma 719, can't get lamp and fan to turn on.

There is a stuffed 10v 3300uf capacitor on the power board. You need to replace it.
Bellow you can check in the picture where the capacitor is located.

Notice that in this picture I have already took the bad capacitor out and replaced with two small cords to reach the bottom and test the new capacitor.
To reach this place is not fast, several layers of plastic and metal must be removed, but is not a hard task to take the capacitor out and replace it for another.
It works just great! Now it is back on track with awesome image.

SOURCE: SSP-R4232 Plasma TV, blue light on, but tv wont turn on.

At this point it appears that your main board is probably bad. You most likely have a 5 volt scource going to the main board but its not powering up the set. The main board is part number BN94-00796A.
You might want to have a technician look at the TV to verify this as the issue before purchasing it. Please take a few moments to rate my answer. Thank you.

Testimonial: "I was extremely grateful to have a response in such a short amount of time, as soon as I replace the part that was suggested as bad to me, Ill post."

SOURCE: Samsung model LNT5271f excessive relay cycling before full power

Howdy,
Yes, it is very easy to repair. Solder iron wattage should be at least 300 w.

The PSB is the center Board (towards left) after you remove the back off the TV. Remove the shield that covers the Boards and remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.

Good Luck, big IRISH.

Testimonial: "Great fix"

SOURCE: tla-04641c wont power standby light comes on and

Hey listen bulldog, I am just having the same problem! Exact same thing, standy led on, power supply and boards seem like new, but tv doesnt power up! I read a schematic at http://www.polaroidsupport.com/polaroid/docs/TLA-04011C_TLXB-4011_TLXB-4241_ServiceManual_20070613.pdf and if you follow it through it states, to change the control box!! I have fair confidence that I can replace the control box because I have experience in soldering and have built my own computers before as also swapping major components in laptops as well! So I am willing to take the risk to fix this but heres the problem!! I dont know where or what the control box is or where to go to buy a new one! POLAROID customer service is aweful, unless you know the manufacturing plant and can go there, they wont be much help! I hope this info helps you, if you got the problem fixed can you tell me what you did or where I can look to get my issue resolved! Need anything else just post here!

SOURCE: I have a Hitachi P50H401 plasma TV ,when you hit

unplug the unit for a while like one hour or so.