Sony kdl-40ex500 no power

[Bob Neely]

I picked up this TV today from CL. He said he has been trying to fix it for the last 6 months. He tried replacing the power supply and it didn't fix it. He had a repair place look at it and they piggybacked a fuse onto the main fuse. (Kind of cheesy). That didn't fix it. He also gave the repair place the other power supply board and that main fuse was blown. They said it would be a signal board. (Not sure what a signal board is, maybe the main board???).

I plugged it in and there is nothing. No LED light on the front, no relay clicking. I am getting 170 vdc out of the bridge rectifier. I am also getting 3.3Vdc coming out of a couple of the pins and 2.7 vdc on the top right connector on the power supply.

I would like to verify that it is a main board before I spend the money. I will take pictures soon.

That is all I have for now.

Thanks for any help.

[Bob Neely]

Re: Sony kdl-40ex500 no power

here are some pictures of the power supply and the main board.

[Bob Neely]

Re: Sony kdl-40ex500 no power

I received a main board today and it didn't fix it. I did a closer look at the power supply and found C6332 charred. Can anybody help with the value of this capacitor and if there is another one on the board that is can use for this cap. I have another power supply that has the same problem. Thanks for any help.

PS: I need to apologize for the "cheesy" comment in post 1. I tried to replace the main fuse earlier and could not get the fuse out of the holder. I had to solder another fuse to the top of the old.

[NathanGJedi]

Re: Sony kdl-40ex500 no power

Same exact problem with the charred cap. Got a full rebuilt kit including the millipede-looking IC from ShopJimmy and shows NO power (before it would blow the fuse every time). Any ideas?