SONY KE-42TS2U can see menu but no picture

[okcmaestro]

Hi all,

After a lightning storm I have no picture on this TV. I can get the menu to show on the screen but it indicates that there is no signal into the TV even when i switch to any type input source. Any ideas on which parts i need to replace? I have never worked on a TV before but consider myself to be handy repairing things.

Thanks for all suggestions.

Mark

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

This fault is going to be on the main board.
Other things to check are other inputs, if you have for example tried only HDMI try analog inputs and vice versa.

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

I have tried several different input sources and all I tried would not provide a signal. I thought that may mean that I could replace a board that dealt with signal input and that might solve the issue.

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

Yes, the main board is what deals with the input signal.
Open the set up and take some pictures and we will help you locate the board.

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

I will get some pictures but it is going to take a couple of days, be back soon.

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

This is a picture with the back off. I guess you need me to take off the metal panel also?

Mark

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

Yes. I have never seen an LCD with a shield like that over the electronics! Is this a plasma HDTV?

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

Yes it is a 42" Flat Panel Color HDTV (Plasma WEGA™) Anything to be careful of when taking off the shield?

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

High voltage present inside -- make sure set is unplugged for at least 5 minutes before going further.

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

I have attached the photos.

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

Can we get a closer shot of these capacitors? They do not look healthy.

The problem is likely below the capacitors (main board assembly), however, the capacitors being bad could conceivably cause issues with the main board.

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

Yes those 4 seem to be bloated.

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

Hmm, they look OK to me. Bulging would be evident around the seal -- it would be leaking or broken.
So, can you easily remove that shield off the board below those capacitors? The main board is under there.

[truep]

Re: SONY KE-42TS2U can see menu but no picture

Those caps are bad. Replace them before going further. wouldn't hurt to replace all of them on that board.

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

How do I remove the caps? I have attached a photo after removing the other shield.

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

I'm of the opinion they're not bad, but if you want to swap them, you will need to use a soldering iron; heat each leg one after another, while gently pulling on the capacitor.
As far as the main board goes, is there a separate area for the video inputs? It looks like that just connects to them somewhere?

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

The inputs are on pictures 4 and 5.

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

Is there anything like a board under the input panel? Or just the jacks?

[okcmaestro]

Re: SONY KE-42TS2U can see menu but no picture

Here are photos of what is underneath.

[tom66]

Re: SONY KE-42TS2U can see menu but no picture

Right, so it looks to me like that board handles the various video inputs somewhat separately and then feeds it in to the main board below those mentioned capacitors. (Input multiplexing.)

It would be unlikely that all of the input multiplexing would fail at once, so I'm going to say that the fault most likely resides on the main board.