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kermit315
Joined: 03 Mar 2008
Posts: 6
Location: Pt Mugu, CA
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 Posted: Mon Mar 03, 2008 8:41 pm Post subject: Sony KV-35S42 audio but no picture |
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Sony KV-35S42
Chassis AA-2d
The tv was running, then the picture scrunched up to the top of the screen, then disappeared. Sometimes the stand by timer light blinks when it does this, sometimes not. I have found that sometimes if I unplug the set while it is blinking and immediately plug it back in, it will give me a screen.
I have no pictures, and dont see anything burned in the back. When I have a screen, it is beautiful, but then it will go away. I am an electronics tech in the Navy, but work on aircraft, not TV's, so any little bit will help, including any schematics anybody might have.
Thanks,
Jamie |
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kuhurdler
Joined: 28 Dec 2006
Posts: 2582
Location: Overland Park, KS
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| Posted: Mon Mar 03, 2008 10:45 pm Post subject: |
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| I think your tube is dying. see if it stays on if you turn the screen voltage up slightly. |
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silv
Joined: 07 Jun 2007
Posts: 57
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| Posted: Tue Mar 04, 2008 7:22 pm Post subject: Re: Sony KV-35S42 audio but no picture |
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| check for cold solders around the vert and also around the horizontal, and all caps, |
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kermit315
Joined: 03 Mar 2008
Posts: 6
Location: Pt Mugu, CA
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| Posted: Fri Mar 07, 2008 8:30 pm Post subject: |
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| Where would I turn up the voltage on this thing. I dont have any schematics to follow on. |
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kuhurdler
Joined: 28 Dec 2006
Posts: 2582
Location: Overland Park, KS
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| Posted: Fri Mar 07, 2008 11:39 pm Post subject: |
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| screen voltage is likely on the flyback transformer. the big black thing with the big red wire coming out. |
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kermit315
Joined: 03 Mar 2008
Posts: 6
Location: Pt Mugu, CA
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| Posted: Sun Mar 09, 2008 8:46 pm Post subject: |
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I found an adjustment labeled screen on the back of the flyback. I turned it up ever so slightly and just got lines across the screen. i turned it up more and the TV just shut off. No improvement.
How can I get the HV lines off of the flyback without juicing myself? is there a release mechanism or just brute force? is there an easy way to get the circuit board out so I can check solder joints? |
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kuhurdler
Joined: 28 Dec 2006
Posts: 2582
Location: Overland Park, KS
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| Posted: Sun Mar 09, 2008 9:01 pm Post subject: |
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you have to back the screen voltage off until the retrace lines no longer show. If at that point your TV is still flickering, then your sony TV has decided your picture is not optimal enough quality and is set to disable the picture. Basically your CRT is worn out.
I've always disliked that Sony had the say over whether my picture was good enough or not show.
You can try rejuvenating the tube, but it usually doesn't last very long on those sonys. |
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kermit315
Joined: 03 Mar 2008
Posts: 6
Location: Pt Mugu, CA
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| Posted: Sun Mar 09, 2008 9:26 pm Post subject: |
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| how would I go about doing that? |
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kuhurdler
Joined: 28 Dec 2006
Posts: 2582
Location: Overland Park, KS
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| Posted: Mon Mar 10, 2008 6:06 am Post subject: |
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The rejuvenating? You'd have to find someone that has a machine. I have one, and any good TV shop would have one.
But, like I said, it likely won't last very long. |
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kermit315
Joined: 03 Mar 2008
Posts: 6
Location: Pt Mugu, CA
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| Posted: Mon Mar 10, 2008 10:32 pm Post subject: |
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Thanks for the info. Sounds like its a gonner.
Jamie |
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