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| Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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26th Sep 2019, 1:13 pm
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#1 |
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Retired Dormant Member
Join Date: Sep 2019
Location: Birmingham, West Midlands, UK.
Posts: 2
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Sony tv 9-90ub, picture below top of screen
Hi all, this is my first post! I have this set working with a composite video signal using the buffer circuit from Billicar back in 2015. However the picture top is below by about 3/4 inch from top of screen and will not move up. It is squashed and the height control only pushes the bottom down and off the screen. Can anyone help, I have a circuit diagram. Thanks, Stuart
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26th Sep 2019, 2:17 pm
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#2 |
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Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,927
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Re: Sony tv 9-90ub, picture below top of screen
The answer is likely to be a capacitor. I don't have the manual to hand, but look at the decoupling on the boosted supply rail.
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26th Sep 2019, 3:40 pm
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#3 |
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Retired Dormant Member
Join Date: Sep 2019
Location: Birmingham, West Midlands, UK.
Posts: 2
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Re: Sony tv 9-90ub, picture below top of screen
Hi, thanks, I'll change most/all of the caps! Stuart
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26th Sep 2019, 3:42 pm
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#4 |
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Octode
Join Date: May 2011
Location: Lancashire, UK.
Posts: 1,351
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Re: Sony tv 9-90ub, picture below top of screen
This is what in an audio amp would be the 'bootstrap' cap, typically a 220uF (that sort of ballpark) cap that connects from the frame output back to the driver stages of the output amplifier.
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