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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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27th Oct 2019, 11:49 am | #1 |
Hexode
Join Date: Jun 2018
Location: Cambridge, Cambridgeshire, UK.
Posts: 260
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Sony KV-32FX60U
Before I send this old trinitron to the skip I thought it worth seeking ideas in case there's a simple fix.
This set has been showing faint flyback lines for some time and picture is not as bright as it was but the main problem that has occurred is that for the first 15mins the picture brightness and colour is unstable. It is fine one moment then suddenly goes bright white or red or blue (never green). After a couple of seconds it then achieves correct operation for a short while (perhaps 10 seconds or so). It seems to lose lock mostly at picture content changes but not always, and the problem reduces over time and stabilizes completely after about 15 mins. I wondered if this is something to do with locking to the colour burst. I'm feeding it from a set-top box but it is not the fault of the box as I've tried an alternative. |
28th Oct 2019, 2:58 am | #2 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,184
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Re: Sony KV-32FX60U
Together with the faint flyback lines, this seems more like a drive or tube issue to me then a decoder issue. If no loose contacts around the CRT socket are found, nor in the G2 or focus circuits, I would suspect the tube.
A couple of pictures could also shed some more light on this problem. |
28th Oct 2019, 1:26 pm | #3 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,884
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Re: Sony KV-32FX60U
I tend to agree. Though as the 32" Trinitron tube is quite reliable it would be worth checking the A1 (G2) setting and adjusting it slightly when cold to get rid of the flyback lines. However, dry joints are extremely common on the RGB transistors on the CRT base so before doing anything I'd resolder these and you may find the fault disappears.
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28th Oct 2019, 9:43 pm | #4 |
Hexode
Join Date: Jun 2018
Location: Cambridge, Cambridgeshire, UK.
Posts: 260
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Re: Sony KV-32FX60U
Thank you both for your replies. After hoovering out all the dust this set now works again! the flyback lines remain so, Welsh anorack, as I don't have the service documantation where will I find the A1 (G2) adjustment?
Chris |
28th Oct 2019, 10:12 pm | #5 |
Dekatron
Join Date: Aug 2006
Location: Madrid, Spain / Wirral, UK
Posts: 7,484
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Re: Sony KV-32FX60U
It's a Sony - so resolder, resolder and resolder some more. Check the tube base panel, consider removing and refitting it to give the CRT pins a clean.
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Regards, Ben. |