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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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20th Feb 2020, 8:48 pm | #1 |
Hexode
Join Date: Jul 2004
Location: Paris, France
Posts: 346
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Help Needed with Sony KV1220DF
Good day Gentlemen,
I'm trying to help a french friend with a Sony KV-1220DF Trinitron colour TV. This is the Secam version of the 11 inch Trinitron sold from 1972 onwards. It is equivalent to the British KV-1220UB sold in England. The TV was in storage for 10 years + It was powered up with a Variac First pictures were OK, colour, scan size (see pix) The set has occasional V sync instability, pots were cleaned. After being used several times over the last 2 weeks, the TV has developed a severe H overscan issue (see pix). Turned off since for fear of failure in the H scan section. Also excessive brightness, retrace lines. Variable resistors on the P2 board : 819 line width and 625 line width have no action. The picture stays severely zoomed. Pots cleaned & checked, they are OK. I have advised the user to stay in 625 only & avoid switching to 819 to avoid stress on the H power stage. The series regulator on the P1 board outputs 115VDC, spot-on. Monitoring shows no drift. We have the complete Sony Service Manual (22Mb pdf) I can zoom sections & post screenshots if required. The owner has a 819/625 signal generator, SECAM colour bars & convergence crosshatch. TV is operating via UHF aerial input on 625 L standard SECAM signal. Digital multimeter & a new Owon digital scope (2 x 100 MHz) Is a Newbie to colour TV servicing. Any help appreciated to get Scan width & height back to normal, Thanks ! in advance for your suggestions, Best Regards jhalphen Paris/France Last edited by jhalphen; 20th Feb 2020 at 8:58 pm. |
20th Feb 2020, 8:53 pm | #2 |
Heptode
Join Date: Aug 2009
Location: Carshalton, Surrey, UK.
Posts: 734
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Re: Help Needed with Sony KV1220DF
Hi,
I never knew Sony made a multistandard Colour TV !
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Regards Peter B |