UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Pye StudioCOLOUR (K35 chassis) No picture / sound

harvestgold · 16th Jan 2022, 1:05 pm

Thanks very much to Glyn, I have tried a replacement TDA3560 and also substituted the RGB and Luma/Chroma boards, the only difference being an increase in blue in the picture, but still only a dim blank raster with flyback lines and also no audio getting through. The brightness and contrast controls have no effect.

I’ve checked the marked test points on the main PCB and most are reasonably close to what is marked apart from:

Point by D583 should be 155v is 197v
Point on pin 10 of the connector to the RGB module, should be 155v is 195v
Point on C460, should be 285v is 314v

A couple of the 13v points seem a bit low; Pin 9 of the connector to the IF/ detector/AGC board, and R455 are 11.98v.

Any further thoughts would be most welcome.
Neil.

16th Jan 2022, 1:05 pm	#6
harvestgold Hexode Join Date: Jul 2005 Location: Worcestershire, UK. Posts: 282	Re: Pye StudioCOLOUR (K35 chassis) No picture / sound Thanks very much to Glyn, I have tried a replacement TDA3560 and also substituted the RGB and Luma/Chroma boards, the only difference being an increase in blue in the picture, but still only a dim blank raster with flyback lines and also no audio getting through. The brightness and contrast controls have no effect. I’ve checked the marked test points on the main PCB and most are reasonably close to what is marked apart from: Point by D583 should be 155v is 197v Point on pin 10 of the connector to the RGB module, should be 155v is 195v Point on C460, should be 285v is 314v A couple of the 13v points seem a bit low; Pin 9 of the connector to the IF/ detector/AGC board, and R455 are 11.98v. Any further thoughts would be most welcome. Neil.