TV with weak colour
I have a late '80s vintage Philips CP110 Tv , which works well, but
the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! .. is this likely to be something like a low voltage to the RGB stage,or something more serious? -B |
TV with weak colour
In article
, b wrote: I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? What happens if you drive it with an RGB signal? -- *Always borrow money from pessimists - they don't expect it back * Dave Plowman London SW To e-mail, change noise into sound. |
TV with weak colour
"b" wrote in message ... I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? -B If the A1 control is set wrongly, some of the older CRT types can look 'washed out'. Sometimes, beam limiter problems can give the same effect. A fault in the ACC circuitry will do it, and sometimes, a mishapen sandcastle pulse, which used to be quite common back then. Often down to a resistor in the HOP stage, where the pulse is 'constructed', having gone high. Arfa |
TV with weak colour
On 30 dic 2008, 15:46, "Arfa Daily" wrote:
"b" wrote in message ... I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? -B If the A1 control is set wrongly, some of the older CRT types can look 'washed out'. Sometimes, beam limiter problems can give the same effect. A fault in the ACC circuitry will do it, and sometimes, a mishapen sandcastle pulse, which used to be quite common back then. Often down to a resistor in the HOP stage, where the pulse is 'constructed', having gone high. Arfa I finally dug this set out again today and it did seem as if the G2 was a bit high, so I lowered the SCREEN control slightly on the Line o/ p tranny and that gave a far more natural colour. Haven't tried it with RGB source, as didn't have one to hand. set seems fine now , cheers, B. |
TV with weak colour
"b" wrote in message ... On 30 dic 2008, 15:46, "Arfa Daily" wrote: "b" wrote in message ... I have a late '80s vintage Philips CP110 Tv , which works well, but the colour is weak, even with the saturation control set to full the picture is only just more 'colourful' than B&W! . is this likely to be something like a low voltage to the RGB stage,or something more serious? -B If the A1 control is set wrongly, some of the older CRT types can look 'washed out'. Sometimes, beam limiter problems can give the same effect. A fault in the ACC circuitry will do it, and sometimes, a mishapen sandcastle pulse, which used to be quite common back then. Often down to a resistor in the HOP stage, where the pulse is 'constructed', having gone high. Arfa I finally dug this set out again today and it did seem as if the G2 was a bit high, so I lowered the SCREEN control slightly on the Line o/ p tranny and that gave a far more natural colour. Haven't tried it with RGB source, as didn't have one to hand. set seems fine now , cheers, B. I'm not familiar with the model - and slightly out of touch with TVs in general - but having considerable experience in TV service in the distant past, I can tell you that colour saturation has nothing to do with A1 or A2 controls - which only affect brightness or 'grey-scale' settings. Look for the chrominance amplifier circuitry, that is where the problem is likely to be. |
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