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
What happens if you drive it with an RGB signal?
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*Always borrow money from pessimists - they don\'t expect it back *
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
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
Let's see you say it works WELL but has no/little color?
Get service literature with voltage and video/chroma waveform test points. Get a DVM and a scope. It's not likely that you'll find the problem without these basic tools unless you want to heat and cool components while the set is on the bench live.
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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