DIYbanter - Philips 27PS60S no color on certain channels

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Cryopaul

August 25th 03 04:55 AM

Philips 27PS60S no color on certain channels

On certain channels, the color will goto B&W. Turning the tv off for a minute
or so will remedy the problem as will changing the channel back and forth. The
tv is about two years old and the problem has always been there, but has never
been an issue since I used to use a digital cable box to change the channels.

Paul

TV Fixer1

August 26th 03 06:40 AM

Philips 27PS60S no color on certain channels

Could be a bad color osc crystal...3.58Mhz

H. R. Bob Hofmann

August 27th 03 05:26 PM

Philips 27PS60S no color on certain channels

(Cryopaul) wrote in message ...
On certain channels, the color will goto B&W. Turning the tv off for a minute
or so will remedy the problem as will changing the channel back and forth. The
tv is about two years old and the problem has always been there, but has never
been an issue since I used to use a digital cable box to change the channels.

Paul

It could be that the signal level across the bandwidth of the channels
is very skewed, ie, not flat across the channel, thus confusing the
circuit that detects the color burst on the back porch of the
horizontal sync pulse into thinking that the transmission is B+W. Is
it always the same channels that are flaky, and from any signal
source? There may be some non-linearities in the cables from whatever
source into the tv set that are causing these "drop-outs" in the
cables response across the band. Moving the interconnecting cables
while watching the tv might uncover this type of problem. Replacing
the interconnecting cables with a different type of cable might also
show some results.

H. R. (Bob) Hofmann

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