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Help - Philips CM8833 fading in and out

Posted: Fri Jun 29, 2018 10:10 pm
by steve3000
My trusty Philips CM8833 has developed an intermittent fault - the picture, which is pretty much perfect, randomly fades to black after using for a while (usually between about 20 minutes and an hour's use).

When the screen fades out, if I peak through the back grill of the monitor, I can see the orange light from the electron gun fades out in time with the picture. If I tap the monitor case, the picture sometimes fades back in briefly, but usually fades out again shortly after...

So loose connection or dry joint perhaps? Any likely places I should check first?

Re: Help - Philips CM8833 fading in and out

Posted: Fri Jun 29, 2018 10:52 pm
by 1024MAK
If the glow at the rear of the tube is going dim or out, that is the cathode heater. It is most likely a dry joint somewhere in the circuit.

Mark

Re: Help - Philips CM8833 fading in and out

Posted: Tue Jul 03, 2018 5:13 pm
by steve3000
Hey, thanks Mark. I'm planning on taking a look this weekend, will have the soldering iron on standby :)