Philips CM8833 makes tikking sound

Door Argon

Paragon (1088)

afbeelding van Argon

17-02-2018, 09:07

Hey.

I just bought a CM8833, the monitor works great, but when powered on it makes some kind of tokking sound at a steady interval.
tok.. tok.. tok.. tok.. ...

Any ideas?

Thanks

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Van Repair-Bas

Paragon (1077)

afbeelding van Repair-Bas

17-02-2018, 18:39

It is your audio pcb in the monitor.
Easy to fix, but be carefull.
Discription ypu will find on bas-ditta.info

Van Alexey

Guardian (2578)

afbeelding van Alexey

17-02-2018, 18:45

It's a time-bomb! Wink The clock is ticking!

As Bas said, be careful with the monitor. The voltages there are far from being safe.

Van maxis

Champion (512)

afbeelding van maxis

17-02-2018, 19:58

Argon wrote:

Hey.

I just bought a CM8833, the monitor works great, but when powered on it makes some kind of tokking sound at a steady interval.
tok.. tok.. tok.. tok.. ...

Any ideas?

Thanks

The CRT shield must be grounded to the main board. If not, the charge will accumulate and discharge making the "tok" sound. Disconnect the speaker. If still persists - then it's the discharge. Otherwise the problem mentioned by Repair-Bas.
If there is a discharge, simply run the monitor in the dark, you will see it. One more thing - whenever you plan to probe anything inside, always work with just one hand.

Van Argon

Paragon (1088)

afbeelding van Argon

17-02-2018, 20:15

Okay, thanks guys

Van Argon

Paragon (1088)

afbeelding van Argon

18-04-2019, 14:03

I finally took the time to disassemble the monitor Smile
Indeed after disconnecting the speakers, the ticking sound is gone.

@Repair-Bas:
So if I understand correctlty from your document I should desolder the audio and TTL boards, check/reflow all soldering and put them back?
Do I need to check any specific components too?

Thanks!

Van Repair-Bas

Paragon (1077)

afbeelding van Repair-Bas

20-04-2019, 10:01

No components needed.

Van Argon

Paragon (1088)

afbeelding van Argon

20-04-2019, 15:58

Thanks Bas!
I just reflowed a lot of the soldering, put it back together and it works great again!

K.