Philips CM8833 makes tikking sound

By Argon

Paragon (1085)

Argon's picture

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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By Repair-Bas

Paragon (1075)

Repair-Bas's picture

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

By Alexey

Guardian (2444)

Alexey's picture

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.

By maxis

Champion (512)

maxis's picture

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.

By Argon

Paragon (1085)

Argon's picture

17-02-2018, 20:15

Okay, thanks guys

By Argon

Paragon (1085)

Argon's picture

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!

By Repair-Bas

Paragon (1075)

Repair-Bas's picture

20-04-2019, 10:01

No components needed.

By Argon

Paragon (1085)

Argon's picture

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.