Wei-Ya C3129 "Chirping sound"

[Machaqs]

Working on a Wei-Ya C3129DHSS monitor board out of a Golden Tee Live. The board makes a soft "chirping sound". It sounds like a relay. Anyone have any ideas?

[lilshawn]

The chassis in all monitors are getting pretty old and tired.

The sound you hear is the sound of the switching FET in the power supply attempting to start up. it's failing to start because the FET has an overload protection built into it.

The capacitors are dried out and being an extra load. the load is too much for the FET and and power supply shuts down. it waits a little bit and attempts to start again. over and over.

dweet dweet dweet dweet. or chick chick chick chick. or wub wub wub wub. all kinds of different sounds from different FET manufacturers. sometimes fast, sometimes slow.

but yeah, you'll need to replace the capacitors on the chassis with some new ones. basically all the bigger electrolytic capacitors... don't worry about the little tiny ones or the plastic dipped ones.

[ed12]

and as that is rick's chassic
i sujest u replace the  startup cap >slow start<
with a larger :mf: value..not voltage but :mf:
i do think they used a 4.7mf so 10 is sold..but DO NOT UP THE VOLTAGE OF THE CAP
ed

[lilshawn]

and as that is rick's chassic
i sujest u replace the  startup cap >slow start<
with a larger :mf: value..not voltage but :mf:
i do think they used a 4.7mf so 10 is sold..but DO NOT UP THE VOLTAGE OF THE CAP
ed

the C15 should already be a 100uf cap which should be plenty to get these things started.

you basically want to replace all the caps bundled around the yellow transformer.  get same uf rating, maybe slightly higher voltage if you can. But watch your spacing. they are packed pretty tight, and a 1000uf 50 volt cap may not fit in a 35 volt cap space.

[Machaqs]

Thanks...I'll try what was recommended then repost later...

[Rickn]

Just to clarify, that is not our board! Suspect Horizontal output, caps on the supply to the horizontal output? Yes may be the fet or caps around is as well as transistors in the power supply that switch the B+ depending on frequency.
Good luck Rick