ringing sound in the monitor

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bonito

New Member
hello! my monitor which i'm troubleshooting has a ringing sound. the brand is AOC and the moel is 4Vn. i'm currently finding the defect now but if you can help me it with be a great! by the way i'm working here as a computer technician in a university. thanks alot!
 
Hmmm.. Usually that's either a bad capacitor or the flyback transformer. You can try setting it at a lower resolution with a higher refresh rate and see if that helps. If it does it will only be temporary.
 
Unfortunately besides the link for the schematic at the "service manual"? link the only other site besides downloading drivers was an RMA support form for online tech support seen at http://www.aocdisplay.com/support_rma_register.html

You could try submitting a support request directly outlining the problems being seen. But it sounds more like the monitor itself may have to be serviced directly by someone who works primarily on them or replaced.
 
Well, I told you what was most likely wrong with it. I can also tell you you should never attempt repairs on a monitor yourself, and for what they are worth they are not worth fixing.

I have to ask though. I used to have an AOC monitor about 11 or 12 years ago on a 386DX16. It was cheap. It was a bubble. It had crappy resolution.. But it worked. Where on earth did you find one? Are they even still in business?
 
thanks a lot guys..i will try all your advices..when i turn it on, it has no display of computer booting up..and the ringing sound keeps on going..i read books about it and its called horizontal ringing but i can't pinpoint which part of the horizontal section..you know, here in the philippines, we do not do away any appliances..if it is serviceable, we still go for servicing.
 
here in the philippines, there's still a lot of people that uses AOC color monitors. i think you can find here mr. sirkenin..in fact, there's still many internet cafes that use it..here in the university where i work, we use now LG..but there's still old monitors that we use in the computer laboratory..we can't do them away..because the school is having osterity measures..that's why if it can be fixed we fied it
 
Once a monitor becomes too faulty to repair it also becomes an electrical hazard. If you are fortunate it will simply quit doing anything. But at this time if it can even be saved it will have to have professional repair. Once any electrical appliance is too far worn there can only be one simple word of advice which is "Get Rid of it!". It has outlived any real use at this time.
 
we'll thanks for the advice mr. PCeye..but, that's what i'm here for in this school, to repair defective computers and other peripherals..but i'll do your advice if it can't be solve.
 
Both problems can be solved. Capacitors can be tested and replaced no problem. The problem with the flybacks is the seal on them. It goes and you have to replace the seal. Just be VERY damn careful with it. That thing carries 20 to 30,000 volts and it will send you across the room in a real quick hurry.
 
now your talking SirKenin! i will let it go now..i don't want to be shocked with that amount of voltage..it sure DAMN when it happens to me..thanks a lot.
 
Why do you think there are so few places that service monitors to begin with? Depending on the age and amount of use over the years there are other things that can quit at anytime. Plus you have to consider the internal wiring as well as the cathode ray tube.

A good number of techs wear rubber gloves and cross the contacts on capacitors with a screw driver or other long metal item to discharge those before handling. All you can do is use caution there.
 
bonito said:
hello! my monitor which i'm troubleshooting has a ringing sound. the brand is AOC and the moel is 4Vn. i'm currently finding the defect now but if you can help me it with be a great! by the way i'm working here as a computer technician in a university. thanks alot!
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Opening your monitor is risky, lots of static discharges on the tube even when unplugged, there might even be tube implosion.
 
The monitor doesn't discharge when it's unplugged. You knock that yolk and you're in for a treat. Try touching the business end of the Anode connection.. heh.
 
bonito said:
we'll thanks a lot guys..by now, you already convinced me..i'll close it now and condemn it.
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You are probably going to be the better off instead of seeing a mishap with it. Besides the shock hazard of working inside one you would have to also be worry about a possible fire hazard if something overheats. You don't want anything bad happening there.
 
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