Tick tick sound appear from acer 15" crt monitor power supply circuit

If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
Check the cables, connectors and connections.
Take it to a repair shop.

There is some shorted component/s in the circuit board. The short circuit protection circuit detects this short, and shuts down your TV again and again. That is why you hear these 'tick' sounds repeatedly. Contact any experienced service technician to get your TV repaired. The work is skilled one, which need sound knowledge in electronics, and work experience.

A tick-tick sound is the shutdown circuit is engaged---on standard sets it usually means a short in the deflection circuit or the power supply.

Possible fault is A) blown LopT driver transistor, B) some of the rectifying Diodes in Power supply is short or open, thus not suplying needed voltage to circuitry. Also check all electrolytic capacitors in PSU circiuit & around Lop T. If any of them is geting hot or olstic cover is cracking or shrinking , or capacitor is bulginh\g on top.... Replace.

Hello,

TVs and monitors usually incorporate some kind of startup circuit to provide drive to the horizontal output transistor (HOT) until the flyback power supply is running. Yes, TVs and monitors boot just like computers.

There are two typical kinds of symptoms: power on click but nothing else happens or a tick-tick-tick sound indicating cycling of the low voltage (line regulator) but lack of startup horizontal drive.

Check the voltage on the horizontal output transistor (HOT). If no voltage is present, there may be a blown fuse or open fusable resistor - and probably a shorted HOT.

However, if the voltage is normal (or high) - usually 100-150 V, then there is likely a problem with the startup circuit not providing initial base drive to the HOT.

The startup circuits may take several forms:

Discrete multivibrator or other simple transistor circuit to provide base drive to the HOT.

IC which is part of deflection chain powered off of a voltage divider or transformer.

Other type of circuit which operates off of the line which provides some kind of drive to the HOT.

The startup circuit may operate off of the standby power supply or voltage derived from non-isolated input. Be careful - of course, use an isolation transformer whenever working on TVs and especially for power supply problems.

Note that one common way of verifying that this is a startup problem is to inject a 15 kHz signal directly into the HOT base or driver circuit (just for a second or two). If the TV then starts up and continues to run, you know that it is a startup problem. However, this is a risky procedure for both you and the TV.

I have also seen startup circuits that were designed to fail. Turning the TV on and off multiple times would exceed the power ratings of the components in the startup circuit. Some Zenith models have this 'feature'.

When this situation exists, it could be that the circuit is not providing the proper drive or that due to some other circuit condition, the drive is not always sufficient to get the secondary supplies going to the point that the normal circuits take over.

You can still check for bad connections - prod the circuit board with an insulated stick when the problem reoccurs.

circuit diagrams exist at the factory where they were designed. Though I have looked before they cannot be found. I do not believe they exist.

i have the same thing, monitor display is dark and tick tick sound audible and thats all it do untill now..

we've got same problem sir, my 5 crt monitor are like that, i brought the one to the electronic shop, and it's an IC problem. the longest IC. i dont know the name

Make sure the mains plug is firmly inserted. The most likely cause of the problem is a power supply problem which will be uneconomical to repair in the current day. Cheaper to replace with an LCD.

this is due to the abnormal 5v supply to micom.check upthe 5v line.