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Re: Bad Picture quality when AC powered
Based on your post/description, your power supply is faulty. 1. It your 24VAC adapter/power supply is the original one that came with the camera, then most likely a component failure inside. More often it is the filter capacitor. 2. If it is a replacement, then possibly the ratings are not compatible with the camera, specifically the current or power (Amps or Watts). 3. In some instances the built-in regulator might be shot since your source is 24 but your load rewuires only 12.
Hope this be of some help/idea. Post back how things turned out or should you need additional information.
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First check the power supply, make sure you are over 12vdc or 24vac depending on your source with all cameras connected. Try only one camera connected to the power supply. Make sure you have the positive and negative connected correctly. If the power is good the cameras may be bad.
Close examination of your power supply may reveal if the psu is bad.
When the power supply is plug in ac socket the green indicator led inside the motherboard will lit steady green. See if by turning on the cpu you will see some sparks in the power supply connector attached to the motherboard. This is a clear indication of a bad or shorted psu.
You can also smell if there is a burning inside the psu.
See if the fan inside the psu is working if not then its a clear indication of a bad psu.
Using a multimeter if you have one measure the dc voltage coming from the supply connector. Insert the black probe to one of the black wires in the connector. And the red probe to the red wire in the connector. the reading should be +12VDC. Put the red probe to the red wire and it should read +5VDC. Any readings below this, means bad psu.
Measure also the output voltage when there is a load in the power supply. Connect a CD-ROM drive or hardisk and measure again the voltage. Dropping of voltage when put some loads is a clear indication of a bad power supply unit (psu).
I hope this will help you. Thank you for using Fixya!
First palce to look will be the power supply, look for bad caps with bulging tops, make some voltage checking at the power supply output connectors also, it should have 5vdc (for logic circuits), 12vdc ( for sound and mics circuits), 24vdc for back light inverter.
This camera can operate on two voltages, either 12VDC or 24VAC. If you are using 1 or 2 of these the most practical and economical approach is to use a power transformer that is rated at 24VAC40VA. Theses transformers can be purchased at most electrical supply stores for less than $15.00. If you are using multiple cameras it is normally best to purchase a single power supply. One manufacturer who makes a decent power supply is Altronics. You can get these in either 12VDC or 24VAC power configuration.
This sounds like CCD sensor problem ( especially if the picture is "noisy" ). Canon and Sony fixes this particular problem free of charge since the CCD device installed in your camera should last + - 15 years if it is properly manufactured. Contact your agent and find out what their policy is.
1. Make sure the AC power source is ok.
2. Make sure the AC power cord is good with no damage.
3. Look to see if there is a reset button on the rear of the set. If not, then look for a blown AC fuse inside the set.
Since the set works fine on +12VDC, the majority of the TV set is ok. You have a problem in the AC power supply. It could be a blown fuse, bad rectifier / regulator, bad step-down transformer.
The TV typically runs from +12VDC. The AC supply steps-down the 120VAC and rectifies it into +12VDC to power the TV. At some point in the TV, there is junction point where the +12VDC from the sets internal AC supply meets the external +12VDC power source. Usually they are electrically isolated from each other with a switch or with diodes.
Please let me know if I can be of further assistance to you.