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I have an Avtech AVC783 stand alone DVR. It has a start up fault - when the power is connected it beeps twice per second & relay is clicking too. I suspect a power surge or power management area problem in the circuitry. Power supply is DC12-18V. I would like help on fault identification from tech experienced with DVR's. The repair options please.

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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trintek
  • 111 Answers

SOURCE: Sony Trinitron Power Surge 5 Blinks

once you have diagnosed the problem, the following link is to all parts for your tv stocked at partstore. they generally have better prices than the dealers and repair shops.
KV-36fs13 parts

you can try the dead-tv kit from fixyourowntv if you have some basic experience with soldering and circuit repair.
http://fixyourowntv.com/orderpage.php

Five blinks means, "IK (AKB)" (white balance). The probable causes listed by Sony are as follows:
1) Video OUT (IC561) is faulty (A board)
2) IC355 is faulty (A board)
3) Screen (G2) is improperly adjusted.

not sure what the 13 blinks are for.

hope this helps,
trin

Posted on Nov 19, 2007

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  • 2318 Answers

SOURCE: where do I buy parts for gateway fpd1960

I'm sorry to say that in today's electronics devices, there is not much support anymore when It comes to service parts.
In many cases the same boards have to be fixed if you want that device to be functional again.

Posted on Mar 03, 2008

  • 142 Answers

SOURCE: Power On + red LED turns on + but final relay (click) don't come so no sound

Your audio output transistors are shorted and your unit is staying in "protect " mode to protect your speakers from 40 to 60 volts that is being sent at them from the shorted outputs. If you can use a meter you won't need the schematic MOST likely because the outputs are USUALLY the only parts that short out. The output transistors( or chip ) are mounted to the large, finned heatsink. The #'s on the transistors start with "2SA-" and "2SC-" followed by numbers. There are two output transistors per channel. If your unit uses an IC for audio output then the # on the IC will be "STK-" followed by numbers. These parts are available from tritronicsinc.com. Good Luck!

barneyluc

Posted on Oct 17, 2008

hbsurfdawg
  • 95 Answers

SOURCE: Won't turn on - relay clicks, power supply squeals, relay clicks, etc,

The television has a protection circuit. Sound like you know something about electronics so that is cool.

I suspect the HOT or High Voltage Transformer. If you want to operate on it, they typically will short externally from moisture or plastic high voltage breakdown. The TV starts, shorts as it cannot come to full high voltage, then shuts down. If your brave, you can unsolder the HOT which is the part that is on the main board or that comes from the top of the picture tube wire into a dark or spaceship type object.look underneath, sometimes they short underneath and you can scrap the carbon and get it to at least start up and work. Do not leave this as a fix as it can be a fire hazard.


The HOT is the most common. They are around 20-60 bucks. 34" TV. I am assuming this one without looking it up it is NOT a flat screen, as most do not squeal like that nor do they have to de-gausse like the old ones. I just looked it up and yes it is not a flat screen. Old school, so that is more thank likely the problem.

Posted on Mar 02, 2009

gripfitter
  • 557 Answers

SOURCE: Can you supply pinout for Dell AA23300 Power Supply ?

On the main plug there is a single green wire. Jumper the green wire to any black groung wire in the plug and the fan will start and you will have output.

Posted on Dec 20, 2009

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The first click is the power relay connecting up the main transformer, the second click you normally hear is the speaker protection relay. When a fault condition is present in the amp, the protection circuit prevents the speakers connecting to the amp by NOT operating the relay. As the unit "settles" and works after the delay you noticed, what ever issue the amp is balancing itself it. It sounds like a leaky capacitor in transistor in the output stages. This can often be located with quick bursts of freeze coolant spray. It may also be a dry joint in the soldering about the driver and output transistors, always pays to have a visual look at it whilst you are in there. I also check power regulator stages for dry joints. The fault will be on one channel if it is signal path related, and both channels if power supply related. If you are familiar with electronic repairs, get in and have a look yourself. If not, get a NAD service guy to take a look at it for you. Good luck. Feel free to ask me any questions you may have about it.

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