Question about Avaya Merlin Magix 4424D+ Telephone

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MERLIN MAGIX R.4 WITH 412TDL NO DISPLAYS WORKING WITH 4424LD 4412D OR 4406 HAS TALK BATTERY AND MESSAGE WAITING LIGHT BLINKING. SWITCHED CORDS, CARRIER, PROCESSORS. ALSO TRIED 024TDL AND SAME THING. WHAT NOW?

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  • eflattsixfou May 23, 2011

    i have a merlin magix r.4 with a 412 tdl card and none of the 4400 series diplays work.i tried an 024 card, same problem. switched carriers, power supplies, jacks, anphenol cable. please help.

  • eflattsixfou May 23, 2011

    h this happens with multiple phones and some are new in box ?

  • eflattsixfou May 23, 2011

    are you an expert with merlin magix ? if yes please respond.

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  • Master
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Hi, well usually when this happens on ones i get into the shop, these are usually faulty in the area of the control CPU, and or the driver for the display.

Often it is bad soldering on the crystal or the PLL IC. In any event, this is NOT a problem that can be sorted by DIY.

To repair this phone it would have to be returned to the manufacturer, for a "Quote" as to the cost of the repair.

In all honesty though, most often repair isn't an option and the cheapest way usually is to obtain a new unit.

Posted on May 23, 2011

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  • Master
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Displays are usually simple connections. The problem with your display is one of 2 things either the backlight is bad therefore when you put it on the display remains normal and therefore looks like nothing shows. These lights are usually tiny LED bulbs and are difficult to spoil so first trace the source of power to them before replacing them.
The other likely problem is the display board itself being bad or the connection to it being bad. Try replacing the display board and also check the flex cable to the board for continuity. Once you check this the problem should be somewhere along those lines.
Hope this solution has been helpful?

Posted on May 23, 2011

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  • Master
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Since you've changed the processor, that leaves things like support chips, bad solder joints, and other nightmare scenarios. The blinking leds usually indicate a power problem, or non-functioning
section of the circuit, and the microprocessor incates this in that manner. Unfortunately, noone troubleshoots to the level that would really help you, since these things are designed to function and then be thrown away, and there's just no demand for any precise troubleshooting or repair expertise in this arena. You would need at least an oscilloscope, schematic, and engineering description of the circuit to be able to have a shot at pinpointing the problem.
Telephone lines are subject to spikes, as well as power lines, and herein lies most failures, since the spike can zap any number of chips, and even simultaneously, which is not cost effective to even try to repair.
My best shot would be to tell you to measure source voltages, and ensure they're on the power input pin of every chip. If you have a scope, you can verify the functioning of the cpu, more or less.
A schematic would be helpful to trouble-guess components that may have been damaged by a surge, but even this is difficult, unless you're familiar with the circuit.
Diodes are the old school way of protecting against surges, and can be suspect, still. There are what they call fusible links in many modern circuits, and they are very low ohm resistors that open with excessive surges. They are usually and ohm or less, and marked (color-coded) as resistors.
Brush up on your color code, measure any suspect small, resistor looking component, and replace any that are open.
Actually, that's the best shot, now that I think about it. If you have access to a scope, you will see the voltage die across the component, and can just poke around, versus ohming out.
Wish I had Merlin's ball for this one, and too bad the company doesn't have it for support!
Good luck, and hope this helps. You're going above and beyond where few have ventured.

Posted on May 23, 2011

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