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I havve a 403T Samsung monitor which when the unit is powered with back power rocker switch a amber light appears and then goes out almost immediately . If I cycle the power rocker switch 2 -3 times quickly the amber indicator will stay on but can not get any functions to work, like the front panel on / off button .I think this amber light is supposed to be green if the set is ok . I have visually inspected the pc boards and can not see any damaged or abnormal looking caps / componets and no sign of burnt traces on pc boards. can you advise me of which pc board is most likly the problem?

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  • wheelsss May 14, 2010

    thankx I was hoping for a lazy fix. Larry

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Http://www.nodevice.com/manual/newmans/403T_CK40pdf/get20938.html
http://www.givemefile.net/smanuals/monitors/samsung/file/36982.html
OK above please find a user manual and below that a service and repair manual, this is what the engineers use to troubleshoot and hopefully repair.
Troubleshooting say if it is shutting down, after a certain amount of time, of working and then faulting, then it is most definitely a "Thermal" problem, the way we "Find" problems such as this is "Freeze Spray" you use this on each component that is suspected of being the "Culprit" and you will soon,find that errant component. Now also not every fault is a Capacitor, I see many, many people that think, that Capacitors are always the "Culprit" now while that may be true in a few cases, a faulty Electrolytic Cap, or ordinary, Cap goes faulty, this is only a SYMPTOM, something has damaged those caps causing them to "Fail". One MUST always find the root "Cause", otherwise if you just treat, the SYMPTOM, the "Cause" will just make the "Symptom" come back, in short order, as the prime cause still, hasn't been fixed., Now Capacitors hate AC ripple, or Over Voltage. Thats it. Oh.. and Heat, if these Capacitors, are too close to a Heat Source, then thats a prime cause of failure. Resistors, hardly ever go faulty,and if they do, it is generally obvious. However it doesn't hurt to check values with our Multimeter. Remember though resistors are made, with up to 20% tolerance from stated value, as such, are not too critical, unless in Timing circuits etc. Always check, the Values, of resistors, as with any other component, with the power OFF. Now Diodes especially "Zener Diode", are another thing to check, those and ordinary "Signal Diode" should always be suspect. next we have Transistors and IC's. The Transistors MUST ALL be checked to see if they have a good, "Junction" this is done, with our meter set to "Diode Test" and usually are about 0.6 to 0.7. With IC's you must check, voltage levels, or Logic Levels, going in and out, have a look at the circuit diagram, and it will tell you what they should be. It is a good idea to always measure the Power Supply voltages, see if a "Rail" is Low, that will be because some component has gone somewhat or all short circuit, to Earth, now, if the "Rail" is Higher, suspect an "Open Circuit" component, like a Diode, or Transistor. The voltages expressed in the manual are spot on, ANY variation MUST be investigated. I have been doing all this for over 30 years now, and I do indeed wish, we could have a set of "Symptoms" and be ables to say.. "Oh that;s the so-in-so and replace this" however unfortunately this although does happen, most "Symptoms" can have literally tens, of "Causes" all often "Interlinked" One simply has to do a methodical troubleshooting procedure, and always think, "are my Voltages Correct" as this is how, you Fix the problem, by making them so. Keep up the good work. If that link above doesn't furnish a Service manual, it is imperative you get one, even if you must pay for it. It will pay for itself in about 2 mins. Now just replacing boards will most likely just end up with more faulty, boards, as related you MUST ensure that you have the cause of the event, before we change anything. I have seen so called, "Techs" replace every board, and virtually every component, and that STILL didn't fix it, because the "Fault, or Cause" lay elsewhere, and had not be repaired FIRST, you see that FIRST STEP, like everything in life, is, CRITICAL.

Posted on May 14, 2010

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Hello,

the amber light is supposed to turn green when the monitor receives signal from the CPU. We need to know where the fault is coming from, if its from the Monitor or the CPU.

First, connect another confirmed working CPU to your monitor and if there is a display on the monitor, then it will be certain that the fault is not from your monitor and if there is no display, then the fault should be from the monitor.

If the fault is not from the monitor, then you need to troubleshoot your computer/CPU.

Check the VGA cord that connects the CPU to your monitor, Check the VGA card on the CPU's motherboard, if it is well fixed.

Check your motherboard RAM (memory). If the RAM is not well fixed or dusty, there will be no display. Remove the RAM from the motherboard, clean the RAM and RAM slot.

Also, check your motherboard processor, remove it clean it and return it back, just as you did for the RAM, because the processor also can make the CPU not to display on the Monitor.

If after doing the above and the problem is not still solved, then your motherboard is the one that is causing the problem, you will have to get another motherboard, as it is rare to repair motherboards.

I wish you good luck.

Posted on May 13, 2010

  • wheelsss May 13, 2010

    Are you familiar with this particular unit?? It is more like a tv than a computer monitor . Without the unit powering up to a green light on the front panel you can not select one of the several inputs . ia rca ,s-video dvi etc . please respond back ;

  • Walesarumi
    Walesarumi May 13, 2010

    Hello,

    I'm sorry, I didn't know it wasn't exactly a monitor, I mistook it for normal computer monitor.

    The best I can provide for you now, is the service manual of your monitor. I believe the service manual should be able to guide you on what step to take in resolving the problem. Note that the service manual is different from the user manual. The service manual is for troubleshooting and repairs.

    Visit:http://www.givemefile.net/smanuals/monit...

    Scroll down the page a little bit and you will see "Download Samsung service manual 403T repair manual".
    Enter the code above it before you click the download.

    If this does not please you, you can simply ask the next available expert.

    Good luck.


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