Question about Dell 1503FP 15" LCD Monitor

1 Answer

Dell 1503FP Mark, I'm assuming the power board is the large board in the centre of the back (where the signal and power connectors are??)

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  • 7 more comments 
  • Matt Parish Apr 08, 2008

    Do you have an email address i can send it to? Description on the board: REV. No. MP 1.2 (2001.04.13) CODE BN41-00065A MODEL: 1503FP. Matt

  • Matt Parish Apr 08, 2008

    Hi Mark, I've just realised we have a add picture function! I'll send a picture tomorrow. Thanks, Matt.

  • Matt Parish Apr 09, 2008

    Hi Mark, The picture i took last night is too large to add. I will do it again in less quality tonight and re-post. Thanks. matt

  • Matt Parish Apr 09, 2008

    Hi Mark, Here is the picture. Sorry about the delay but i was struggling to get it below 150kb! Hope it helps. Matt

  • Matt Parish Apr 10, 2008

    Hi Mark, I already tried changing the PS but that didn't help. Also removing the inverter board didn't change anything. I used my multimeter on diode setting and i get 655 and 0 the other way round. Matt

  • Matt Parish Apr 10, 2008

    Mark,

    I've worked something out! if i unplug the power plug, leave it 30 seconds, then disconnect the screen data plug from the main board (CN401) then plug the power lead back in, and then re-connect CN401 it works! If i then push the power button (to turn it off) it won't turn back on again. I have to start again. Any ideas why or how to fix??

  • Matt Parish Apr 11, 2008

    Hi Mark, I've read the IC's and here are the results:

    (IC with legs below 1 - 5)

    IC101 Screen un-plugged

    1. 11.82

    2. 4.85

    3. 0

    4. 4.9

    5. 0



    IC101 Screen plugged in

    1. 11.95

    2. 4.85

    3. 0

    4. 4.98

    5. 0



    IC102 screen unplugged

    1. 11.80

    2. 3.13

    3. 0

    4. 3.3

    5. 0



    IC102 screen pluggen in

    1. 11.87

    2. 3.19

    3. 0

    4. 3.3

    5. 0



    I think my trick yesterday was a coincidence. When i plugged it back in today with the screen unplugged, it wouldn't turn on again.

    Hope to hear from you soon.



    Matt

  • Matt Parish Apr 11, 2008

    Hi Mark,

    I have 12v accross FT127, 101, 100, 121, 102

    3v accross 305, 301, 305, 308

    5v accross 120, 501

    0v accross 126, 127, 252, 105, 115, 107, 304, 302, 203, 125, 408, 407, 406, 404.

    when the screen fires up i get 3v accross 203, 125, 408 and 404 (0v when the screen doesn't come on.)

  • Matt Parish Apr 24, 2008

    Hi Mark, Hope you are ok? I was just wondering how you were doing with the board? Matt

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  • 472 Answers

Yes, The largest of the 2 boards in there. (left side of the monitor if you were looking at it from the fornt.)

If you can get a photo of it, it is possible it could be a different variation in your monitor. They tend to slap them together with whatever parts they have.

Posted on Apr 08, 2008

  • 3 more comments 
  • Peter Thompson
    Peter Thompson Apr 08, 2008

    Excellent, I will dig out the schematics today if my wife knows where I put them =)

  • Peter Thompson
    Peter Thompson Apr 10, 2008

    Ah ha, you have the older version of the PCB. I have one of those in front of me right now.

    Try another powersupply if you have one spare. It needs to be around 12volts 2amp, or as close as you can get to that.



    The second thing to do is to disconnect the inverter board from the main board and see if you lights return to normal. You will need to use a torch to see if any signal is showing on the screen of course.

    If that gets things running, then we can look at the inverter board.



    The third thing is right next to the power plug there is a large diode there. Use a multimeter and put the probes onto each end and read the result. Then swap the probes around to the opposite ends and do the same thing. The end result of this should be a high number at one reading and then a number around half that for the opposite end.



    These boards have a high death rate. But by the same token have survived way beyond their expected life term. If it has gone terminal, then in this case it's a put it on the shelf and maybe oneday another will come in you can mix and match them for spares.

  • Peter Thompson
    Peter Thompson Apr 11, 2008

    I can't point to a single thing that would cause it but it is power related.

    The reason it's allowing you to turn it on with out the LCD being connected to the board is there is power getting to it to do that. But add the LCD back into the equation and there isn't enough power to boot it all at the same time.



    That make any sense to you?



    Ok, start with this..

    There are 2 large IC's with 5 legs on them (IC101 and IC102)

    If you have a multimeter then put the black lead to anything ground, apply power to the board and check each of the legs on thse IC's (without the LCD panel being attached).

    Write down the results.

    Next, remove the power, connect the LCD and apply power again .

    Check the voltages of those same IC's again and note what they were without the LCD as opposed to now.



    Careful not to touch 2 pins together with the probe.




  • Peter Thompson
    Peter Thompson Apr 11, 2008

    Ok, phase 300 =)

    You will notice all over the place are fuses maked as FTxx, check eash of those with the power on and see if any of those are registering nothing at all with the panel plugged in.

    Just pop the black lead into the metal bracket to use as a ground and you can just romp around then with the positive probe to make life easier.

    It is still possible that although the board is getting the correct voltage, it's not letting out enough milliamps to run everything.

  • Peter Thompson
    Peter Thompson Apr 12, 2008

    Well that is a start. There is something not letting the power accross but only sometimes. I will have a look at this board I have again today and see what voltages should be at the surrounding IC's.

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