Question about Dell E172FP 17" LCD Flat Panel Monitor

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Dell monitor not working , green light blinks.

I have this thing completely dissembled and i need to know what the caps look like and where are they located on the board also is there a way to check there values .

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  • toonsie Mar 28, 2008

    All the caps look fine. I was told that the things I should be checking are the 4 transistors.If they go bad the screen will not come on but the power light will continue to still blink green.Is it possible? I really need to prove to my wife that I can fix things!

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Capacitors look like cylinders mounted vertically on the pcb.

If you look at the printing on the board, there should be a label close to the capacitors such as C201, or XC330.

Usually a C in the label will indicate a capacitor.

They will be wrapped in a plastic jacket. The jacket will have writing on it, and usually a stripe down one side. The stripe indicates the negative lead (each cap will have two leads, negative and positive).
If the cap has a rounded top (domed) instead of a flat top, it is likely bad. You may even see that the component has split at the top, into four pie shaped wedges. This is also an indication of a bad cap. Lastly, the jacket is "heat shrunk" onto the metal cylinder. This usually causes the plastic jacket to overlap the top of the cylinder, which will show up as a donut shaped ring around the top of the cylinder. Some times if the cap is leaking, it will heat up causing the ring to shrink further so that the top of the cap will be completely exposed metal, with no plastic ring framing it. This also indicates a bad cap.

You can get the value from reading the print on the side of the cylinder. The values should be printed down the side of the cap, such as: 1000uF 16V, or 470uF 25V.

This is read as one thousand micro Farads at sixteen Volts, or four hundred seventy micro Farads at twenty five Volts (the u will actually be the Greek letter mu).

You will need a solder ****** to remove the solder from the caps on the solder side of the pcb (under $20), a soldering iron and some solder.

**** the solder after heating it with the iron, use the tip of the iron to carefully unbend the legs of the capacitors if needed.

Install the new caps making sure to observe the polarity. There will either be a mark in the board indicating where the negative lead should go, or a small + showing where the positive lead should go. Solder the leads and cut off the excess.

Make sure you get caps that are not larger physically than the originals or you may not be able to fit them into the same spot. (older capacitors are bigger than the same value newer capacitors).

Hopefully, you will only have three to six caps.

The lucky people will find only one bad cap, unlucky people will find up to ten bad caps, some in the power circuit, some in the inverter circuit, and some on the main board.

Caps on the main board can be very tough to remove. I recommend adding some solder to the legs of the caps you are going to remove, then heat one leg as you push the cap to the side to try and pull that leg out of the solder hole. Then heat the other leg and try to pull the cap completely off the pcb. Once done, you can use the solder ****** to clean the old solder out of the holes. This may be necessary because the main board is multilayer and these layers can act as a heat sink, making the solder harder to melt and harder for your solder ****** to remove. It's slightly easier once the capacitor legs have been removed.

Also note. Some manufacturers will use slightly larger caps, and in order to mount them they will bend the legs and glue the cap to the board on its side.

Posted on Mar 28, 2008

  • Mergatroid Jan 22, 2009

    You can check the transistors for shorts using an ohm meter. If you
    find one that is shorted, and if it is surface-mount it will be hard to
    replace without damaging the solder pads on the board.

    I use solder braid and a flux pen. Get all the solder off of the legs
    and the tab at the rear of the transistor. Then heat up the three legs
    using the brain to heat all three legs at once. Use a pair of needle
    nose pliers to carefully wiggle the transistor as you heat up the legs.
    If you're good and careful it will come off without damaging the solder
    pads.

    It's pretty hard to find surfact-mount parts. You'll have to look into local electronics shops and part suppliers.



    If the transistors are not surface-mount, you can use a soldering iron
    and a solder remover (they're called solder suckers but this site will
    blank out the work ******). You should be able to get these transistors
    from a local parts supplier. Or, they should be able to provide you
    with an NTE or ECG substitute.



    Look for the transistors on the power board/inverter or if they are
    seperate just on the inverter board. They should be mounted close to
    the high voltage output transformers which should be the last component
    before the light connectors.



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