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nahuckamisma
Member
Last Activity: 08-31-2013, 09:46 AM
Joined: 08-21-2013
Location: LEXINGTON, KY
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image



    If I have a blown fuse on the inverter board, and 2 MOSFETs that tested probably bad, is it worth replacing the capacitors to then have to replace the inverter board as well? Unfortunately I do not think I'll be able to do the surface mount soldering required for the MOSFET chips..

    Looks like a new inverter board is around $60 ...
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image



    So, that would mean at least 2 bad MOSFET chips? And these are surface mount chips...

    Would bad caps on power supply have caused the chips to die? I'm thinking it may be a lost cause (or at least more expensive than it's worth) to repair now ...
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image




    Looks like there are 2 sets of S/D/G pins, one NMOS and one PMOS and the PMOS is opposite of NMOS...


    Pin 1=S1
    Pin 2=G1
    Pin 8=D1
    Pin 7=D1

    Pin 3=S2
    Pin 4=G2
    Pin 6=D2
    Pin 5=D2

    Could you help interpreting these results?

    Between 1 (S1) and 8 (D1) I get:
    [COLOR="Red"]chip 1 = 0.5 ohms[/COLOR]
    chip 2 = 11 M ohms and slowly dropping
    chip 3 = 8.3 M
    chip 4 = 8 M
    chip 5 = 16...
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image



    Any way to test the MOSFETs out?...
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image

    Looks like:
    4512C
    AA6MN
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image



    Ok, an update.. Before I had just tested each fuse for continuity, and they were fine.

    Today I tested them for voltage, 2 of them have 20v on both sides, but then the one at the very top (picture 2) only had 20v on one side (the top side). I then checked for continuity and get 9.97M Ohms now... I swear it was fine in my earlier post...

    What would have caused this fuse to go? They are 3A fuses.
    Also, I am not sure where to test for the BL_ON you mentioned, the service manual doesn't have...
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image

    All 3 green/blue fuses on the inverter board check out good. The 3 larger green caps on the inverter board look good to me, some of the caps on the power supply are a bit more domed than these, they are pretty flat. It may just be the picture making them look that way to you
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  • nahuckamisma
    replied to Acer X241W - Green light, no image
    in Troubleshooting Computer Displays
    Re: Acer X241W - Green light, no image

    Attached are pics of all the boards, let me know if you see something you'd like a closer up pic of or a certain point I should test or something like that. I would much rather fix this one to keep my 2 matching monitors than buying a new one....
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  • nahuckamisma
    started a topic Acer X241W - Green light, no image
    in Troubleshooting Computer Displays

    Acer X241W - Green light, no image

    I have an Acer X241W that has stopped working. The computer detects it, the power light stays green, but no image on the screen. I tried shining a light to see if there is an image on the screen and no backlight, but I couldn't really see anything.

    I disassembled, and the power supply is putting out 12v and 5v on the connector that is marked. There is another connector going to the inverter that has 7 pins but not clearly marked which is which. The board mentions outputting 12v, 5v and 19v. I am assuming the 19v is going to the inverter.

    I inspected Caps for bulging/leaking,...
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  • nahuckamisma
    replied to New Members - please post your introductions here
    in Announcements & Related News
    Re: New Members - please post your introductions here

    Hello,
    I am a new member to the forum. I have an Acter X241W that has stopped working. The computer detects it, the power light stays green, but no image on the screen. I tried shining a light to see if there is an image on the screen and no backlight, but I couldn't really see anything.

    I disassembled, and the power supply is putting out 12v and 5v on the connector that is marked. There is another connector going to the inverter that has 7 pins but not clearly marked which is which. The board mentions outputting...
    See more | Go to post

    Leave a comment:

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