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LA-J091P No display output on LCD, has display on HDMI-out

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    #1

    LA-J091P No display output on LCD, has display on HDMI-out

    Hi everyone, I have a Dell Inspiron 5593 motherboard with i7-1065g7 and mx230. I recently had an issue with my motherboard flashing 2 amber 7 white (LCD Failure). The LCD is working fine since it works when installed on another laptop. EDP/LVDS cable has been replaced and I am confident it is working since when I try to run the BIST, it opens up the backlight only but no display (A different LCD would only show white screen). The laptop is working fine though. It just has no display on the built in LCD but it has display output through HDMI cable, which points me to a board level problem. Tried checking for continuity on all the pins of the eDP motherboard fpc but nothing seems shorted.

    I have gotten a schematics file from this forum but I need a boardview of my motherboard since the LAH872PR10-0606.brd file that I also obtained from this forum is a different one, and I can't locate the components properly. Please help me, repair shops here simply ignore my laptop and shrug it off as LCD failure.

    Thank you in advance.
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    #2
    Re: LA-J091P No display output on LCD, has display on HDMI-out

    See if you got needed voltage on the lcd connector

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      #3
      Re: LA-J091P No display output on LCD, has display on HDMI-out

      Originally posted by Stevedb View Post
      See if you got needed voltage on the lcd connector
      Which specific pins should I check? I have the schematics but I can't find a boardview anywhere for this specific motherboard. One specific pin captures my attention though. LCD_CBL_DET. The onboard diagnostics somehow doesnt recognize the LCD cable, but my microphone and webcam works fine. Also, since the display backlight is on during Built in LCD self test but has no display and just a blank screen, possibly an LCD signal problem?

      I'm about to replace this motherboard anyway since it has a faulty DIMM slot and I believe a problem with fan control since it's on max speed all the time (even with low thermals), but I am still planning to try and repair it's problem if I can trace and fix it.

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        #4
        Re: LA-J091P No display output on LCD, has display on HDMI-out

        Hi is it original screen from the laptop. Did it work before do you have main power rail on the screen connector , 3,3v lcd on and dim on single. I do not know how the signals are called in this board. But i would see if you got those required signal. Maybe you can sent shematic here then can somebody help you.

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          #5
          Re: LA-J091P No display output on LCD, has display on HDMI-out

          Originally posted by Stevedb View Post
          Hi is it original screen from the laptop. Did it work before do you have main power rail on the screen connector , 3,3v lcd on and dim on single. I do not know how the signals are called in this board. But i would see if you got those required signal. Maybe you can sent shematic here then can somebody help you.
          Well, my LCD is no longer the original since the original was damaged. But this screen has been working fine with me for over 2 years now, and yes this has been tested and was working on another laptop with 30-pin eDP. I have the schematics here but I couldn't find a boardview for my board. (not even in vinafix). I think main power is good since it lights up on the LCD self test, but no display output, again, just backlight on. I'll check voltage on the other pins for the edp connector and see what's in there. I was just unsure of what voltages/resistance values should I be expecting.
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