faint display

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  • george1967
    • Jul 2025
    #1

    [Misc] faint display

    OK GOT A KM-3O40 WHERE THE DISPLAY WILL NOT ADJUST ENOUGH TO BE SEEN IN REGULAR LIGHT . YOU CAN TURN IT WAY UP AND IT IS VERY LIGHT AND WHEN YOU TURN IT DOWN IT IS COMPLEATLY BLANK. HAVE CHANGED THE LCD DISPLAY (2JB45010 LCD OPERATION) AND THE (2JB94040 PARTS,PWB OPERATION TOP ASSY SP) WITH NO LUCK.

    ANY HELP WOULD BE GREATLY APPRECIATED.
    Tags: 4040, adjust, blank, display, faint, lcd, light, parts, shorting, top
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 23008
      #2
      Re: faint display

      There have been times that the room light was so blindingly bright that it was impossible to read any LCD display. I remember a particular dentist's office that had floor to ceiling glass on three walls. Not only could I not read the display, if there were too many consecutive sunny days the drum would suffer light shock from the sunlight shining in through the vents in the back of the copier. I couldn't convince them to move the machine, and MacGuyvered some vent covers like on the new Konica Minoltas. I'm assuming that you'd have thought of that.

      This suggests to me that the backlight is good in the new LCD display, but the inverter is probably failing.

      I can't remember if it's the right, left or center PWB that has the inverter. Just follow the wires (pink & black?) from the backlight to the PWB. The CS-2560 has it's own little inverter PWB solely for that purpose.
      =^..^=
      If you'd like a serious answer to your request:
      1) demonstrate that you've read the manual
      2) demonstrate that you made some attempt to fix it.
      3) if you're going to ask about jams include the jam code.
      4) if you're going to ask about an error code include the error code.
      5) You are the person onsite. Only you can make observations.

      blackcat: Master Of The Obvious =^..^=

        Comment

        • george1967
          #3
          Re: faint display

          thanks black cat looked it up in the parts list and ordereed the "right PWB" will update when done

            Comment

            • george1967
              #4
              Re: faint display

              found the problem last tech that was there tried to short cut the touch screen replacement and there were wires shorting out to the frame

                Comment

                • JR2ALTA
                  Service Manager

                  Site Contributor
                  1,000+ Posts
                  • Feb 2010
                  • 2033
                  #5
                  Re: faint display

                  Originally posted by george1967
                  found the problem last tech that was there tried to short cut the touch screen replacement and there were wires shorting out to the frame
                  Haha, I did that but it turned the display blood-red

                    Comment

                    • blackcat4866
                      Master Of The Obvious

                      Site Contributor
                      10,000+ Posts
                      • Jul 2007
                      • 23008
                      #6
                      Re: faint display

                      Originally posted by george1967
                      found the problem last tech that was there tried to short cut the touch screen replacement and there were wires shorting out to the frame
                      Good catch. Did you have to replace the PWB, or did just removing the short fix it? =^..^=
                      If you'd like a serious answer to your request:
                      1) demonstrate that you've read the manual
                      2) demonstrate that you made some attempt to fix it.
                      3) if you're going to ask about jams include the jam code.
                      4) if you're going to ask about an error code include the error code.
                      5) You are the person onsite. Only you can make observations.

                      blackcat: Master Of The Obvious =^..^=

                        Comment

                        • JR2ALTA
                          Service Manager

                          Site Contributor
                          1,000+ Posts
                          • Feb 2010
                          • 2033
                          #7
                          Re: faint display

                          Originally posted by blackcat4866
                          Good catch. Did you have to replace the PWB, or did just removing the short fix it? =^..^=
                          If it's what I did, you just have to route the ribbon cable properly, through the loop instead of pinned against the metal.

                            Comment

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