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  1. #1
    Join Date
    May 2012
    Location
    California
    Posts
    264

    York YK blank screen

    Got a call on a YK, customer stated it had a blank screen. Upon arrival opened control cabniet the two digit display on the microboard was flashing
    P2 , 05 , 04 in that order, looked in optiview service book and it looks like it was doing a self test and failed at a certian point. Reset power to the unit and still no screen, had to unplug the power supply plug at the top right hand corner of board and what do you know it board passed all self tests and display came back on any ideas? Thanks in advance

  2. #2
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,524
    depending on the type/brand of screen that you have, you need to set the pin jumpers properly. perhaps there is a little rust/dust that has accumulated on the jumpers...move them around a little to clear the crap off.
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  3. #3
    Join Date
    May 2012
    Location
    California
    Posts
    264
    I am 99% sure its a problem with the micro since it was'nt turning oil heater on.

  4. #4
    Join Date
    Jun 2012
    Location
    so cal
    Posts
    22
    i had the same problem it was a micro fuse on the board was loose. they look like little capacitors but if you look closly the are fuses. the watch dog program is rebooting the program.

  5. #5
    Join Date
    Mar 2004
    Location
    Windsor ON Canada
    Posts
    407
    Could be a bad coil on the oil heater contactor dragging down the power and not letting the display fire up. By unplugging the I/O board you removed the power drain and up came the display. Something to check.

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