NEC LCD4000 weird backlight issue

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  • reliantkcar
    Member
    • Aug 2013
    • 34
    • usa
    #1

    NEC LCD4000 weird backlight issue

    ok so got a real cheap NEC LCD4000 monitor
    it's a 2003 model and the first large LCD ever made supposedly

    it has 5 inverter boards

    when i looked at it it had the bottom 3rd was dim

    so brought it home and did some inverter swapping

    since the bottom 2 werent working
    first I swapped the 3rd one wit the6th and it didn't cjange so number 6 works

    then i swapped 4 with 5 and now 4 bulbs are on
    then the bottom one came on for 20 mins then died

    they all feed each other so when i put the bad bottom one in the middle it wouldn't power the ones below it so it's definetly bad

    am i correct in assuming the bottom inverter is bad when its cold it works and after 20 mins the bottom one shuts down

    also the bottom 2 bulbs are brighter than the other 3 so the bottom must have been off for a while
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: NEC LCD4000 weird backlight issue

      Can you show us some pictures of the chassis?
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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