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Colour red missing

Advent hd 722i model 780 fst monitor has red missing from the display.

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Re: colour red missing

the problem with your monitor is the poor solder of the red drive transistor which is located at the crt socket of your monitor the white one with approximately 9 pins. try soldering all of the components in the crt socket board.

Posted on Dec 22, 2007

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If the problem is with laptop monitor, try restarting the computer. If problem remains, try connecting your laptop to external monitor to see if problem is with laptop monitor or with display adapter.

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hope u r a u r handling chip-level repairing of monitor, knowing itz hazardous n dangerous..

however, check thoroughly for dry soulderings..(esp. at the crt base)..[this chance is maximum]..
see if the base is loose or faulty..
yes, it can b the 'chroma ic'..but don't ignore the associated components..(esp around the base)..
check video amplifier n sub section..
the colour diodes, transistors n resistances at the base..

for better supervision contact ur system admin/vendor....

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as you are electronics engineer so let us discuss technically.

as you are unable to see green colour means you might be seeing picture of magenta colour

as technically

red+blue = magenta

crt has got three cathodes

your two cathodes circuit is fine one ckt that is green cathode circuit is not working.

for that problem your will have to check

  • cable from computer to monitor
  • loose contact in crt base.
  • crt connector loose
  • voltage on green video output.
  • green video output transistor might be defective.or print loose.
  • circuit related to green video ckt
  • green video signal coming to green video ckt.
  • & finally crt defective (in rare case.)
  • hope this will help
  • good luck.



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