lcd monitor problem

[lurk]

My 15 inch HP lcd monitor has a red tint to the screen...any
adjustments or trouble shooting hints please......thanks

 

[Michael Kennedy]

Possibly a bad VGA cable of bad ccfl lamps.

I'd bet on VGA cable.

- Mike

 

[lurk]

Thank you Mike....that gives me a start....I don't know how they generate
the color on these.....I'd like to get a how to repair book on
these....not to many guys know anything about them.....thanks again

 

[Michael Kennedy]

Well there isn't much to most LCD monitors from my experience.. I've just
started reparing them recently and most problems are related to bad
capacitors or bad lamps.

The reason you don't find much info on them is there isn't nearly the amount
of components inside one compared to a CRT monitor. Usually all they have in
them is an inverter board wich powers the flurescent lamps in the lcd panel
and a control board which handles video signal processing..

- Mike

 

[lurk]

Is there any books out on the repair in general?? and the lamps I
can google and see what they look like .....thanks again

 

[DaveC]

Thus spake lurk:

My 15 inch HP lcd monitor has a red tint to the screen...any
adjustments or trouble shooting hints please......thanks

Your CCFL lamp has reached "end-of-life". They go pink when they are old.

jkl lamps.com has lamps and some links to articles showing how to do this.
It's pretty straightforward, but not for the faint-of-heart.

http://jkllamps.com/index.cfm?action=fam&tid=2&fID=45

Good luck,

 

[Michael Kennedy]

Here are some links to help you out..

This appears to be a quite long article, but has no pictures which makes it
not so good.
http://iantha.vectorstar.net/ccfl.html


The stright bulb on this page looks like your typical ccfl lamp.
http://www.ccfl-inverter.com/html_en/ccfl_for_lcd_backlighting.htm


You can buy ccfl lamps at www.mouser.com or
http://www.lcdpart.com/ (they have instructions on how to do it with
pictures)

Yet another article..
http://inventgeek.com/Projects/BacklightFix/overview.aspx


Just google LCD backlight or CCFL backlight.

You can somtimes find free service manuals for whatever monitor your working
on at http://www.eserviceinfo.com/


One word of caution if your changing ccfl lamps.. They BREAK VERY EASY if
your not careful.

- Mike

 

[Dave]

Here are some links to help you out..

This appears to be a quite long article, but has no pictures which makes
it not so good.
http://iantha.vectorstar.net/ccfl.html


The stright bulb on this page looks like your typical ccfl lamp.
http://www.ccfl-inverter.com/html_en/ccfl_for_lcd_backlighting.htm


You can buy ccfl lamps at www.mouser.com or
http://www.lcdpart.com/ (they have instructions on how to do it with
pictures)

Yet another article..
http://inventgeek.com/Projects/BacklightFix/overview.aspx


Just google LCD backlight or CCFL backlight.

You can somtimes find free service manuals for whatever monitor your
working on at http://www.eserviceinfo.com/


One word of caution if your changing ccfl lamps.. They BREAK VERY EASY if
your not careful.

- Mike

Mike, speaking of parts, have you found a source for inverter transformers
capable of supporting 2 19" lamps? I'm guessing the transformers will have
to be rated at about 14 to 16 watts to handle the bigger lamps. Digikey has
inverter transformers but they seem to stock only the smaller ones which are
good for screens up to 15".
Thanks, Dave