Bad inverter or ccfl?

avadyn · Post by **avadyn** » Sun Aug 10, 2008 1:19 am

I bought a broken Westinghouse 17w7 monitor off of ebay.

When I turn it on, the monitor will light up for 2-3 seconds, then go dark. The screen can still be seem very dimly.

How do I tell if it is the inverter or the cold cathodes that are bad?

I have already taken the monitor apart and took out the cathodes. There seems to be black stuff near the edges of the bulbs, is this normal or are they bad?

thanks for your help!

avadyn · Post by **avadyn** » Sun Aug 10, 2008 10:41 am

Also, there are 4 ccfl's, 2 at the top and 2 at the bottom. Since they all go out, are they wired in series and if one goes bad do they all go out?

or does this mean it is the inverter?

Rekarp · Post by **Rekarp** » Sun Aug 10, 2008 10:56 am

Usually when you buy an inverter replacement kit they come with bulbs. Atleast when I replaced my Dad's backlight it did.

avadyn · Post by **avadyn** » Sun Aug 10, 2008 11:11 am

found this on the datasheet (FLC43XWC8V)

This LCD module has 4 lamps. Each 2 lamps are placed at upper and lower side of the
display.
2 lamps are connected in parallel.

hm

avadyn · Post by **avadyn** » Sun Aug 10, 2008 1:56 pm

I think its one or two of the bulbs that are bad. I hooked them back up to the inverter and turned them on. One set of two glows bright white while the other glows a pinkish tint before everything turns off.

phantom92opera · Post by **phantom92opera** » Tue Aug 12, 2008 8:04 am

i have the same problem on a laptop screen. the cathodes arent lighting properly because of improper voltages.. if they flicker then they still work... its your inverter.

avadyn · Post by **avadyn** » Wed Aug 20, 2008 10:19 am

turns out is wasn't the inverter! =D I replaced the backlights and it's working 100%