19" General touch monitor

[pinball1]

I have a 19" General Touch monitor that does the 2 seconds then black thing.
The monitor only has 2 boards. An A/D-logic board and an inverter board.
I have replaced both boards with new ones and I still have 2 seconds then black.
Reading the sticky I'm not sure how to test the cfl's. The inverter board has 4 2 pin conectors. Do each of these power 1 lamp? Can all 4 of my lamps be bad?
Sorry if these are dumb questions, I have very little experience with LCD monitors.

[selldoor]

Re: 19" General touch monitor

Without a picture of the inverter board we can only guess.
Unlikely that all 4 are bad.
First test is to test one bulb at a time (that is remove the other 3 plugs) - it will probably only flash on then off. This test ONLY tells us if a bulb is broken or the wire snapped if there is no flash.

SWITCH THE MONITOR OFF WHEN PLUGGING IN/OUT

Having done that you need some sort of test lamp - either a spare bulb, old panel with some working bulbs or make a test bulb as Budms post in that sticky from a cfl

[pinball1]

Re: 19" General touch monitor

Removing 3 of the inverter connections and leaving one attached I don't seem to get any flash. Tried all 4, one at a time.
It I leave two on either end connected. I get the 2 seconds and black.
I guess part of my confusion is that after replacing both the a/d board and the inverter board and still having the 2 seconds then blank. I didn't think a cfl problem would do this.

[selldoor]

Re: 19" General touch monitor

Really need a picture - how many inverter transformers are there.

front and back (in the same orientation) (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed

https://www.badcaps.net/forum/attach...7&d=1280167246

https://www.badcaps.net/forum/attach...6&d=1280167246

https://www.badcaps.net/forum/attach...4&d=1280167246

[pinball1]

Re: 19" General touch monitor

Here you go

[pinball1]

Re: 19" General touch monitor

Am I understanding that a single bad ccfl can cause the inverter board to shut down hence the 2 seconds then black.

[RethoricalCheese]

Re: 19" General touch monitor

Yes!

[budm]

Re: 19" General touch monitor

If yiou try eack lamp connector one at time, each one should flash and goes off after 2-second due to protection circuits kick in, if one of the lamp does flash at all, then you can expect it to be bad wire or bad lamp.
Here are the example of bad lamps:
http://s807.beta.photobucket.com/use...96399110016205

[pinball1]

Re: 19" General touch monitor

So can you explain to me why I get no flash when I plug individual bulbs into the inverter board. I do get 2 seconds when I plug 2 bulbs in.

[budm]

Re: 19" General touch monitor

It can be that the screen has high contrast LCD panel, so when you look at the front of the panel you cannot tell if the one lamp actually flash on or not, you may have to do it in darken room, you can also make test lamps using old CFL or use you can use lamps from broken screen to verify the inverter board function.

[pinball1]

Re: 19" General touch monitor

I do know that the inverter and the a/d board are good (I think) because they are brand new exact replacements.

[budm]

Re: 19" General touch monitor

At this point you will have to use test lamps to verify for sure, or you will have to remove the lamp assemblies to inspect the lamps.