Here are some links to good information for those new to CCFL's, Inverters,
Circuits, etc for Display Backlighting.

Included are Application Notes and White Papers among the various links.

[url]http://www.educypedia.be/electronics/circuitsccfl.htm[/url]
[url]http://www.educypedia.be/electronics/LCDbacklight.htm[/url]


Ref:
[url]http://en.wikipedia.org/wiki/CCFL_inverter[/url]
[url]http://en.wikipedia.org/wiki/Cold_cathode[/url]
[url]http://www.educypedia.be/electronics/lcd.htm[/url]


Sources:...

While searching for information on CCFL's, and Inverters I have located about
eight Application Notes and White Papers that would be good useful information
for folks new to the forum. Might help the Seasoned Forum folks also!

Is it proper/OK to post these for others to view/use? I didn't see anything
in the Forum Posting Guide about it being acceptable or NOT!

Thanks.

lkraemer

Re: CCFL's, Inverter, & MAG LT716S700P

Good News! It is 21:45 and my MAG LT716S 700P is still working. I consider this
thing fixed. Here are the steps I used to fix the LCD Monitor.

1. Re-Solder both Transformers.
2. Re-Solder any joint that looked cold under a Magnify Glass.
3. Replace the following caps:
2 - 10MFD 50V C3, C25 5mmx8mm P10316-ND
2 - 100MFD 35V C10, C11 8mmx11.5mm P10294-ND
6 - 470MFD 25V 10mmx16mm P10275-ND
1 - 220MFD 25V 8mmx12mm P10271-ND
1 - 47MFD 50V 6mmx11mm P10321-ND
1 - 100MFD...

Re: CCFL's, Inverter, & MAG LT716S700P

My mailman brought me the Caps from Digikey today. I replaced them
one at a time, and double checked my work when done with my Magnifier
Glass. Of the caps I removed most checked good out of the circuit,
but a 47MFD and the two 100MFD's didn't show anything on my Fluke or my
Cap Checker. It was a little over 83 here today. (I replaced EVERY
Xunda Cap that was on the Power/Inverter board, and it was less than
$15.00 with Priority shipping)

I powered the unit up at 14:30. It is now...

Re: Invertor problems

Here is my suggestion on your problem!

If you look closely at the Photo I have included, you will see how the power
is generated for the CCFL's. Now, you have two of these circuits, UPPER &
LOWER supplying 4 CCFL's. Since you can swap CCFL's and you have the
same problem, it is associated with only one PLUG. Can't possibly be a
Transformer (unless you have a separate Transformer for each CCFL) because
one Transformer supplies two bulbs. It could be the small cap (CY2) is open
on the HV AC output side...

Re: CCFL's, Inverter, & MAG LT716S700P

The Caps are the typical Xunda for the Mirage Electronics 200-000-170DTL1
PowerSupply/Inverter as posted on the other MAG 17" and 19" postings.

I ordered the correct ones from Digikey as per the other postings.

Thanks.

lkraemer

I have just ordered Caps for my 17" MAG LT716S 700P, and I am waiting on their arrival.

My Mag seems to have more of a Thermal problem, as it runs fine for ~1 hour,
then goes to a BLACK Screen. A small fan placed at the lower back of the
unit keeps it running all day. I've removed the Power Supply, looked it over
with my Magnifying Glass for cold solder joints, looked at all the Caps
(all appear good). Then I resoldered all the connections for the Transformers
and anything else that looked suspect, or a cold joint. Time will tell...........