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Joined: 20-January 07
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t.james

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20 Jan 2007
Hello everyone,

I'm new tothis forum but, I've been watching it for some time.

I've got my sl-5500 recently and would like to play with it abit.
I'm looking for service manuals (I'now you have them guys) and specialy looking after any info about CCFL inverter.

It is writen in OESF FAQ about power consumption:
Backlight at Full about 340mA
And that's much!

I've found this page:
http://www.spritesmods.com/?art=ledbl&page=1

Guy changed backlight in HP Jornada and cut power consumption from 125mA to 90mA using white leds. In his PDA CCFL tube is much longer than in Z so he had tu use 14 LEDs.

I'd like to do something simillar for Z I think that beacuse of shorter CCFL in Z I'll need less LEDs and therefore (should) acheive even lower power consumption! Not mentioning that proper LEDs should give brighter light than (mine) CCLF.

As can be seen here: http://www.tekprosystems.com/zaurus/internals.htm (last photo)
Inverter is connected with MB using 6 track "ribbon", but it seems that tracks 1 and 2 (counting from left) conduct the same signal (take a look at track layout on PCB)

So my gues:
(1,2) , 6 - Power (Vcc,GND)
3,4,5 - control

Now I'd like to design LED control that'd be compatible with original inverter especialy dim control the only problem is I don't know how Z controls dimmming.
As far as I know there are two most common dim control options used in CCFL inverters:

- Analog (voltage) control
- Digital (PWM) control

I'm looking for any info about how Z control dimming and/or meaning of those 6 lines which are connecting MB and inverter.

So if someone has some knowledge about it please let me know.

Cheers,

James
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