Good the site is back and running :)
Now my LCD backlight isn't working after salvaging my x50v from water damage (thx aximsite),
I've tested every single functionality and everything is working perfectly,
Any ideas about the back light ..? certain connector on the board I need to double checked ..? can LCD backlight be replaced ..? I did firmware update (A02) and WM5 install, but no difference.
Hoggie : Well do you mean brightness settings ..? yup, and it makes no difference.
star: You are so right .. its quite possible it wasnt something that was built up afterward it was almost instant after the water damage thats why I would for something burnt or something,
do you have any idea how to reach the bulb / inverter .. how to replace/check them and with what ..?
I've been all over the internet for hours and hours and there is nothing I could found of help, Dont even whether these parts are in the on the LCD assembly or the main board.
I was checking the LCD ribbon, and last golden connector (counting from the digitizer side) seems to be disconnected from the ribbon wire (the non gloden part the goes from the LCD itself) I dont know but it doesnt seem busted, might be a ground connector or something.
Star : any futher ideas about the inverter/bulb ..?
Not too sure about the X50v, but the X30 has a separate connector for the backlight inverter. The inverter itself is integrated into the LCD module. The inverter seems to use a piezoelectric transformer instead of the more usual magnetic transformer ("flyback transformer"), but I cannot completely verify. Backlight inverter transformers typically are potted in epoxy as they operate at high voltages.
Just beware that the lamp operates at high voltages (about 500v or more to start, probably about 200v operating).
BTW, for those who have noticed that the screen flashes brighter than usual for a brief moment when turning it on, that's caused by the high starting voltage ionizing the gas in the bulb. Once the gas ionizes, the voltage (actually the current) is automatically decreased to the required level.
Quote:
I was checking the LCD ribbon, and last golden connector (counting from the digitizer side) seems to be disconnected from the ribbon wire (the non gloden part the goes from the LCD itself) I dont know but it doesnt seem busted, might be a ground connector or something.
That very well could be the problem. Try fixing it and see if it works.
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Originally Posted by A friend of mine who has a Linux kernel named after his girlfriend.
If I was VirtualBox, I could load my virtualization module into Hannah and boot up another kernel in the same address space.
I think the Axim x50v has LEDs as backlight.
If you have a damaged diffusor foil you can see that there are multiple little light sources on the bottom of the screen.
So there is no inverter
Luxeon LEDs (used for backlighting) still require a special power supply circuit. Both Luxeons and CCFLs (fluorescent bulbs) are driven by current. However, a CCFL operates at about 200v at 2mA AC, while a Luxeon operates at about 3.5v at 300mA DC (about 3.7v, 3.3v, and 1.7v at about 100mA each for adjustable color versions).
Luxeon LEDs are still relatively new technology for LCD backlighting. They are actually slightly worse than CCFLs in terms of efficiency, but offer better quality light. They can also dynamically adjust for increased contrast ratio, something that is very difficult to do with CCFLs. Not sure about cost but I think they're more expensive as they're still new and not used as much as CCFLs.
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Originally Posted by A friend of mine who has a Linux kernel named after his girlfriend.
If I was VirtualBox, I could load my virtualization module into Hannah and boot up another kernel in the same address space.
WOOOOW ..
Should have certainly majored in EE instead of CS at least this would have made much more sense to my ignorant CS oriented brain right now.
Any way, from what I understood from your posts if its bulb, led, inverter (although I dont have a seperate connector) or even LCD ribbon they are built into the screen and thus screen should be replaced (or is it feasable to fix .?!)
I think the major thing now is to try to localize the problem .. board or LCD .. which I have no idea how to do without actually buying a new screen and trying it.
there is a big possibility something burnt there as when I opened the axim there was brownish black color on the at the bottom of the LCD metal casing.
Carefully open the LCD assembly (the bulb is very fragile). If the bulb looks like a thin white glass rod, it's a CCFL. If it looks like a small piece of transparent plastic with metal inside it, it's a Luxeon.
BTW, I actually measured the voltage of a 2.5" CCFL bulb from an old thermostat. The voltage was actually around 250v operating. But measure it before the resonating capacitor and it's 700v! It's surprising how much voltage there is in an otherwise low voltage device. (Well, maybe not very surprising as there must be enough voltage to jump through and ionize nearly 2.5" of argon gas and mercury vapor! Some CCFLs also have an extremely tiny amount of radioactive material to ease starting.)
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Originally Posted by A friend of mine who has a Linux kernel named after his girlfriend.
If I was VirtualBox, I could load my virtualization module into Hannah and boot up another kernel in the same address space.
Meanwhile, here are the pics, give me your openions on what might be of more reasons :
LCD ribbon (check the first line from the right, dont know does this look like a broken like to you or does it seems that this was how it has always been..?) if any one has taken photos when he took apart his axim please inform me.
LCD board pins ( well I have cleaned almost all the corrosion on the first pin from the right) sacastically that what the disconnected ribbon line should connect to (matching the line/pin count) didnt have the camera around to take pics of the cleaned pin but now it looks more silvery and less black.
Wichtel,
you mean the ribbon isn't damaged ..? so the disconnected line is normal i guess.
you are suggesting a damage in the motherboard pins then .. ?
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LCD Backlight
