If you go into the bios on the faulty motherboard / laptop is there any options with regards to the screen or screen brightness in the bios itself. I know no the Dells you can adjust and set the screen brightness depending whether it is on mains or only battery and I normally tend to set both to the max setting, save, restart and check again ?
Also reset bios to factory defaults or optimal settings ( whatever the option is called ) and save and restart to see if that helps at all. Also the mains cable you are using , if you try a different one to see if that makes any difference ?
I've seen it in the past where we had a few models of Lenovos and picked the wrong power supply and the watt rating of said power supply wasn't enough for the laptop we connected it to, when it was connected the screen would go very dim like that and when we disconnected it ie running on the battery the screen would go back to normal. Then swapped the power supply to the correct one and it worked fine and the screen didn't go dim
Not sure if it will apply to your make / model of laptop but sometimes on the Lenovos if there is no power in the battery and it has not been charged or connected to mains for a day or more then you can't power the laptop on correctly ie you see the LED's for num lock, caps lock, accessing the hard drive but there is no display. Probably won't help but Just curious
If you disconnect all power sources ie battery and mains lead and then if the laptop is easy enough to get apart and put back together ( assuming it does not invalidate your warranty ) you could disconnect the cmos battery for 30 seconds or so, reconnect the cmos battery, put it back together and re connect battery and mains lead and power back on ??
Last edited by mac_shinobi; 4th October 2012 at 12:34 PM.
Have you tried the screen ? If it's not the inverter or cable is it possible the CCFL has been broken in the screen.
I would say motherboard fault then - the ram was only for patchy colours or issues with it not displaying correctly, not with regards to the brightness. If there is not enough power provided before it gets to the inverter or the inverter is not stepping the power up enough or not working correctly then you get brightness issues, but you have already tried swapping that, the screen etc etc and it is still the same so presume it is a fault on the motherboard with ref to power or something to that effect
Ok, cheers for all your help guys
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