Originally Posted by Szadek
Well, needless to say you've voided any warranty you may have had.
On the other hand, hopefully you used proper ESD precautions/equipment.
Also, it seems you may have went overboard to remove the power on password (in many instances, disconnecting the RTC battery and shorting the two pins on the systemboard with no power connecting will remove it)
Well, try an external monitor, if no video, I'd say there are 3 main components that can cause no video. Memory is the most common, System board being the 2nd most common, and CPU being the 3rd.
Also, in some cases the w/nic card can cause the issue, but that's rare.
I think he all ready said the notebook works with an external monitor if I read that last sentence right.
I am sorry but you have not really said much in your post like what you tried and that puts the burden on those who want to help to do all the typing instead of you.
I will ask the obvious since you have not stated such, have you cycled the screen to LCD, ya know, for the HP it is usually the "Fn" key and a top row key, usually F4 which has the blue screen logo.
I will leave it at that until you type some more of what you tried.
....Oh by the way nice job with the BIOS lock chip changeout. Was it hard? Is this a surface mount chip or a regular pin chip and easier to remove/replace?
As for warranty, unless you bought the extended comprehensive, like $400 plan, forgetting your password is not covered under warranty beyond the 30 day satisfaction guarantee warranty.
I know of one person who had Compaq fix his, they said they had to reburn the chip or replace it or something and it ran him that standard $285 or something. I have read also a thread that talked about an HP that was sent in (ya same company) and they said they had to change the motherboard out because of this-but it was covered under that comprehensive warranty allegedly.
Let us know what else you tried and whether your graphics card is integrated to motherboard.
Since external LCD works it would seem to narrow it down to Video card out/LCD cable/inverter/backlight (can check with flashlight and look for faint image on screen)/LCD panel/loose connector.
My vote is a loose or forgotten connection as you are obviously a very competant person to change out a chip like this and I always seem to do something so simple like this in such tear downs.
Slight chance it could be something else like a BIOS issue as there was a old problem with the compaq X1000 failing to turn the LCD screen back on after going into hibernation (they would say to do a system reset by pulling AC/Battery/then holding on button down for exactly 40 seconds-but did not say to remove the cmos battery-but who knows). This since fixed with BIOS update (which I don't recommend till you have a stable system).
Probably easiest thing to do is swap a known good LCD assembly with yours and see if there is the same problem, at least you can narrow it down to YES or NO to LCD panel assembly. This is what they would do at HP to diagnose at this point if external monitor works.