M4800 Owner's Thread

Photos 2

 

Photos 3, Screen changed, palm rest changed and chassis changed. Screen is B156HW01 v.4, Old screen was 720p so LVDS cable was changed as well. No problems whatsoever with this screen.

 

ok so i replaced the lcd cable and the panel and it worked for about 16 hours and now it's back to only showing an image when the switchable graphics is enabled and in the diagnostics its shoing image in the top 2 inches only and its mirrored stating EDID failure. It has to be the motherboard right? i just dont understand it it worked perfectly with a new lcd panel for a couple hours why would it suddenly stop working again?

 

No idea but I've just transplanted a B156HW01 v.4 out of a Lenovo W520 into my M4800 (Quadro K2100) and it's working fine on W10 LTSB for the past 3 weeks.

Why did you change it in the first place? Just for the upgrade or was the 1st panel non-functional?

 

Because it was giving me EDID EEPROM failure so i replaced the lcd cable and it didnt fix it so i got a cheap lcd and it did fix it temporarily but its now messed up again.

 

See this page and the next couple - some 1080p IPS panels do not play nice with the m4800 for some reason and you need to disable switchable graphics in the BIOS to get them to work:

http://forum.notebookreview.com/threads/m4800-owners-thread.736032/page-176

 

How should we know, without any mention of the price?

Does it work for sure?

For $5, definitely. For hundreds, probably not.

 

I have one question for the M4800 users which have upgraded their GPU to Maxwell generation. Recently I've updated my M4800 to a K2200M (GM107, 2GB) GPU running on pretty old A09 BIOS but newest NVDIA Quadro driver (inf modded) for having full GPU performance. With newer BIOS versions the GPU will not reach the boost clock due to an unknown reason.

Everything is working fine so far and according to the nvidia taskbar item for optimus activity it seems that also switching between Intel and NVIDIA is working as expected. But power consumption is still too high. The mininum battery draw I can achieve is around 12W (display at minimum, keyboard backlight disabled). I'm pretty sure with the old K1100M the minimum battery draw was around 7W!

So I assume the NVIDIA card ist still sucking some juice from the battery even it's logically disabled. Is someone familiar with a situation like that and more important has a solution for me?

 

Hello all,

I have a M4800 (i7 4800Q, 16gb DDR3L (matched 8GB sticks in A/B slots), K1100m, 500gb SSHD, FHD, no disk drive. Bought refurb on eBay, but it's in beautiful shape, no cracks, dead pixels, scratches, etc.

Only issue is it only boots like once every 40 times or so. Otherwise, power and diag LED's come on and the screen stays off. Diagnostic blink says is HD off, power flashing, wifi off (RAM not initialized as per manual).

Have tried all manner of ram configurations, removing the drive, full power down and discharge, diagnostic boots, the works, but it still only boots once about every 40-50 times from cold (warm reboots fine). Once it does boot, it runs fine (24+hours straight, loads, battery, the works) and passes all Dell diagnostics in the pre-boot tool.

Tried replacing the CMOS battery as I've read that can be the issue sometimes, but no go.

Any ideas? Similar experiences? I still have a seller warranty on eBay to return it, but I love this model.

Thanks

 

Hello, people!
I have some questions to all owners of M4800, who got FullHD IPS display in it.
I have read all the topic, and, as I know, there are only two models of stock IPS: LP156WF6-SPB1 and B156HAN01.1 (at least with 72% NTSC gamut).
Anyway, who got these screens, can you answer me on the followed questions?

What about backlight bleeding and glow effect in these screens?
What about PWM (backlight flickering) in all the adjustment range?
What can you say about color gamut, black level?
I also would to know, how do you feel your IPS screen when you're working with it. Maybe eyes getting tired, headache or so? Any other claims?

Thank you for any help!