M6600 Owners Thread

Has there ever been a solution found for relieving the LCD squeal coming from the upper right hand corner on the IPS RGBLED?

I've noticed that since enabling UEFI it is somewhat more noticeable and this with the battery not installed.

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Putting my ear to it during drive activity is when it gets really bad. Interference from Samsung PM830?

 

Nothing solid on the M6600, but I did change the LCD numerous times and finally found a panel that was somewhat quiet on AC... I still think it is a dirty voltage line feeding the panel back-LED's. Some 0.1uF caps on the VCC lines to the panel may help.

With that said, I have been testing a loaded M6700 Covet and although it has the same exact IPS LCD panel as the M6600, it does not make the noise. It may be the clear Gorilla Glass 2 screen protector they install in the (better sealed) LCD assembly on the Covet or it could be a better display interposer card. I "may" investigate the M6700 and document the differences, if any.

Scott-

 

It probably have something to do with the backlight, it get louder when brightness increase.

 

Really great to see you post again Scott!!!

Yes, I can squeeze the panel w/ thumb and index finger and it somewhat relieves it. I may take the bezel off and see if I can put some kind of damping material around there.

I don't understand circuits too well but I noticed during logon during transition from background to desktop image there is a severe squirreling sound right at that spot if I'm close enough. I'll be getting another Samsung Pro 840 SSD soon so I guess I'll eliminate that if it continues.

Does your 6700 have the PM830 SSD or something different?

 

Good to see you again too. :thumbsup:

During boot up, the video driver has not yet been loaded so you are probably hearing the different frequency [refresh rates] kicking in as the system loads the .sys display driver and progresses to the home screen. My M6600 system is basically the same as yours regarding the SSD's. I have:
Pro 840 Series 256GB as primary
830 Series 256GB as secondary
and another PM830 128GB mSATA as my OS backup/image drive

So far, I have not noticed or recorded any interference or audible noise coming from any of them.

The M6700 has the stock Dell 128GB (PM830) OS drive and a Western Digital Black mechanical storage drive in it.

@ baii
Yes, as I noted, I have tracked it down to the top right corner where the display's backlit voltage input is located. This comes from the ribbon cable on the left side of the first pic below and is interfaced to the interposer card via the white dual row header connector also on the left lower side of the pic [...or the bottom right side in the second pic below showing the rear/front of the interposer card itself).

Scott-

 

About 10 Yrs. ago had a car accident that lead to somehow getting a perforated ear-drum shortly after on right side, and I also intermittently get Tinnitis; Combine this with the LCD squeal and I'm feeling exasperated.

The original hard-drive was sufficiently noisy enough to drown it out I think,

It is true that during POST when the backlight receives the power it begins the initial noise. I just started testing to see if that squirreling noise happened at the LCD location during web page changes and it does. Of course it shouldn't have any correlation to the SSD, though the noise sounds like it is accessing a drive. It could be just switching pixels.

The reason I'm curious about the SSD is that (despite the proprietary firmware of the PM830, and I can't test the current retail Pro 840 as the boot), when installing DDPA - and this is the only time the SSD ever makes any audible noise - it actually screeches when the installer starts up. There was an issue where there was some sort of firmware patch from Dell for the PM830 to handle DDPA functions but I can't remember exactly.

The other interesting thing is that it seems to have worsened a bit running the UEFI/GPT as Boot drive. Whether the drivers interact there more I wouldn't know.

Regardless though, like you said it is probably either something dirty in the circuit or they're just doing a better job of sealing the LCD.

Since you didn't have much luck switching out panels, I'm not going to put myself through that mess. When I get the new SSD that will either help it or I'll be practicing my silicone application skills trying to dampen it. Gotta try something

 

New: BIOS A14 for Precision M6600 (7/31/2013)

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Fixes & Enhancements

1. Updated to the 1.5.33 version of the Intel PXE OROM.
2. Addressed Trusted Execution issue with CCTK on non-TPM configuration.
3. Addressed extenal USB keyboard LED abnormal issue.
4. Addressed UEFI OS fail boot with HDD password present issue.

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EDIT:

Wondering what some of the acronyms stand for? Yeah, me too:

CCTK

PXE OROM

UEFI (I already knew this one)

 

may be some one knows p/n of gpu fan?(

 

I think it's part of the GPU heatsink. 7JMFV

 

Hey Lnd, this maybe?

Whoa - Big whoops!

7JMFV[/span]
1[/span]
HEATSINK..., W/FAN, NOTEBOOK..., GRAPHICS..., M6600[/span]

----BTW, that's from the 1st. config. below, Quadro 4000M



Edited my cut and paste job above - Myx has it right. Sorry about that!