It is currently Sat Apr 21, 2018 4:04 pm

All times are UTC - 8 hours




Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: LCD Coil Whine
PostPosted: Fri Aug 31, 2007 2:44 pm 
Offline
SPCR Reviewer

Joined: Tue May 30, 2006 8:22 pm
Posts: 561
Location: Vancouver, BC
I recently picked up two 20" Acer monitors (AL2016W) and the screens themselves are great. My only beef with them is that there's what seems to be coil whine for about 10 seconds when they're first turned on, or resume from standby mode.

Anyone know if there's anything I can do to eliminate this?

TIA.

_________________
Zxian.org || Kwikpiks.com
Workstation || Server


Top
 Profile  
 
 Post subject:
PostPosted: Thu Sep 13, 2007 5:23 pm 
Offline

Joined: Wed Feb 14, 2007 5:22 pm
Posts: 7
Possibly, although it would require you to open the panel and void any warranty. I know a few people have had limited success damping vibrations in inductors by applying hot glue to them.

My BenQ Fp737s-d (rather old by this point) often makes a high-pitched whine while in standby or turned off (but with the power cord still connected). Unfortunately, there aren't really any easy fixes.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 21, 2007 4:53 am 
Offline

Joined: Sun Aug 11, 2002 3:26 pm
Posts: 191
There's something called "coil lacquer" that was used by old-timey TV repair shops to quiet coil whine. No idea if it's still available.
note
- coils are OK with running hot, so don't worry about reducing cooling
- if you're thinking about doing this for a CRT, and don't already have an idea what parts are high voltage, please don't open the case. You could get a really nasty shock - possibly fatal. If you can find one of those old time shops, take the monitor there instead.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Sep 21, 2007 6:24 am 
Offline

Joined: Mon Apr 25, 2005 10:00 am
Posts: 2131
Location: Grand Rapids, MI
It's probably just the inverter warming up. It's the same reason fluorescent lights (which is what the backlight in the LCD is) buzz in a ballast. If the sound goes away after a few seconds, consider yourself lucky. Most inverters buzz all the time or not at all.

Does changing the brightness output of the display change anything in the pitch of the sound? How about changing colors of the backdrop from lighter to darker?

_________________
HTPC: OrigenAE X11|Gigabyte GA-MA785GPMT-UD2H|Phenom II x3 740BE w/AC Freezer 7|150GB Velociraptor|Corsair VX450
Main: Antec 300 (SlipStream @ 800rpm/140mm @ 5v)|Asus M4A88TD-M|Phenom II x4 945 (Mugen2 pass.)|Asus EAH6850|Samsung 830 128GB|Antec TP750
WHS: DF-85|P8H67-M Pro|I5-3450S/Hyper 212+|Corsair AX650|Sandisk Extreme 240GB, 2xWD20EARS, 2x WD15EARS, WD15EADS


Top
 Profile  
 
 Post subject:
PostPosted: Sun Sep 23, 2007 2:17 pm 
Offline

Joined: Mon May 23, 2005 12:04 am
Posts: 274
I know 2 more LCDs that do (buzz when powering up/changing res) - mine

But since it's only for a moment it's easier to simply ignore.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group