-   Mac, iPhone, iPad and iPod Help & Troubleshooting (
-   -   Apple Cinema Display 23" (PCB Q49C or info about transistor) (

issic Feb 7th, 2010 07:08 PM

Apple Cinema Display 23" (PCB Q49C or info about transistor)
2 Attachment(s)

looking for info about Apple Cinema Display Power Board. Mine is burned out. Actually maybe only one transistor. See attachment.

Looking for PCB Q49C V115 (main powerboard) for replacement for 23" ACD HD


Info about what is WRITTEN on that TRANSISTOR (where the red arrow is or the one burned in the detail photo) if somebody can open or have open your 23" cinema display and let me know...Position of the transistor is "Q1"

Any help appreciated.

sim Sep 18th, 2010 05:49 AM

Hello! I am investigating another monitor with a similar broken board. The 3.3V regulator was shot but it also seems that the transistor you mention is shorted and the (LM)2672 nearby also has 0V on all pins except Vin (probably also shot). The transistor in your picture reads "HEVQ9" on mine, but I am not sure what that means. Any luck on yours in the meantime?

issic Oct 27th, 2010 06:09 PM

No no luck. it sits in corner disassembled for the 9 months already. Anybody know or have a part Q4849C-M1.BRD ? I will buy it...

sim Oct 27th, 2010 06:28 PM


I did manage to get mine working. It turns out it was just the regulator, and the circuits around it which were reading 0V are 0V until the monitor gets a video signal.

Do you still need a pic of that transistor? I forgot to get one for you specifically, but here is one slightly out of focus one of my post-mod: (look on the very edge).

What is part Q4849C-M1.BRD ?

Cheers :)

issic Oct 27th, 2010 06:36 PM

Hey congratulation! Q4849C is the whole logic board. or 0171-2282-2281.

I found out just one on Ebay! But they will not ship to Europe. Damn! And I couldn't find a way to contact the seller. He has no EMAIL ADDRESS!!! Not even on his original websites! Even on TWITER I can't find it! Grrrrr I'm so close and far away....

Apple 23" Cinema Display HD Logic Board - eBay (item 270630615845 end time Nov-02-10 11:01:26 PDT)

That's THE PIECE! I want it and pay 200$ or more! Damn!

issic Oct 27th, 2010 06:48 PM

Hey Sim, can you get some values out of that piece you described please "HEVQ9"? What kind of transistor this could be? The number on it didn't return any results.... so I may find something similar and just solder it there...any idea?

sim Oct 27th, 2010 08:33 PM

He seems to be hard to find, but there is a phone number on Maybe try that? Kind of sucks to pay that much if all you need is a transistor, though. I'd probably rather look for a dead monitor at that price. Chances are you could steal just that part or find out what it is and maybe get two working monitors. :)

I'll have to take mine apart again to check out that part, which is kind of a pain. I'll see if I can find some time to do it.

issic Oct 27th, 2010 08:35 PM

Sure understand, it is pain :-) It's good is working. If you have any info what kind of transistor is it and possible replacement, let me know. Thanks Sim.

kkmanuele May 17th, 2011 09:21 AM

hi, i'm italian. sorry my english, but i have some problems.
My transistor q1 is down, my q1 is H6FU9 on mine, but I can not find anything with this symbol !
can you help me?

kkmanuele May 18th, 2011 04:59 AM

hi guys!!
i have found this documents, vq9 is SC70!!!
but were i found this transistor??

All times are GMT -4. The time now is 02:02 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 RC 2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright 1999 - 2012, All rights reserved. ehMac is not affiliated with Apple Inc. Mac, iPod, iTunes, iPhone, Apple TV are trademarks of Apple Inc.