CD_In connection on board

Ibm / lenovo / 8143
September 15, 2009 at 12:39:44
Specs: Windows XP
I would like to know where on the board (FRU 29R8260) do you connect the 4-pin analog audio cable coming from a cd-rom? I can see only one spot where it can connect, which has 10 pins +1 loner sticking up from board. (IBM or Lenovo was no help! No info in manuals)

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September 15, 2009 at 12:53:09
If your computer is relatively new you don't need to connect the data cable. The sound is carried through the DATA cable.

Any port for the CD sound on the baord will not have pins at all. Will be a small socket and will be identified as CD or sound in.

Did you try playing a CD to see if the sound already works?

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September 15, 2009 at 14:03:33

"If your computer is relatively new you don't need to connect the data cable. The sound is carried through the DATA cable

Actually, that's determined by how old the optical drive is. E.g. ! have CD-Rom drives that were made in 1999 and earlier and they are able to send all audio to the mboard through the data cable on mboards that are as old as 1995.


If you're not getting regular CD audio when you have no audio is cable connected to the CD drive, if the CD drive is not ancient, you need to change a setting in XP so everything goes through the data cable.
Device Manager - DVD/CD-ROM drives - RIGHT click on the name of the drive - Properties tab
click on the box beside Enable digital CD audio... to insert a checkmark if there isn't one there.

If that's not there or if it is but it's greyed out, your CD drive is ancient and doesn't support that, or, your mboard is so ancient that it doesn't support that. .
In that case, some sound cards (that you install in a ISA or PCI slot) have the pins you're looking for.

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September 15, 2009 at 15:12:56
The 4 pin connnector is for an anolog signal. Although newer computers take the signal digitally from the data cable new drives still have the connector even SATA ones.

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September 15, 2009 at 18:23:13
As in, the audio cable connection only outputs audio for legacy audio CDs, nothing else.

Hardware Maintenance Manual March 27 2008

Page 121 - start 8143 section
page 124 - mboard connections

parts starting page 204

page 207 - System board - mboard - FRU 41X8329

I searched it
- FRU 29R8260 - not in manual
- no mention of audio cable or connecting it or disconnecting it for the CD or DVD drives
- cables - many cables, none obvious for audio or sound
"has 10 pins +1 loner sticking up from board"
- pins - no mention of pins on the mboard for that - only pins mentioned are clear cmos pins

When I searched the Lenovo site with: 8143
I got
ThinkCentre M51

Apparently FRU 29R8260 was used in several models

FRU System board- 10/1000 Ethernet- with POV- DDR1 for ThinkCentre 8095 -29R8260-06

Including ThinkCentre M51

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September 15, 2009 at 23:03:16
Except for maybe a really old cdrom it's the player software and not the cdrom that determines if you need the analog cable. 9X and I think, ME, have a default cd player. I'm not sure about XP and newer OS's as I'm on the 98 machine right now.

When using the default player you must have the 4-wire cable connected as it pretty much just passes the signal from the cdrom to the speakers with little or no processing by the sound card. I had an old P-I with an ISA sound card and could play cd's even when booting straight to dos. (I tried it on this P-3 with on-board sound but it didn't work.) As already mentioned, most other player software--WMP, winamp, etc--process the signal from the IDE cable so the 4-wire cable isn't needed.

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October 7, 2009 at 09:30:45
Thanks guys for your quick responses. Sorry that I haven't been able to respond sooner.
I got the cd/dvd audio working directly thru the data cable. So the hardware is not too old. (Great computer this IBM THinkcenter M51!)

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October 7, 2009 at 11:27:26
We're glad you got it going. Thanks for posting back.

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