pass through headphone jack help needed

If there's anything left of the old jack, you should be able to trace it out with a mini-TRS plug and a meter. If not, it should be available on eBay...or a dead mb. I expect every Dell is pretty much the same, though. I wish I'd seen this yesterday when I had my D400 apart for speaker replacement.

Carefully probing the connections--if you can run the computer disassembled--with a probe made from a set of headphones might tell you which are the input pads. That would be three out of (what should be) five: L-in, R-in, L-out, R-out & common. If you can get to the leads on the speakers, you should be able to check continuity to there to find which pads are the L-out & R-out and common....

Finally, a lot of Dell manuals are available on the web. Try to download one...any one, as per the above (identical parts).

jak

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grounds being 1 6 7 8

#3 appears to be a dead end trace, I turned the motherboard over and there is no trace leading away from it on either side of the board.

So that leaves us with 2, 4, and 5 with traces leading away from them. #4 has trace leading away on both sides of the board.

Hope this helps.

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Yes I can get to the leads on the speaker. There are four of them two for the right and two for the left. I tried a staight continuity test it gave me a stange reading not a 000 reading of continuity.

You'll have two leads on each speaker. One of each is probably common. The other two (red on my D400, but it only has one speaker) should connect to the jack.

If it's not a low resistance, then possibly the switch on the jack doesn't directly interrupt the signal to the speakers, but switches the speakers off electronically.

I'd be surprised if that's the case, perhaps someone else might know.

Do you not have the original jack? Easiest would be to check it for pinout--even if it's mangled. Personally, I'd not want to put it back together without it...too much trouble to disassemble if you want to fix it in the future. Jacks are available....

jak

Looks like a standard part to me so Mouser, etc?

gives the connection details.

--
*Isn\'t it a bit unnerving that doctors call what they do "practice?"

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.

Dave Plowman (News) Inscribed thus:

Hi Dave, Unfortunately that jack is not the right one ! it has four pins in line across the back.

The OP should check with the Dell manual for that machine.

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Best Reagrds:
                        Baron.

The Foxconn jack next to it is the same one I need. Anyone know how to find this jack?

Here is the manual for the computer:

grounds being 1 6 7 8

#3 appears to be a dead end trace, I turned the motherboard over and there is no trace leading away from it on either side of the board.

So that leaves us with 2, 4, and 5 with traces leading away from them. #4 has trace leading away on both sides of the board.

Hope this helps.

D

#3 may or may not be a dead end trace. Many modern motherboards are mroe than two layers (top and bottom). Some boards havemany layers stacked together. Example: My sony DCR-VX1000 camcorder has several boards that are 6 to 10 layers of traces.

Could this be a combined optical digital output/analog line out connector?

Regards,

Ravi.

,

Have you tried "Foxcon" ?

Watch for line wrap.

--
Best Regards:
                     Baron.

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Could be. I will paypal $2 to someone for a solution or a place to buy the correct jack.

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Yes I browsed there this morning, didn't see the jack I needed though... D

Help is here! I have just repaired an HP Pavilion N5412 laptop with an identical socket that had been smashed. The audio to the socket is separate to the speakers. Your pin 2 goes to the plug's ring, pin 5 goes to the tip, and ground pin 7 is common. Pin 3 makes contact with pin 5 when the plug is absent. Pins 1 and 4 are normally closed, but are open when the plug is inserted. Pin 4 goes to a logic gate pulled up to 5V via 100K, and mutes the speakers when the plug is inserted. There is a screening cover over the contacts, fixed by pins 6 and 8.

To make your speakers work, all you have to do is join pin 4 to ground.

Here in Surrey, UK, the only high street shop that has electronics components is Maplins. They have two types of 3mm stereo socket, different layouts but having only 5 pins - tip, ring, & common, plus 2 pins that make contact with the tip and ring pins when the plug is absent. They are obviously intended for circuits that feed headphones by breaking the speaker feeds, and don't fit your board.

In my case the socket was mounted on a separate board, so I used a piece of breadboard to mount the Maplin socket. As the tip and ring are fed via isolating capacitors to avoid putting DC on the 30 ohm headphones, I put 330 ohm resistors on the tip and ring pins to ground, to keep these pins at ground in the absence of a plug. I then connected a 6K8 resistor between one of the pins that make contact when the plug is absent, and the line to the logic gate. When the plug is absent the gate is pulled down via 6K8 and 330R, and when the plug is inserted the pull-down is disconnected, muting the speakers.

This worked, but gave trouble because audio peaks get to the muting logic and break up the speaker sound. To get round this I added a

0.1uF capacitor between the logic line and ground, to reduce the audio getting to the logic via the 6K8. However when powering up the computer, or inserting/removing the headphones, a very short squeak is produced. This is because the logic voltage rises slowly owing to the capacitor, and there is instability at the switching threshold. The capacitor value was a compromise between length of squeak and stopping speaker distortion.

My solution is obviously not as good as finding a proper socket.

Dave W

jakdedert wrote in news:Rrqpl.8820$b9.3380 @bignews6.bellsouth.net:

I don't know in this particular case but did 'fight' a problem with a laptop that I thought was due to a bad headphone connection. Even changed the motherboard. Didn't fix the problem.

Turned out to be software.

The danged OS 'beep' was driving me crazy. It would come out of the computer, LOUD, even when I disabled the speaker and turned volume all the way down. On previous laptops I had stuck a 'dummy' plug in the speaker jack to kill the beep but that didn't work on this one.

The 'beep' driver had to be disabled to kill the beep on that particular model because the software routes beep to the speakers even if the headphones are plugged in. 'Ordinary audio' would go the the phones rather than the speaker but the beep still went to the speaker.

So, yes, there are computers that use software to control where sound goes.

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bz    	73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an 
infinite set.

bz+ser@ch100-5.chem.lsu.edu   remove ch100-5 to avoid spam trap

Wow... You are the man. Finding the proper socket seems like finding a needle in a haystack. I think I will connect pins 1 and 4 and be done with it. As long as i have some sound, that is what matters. If everything goes good i will paypal you. Just email me your paypal address and i will get it to you.

thanks again.

D

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So 1 and 4 need to be connected but you mention 3 and 5 also are connected when the plug is absent. Do I need to connect 3 and 5 or just 1 and 4?

thanks!

re

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a n 2 g o s g

I hooked up pins 1 and 4 and I now have sound!

Dave W is the winner with the solution. Any "Fixit" websites want to grab my picture and the contents of this post feel free to do it.

Dave, send me your paypal and I will send you the $2.

thanks again!

D

dd5,

No need to reward me - my reward is knowing that my efforts have helped someone else as well as me.

I have looked for a proper socket on several suppliers including Farnell and Digi-Key without success. Although I did find a Schurter one that is panel mounted, with three contacts to tip, ring and sleeve, that make contact to three other contacts in the absence of the plug. The one that the sleeve contact contacts could be connected to the logic, so that it is ground without the plug and open circuit when the plug is in. However the socket is probably too big to fit in the space.

Regards, Dave W