> I have a PB3400 and the audio from the headphone doesn't work. It will > disconnect audio from the speakers, and the sound control panel knows when I > plug the headphones in, but there isn't a peep out of them. > > Is there any history with audio problems with the 3400 and audio? > > Thanks!! > Thomas Martin >
Yes, there is a known weakness of the 3400's audio out jack. I had one go bad while I was listening to it one day. Here is some info I have found about bypassing it.... --------------- > The sound out jack on my PB 3400c ceased to work today, either with powered > external speakers or headphones (both of which are operational) Anyone > experience this? Any thoughts would be appreciated. Sorry, but you got a defective motherboard now. I had the same problem ( and quite a couple of other people). I fixed it myself by rewiring a Line-Out signal, that is available on the PCI-slot inside (used for the optional Ethernet/Modem card) to the out-jack. This way you have at least a line-level out (NO headphones!) how to do it: get the Developer Tech Note for the 3400 from a Hotline server listed below You�ll find the pinouts of the PCI-slot on Page 38: pin 95 - MB_COM_OUT Pin 97 - MB_R_OUT Pin 99 - MB_L_OUT First you need a Torx 8 driver. Also use an antistatic wristband (connect it to ground on the motherboard). You don�t have to remove the motherboard to access these pins. But you have to disassemble the HD, charging circuitry, Modem/Ethernet-card and the CPU heatsink. The PCI-slot is SMD type and has VERY narrow spaced pins. You�ll need an SMD soldering needle, solid soldering skills (its all minature SMD stuff) a magnifying glass is recommended. I solderered one wire to pin 99 and traced pin 97 to a spot where soldering was a little bit easier. Pin 95 is not needed as ground is availiable at the output-jack. You can wire pin 97 and 99 to the output-jack by unsoldering its left and right signal pins and isolating them to the motherboard with some adhesive tape. After having removed the battery charging circuitry the PB will NOT restart from the internal battery. After reassembling you need to restart with the power-supply connected, by pressing the reset button on the backside of the PB for about one minute. The signal you have now on your reawakened audio-out is line-level, and can�t be controlled via volume-control, but thats the only backdraw there is. I use my PB with this mod for one year now without any problem. Warnings: DO NOT CONNECT A HEADPHONE TO THIS OUTPUT, THIS MIGHT KILL YOUR NEW AUDIO OUT FOR ALL TIMES !!! Leave this mod to a skilled repairman, if you�re not familiar with soldering SMD circuitry. ----------------------------------------------------------------------- -- PowerBooks is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
