Problem of his Palm t5 (research)

Hello!

Two days ago my t5 palm stopped play sounds via the internal speaker (his helmet seems to be ok). Posts on this forum say that it is a hardware problem (micro-switch is stuck in a headphone jack). At least in my case, I need a more complex explanation:

-The internal speaker stopped working without any interference in the headphones (I do not plug headphones into the Palm). Most people have this problem after disconnecting the headset.

-J' was able to set my speakers to life by simply plugging in the AC adapter / CC. President Ping with a usual sound and worked for a few hours, that dies again.

-At least twice, I could hear sounds after a hard reset. But only until I tried to launch any application. Then he was silent again.

-As for now, I hear 'clicks' of the speaker when I connect my T5 to hotsync cable and press the hotsync button. Still more - if I have press the hotsync button while the cable is not plugged into the USB port - and wait 30 to 40 seconds, I see a box with the message "hotsync failure" alarm and can hear the sound of the mono speaker alarm Palm. So it is again being mute.

With a background in electronics, I opened the unit and checked the sound elements visible:

-L' speaker is OK, the measured resistance is recommended on the speaker (7.8 vs 8.0 ohm)

-Points of motherboard are OK

-There is a voltage V 1.68 on the two points vs. the ground, but no difference in voltage between the pads.

-5-pin headset plug seems to be OK. Microswitch pads (two pads on a basis of a Jack) have no resistance measured when the socket is empty and are disconnected when headphones are plugged in.

-J' have tried to short-circuit buffers with external cable - but no effect dip switch - sound is always redirected to the helmet.

-J' tried to connect the internal speaker to the headphone channel. It works, but the rate of release of palm is unacceptable (headphones are devices to 30 ohms, and I believe that internal speaker is connected through some elements of energy saving).

I'm completely perplexed with my problem of his palm. This may not be a pure hardware problem as he plays sometimes a few sounds via mono speaker. But if this is a problem in a software - how in hell, he survives device resets?

Any ideas?

Hello!

Indeed, the problem was multiple connector. It seems that cable flat keyboard connection and connector multiple base with a main card had isolation deteriorated between some of his sons and a surface of steel on the base. Now, I remember that some time ago my Palm was irregularly to hot-sync mode even when the hot sync cable was not plugged.

After that I put a piece of insulation between the metal base and a flat cable (which covers the hard edge of the base metal) mono speaker returned to life. Please put this in a FAQ or KB if possible.

It would be nice for palm-engineers (if palm still has some) to build a utility program that allows the user to select the device audio default substitution of the system. See cool head for treo on sourceforge (does not work on palm t-series).

Thank you!

Message relates to: Tungsten T5

Tags: HP Tablets

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