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Subject: AJBR20 dead - seems like VCC is not generated
Date: 2004-07-19

Hi forum,

until now I was just a silent listener to this forum but now I do have
have a serious problem with my AJBR20 (upgraded to 80GB and it worked
fine for several months).

The unit is dead - nothing happens when either pressing and holding the
ON button or connecting the charger to the unit.
It happens during a normal play when a song was just "paused". When I
pressed PLAY again it didn't work so I pressed OFF and the unit turned
OFF and since that I am unable to awake it again - strange.
As I am a bit experienced in electronics I decided to open the unit to
see if something was obviously damaged - guess what - nothing obvious.
I also looked at the schematics from the Rockbox Homepage but it seems
that my unit is different.
Interface board is Rev. V2.1B.

>From the schematics from the Rockbox homepage I thought that one of the
Transitors T1 or T2 (named 022G) might be damaged or the LM2651-3.3
because it seems that VCC is not available. At least I cannot measure
any voltage (beside some "noise") on the coil L2.
The problem is that I cannot locate neither one of the Transitors nor
the LM2651-3.3 on my board.

I wondered if one of you guys might be able to help or can give a hint
where to look at.
If it is of any help I can create a picture of the Interface board and
send it to someone.

If would really like to revive my recorder again ...

Thanks for any feedback in advance


Page was last modified "Jan 10 2012" The Rockbox Crew