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Versión actual por: mayer (detalles del voto) ,

Título:

Intermittent power up - A1342

Texto:

Hi all,

I have a problem with my Unibody white MacBook. I'd like to know if anyone would be able to help me fix it!

It was involved in a very minor liquid spill - almost nothing - but now it won't power up all the time. I've investigated it as much as I can and am at the end of my knowledge now.

The symptoms are this:

Connecting the Magsafe works properly and charges the battery. On pressing the power button the light on the magsafe changes to green for a few seconds then back to orange (PMU Reset?) 80% of the time nothing else happens.  The other 20% of the time on repeated pressing of the power button (sometimes in quick succession - sometimes just a standard press) the unit will power up. Some keys do not function properly but backlight and everything else are fine.

On a *single* press of the power button while running (this happens every time) the unit goes *straight off immediately*

I have shorted out pins 5 and 29 on the keyboard connection and the same lack of regular power up is observed so I don't think there is a power button fault (and also because the power button will switch the unit off 100% of the time as above)

The fact that the PMU/SMC appears to be being reset when pressing the power is significant but I don't know in what way. I initially thought the shift and alt and apple keys might be stuck down but it happens when the keyboard ribbon cable is disconnected too.

It must just be an intermittent connection somewhere and hopefully not too serious as everything 'works' albeit occasionally!

Can anyone give me a shove in the right direction? I am handy with a multimeter and have a reasonably good solder station. Perhaps some fuse/component testing if you'll tell me where to look?

Many thanks

Ryan

Dispositivo:

MacBook Unibody Model A1342

Estatus:

open

Respuesta Aceptada:

+71886

Aporte original por: Ryan Maunder ,

Título:

Intermittent power up - A1342

Texto:

Hi all,

I have a problem with my Unibody white MacBook. I'd like to know if anyone would be able to help me fix it!

It was involved in a very minor liquid spill - almost nothing - but now it won't power up all the time. I've investigated it as much as I can and am at the end of my knowledge now.

The symptoms are this:

Connecting the Magsafe works properly and charges the battery. On pressing the power button the light on the magsafe changes to green for a few seconds then back to orange (PMU Reset?) 80% of the time nothing else happens.  The other 20% of the time on repeated pressing of the power button (sometimes in quick succession - sometimes just a standard press) the unit will power up. Some keys do not function properly but backlight and everything else are fine.

On a *single* press of the power button while running (this happens every time) the unit goes *straight off immediately*

I have shorted out pins 5 and 29 on the keyboard connection and the same lack of regular power up is observed so I don't think there is a power button fault (and also because the power button will switch the unit off 100% of the time as above)

The fact that the PMU/SMC appears to be being reset when pressing the power is significant but I don't know in what way. I initially thought the shift and alt and apple keys might be stuck down but it happens when the keyboard ribbon cable is disconnected too.

It must just be an intermittent connection somewhere and hopefully not too serious as everything 'works' albeit occasionally!

Can anyone give me a shove in the right direction? I am handy with a multimeter and have a reasonably good solder station. Perhaps some fuse/component testing if you'll tell me where to look?

Many thanks

Ryan

Dispositivo:

MacBook Unibody Model A1342

Estatus:

open