Help wanted with 2009 macbook pro no power

[izzzzzz6]

Hi Guys. Hopefully i got this right and my post is in the correct place. I suck at forums. It took me an age to find where to post this question

I was just about to sell my old macbook pro when it died on me. I can't find the boardview for this machine but i found a similar one. Board is 820-2565-A

Battery seems to be charging ok and indicator lights seem to be working. No fans nothing, everything else seems lifeless.

I found a blown white fuse near to the display connector. On the other similar boardview i have this appears as a diode D9701 is the closest thing i could find to the white fuse i have. Seems to be linked to the backlight but i have no boot up let alone backlight issues.

Causes might have been, old battery pulling constant current or perhaps some metalic crap i found magnetically stuck to the magsafe port.

I didn't check all voltages as i am not really sure where to test but i saw what might be V in 12. something volts near to U7200 but not much else going on around here.
I also found 3. or 4. something volts (can't remember now) on a 3 legged component by the top edge near the display connector and near to my white fuse.
I don't want to keep comparing to components in the board view i have as it is not exactly the same.

The blown fuse is baffling me as i don't know what it does or where it go's. I am assuming it has something to do with the backlight connector but why would it blow and also the board not be booting up?

One side of the fuse measures short to ground, this seems a bit strange to me but perhaps it's supposed to be like that?
I didn't want to bridge it as
A. I don't know it's value (is it the 6A fuse?)
B. I don't want to blow anything else, if something after the fuse is shorting to ground then the fuse will simply blow again.
Mission is to find out more about this fuse and find out if some other component has shorted.
Has anyone seen a similar problem with the 2009 or perhaps the 2010 Macbooks?

EDIT: I have just attached an image i found online. Please ignore the missing component outlined and look for the white fuse on the top right.

Thanks.
James

[dycc]

Re: Help wanted with 2009 macbook pro no power

Use this

[dycc]

Re: Help wanted with 2009 macbook pro no power

c'est sur que tu sauras maintenant si t'as réellement affaire à un fusible un condensateur non polarisé ou ......

[RobertJB66]

Re: Help wanted with 2009 macbook pro no power

Hi Guys, i'm working on an 820-2565-A board.

I have done a number of measurments and it looks like the power is gone rather quick.

I have checked the variouse powers related to the PBus Supply & Battery Charger (page 64 of the diagrams.) (see attached my results.

PPDCIN_G3H = 17.1 V
PPDCIN_G3H_INRUSH_FET =17.1 V
PPDCIN_G3H_INRUSH = 16.8 V
PPDCIN_G3H_CHGR = 16.7 V
PP5V1_CHGR_VDDP = 5.1 V

PP3V42_G3H = 0 V
PPVBAT_G3H_CHGR_REG = 0V
PPVBAT_G3H_CONN = 0V

Fan is connected to the board, no battery only the Mac Safe, no green light.

Does one of you a sugestion what to do?

thanks