820-2915 Motherboard starting and then suddenly shuts off?

[patrickribbsaeter]

820-2915 Motherboard starting and then suddenly shuts off?


Any suggestions pls?

Thanks.

 

[patrickribbsaeter]

Now it doesnt start anymore...

 

[patrickribbsaeter]

1. I have Green light on charger.
2. I have 3.42v on SMC_B_ACOK
3. I have 3.42v on PIN 5 ADAPTER SENSE (U6900)
4. I have CHGR_ACIN shows 4.0v
5. I have 12.6v on FUSE 7040 which goes to system.

Still NO FAN SPIN and no start,

Is there anything I'm missing from here?

 

[2informaticos]

Do you have original 85W charger?
Does it charge battery, or starts when battery and charger are both connected?
Touch SMC_ONOFF_L to ground and see reaction on PM_PWRBTN_L.
Post values for SMC_ADAPTER_EN, PM_BATLOW_L, PM_RSMRST_L, PM_SLP_SUS_L signals.
Any fault history?

 

[TCRScircuit]

History? Random powering off will suck. Could be corrosion under something or some corroded pad or resistor somewhere. History is going to be the most important thing here.

 

[JohnB8812]

If it was booting then shutting off, the GPU is likely dead and this is gonna be a waste of time.

 

[TCRScircuit]

^ This. I thought the OP meant quarter fan spin

 

[dukefawks]

Likely GPU is dead and you are not using a 85W charger. Let the battery charge up so you have a few lights on the battery indicator, it should then be able to power from battery even with 60W charger.

 

[patrickribbsaeter]

Thanks everyone for your feedback.

I followed Duke advice.

I recharged the battery full with 60W charger. (Im buying 80W tmr).. The computer boot now, apple logo comes on, and the load bar. But that remains only for 3 seconds then computer shuts off again.

Any suggestions on that?.. Could it be GPU, and if so, how can I check that. Is it possible to reflow the GPU a bit? Ultrasonic will that help? or is it bye bye with this motherboard and only use the spareparts for future work?

HISTORY: The computer is NOT water damaged.

 

[TCRScircuit]

Sounds like a dead GPU. If its not liquid damaged, UC'ing it won't do a thing.

 

[patrickribbsaeter]

Sounds like a dead GPU. If its not liquid damaged, UC'ing it won't do a thing.

Thanks buddy.. really appreciate your feedback.. I shall wait for Duke feedback as well and see what he says.. once again, thank you for helping out.

 

[JohnB8812]

The computer is hanging on boot and shutting down because it is the 820-2915’s way of saying I’m fucked lol. This model is notorious for that exact symptom being caused by a dead GPU. You can replace it, but good luck finding a real GPU

 

[patrickribbsaeter]

The computer is hanging on boot and shutting down because it is the 820-2915’s way of saying I’m fucked lol. This model is notorious for that exact symptom being caused by a dead GPU. You can replace it, but good luck finding a real GPU

Thanks JohnB8812 for your feedback. I have similar motherboards with functioning GPU. Do you recommend I should take it from the board with functioning GPU and place it onto this damaged one?

Real GPU? can u recommend any websites? Aliexpress perhaps?

What about REFLOW?

 

[dukefawks]

Tried booting from a known good OSX through USB? If that has the same result it will be a dead GPU.

REAL new GPUs are unobtanium pretty much and reflow is bullshit and only temporary.

 

[patrickribbsaeter]

No Title

I tried boot from good USB osx.. And i got this.. I guess the GPU is gone for ever?

The motherboard gets warm really fast and starts smelling burned close up..

 

[dukefawks]

Dead GPU as usual.

 

[patrickribbsaeter]

Dead GPU as usual.

Ok, thanks Duke.. This goes to spareparts section..

 

[dukefawks]

I need those boards! If you are in the EU I will buy it from you.