Technical Support Macbook pro A 1286 (820-2915)

[Tara Laptops]

The motherboard keeps on restarting. +5v keeps on restarting. (+5v goes to 0v and again goes to 5v). On power ic ie: Tps 51980. +3.3v keeps on fluctuating from 3.3v and 0. slp4 from pch is fluctuating. Rsmrst is steady 3.3v.
now if i remove the Ram and apply the power , all voltages remain steady.
Any idea what should i do ?
Pls reply.
Thanks

 

[Tara Laptops]

Sorry forgot to write. On power ic Tps 51980 pin number 4 ie: enable pin of 5v is fluctuating.

 

[Hosein Asadolahi]

The motherboard keeps on restarting. +5v keeps on restarting. (+5v goes to 0v and again goes to 5v). On power ic ie: Tps 51980. +3.3v keeps on fluctuating from 3.3v and 0. slp4 from pch is fluctuating. Rsmrst is steady 3.3v.
now if i remove the Ram and apply the power , all voltages remain steady.
Any idea what should i do ?
Pls reply.
Thanks

if when you remove ram and switch on the laptop all voltages is stable , its means cpu or gpu or bios have problem . Because one of that components have problem and prevent to complete boot . reprogram bios and test , try dis to uma or replace gpu and test .

 

[Tara Laptops]

reprogramed the bios. no benifit. how to convert graphic to non graphic ?

 

[Hosein Asadolahi]

reprogramed the bios. no benifit. how to convert graphic to non graphic ?

Dis To Uma

 

[Tara Laptops]

820-2915-b . how to convert it to non graphic

 

[Hosein Asadolahi]

820-2915-b . how to convert it to non graphic

link : Dis To Uma

 

[Tara Laptops]

Hi Hosein, to convert 820-2915 from graphics to non graphics i have to remove U9600. What about U8000. ? I dont have to remove u8000 .? For the first time i am doing this dis to uma. I am confused.

 

[Hosein Asadolahi]

Hi Hosein, to convert 820-2915 from graphics to non graphics i have to remove U9600. What about U8000. ? I dont have to remove u8000 .? For the first time i am doing this dis to uma. I am confused.

I explained everything in that post. you must remove gpu chip . why you confused ?