Fix Your Stuff Community Store

Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

591 Questions View all

Options

Can I use a 9.1K ohm resistor instead of 9.31K?

Hello,

My motherboard is a 820-2936B

I bought a MacBook second hand with the logic board broken. I also bought 2 broken logic boards from AliExpress. But when i should replace the resistor with heat gun, it blowed away.

The resistor is R7011 in PPDCIN_G3H. And the replacement is R7912 in PM_SLP_S4_L.

I wonder if I can use a 9.1K ohm resistor instead of 9.31K? or will U7000 not start because of to small amount of power?

Sorry for my bad english.

Answered! View the answer I have this problem too

Is this a good question?

Yes No
Score 0
Add a comment

1 Answer

Filter by:
Most Helpful Newest Oldest
Chosen Solution

Options

In general, when you see a high precision resistor in a circuit, it’s because it’s important that the value be respected. The 9.31K resistor (U7011) is spec’d at 1% in the schematic. That means it’s measured value will be between 9.217K and 9.403K. If you look at the circuit, it is a voltage divider and the schematic says “Divider sets ACIN threshold at 13.55V “ so yes, it’s important to have the proper value.

R7912 is a 9.1K 5% resistor, which means it can measure between 8.645K and 9.555K. If you install a 9.1K resistor, you will most likely be out of spec. You could measure it directly, out of circuit, to see what the actual measurement is but even your multimeter has a margin of error. Still, if the 9.1K resistor falls within the proper range, you could use it.

The best solution is to simply buy a new one from Digikey, it costs literally 10 cents.

Was this answer helpful?

Yes No
Score 4
Add a comment

Add your answer

Oskar Bali will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 1

All Time: 134