QALA1 LA-7762P What are the coils?

[magicpc]

Hello, I found the LA-7762P motherboard described as turning on once rather than once.

I checked the coil resistances and the two coils had 4ohm resistances. After desoldering, I already have 9kohm. The only question is what to replace them with? How to find out which coils to use? The diagram and the view of the board did not help me much. Coil marking on R36J 1226F.

[mon2]

Re: QALA1 LA-7762P What are the coils?

Wait.

Can you clarify how you are measuring the resistance ?

If you are using the multimeter across the legs of the coil then yes, the resistance of 4 ohms or similar are OK.

The coil is just that, magnet wire over a bobbin.

It is rare for coils to be damaged.

Or are you measuring with the resistance to ground - one meter lead on the coil; other meter lead to ground of the logic board ?

[magicpc]

Re: QALA1 LA-7762P What are the coils?

Black probe to ground on the motherboard and red probe to the coil.
Resistance without coil: 9kohm
Coil resistance: 3.9ohm
Coil resistance after desoldering (two probes per coil) 0.09ohm

[vannix]

Re: QALA1 LA-7762P What are the coils?

If those coils are for gpu power, 4ohm could be ok, so the problem could be somewhere else.

That notebook (dell e6530, correct?) has dual graphics. Nvidia nvs+intel hd, so you could try uma conversion if you think the problem is the discrete gpu.

[mcplslg123]

Re: QALA1 LA-7762P What are the coils?

Yes, the two removed coils are for gpu power and resistance of 4 Ohms may be ok.