Anyone?

tried it also yesterday, current draw is 0,1A at 1V, nothing is getting hot. do you have an idea?...

I tried injecting voltage without the heatsinks, but there is no visible heat point.

Can a shorted CPU or GPU prevent to start of the motherboard? I thought that if there is no direct short in the main power rail, the motherboard should start anyway, but for example, it can't get out from the S5 state, so no pic, or just fans spinning......

Yes, it is 6,7ohm. I tried to inject there 1V also, but nothing was getting hot, checked with thermal camera.
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Hi,

I'm new in the world of repair, and I have a laptop that does not turn on.

I don't know exactly the past of this laptop, I got it in a non-functional state.


The LDO3 and LDO5 are present, and it provides 3.3 and 5V.

When I started to diagnose the motherboard, the regulator for the LDO3V and LDO5V was quite hot, I checked it with a thermal camera, and the 3V from the DNBSWON was missing, so I replaced the IC Chip from a donor board (the ic chip is from the same type of motherboard)

Now, the regulator is fine, it's not heating,...

Hi, I'm Daniel, and I'm new to the world of repairing motherboards.

I would like to create a table, or more likely a guideline about the voltage rails and their possible resistance rail.

I know that the motherboard design has a very big depend on the rail's resistance, but I would like to know what is the smallest value for a rail that can be acceptable. For example, I heard that some new gaming motherboards can have 0,5 Ohm resistance on the GPU rail, but on an older type, it could be a sign of a shorted GPU rail.

So, I generated a table with AI so I can...

Thank you :*