Hello

I need the [B]boardview[/B] for an [B]Asus EeePC 701[/B]. Board is labelled [B]P701[/B].

I have the schematic but components are not labelled on the board and it is very difficult to follow up the circuitry.

ThanksHello

I need the [B]boardview[/B] for an [B]Asus EeePC 701[/B]. Board is labelled [B]P701[/B].

I have the schematic but components are not labelled on the board and it is very difficult to follow up the circuitry.

ThanksHello

I need the [B]boardview[/B] for an [B]Asus EeePC 701[/B]. Board

Hello

I need the schematic and/or boardview of an [B]ASUS all-in-one model V220IB[/B]. The board in it has the same model number, V220IB.

Searching for it in google returned no results, so I looked for similar models and I found [B]V200IB[/B] with boardview available, but unfortunately only in pay sites.

I will be very grateful if anyone can share with me this schematic.Hello

I need the schematic and/or boardview of an [B]ASUS all-in-one model V220IB[/B]. The board in it has the same model number, V220IB.

Searching for

Re: LA-6901P no display, cpu_core 0.5v and vgfx_core 0v


Today I have tried removing the resistor (PR251) between the driver chip (ISL95831, PU12) and phase 1 high side mosfet (PQ61). After doing this, I still have a 40 ohm resistance between driver output to ground, but a high resistance between PQ61 gate and ground. This means that the ISL driver chip is gone?...

Re: LA-6901P no display, cpu_core 0.5v and vgfx_core 0v

Hello

Thinking about the problem I have another hypothesis. The CPU VRM has two phases, and the GFX core one. Measuring the resistance between the high side mosfet gate of each phase to ground I obtain these values:
- CPU phase 1: 40 ohm
- CPU phase 2: 1.1k
- GFX unique phase: 1.1K

Maybe phase 1 is not working properly and hence I have an vcore of 0.5v, just a half of what it should be? But in this case, the feedback circuitry should not detect the voltage mismatch and reach the correct...

Re: LA-6901P no display, cpu_core 0.5v and vgfx_core 0v



Replacing the IC surely is the best option, but as it takes too long to arrive from china and this IC seems to have few feedback pins, I decided to try first without it.

The IC is an ISL6251AHAZ. By reading the datasheet and looking at the board schematic I interpret that it is active only during ac adapter operation, and running the laptop from a already charged battery does not change the laptop behavior. So I doubt this is the problem....

Hello

I was trying to fix a laptop with LA-6901P board (schematic available in many sites). It was totally dead and found a problem with the battery charging circuitry. Bypassed it and now it powers on from the ac adapter, power led stays lit, fan spins a few seconds but shows no image. It does the same powering it from a already charged battery

I started checking voltage rails and found all correct except cpu_core, which was at about 0.480v, too low for me, and vgfx_core, which remained at 0v. Removing the ram makes no difference, and removing the cpu makes vcore...

Re: New Members - please post your introductions here

Hello

My name is teknosrp and I arrived long ago to this forum searching for laptop schematics. Now I need help as I can't find myself the problem of a LA-6901P board with low vcore, and to open a new thread I have to post a message first. So here I go.

Many thanks to the forum maintainers and all who participate.