teknosrp
New Member
Last Activity: 09-29-2024, 03:27 AM
Joined: 11-24-2018
Location: netherlands
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This is only the schematic, not the boardview.... -
Vestel 17MB140TC boardview
Hi
I'm looking for the boardview of the board stated in the title. I have the schematic, but most components are not labeled on the board silkscreen. For other Vestel boards, I could find it.
Thanks! -
EeePC 701 boardview needed
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 -
Schematic and/or boardview needed for ASUS V200IB or V220IB
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?...Leave a comment:
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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...Leave a comment:
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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....Leave a comment:
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LA-6901P no display, cpu_core 0.5v and vgfx_core 0v
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.Leave a comment:
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