• Acer Aspire 7740g - dead, no power. Motherboard JV70-CP 09293-1

It is currently 14 May 2025, 10:18

 [SOLVED] Acer Aspire 7740g - dead, no power. Motherboard JV70-CP 09293-1

 Forum rules: Click here to view the forum rules

  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
  2. Topic message should contain: the PCB marking code (required in case of hardware repairs), an extended description of problem, things you have checked/replaced/measured, your conclusions and the question. If you are not able to find the PCB marking code, please read THIS TOPIC. If you still cannot locate the PCB markings, please upload a clean, both-side photos of the mainboard - it is required to remove any films, modules or brackets possibly covering these markings.
  3. Before posting a new topic please read all topics in TRAININGS subforum and make a preliminary diagnostic based on the content of those trainings.
  4. Uploading of any complete schematics, BIOS / firmware files or any other kind of documentation, or linking to 3rd party websites with such files, is STRICTLY PROHIBITED. You can only upload the small portion of documentation or, link to BIOS file on UNVERIFIED BIOS FILES subforum, which simplifies the diagnostics/repair. You are not allowed to upload more then one complete page of instruction/schematic per single topic. The file you upload must not contain any watermarks, "confidential" markings, links or email addresses and cannot be password-protected.
  5. It is only permitted to describe one faulty device per single topic - you should always open a new topic for each subsequent device.
  6. Requesting of the full schematics, BoardView files, BIOS files or any other kind of documentation is NOT ALLOWED in this subforum. If you need to ask for any of these, you should open a new topic in DOCUMENTATION/BIOS REQUEST subforum.

#1 Acer Aspire 7740g - dead, no power. Motherboard JV70-CP 09293-1

by valieromarco • 8 August 2014, 01:55
This notebook has no power no AC led on no charging.
I checked missing 3,3V and 5V on L35 and L36, so I replaced U82 and now both voltages are present.
But AC led is still off.
I measured pin 118 on KBK, no voltages is present.
I checked on KBC pin 93 and no voltage is present, so I checked Q21 on Gate is present 3V ACOK but on Drain 0V.
Q21 was replaced, nothing is changed.
I think KBC must be replaced, but before replacing it I don't know why voltage is not present on pin 93 of KBC.

Re: Acer Aspire 7740g - dead, no power. Motherboard JV70-CP 09293-1

by Google Adsense [BOT] • 8 August 2014, 01:55

#2 Re: Acer Aspire 7740g dead,n motherboard JV70- CP 09293-1 4GC01

by dominik555 • 8 August 2014, 05:12
You didn't mention anything about programming BIOS and KBC. Try it.

#3 Re: Acer Aspire 7740g dead,n motherboard JV70- CP 09293-1 4GC01

by valieromarco • 8 August 2014, 11:07
But do you mean programming U65 and U21?

#4 Re: Acer Aspire 7740g dead,n motherboard JV70- CP 09293-1 4GC01  [SOLVED] 

by dominik555 • 8 August 2014, 11:18
Yes.

#5 Re: Acer Aspire 7740g dead,n motherboard JV70- CP 09293-1 4GC01

by valieromarco • 9 August 2014, 15:42
Solved!!!!
Flashing KBC bios.
Thanks.

Re: Acer Aspire 7740g dead,n motherboard JV70- CP 09293-1 4GC01

by Google Adsense [BOT] • 9 August 2014, 15:42
Similar Topics
  ASUS FX504G motherboard DABKLGMB8D0 Rev: D dead  [SOLVED]
  Acer Aspire 5740g płyta jv50-cp MB nie włącza się  [SOLVED]
Asus A550cc motherboard X550cc rev:2.0 no power
Macbook A2442 motherboard 820-02098 no power on no green light
HP SPECTRE X360 Convertible Model 13-ae019nl motherboard DA0X33MBAF0 rev f. no power
Motherboard Asus UX392FN (ONLY MOTHERBOARD) died

Who is online

Users browsing this forum: No registered users and 4 guests

_______________________________
All rights reserved. Unauthorised copying of this website's content or any of its part is strictly forbidden.
Any trademarks, brand names, products or services published on this website belong to their legal owners, are copyrighted and used for information purposes only.