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

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

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  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.
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#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
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