Re: Acer Aspire 5740g dead (no power - no lights)
I have got the laptop fixed after replaced U72 and re-programmed BIOS (U16).
bliu2002
New Member
Last Activity: 02-23-2013, 10:42 PM
Joined: 11-27-2012
Location: MA
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Re: Acer Aspire 5740g dead (no power - no lights)
I cut the wire between pin 18 and S5_ENABLE, and shorted the pin 17 and 18, so that ENC is 5V also, then got 3.3V and 5V outputs from U72! However, the S5_ENABLE is still low, and none of the LED lit up. Sounds like not only S5_ENABLE is a problem, there are other issues in the rest of the system, any insights? Thanks!Leave a comment:
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Re: Acer Aspire 5740g dead (no power - no lights)
Pin 13 is 5V, pin 8 is 3V, pin 17 is 5V, but pin 18 is 0. Traced S5_ENABLE to Q18, and found 1D05V_VTT is 0. Any idea? Am I on the right track?
Thanks!Leave a comment:
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Re: Acer Aspire 5740g dead (no power - no lights)
Thanks! The schematics were actually the correct ones. I was able to trace down to TPS51123 the power regulator, it got 19V input but no 5/3.3V outputs, can I assume this part is dead? Are there any other possibilities that could cause it not to generate outputs?Leave a comment:
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Re: Acer Aspire 5740g dead (no power - no lights)
My Acer 5740g has the same problem. I measured the DCIN1, it got 19V; but none of the LEDs lit. Thanks xose_mania, I downloaded the schematics, it is helpful, but does not seem to match my motherboard because I could not find the components I was interested in. I have attached the image of the board, could someone verify whether I have the correct schematics? If not, where can I find them? Thanks!...Leave a comment:
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