Hints on how to proceed - Aspire 7 - A715-72G-739V doesn't boot

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Answers

  • JackE
    JackE ACE Posts: 45,202 Trailblazer
    Yeah, some presumably identical mainboards had the safety switch, some didn't. Production changes can happen like this without notice --- maybe when they run out of parts and just solder the switch contact mounts on the mainboard. I'm not sure if we checked the battery out yet.  Should read just over 15volts, usually between the ends of the connector. This link has new ones for less than $45 https://www.laptopbatterydirect.net/acer/acer-aspire-7-a715-72g-battery.htm
    Might be worth a shot before trying more drastic risky attempts to salvage the mainboard.  Jack E/NJ


    Jack E/NJ

  • northland
    northland Member Posts: 30

    Tinkerer


    Am uncertain how to go about checking battery voltage.    The motherboard connector is a hardwired multiple connector component with no access that I can see to check voltage.   The battery itself is sealed in a vinyl cover and I was reluctant to 'dig into it'.  See attached photos.

    Also, as per instruction you shared on the 11th ("leave the pack disconnected to eliminate it as a possible cause or contributor") the battery pack has never been connected since then anyway so am not clear on what this proves at this time.    What am I missing?

  • northland
    northland Member Posts: 30

    Tinkerer

    Oops - photos here
  • northland
    northland Member Posts: 30

    Tinkerer


    JackE

    First of all I want to sincerely thank you for all the time and effort you put in to helping me with this problem.   The depth and breadth of your knowledge is astonishing and the commitment of time you made to helping me alone (never mind the other 20,000+ messages you have contributed to the forum) is amazing.

    Secondly, not having heard anything further from you, just wanted to confirm that the conclusion is that I now own a 'brick' and just need to move on.

    Finally, as I own another identical machine (my primary laptop) just wanted to touch base to determine if there was a history of such failures with this model that I ought to be alert to?
  • JackE
    JackE ACE Posts: 45,202 Trailblazer
    Sorry. I somehow missed your April 13th messages.  I also wasn't sure if we had left the battery disconnected. But what we wanted to check was the battery's voltage output usually between the two extreme ends of its mainboard connector---deep red/pink and black wires. Needles might have to be used to access the contacts inside the connector. Then use a multimeter to check the output between the two needles. Should be 15+ volts. Jack E/NJ

    Jack E/NJ

  • northland
    northland Member Posts: 30

    Tinkerer

    Battery voltage is good.
  • JackE
    JackE ACE Posts: 45,202 Trailblazer
    >>>- Power on with battery alone- KB flashesThen follows a repetitive sequence of events:  power light goes out after 1 to 2 seconds
    - power light comes back on / keyboard flashes- .... and repeat>>>

    OK. Somehow this seems to be acting more like corrupt BIOS firmware or a BIOS chip hardware failure. I fear the latter since you indicated earlier that no attempt was made to change the firmware.

    Accordingly, I suggest we first try to flash the BIOS using the FN+ESC cold boot method. To do this, you must first download and unzip the latest BIOS firmware v1.26 on another machine from this link https://www.acer.com/ac/en/US/content/support-product/7627?b=1.

    Then run the unzipped executable EXE. It should yield yet another folder with more files. What you're looking for is a file with an FD, BIN, ROM or WPD extension about 17MB is size. It must be renamed DH53FX64.FD. The renamed file should then be copied to the root directory of a FAT32 formatted  USB pendrive with an activity LED. It must be the only file on the FAT32 pendrive root directory.

    Then with the a715 turned completely off, insert the pendrive with the DH53FX64.FD file, Then insert the charger. Then press & hold the FN+ESC keys. Then, while still holding the FN+ESC keys, press the power button to turn the machine back on. Don't let go of the FN+ESC keys till you see pendrive LED actiivity.

    If successful, the activity LED should continue for about 5 minutes. Then the computer should automatically shut off. Then, with your fingers crossed, you should try to turn it back on to see if anything good happens. Jack E/NJ






    Jack E/NJ

  • northland
    northland Member Posts: 30

    Tinkerer

    Good morning
    When I get to this step of provided instruction "run the unzipped executable EXE. It should yield yet another folder with more files", launching the executable actually launches (after MS warning) a utility application identified as INSYDE which is apparently seeking to apply the latest firmware.   As I was getting this material together on an old laptop, the utility failed to find relevant hardware and reported error "Get flash part information error".

  • JackE
    JackE ACE Posts: 45,202 Trailblazer
    Did the  downloaded zip file only yield an EXE file?  Or are there others? Jack E/NJ

    Jack E/NJ

  • northland
    northland Member Posts: 30

    Tinkerer

    Just the EXE and a readme.txt containing the following:

    How to update the BIOS:
    Click "DH53F126.exe" under Winodows mode

    Release Note:
    1. Fix F9 load default then save & shutdown will power on issue.

  • JackE
    JackE ACE Posts: 45,202 Trailblazer
    OK. Let's try the EXE anyway. Is should also be about 17MB.  Rename it to DH53F126.FD and put that on the USB stick with an activity LED. Then try the FN+ESC method. If no joy, then try renaming it to DH53FX64.FD. Jack E/NJ

    Jack E/NJ

  • northland
    northland Member Posts: 30

    Tinkerer

    .EXE file is about 12.5MB

    In spite of that, tried it as instructed - each file name in turn.    In each instance, watched the stick activity light closely and it never came on.   It is my perception that in spite of the power on key press (FN + ESC) that the chassis is not reacting to the key sequence or accessing the stick at all.    Goes immediately into the now familiar flashing back light.
  • JackE
    JackE ACE Posts: 45,202 Trailblazer
    Yeah. Seems like either dead BIOS chip or bricked. If bricked, I think ACER repair service charges around $100 to re-program the chip out of warranty. If a dead chip, probably not worth the cost of fixing or a replacement mainboard. A $100 gamble plus shipping. Sorry. Jack E/NJ

    Jack E/NJ

  • northland
    northland Member Posts: 30

    Tinkerer


    While the outcome is not what I had hoped for, I want to again offer my sincere thanks for all your time and effort walking me through these various diagnostic steps.

    All the best to you.