Can't boot Lattepanda V1 (red LED on)

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    - Have you tried a hard reset?
    - Are you using a 5V@2A+ power supply and a high quality USB cable?
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    Post Reply
    User avatar
    Tolsi
    Posts: 29
    Joined: Tue Apr 26, 2016 10:21 am

    Thu Jun 18, 2020 7:23 pm

    Hi.

    I bought Lattepanda V1 4/64 for a long time, threw it in a box, now I decided to get it and everything broke :<

    I booted up Windows and used it for about 5 minutes (with a 7 "screen) and then it went out and now does not want to boot anymore. When the power is connected, the red light turns on and remains on, the blue one blinks and stops.

    If I press the power button, nothing happens neither through HDMI nor through the 7" screen. The connected keyboard does not respond. No lights (num lock and etc) on it light up.

    Then I tried to change a power supply to Apple’s 20W, I have a tester and it gives out a 5V 2A board. Nothing changed.

    Seeing similar problems on the forum, I flashed the BIOS "DF-BI-7-S70CR110-C45B-001-B" through the programmer, it did not help. I also tried pressing the “hard reset” combinations (two close white side buttons like power and reset?) 10 times and it doesn’t seem like something was different from just turning it on and it didn’t help. :roll:

    Any help?

    User avatar
    LattePanda
    Site Admin
    Posts: 2642
    Joined: Wed Jan 20, 2016 9:09 am

    Fri Jun 19, 2020 2:44 am

    Hi Tolsi,

    Can you send us a picture of your display connection? Did you flash BIOS successfully?
    Enjoy Tinkering with LattePanda ! :lol:

    User avatar
    Tolsi
    Posts: 29
    Joined: Tue Apr 26, 2016 10:21 am

    Fri Jun 19, 2020 4:30 am

    > Can you send us a picture of your display connection?

    There is nothing special to show here. I used a 3D printed frame for the screen and the board was fixed at the back. Now I'm just testing it from HDMI to my TV

    > Did you flash BIOS successfully?

    Yes, it took about two hours to read and write/validate, I used CH341A with a special clothespin for the chip, it was very simple. There are differences between the old and the new BIOS dumps, but they both look similar.

    BTW I used a Windows virtual machine in Mac OS X for firmware and maybe that’s why it took so long. Now I will try to flash "Auto power ON BIOS" on a Windows machine.

    PPS This time it took 5 minutes. Anyway, nothing with HDMI and LCD. The red light is on all the time (even when I was flashing the chip), the board heats up and shows no signs of life.

    When powered by microusb, it consumes 5.15v / 2A, and there're only 4.77V on the CN2 connector. Perhaps this is not enough?

    Also, I tried to power it using CN2 port (like http://www.lattepanda.com/topic-f10t797.html), at first it seems as if the board is initializing (the red LED is on, the blue LED flickers smoothly), then the red and blue LEDs starts abruptly as if it is a short circuit, but I am sure that the contact is correct. Maybe I have a bad voltage regulator, it works from USB, does not give out enough current and sags under load.
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    User avatar
    Tolsi
    Posts: 29
    Joined: Tue Apr 26, 2016 10:21 am

    Mon Jun 29, 2020 7:39 am

    Any ideas?

    User avatar
    LattePanda
    Site Admin
    Posts: 2642
    Joined: Wed Jan 20, 2016 9:09 am

    Tue Jun 30, 2020 6:53 am

    Hi Tolsi, it seems like some circuit issue. pls contact techsupport@lattepanda.com for repair.
    Enjoy Tinkering with LattePanda ! :lol:

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