Frsky Q7 wont power up after plugging micro USB ...

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acidjunkie1980
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Frsky Q7 wont power up after plugging micro USB ...

Post by acidjunkie1980 » Fri Aug 09, 2019 10:25 am

hello people....
last night i tried to connect the q7 to the pc to play sim...when it was normaly on i just plugged the usb and the radio went off and now it dont power up at all...when i press the button the speaker does a sound only ...it dont go to the bootload menu either....i found on internet many people with the same prob....most of them solve it by reflashing the firmware...but mine is not recognised by PC even i installed the newest drivers for win10...when i plug the usb again it makes only a speaker sound...i tried to leave it alone and change batteries...nothing of these works...and i just went and got a new usb cable i thought maybe was the cables fault but again the same...i tried companion and dfuse ....but the prob is that its not recognised by pc...please any ideas? i talked to frsky and showed them the problem they said its firmware for sure...cause if something was tosted it wouldnt do that noise when pressing button and plugging the usb....pfff...if anyone can email me at [email protected] would be much apreciated..i will check here too....
thanks anyone who will try to give solution :!: :idea:


acidjunkie1980
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by acidjunkie1980 » Fri Aug 09, 2019 6:42 pm

fixed..sorry for the incovinience caused.

EoRmEo
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by EoRmEo » Sun Aug 18, 2019 12:11 am

How did you fix it? I’ve tried flashing it with opentx companion...I’ve tried using Zadig...I’ve tried dfuse....but not really sure how to use dfuse....pls help meeee 😭

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jhsa
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by jhsa » Sun Aug 18, 2019 12:35 pm

Guys, I have a QX7 from a friend of mine here at home with the same problem. last thing he did with the radio was playing simulator on the PC. Indeed, it seems that this already happened to loads of people.
I opened the radio and I measured a 16 Ohm short on the 3.3V rail which is what powers the processor. When I press the power button, the 3.3V are there, but the processor gets way to hot to the touch in about 5 seconds.
While measuring the voltages the radio suddenly did turn on a couple times. at first the Backlight was flickering, but then it was steady. Then it just died again. This is definitely NOT a software problem in my opinion. To me this sounds like a BAD DESIGN. I think we will read more about this problem in the near future. I believe (but could be wrong), that something is damaging the processor, specially when using the USB..

João
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Kilrah
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by Kilrah » Sun Aug 18, 2019 5:50 pm

Was he using a hub? Only think I could see is a hub or faulty device supplying incorrect voltage or feeding DC into the data lines. The input circuitry is just fine.


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jhsa
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by jhsa » Sun Aug 18, 2019 9:35 pm

I have been searching the net about people having the same problem, and I have found a few. it would be a big coincidence all of them having a hub with incorrect voltage.. And even if that was the case, the 3.3V regulator would take care of that, or it would get damaged. The voltage coming out of it is spot on, so no, I don't thing that the problem is external.. I would love to have a look at the schematic of this radio. well, me and a few thousand more i guess :) :mrgreen:

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Kilrah
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by Kilrah » Sun Aug 18, 2019 9:45 pm

That's why I mentioned "or the data lines". These need to go straight to the cpu.

Did your other reports ascertain a hardware problem?

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jhsa
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by jhsa » Sun Aug 18, 2019 10:01 pm

well the symptoms are the same. after playing sim the radio didn't turn on anymore, and the speaker only clicks once when pressing the power button. This is what I found in common. And you only have to read the other reports above.
On RCG I found other reports as I was doing some research to find out if someone found a solution.. Apparently, it looks like the solution is to buy a new motherboard, that costs nearly as much as a new radio :(

as I said, I would like to see the schematic. I wonder if this radio has zener diodes on the data lines. They should protect against any voltage spike that could damage the CPU..

João
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jhsa
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by jhsa » Sun Aug 18, 2019 10:04 pm

Just found one more report on RCG. Exactly the same.. Coincidence?? ;)

"QX7S dead
So after some simulation practice last week I pulled my USB connector today for flying on the field. Before I went out I would change model in the radios menu.
When pressing the switch it wouldn't turn on just the clicking sound from the speaker.
All I used is Frsky moduls on this radio, no burnt part on the PCB but the soldering on connectors do not look great so I will try to resolder them.
It has been in service for almost a year."
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Kilrah
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by Kilrah » Sun Aug 18, 2019 10:05 pm

Just the same person posting in multiple places?

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jhsa
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by jhsa » Sun Aug 18, 2019 10:14 pm

well, at least the user names are different. Here above, counting with myself, we are 2 or 3
then the one I copied the test above on this link..
https://www.rcgroups.com/forums/showpos ... stcount=28

and some other that I am not going to bother finding links as i have better things to do :) :mrgreen:
It doesn't look like any of us is posting on different places.. :)
I even seen this problem quite often here on our forum quite a few times. I read nearly everything here.
So, no, this is not a PC problem, and it is not coincidence :) This looks like a mess up to me :)

João
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by EoRmEo » Mon Aug 19, 2019 9:49 am

Sigh got the same problem....tried flashing with opentx companion....tried using Zadig....been trying to figure out Dfuse but computer doesn’t see DFU device....etc etc...


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jhsa
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by jhsa » Mon Aug 19, 2019 9:54 am

Does your radio's speaker also click when you press the power button?
Connect the USB and press the button, does the STM Bootloader appear on screen?
When you put your finger on top of the processor, then press the power button. Does the processor get too hot to touch after 5 to 10 seconds?

joão
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Re: Frsky Q7 wont power up after plugging micro USB ...

Post by EoRmEo » Sun Aug 25, 2019 11:41 pm

Yes it makes a sound, yes it shows up at STM BOOTLOADER, and yes it gets hot after plugging the usb in....please help me lol


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