CPMC B6/B7 USB port issue

[PeterG]

Has anyone tried or had any issues with connecting CPMC B6/B7 unit to charger via the USB port please? - Thanks

 

[leadfarmer]

Has anyone tried or had any issues with connecting CPMC B6/B7 unit to charger via the USB port please? - Thanks

It’s the same as the Aoocci unit, your charger needs to be above 66 watts apparently, otherwise it just restarts over and over

Try using a laptop charger

 

[GordonR]

It is not a power problem, it is a voltage problem, or you have the brightness down, or you are lucky with your charger

So the B6 and B7 on the bench with a usb cable, at least the original from China land, will power up on 5v usb-c. It takes a little bit over an amp.

The problem, at least on the unbranded version from WEUASTE, is that the unit requires more than 5 volts (it will power up, but NOT if set to full brightness ...if you can catch it in time to turn that down, it will stay on)

What I did was make a USP-c cable with a PD Decoy for 9 volts in the smart charger end. The decoy triggers 9 volts, the charger powers up and the unit runs perfect on the bench from usb.

I hope that maybe helps.

EDIT add: It is not the power of the charger, it is the voltage, so you need a smart charger, and a decoy to trigger it to 9 volts. There is no usb PD negotiation built into the units usb port at all ...or turn the brightness down to 30% when on the bike, then on the bench it should stop continuously rebooting

 

[leadfarmer]

It is not a power problem, it is a voltage problem, or you have the brightness down, or you are lucky with your charger

It was the reply i got from Aoocci customer service

 

[PeterG]

Just put the unit on the bike and turned down the brightness to about 24%. I then took the unit off and plugged in my Samsung (bog standard) 5V charger and the unit flashed on and then went off again. However, I tapped the screen and it came on and stayed on. I tried this several times with other (cheap) chargers and cables and it does the same. I also took the USB leaad and tried powering the unit on in the car off one of the USB ports there - it worked!!! It will not however power up on my more powerful charger or my lap top charger - no idea what is going on but thanks everyone for your suggestions, at least I can use it indoors!!

Lesson learned, and no thanks to CPMC who were just plain rude!

 

[GordonR]

No worries

A background in electronics, a usb break out tester, a pd decoy widget (also from china land) and extensive testing at the end of last year was all I offered.

(Dredging up an older one, sorry) but does anyone have either the Aoocci or CMPC 6 inch unit ...or exactly the same unit from elsewhere?

If so, does yours work on a USB charger when it's off the bike?

On bog standard usb2 Type A or Type C charger it takes 5 volt and a max of 1 amp ...but keeps resetting.
...

Could be that the CPMC, Aoocci, and WEAUSTE don't all come out of the same factory in Shenzhen, or they have redesigned the usb port since then.

If anyone has the constant rebooting problem though, it costs nothing to try the brightness at full, and again at 30% or so.

 

[GordonR]

Just put the unit on the bike and turned down the brightness to about 24%. I then took the unit off and plugged in my Samsung (bog standard) 5V charger and the unit flashed on and then went off again. However, I tapped the screen and it came on and stayed on. I tried this several times with other (cheap) chargers and cables and it does the same. I also took the USB leaad and tried powering the unit on in the car off one of the USB ports there - it worked!!! It will not however power up on my more powerful charger or my lap top charger - no idea what is going on but thanks everyone for your suggestions, at least I can use it indoors!!

Lesson learned, and no thanks to CPMC who were just plain rude!

most likely your smart charger is looking for a PD power negotiation from the device and not powering up because there is none. Apple chargers and my big Vention give no volts until the device (or a pd decoy signal) asks for it.

Try the brightness even lower? although my unit stopped rebooting if the brightness was about half way. Tolerances I suppose