After several reports from users about problems with their dodocool 30W USB Type-C PD Charger, one user was kind enough to send us his dodocool charger that had stopped charging.
The dodocool 30W USB Type-C PD Charger supports 15 watts (5 volts @ 3amps), 27 watts (9 volts @ 3 amps), and 30 watts (20 volts @ 1.5 amps) power profiles.
To see what was going on, we connected the non-functioning dodocool 30W USB Type-C PD Charger to the Apple MacBook (Early 2015) and used software from Granite River Labs to capture the USB Power Delivery Protocol transactions.
Compared to the communication below between the same Apple MacBook (Early 2015) and its 29W USB-C Power Adapter, we can see there may be some issues with the dodocool 30W USB Type-C PD Charger's communication bit rate is a lot lower than what the Apple 29W USB-C Power Adapter is using to successfully communicate to the same Mac.
It's not clear yet why the USB Power Delivery controller in the dodocool 30W USB Type-C PD Charger would start having this problem or if whether this issue is causing the charging failure that other users are seeing. There also might be variations somehow between different units of the dodocool 30W USB Type-C PD Charger that cause different USB Power Delivery behavior. If others have problems with their dodocool 30W USB Type-C PD Charger, we'd like to hear about it (contact us here) so we can feed this back to dodocool.