New BAOFENG DM-1701 defective !

[oe7abh]

Hello,

We have a new Baofeng DM-1701 from China here at the club, which was unfortunately delivered defective. It always triggers a settings reset when you operate the GD77 menu! See the video!
Even with the original firmware (as delivered), a reset was repeatedly triggered.

What can be done about this?
Thank you very much!

http://tyrofly.at/forum/Baofeng_DM-1701_defekt.MP4

73 Alfred OE7ABH

[F1RMB]

Hi,

Well, you could check the SPI lines. Also, maybe the SPI flash is defective (you can replace it).
In this case, you will also probably need to use the CPS to flash a calibration block from another 1701.



Cheers.
---
Daniel

[oe7abh]

Thank you Daniel for your quick reply!

Unfortunately the USB programming cable keeps getting interrupted.
Flashing back the calibration from another 1701 is therefore not possible!
How can I replace the SPI flash?
Daniel, can you give us clear instructions for the repair?

73 Alfred

[VK3KYY]

The problem could be in several places

1. Dry joint on the STM32 MCU chip
2. Dry joint on the SPI Flash chip
3. Defective SPI Flash chip


I recommend that you open the radio and find the Winbond Flash chip, and carefully try to resolder the legs.
The Flash chip is an 8 pin surface mount device, that will be near the MCU chip

Attempting to resolder the MCU connections to the Flash chip is much more difficult and risky, so focus on the Flash chip

[oe7abh]

Thanks Roger, we'll try to fix it!

73 Alfred OE7ABH

[oe7abh]

Hi Roger,

the 8-pin We resoldered the flash chip! Unfortunately, errors still exist.
We cannot restore the "Flash" - the USB port is immediately closed.
Should we use the 8-pole? Replace flash chip?

The code plug can be written into the device, but then the USB port is permanently on/off.

73 Alfred

The problem could be in several places

1. Dry joint on the STM32 MCU chip
2. Dry joint on the SPI Flash chip
3. Defective SPI Flash chip

I recommend that you open the radio and find the Winbond Flash chip, and carefully try to resolder the legs.
The Flash chip is an 8 pin surface mount device, that will be near the MCU chip

Attempting to resolder the MCU connections to the Flash chip is much more difficult and risky, so focus on the Flash chip

[VK3KYY]

Hi Roger,

the 8-pin We resoldered the flash chip! Unfortunately, errors still exist.
We cannot restore the "Flash" - the USB port is immediately closed.
Should we use the 8-pole? Replace flash chip?

The code plug can be written into the device, but then the USB port is permanently on/off.

73 Alfred

The problem could be in several places

1. Dry joint on the STM32 MCU chip
2. Dry joint on the SPI Flash chip
3. Defective SPI Flash chip

I recommend that you open the radio and find the Winbond Flash chip, and carefully try to resolder the legs.
The Flash chip is an 8 pin surface mount device, that will be near the MCU chip

Attempting to resolder the MCU connections to the Flash chip is much more difficult and risky, so focus on the Flash chip

Its impossible to know whether the problem is the connection to the Flash chip e.g. at the MCU end of the PCB traces or if the chip is defective
You could probably try to resolder the Flash pins.

I checked the MCU connections to the Flash chip and its on port SPI 1 , which uses Pins PB3,PB4 and PB5 with chip select on pin PD7

So you could check all those pins for connectivity to the Flash chip.

If all those pins seem to be connected, then possibly the Flash chip is defective and will need to be replaced.

I do not know whether the USB problems are because of the problem with the Flash or whether all the pins on the MCU do not have good connections, i.e including the USB pins