Need help in identifying component of Baofeng DM 860

G4EML
Posts: 919
Joined: Sat Nov 16, 2019 10:01 am

Re: Need help in identifying component of Baofeng DM 860

Post by G4EML » Thu Aug 05, 2021 12:45 pm

That’s the PA stage not the driver. However I suspect it may work OK in either position.

Ik7vxc
Posts: 11
Joined: Sun Jan 24, 2021 7:44 pm

Re: Need help in identifying component of Baofeng DM 860

Post by Ik7vxc » Thu Aug 05, 2021 12:53 pm

Colin, are you saying that the picture posted by LY1RF is misleading?

LY1RF
Posts: 43
Joined: Sun Mar 01, 2020 12:05 pm

Re: Need help in identifying component of Baofeng DM 860

Post by LY1RF » Thu Aug 05, 2021 2:04 pm

you've ordered transistor of last stage of power amp, but in your photo it's looks ok, driver of that last stage transistor is faulty.

G4EML
Posts: 919
Joined: Sat Nov 16, 2019 10:01 am

Re: Need help in identifying component of Baofeng DM 860

Post by G4EML » Thu Aug 05, 2021 6:10 pm

The layout of your board is slightly different to the GD77 shown on Jason’s page. The layout is similar but the mounting holes are in different places.

On your board the device on the right is the PA which looks undamaged. The device that is burnt is the driver stage. However they are both MOSFETs so fitting a higher power device as the driver may work OK.

Colin.

Ik7vxc
Posts: 11
Joined: Sun Jan 24, 2021 7:44 pm

Re: Need help in identifying component of Baofeng DM 860

Post by Ik7vxc » Thu Aug 05, 2021 7:36 pm

Actually when comparing both circuit boards they are clearly not the same device.

https://ibb.co/4t6Rpb8

Mike IK7VXC

G4EML
Posts: 919
Joined: Sat Nov 16, 2019 10:01 am

Re: Need help in identifying component of Baofeng DM 860

Post by G4EML » Thu Aug 05, 2021 10:15 pm

Even different batches of the same radio have different devices so you can’t really go by appearance. The manufacturers change devices all the time.

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