OpenGD77

Your main problem may be internal PCB damage. The PCB is an 8 layer board with the 12V supply running on one of the internal layers. The place you can see the burning is where the internal layer links to the bottom layer. If it has got hot enough to damage the insulation between layers then it migh...

The burnt area in your picture is not a component, it is a PCB track. This track links the 12V Battery supply (on internal PCB layer 4) to the 'always on' 4V regulator that in turn supplies the 3V3 for the main processor. As this is a multi layer board you may have some internal damage which would ...

There are no board layout / PCB files Someone posted and old schematic a few weeks ago, but apparantly its an old version of the schematic and the newer radios have some changes to the electronics, hence its unknown how correct any part of the old schematic is Thank you Roger. Yes I found the schem...

Ok, thanks for clarifying that.

One photo shows the entire board with a red dot signifying the location of burnt component. The other is a closer view of the failed part.

Hopefully someone can share the board layouts and determine what the toasted component is.

Hello, I'm looking for help with a Westcom DM-880B which is allegedly a rebranded TYT MD-9600/Retevis RT-90. Need a schematic with a board layout diagram. This is a friend's transceiver that stopped functioning so I'm looking into it for him. The fan runs continuously, when connected to power, yet t...

Name here is Tom from Michigan. Been a Ham since 2005 and enjoy the hobby so much I'll probably put a rig in my casket with a ground mounted vertical next to my tombstone hi hi.

73 de N8ZI dit dit