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APX 1500 not turning on with new control head .

Agonzalez34

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Mar 24, 2020
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I have 2 APX 1500s with 02 heads , one is a VHF model and the other is 800mhz. The 800mhz control head buttons were not working therefore I decided to swap heads to see if the problem went away or it followed to the other radio . When I did that both screens lit up with “flash zap bootloader “ then the screens lit up but the buttons continued not to work so I put the heads back to the original radios BUT now the radios won’t power up anymore ….. any suggestions I can fix this issue ?
 

Agonzalez34

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Mar 24, 2020
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Did you leave the heads on when the boot loader appeared? This is normal if the firmware has a mismatch. The head will download the host firmware from the brick, it will then reset. Of course it is possible if the brick has really old firmware and the head new, it may not play nice.
Yes I left the heads on until the bootloader finished . Been trying to update the firmware but unable to cuz the radio won’t turn on . Do I just wait and keep trying ? Or should I unplug the head then re connect it ?
 

Echo4Thirty

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One issue we have run into when swapping O2 heads is to make sure the LCD did not come unplugged from the board. it will be a brown rectangle at the top of the head with the speaker to the left.

The heads will have to upgrade and downgrade respecfively to match the firmware on the brick. This will take quite some time.

I would also remove both heads and check to make sure both ends of the flex are seated properly on the head and the brick. Remove and plug them back in just to be sure.
 

Agonzalez34

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Joined
Mar 24, 2020
Messages
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One issue we have run into when swapping O2 heads is to make sure the LCD did not come unplugged from the board. it will be a brown rectangle at the top of the head with the speaker to the left.

The heads will have to upgrade and downgrade respecfively to match the firmware on the brick. This will take quite some time.

I would also remove both heads and check to make sure both ends of the flex are seated properly on the head and the brick. Remove and plug them back in just to be sure.
I checked all the connections to make sure nothing was loose and everything seems proper . I did order a new flex ribbon cable that connects the brick to the head just in case it got damaged.
How would I be able to upgrade or downgrade the head firmware without being able to turn the radio on ?
 
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