I had the unit stored for sometime but when I just tried to power it up from USB it did not start. I also tried using DC with the same result. I bought an assembled unit in 2022 or 2023 but I can't find when.
Thanks for any help.
p.s. As yet I have not opened the case.
Unit won't power up
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OK1ALN
- Posts: 1
- Joined: 20 Mar 2025, 11:11
Re: Unit won't power up
My radio also died recently during an FT8 broadcast and could no longer be turned on. The root-cause was improper/instable antenna connection thus high SWR while transmitting.
I'm not going to give you any sophisticated advice but I would start like this:
I would connect the radio to an external bench power supply or USB power meter and check the radio's power consumption as a first step. In my case the power consumption went into short circuit.
In the next step you can't avoid opening the device. Disconnect the control board and the board with the vf circuits. Repeat again the test with the power supply connected. This will verify which board is at fault. If your LCD power on then the control board is ok and you should look on the rf board. In my case, the power transistor has gone.
To verify this, I desoldered the L15 inductance and reconnected the boards, this isolated the shot-circuited PA transistor and was possible to turn on the radio again. So I have verified that it is defective and can order a replacement piece and replace it.
Do a basic diagnostic and post here where you got to.
I'm not going to give you any sophisticated advice but I would start like this:
I would connect the radio to an external bench power supply or USB power meter and check the radio's power consumption as a first step. In my case the power consumption went into short circuit.
In the next step you can't avoid opening the device. Disconnect the control board and the board with the vf circuits. Repeat again the test with the power supply connected. This will verify which board is at fault. If your LCD power on then the control board is ok and you should look on the rf board. In my case, the power transistor has gone.
To verify this, I desoldered the L15 inductance and reconnected the boards, this isolated the shot-circuited PA transistor and was possible to turn on the radio again. So I have verified that it is defective and can order a replacement piece and replace it.
Do a basic diagnostic and post here where you got to.
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