150-watt load tester USB voltage display wrong - how to fix?

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d_t_a
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150-watt load tester USB voltage display wrong - how to fix?

After looking at Dodge Reviews youtube video, I saw the 150-watt load tester, and ordered one (it was less expensive in the ATorch AliExpress store than in BG, so I got it from there).

 

Upon receiving the unit, I immediately tested it (I was planning to use this for testing batteries at higher currents (the EBD-USB+ can only test up to about 3-4 amps and would require USB to alligator clip which introduces resistance, plus the USB cable would likely not be able to transport higher current, eg. 10 amps at nominal lithium-ion voltage 3.7v)

 

On testing, I initially only tested USB devices, and using the USB A, micro-USB, USB-type C ports, the voltage readings are always too high (real 5.0v will display "8.0v"; real 3.9v will display "6.1v")

Only later when I tried using the wire-terminal, did I notice it displays correct voltage (within some tolerance).

 

Initially I though of calibrating the unit (which seems to require an accurate 30v power supply, but I don't have one, so I just did a factory reset of the load tester.  Which resulted in the same wrong displays (when using any of the USB outputs).  What do you think could be at fault and can it be fixed somehow?

 

 

 

 

 

 

 

 

 

 

 

Edited by: d_t_a on 07/25/2018 - 00:57
d_t_a
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I’ve gotten in touch with ATorch where I obtained this 150-watt load tester.

They analyzed the photos and video I sent them, and they asked me to try to short-circuit the 2 wire-terminals.

Lo and behold, when I short the 2 wire terminals, the voltage screen display will now be correct (well, within some tolerance).

But that seems to be a temporary fix. I wonder if other people also need this “fix” for their USB voltages to show correctly? And also if there is a more permanent fix?

d_t_a
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Update:

ATorch replied to me and mentioned that the fix is to change the diode.. posting it here in case someone else has encountered this issue, will find this as a reference.

(I still haven’t changed mine… waiting for them to send the replacement part)

angerdan
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What purpose do you recommend this 150W load tester for?