I'm trying to diagnose a faulty builder's worklight.
It has a single board, a 8.4V battery, an external 8.4V DC input, and a LED Panel.
What voltage would you expect at the LED panel?
I'm measuring 8.2V supplied to the LED panel, when powered by battery to 8.4V when the DC-mains lead is connected. An 8.4V test LED borrowed from a bike light works fine, but the LED panel pictured does not illuminate.
The LED panel physically has 6 rows of 6 LEDs, but trying to look at the traces suggests its 4 rows of 9 LEDs but "folded up"
I don't have any test PSU capable of doing more than about 19V, and the LED panel does not illuminate at 8.4V.
Which is likely faulty - the LED panel or the driver board?