Hello, could lexel or someone help? I am building M2 Quad and my new 17mm FET driver from Lexel does not work.
I already checked,
leds are okay, no short (multimeter check, different driver)
resoldered wires on MCPCB
resoldered negative wire on driver
checked 7135 chips after I soldered spring, if there is no short (under hand magnifier)
pulled off driver, soldered to single MCPCB with led (led works), I connected a battery using crocodile clamps and wires to positive and ground
no response at all.
Then I checked driver again and found R1 connected to resistor?? besides and grounded. I have also another the same white version, which I haven´t use yet. I compared the resistors and they aren´t grounded. Does it matter and is this the problem?
I got no reading :(, this has to be faulty. May I ask you, could you send me a new one 17mm Bistro HD OTSM (Tail clicky lights) driver together with my Buck driver order?
Yes, R2 was grounded to the ring. So I removed it, wicked off all the solder and found, that the pad of R2 is conected to the ring. There is no way how solve this I guess, look below
Its no problem to make a replacement for a fee that covers shipping parts and the time to make it,
usually cheaper than failure analysis but I try never to scrap a driver that has an error
I test all drivers here befre shipping so I have some that need fix and often points on little design errors (or fab errors because they are not within 6 mil with a layer)
I guess pin 2 is what Lexel uses on that driver? It can certainly vary. It might be best to trace the circuit back to verify it’s pin 2. (I’ve seen drivers where pin 7 is used)
Alternatively, you can scrape the solder mask off the trace by the pad and attach the wire there. The current is super low for the switch.