I reversed polarity on a LED Flashlight and blew an 8-pin SMD chip with no datasheet or markings that anyone on the planet recognizes.

Thread Starter

xMidNight

Joined Aug 3, 2025
1
Quick story, This is an powerful LED flashlight used for dental photography, A R040 SMD resistor was bad I couldn't find any replacement locally so for testing I used a "000" resistor basically a jumper, And stupidly I reversed the battery polarity which went straight for this chip because the resistor was useless, Now this is my first ever repair and first time ever touching a multimeter anyway so these rookie mistakes are expected i hope you won't judge me :D

The chip is "33LA G1 A3JD" its no where to be found, Some fellows on reddit found these original SC3633 SOP8 PWM boost LED constant current driver IC SC3633 silk screen: 33LA

zgsemi Boost LED driver
I'm hoping for some advice on how to take it from here, I also asked ChatGPT for some assistance to identify this chip and did some probing and heres the result:

  • Pin 1 (dot corner) connects to R9 & R10
  • Pins 2 & 4 connect to coil + battery +
  • Pin 3 connects to battery positive
  • Pins 5 & 6 connect to GND (R25)
  • Pins 7 connect to R19 & R21 ... R19 = "563" , R21 = "304"
    and I can't seem to find anything that beeps to those resistors other than PIN #7

    Please assume that PIN 1 Is the one with the DOT on it, I noticed that this particular chip is rotated not like the other chips right next to it.

    I am ready to do any probing

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