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/diy/ - Do It Yourself

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1967071 No.1967071 [Reply] [Original]

What the fuck is this and why it doesn't lit except if I probe the led directly with multimeter in diode mode?

>> No.1967273

>>1967071
The 3 pin chip on the board is a transistor, so that connector probably has 2 pins for power and 1 to activate the transistor and therefore the lights. Use your multimeter's continuity mode to find out which is which

>> No.1967372

>>1967273
which transistor is it? I tried searching for the smd marking and found nothing. What's the part number?

>> No.1967705

>>1967372
Probably a MOSFET. Could also be a generic 3 pin LED controller. The part numbers on these small SMD parts are notoriously hard to look up

>> No.1967708

>>1967705
WH6
53

visible on the photo.

>> No.1967833

>>1967071
>those shitty cold solder joints
Is that OP's work or quality chinese manufacturing?

>> No.1967862

>>1967833
Quality Chinese manufacturing, since I haven't even touched a hot soldering iron to the the board

>> No.1967974

>>1967862
why are you touching anything with a cold soldering iron?
That’s just boring.

>> No.1968020

>>1967273
Try bypassing the chip, run those LEDs with courage!

>> No.1968350

>>1968020
what smd chip is those wtf

>> No.1968363
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1968363

>>1968350
I am pretty sure this is some kinda night light or sensor. There is two capacitors and a resistor implying some smoothing and voltage adjustment. There is then two LEDs and what seems to be a light detector. That smd is probably a transistor that turns on when the sensor generates a voltage. Or it is a detector that sends a signal down pin 3 when the sensor picks up an increase in light intensity when something moves in front of the IR LEDs or something.

>> No.1968366

>>1968363
it's a car's light. so not a sensor.
what part number is the three pin smd part?
writing is WH6 53

>> No.1968465

>>1967071
Is the lowest component a buggered LED?
If so, the series chain would be broken.

>> No.1968509

>>1968465
The LEDs (all three of them) lit on diode mode on a multimeter, so highly not.

>> No.1968808

>>1967071
diode mode likely passes the most voltage through the leads out of all the other settings and because it's diode mode your multimeter is passing enough voltage to reach the forward voltage of the LEDiode

>> No.1968845

>>1967071
The solder job on the connector is utter shite, reflow with plenty of flux.

>> No.1969565

>>1968808
so, what's the three-pin smd SO-23 (?) part?

>> No.1969676

>>1969565
It is a transistor. Use a multi meter and lab power supply to determine activation voltage.

>> No.1970127

>>1969676
what part number?

>> No.1970311

>>1970127
Cant you desolder the transistor and test it with multimeter? Maybe just use a generic transistor lr short it to test if the rest of the circuit works.

>> No.1970314

>>1970311
Or short it to test if rest of circuit works*

>> No.1970317

>>1970311
>>1970314
I don't really have an adjustable lab power supply though. Workbench is not mine to begin with.