Dash cam repair/component ID request

[RobertHolcombe]

Hey,

Generic brand dash cam was fed with vehicle ACC+ instead of 5V into the USB mini-B socket

SOT-23-6 "LPS 8W8" released the magic smoke - I can't find anything on google as to what it is



Appreciate any help

[RobertHolcombe]

Assuming the silkscreen mark is for pin 1,

pin 1 gnd
pin 2 gnd
pin 3 vin
pin 4 trace leads to unpopulated footprint to the right of this package
pin 5 gnd
pin 6 gnd

Going to try substituting a diode if I can find one to salvage

[DaJMasta]

Don't know if this is a lead, but you can buy similarly marked parts, at least:
https://www.aliexpress.com/item/LPS-SOT23-6-SOT363-100-NEW-ORIGINAL/32825111244.html

Seems like a lot of pins for a diode, but maybe, it does seem like some searches show up with that.  Could be a LDO as well.  Any others on the board?  Could be a lead with how it's used there.

[RobertHolcombe]

No others on the board, definitely looks like the same part and makes sense to be a vreg, was really hoping it was input protection but what can I expect from something mass produced

Will have a play with my psu feeding pin 4 to see if there's any sign of life

Thanks for the link

[fzabkar]

https://item.taobao.com/item.htm?id=582236311639

The text translates to "Screen printing LPS 8W5S3 8W6S3 8W6S0 8W7F1 SOT23-6 overvoltage protection IC chip".

I would remove the IC and install a regular TVS diode in the unpopulated spot next to it (assuming pin #4 is grounded).

LP5300B6F, LowPowerSemi, Overvoltage (6.1V) & overcurrent (2.1A) protection IC, 3V - 36V in, marking 8Wywx, SOT23-6:
http://www.lowpowersemi.com/uploads/soft/20170926/LP5300.pdf

[RobertHolcombe]

Seems like the one, thanks a bunch

[fzabkar]

If the dashcam were mine, I would remove the IC and install a TVS diode between pin #4 and ground, and then install a polyfuse in the unpopulated location adjacent to the IC.

[RobertHolcombe]

I bodged in a 500mA polyfuse, confirmed it still works

Will try and find a small enough TVS to salvage, the board has an LCD sitting directly on top of it so its a bit tight in there