TPS62180 Alternative?

hambook

Member
Hi all, I have an 820-01598 that came in no power, 5v 0.01a. Missing PP3V3_G3H_RTC and the area around U6903 and the chip itself are gross. Only problem is, I don't have a donor and Mouser + DigiKey are both out of stock. Suppose I could order from Aliexpress but the closer the better. Any other ideas where to pick some of these up, or any other compatible chips that would work in it's spot?
 

hambook

Member
Have an update on this one. Got the chips in and replaced U6903, rebuilt the area around it from a donor as most of the components were nasty. USB meter now shows 5V 0.05-0.06A. Nothing on the chip has a diode reading under 400 so nothing seems shorted, but PP3V3_G3H_RTC goes up to 3v and then drops down and cycles over and over. PPBUS does the same. What other rails could be shorted in this case? Other than this one spot the board is clear of liquid damage.

Diode:
PPBUS_G3H: 442
PP3V3_G3H_RTC: 405
PP3V3_G3H: 544
 
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hambook

Member
Getting 1.3ohms resistance/001 diode on PP1V8_SLPS2R. Does this signal originate from the T2 on this board?
 

2informaticos

Administrator
Staff member
You should get steady PPBUS_G3H, even with only 5V on USB-C input.
Check what happens if a good battery (holding some charge) is connected.

If you remove R6934/35, PPBUS_G3H still drops?
 

hambook

Member
With R6934/35 off, PPBUS is stable 12.29v. Will have to do some more investigating in the U6903 area.
 
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