A2150 820-01598-A with no power

[hgoncalves]

H,

I have an A2150 820-01598-A with no power that had liquid contacts, and the client has already done an ultra-sound (can't see any corrosion right now).
On the ampmetter only consumes 5V, and on F3000 i get 5V, continually oscillating from 0, to 3 to 5V).

Do you think that it may be the CD3127? As i don't have any, should i re-flow it, or should i check anything else?

 

[2informaticos]

Do you get steady 5V at F3000/1?
What about PPBUS_G3H and 3V3_G3H?

 

[hgoncalves]

Hi,
No i don't. On F3000/1 i get oscillating 5V ~0V.
On PPBUS_G3H i get oscillating 12V ~3V
On 3V3_G3H i get oscillating 0.0V to 0.2V

On first post i said the it consumes 5A but i meant that it puls only 5V and consumes 0,2A. Sorry...

 

[2informaticos]

All USB-C ports with the same behavior?

 

[hgoncalves]

Yes, it only has 2 ports, and its the same on both.

 

[2informaticos]

In such case, USB-C area should be good.
Power cycles when the board tries to switch to 20V on USB-C input.
Something is bad on the secondary power supplies.

3V3_G3H should be present even when you have only 5V at input.
Start there; diode mode?

 

[hgoncalves]

3V3_G3H shorted. diodo mode = 0.0003V. I 'll try to inject power and ee if anything gets hot.

 

[hgoncalves]

I've injected 3.3V on 3V3_G3H , got an consume of 0.227A, and the only thing that gets hot is the U7800. Do you know if i can take it from an 820-00281-A board?

 

[2informaticos]

Totally different chip.
Compare schematics...

 

[hgoncalves]

I already suppose that it couldn't. Just to make sure with the expert
I can't find it anywhre. Not even in China. Do you know if it is already possiblle to buy those? Do you know where?

 

[2informaticos]

Apart of scrap boards, no idea...