MSI MS-16U11 3.3/5V SUS not work after liquid damage on VIN of ic

[ktmmotocross]

Hello.
Have this MSI MS-16U11 that have not working 3.3/5V SUS when i found corroded pin 12 if ic which is VIN pin. After replace and repair of pin i have REGs, VIN, EN. But still only 0.9V on one and 0.01V on other

[ktmmotocross]

Re: MSI MS-16U11 3.3/5V SUS not work after liquid damage on VIN of ic

Guys i need help. what can be pulling down voltages on 3.3/5V line?
i have regs, when i push start button i get only 1.4V on 3.3V line and 0.9V on 5V line

no shorts on lines, nothing gets hot. looks like it something tells ic to make low voltages
gates on mosfets get normal pulsed signal

nothing gets hot, i replacec IC, replaced dual mosfets, but still low voltages

[reformatt]

Re: MSI MS-16U11 3.3/5V SUS not work after liquid damage on VIN of ic

What do the LDO's measure? According to the datasheet, these are used internally in the IC for the drivers. They are only rated to 150ma, so doesn't take much to overload them. Any one of these being low could potentially affect the main outputs.

Failing that, this IC the outputs are preset with a max of 10% adjustment. Being that low, I'd be double checking the VBST1 and VBST2 components. But seems unlikely as both sides are affected.

[ktmmotocross]

Re: MSI MS-16U11 3.3/5V SUS not work after liquid damage on VIN of ic

both ok

[reformatt]

Re: MSI MS-16U11 3.3/5V SUS not work after liquid damage on VIN of ic

I actually replaced a 51225 y'day on suspicion for a shutdown issue. The outputs all measured low. Put on another one and was ok (Aliexpress sourced chips). Maybe you have a bad IC. Check the boost capacitors PC97/98 as well.

[ktmmotocross]

Re: MSI MS-16U11 3.3/5V SUS not work after liquid damage on VIN of ic

i rplaced ic two times from two sellers. same results.

i noticed when start LDO 5V goes to 4.8V