rx6600xt

[Franito]

I have a rx6600xt in the same situation.
The first pin of npc81022 ( powerok) has 0 v, and doesn't activate the other and gates.

I'm not sure if I can bridge with powergoods.

I don't have the schematic for this gpu sapphire, and i dont know why I don't have power ok if all coils are marking good voltages.

¿Maybe gpu core dead?
I see in a msi schematic powergood and powerok are bridged wwith a resistance, but in my gpu this place is empty.

[прямо]

I have a rx6600xt in the same situation.
The first pin of npc81022 ( powerok) has 0 v, and doesn't activate the other and gates.

I'm not sure if I can bridge with powergoods.

I don't have the schematic for this gpu sapphire, and i dont know why I don't have power ok if all coils are marking good voltages.

¿Maybe gpu core dead?
I see in a msi schematic powergood and powerok are bridged wwith a resistance, but in my gpu this place is empty.

POWEROK is an output signal from the NCP81022.
It will only go high if the chip is not dead and working correctly.

You CAN'T bridge this signal to POWERGOOD signal from another buck controller regardless of what the MSI schematic say.

[Franito]

POWEROK is an output signal from the NCP81022.
It will only go high if the chip is not dead and working correctly.

You CAN'T bridge this signal to POWERGOOD signal from another buck controller regardless of what the MSI schematic say.

It's dead gpu core or dead npc81022 Or what?

[ktmmotocross]

It's dead gpu core or dead npc81022 Or what?

we dont have crystall ball for u. learn, measure and U can resolve it

[прямо]

It can be any or a combination of these:

- dead NCP (almost never happen, imho)

- dead VCORE mosfet driver
- out of spec VCORE mosfet driver, or aging mosfets that are unable to meet the mosfet driver switching time requirements.

- broken connection between VCORE mosfet driver and NCP.

- broken connection between VCORE mosfet driver and the mosfets.

- faulty current sensor, triggering OCP (over-current protection) of the NCP, so it is cutting off all PWM signals going to the VCORE mosfet drivers.

- missing or out of spec component like a resistor or a capacitor (some caps have to exist to filter out noise, otherwise a chip can't work properly)

Read the NCP datasheet and the mosfet driver datasheet to understand how they are supposed to work together.

Be patient and check every components for anything that may look off/suspicious (discolored components, factory flux leaking out, green/white tarnished solder joints)

Keep a repair journal so you don't forget things.

Take a break and come back later.

[Franito]

Sorry, I removed a resistance from pin 52.
And then the card made a weird noise like a microwave, and then I have short in 1.35v,5v and 0.9v.Crazy thing is still working the gpu rail

I'll try to remove gpu chip and see shorts go off