x202e rev 2.0 no power

[kalilinux25]

Hi I have a problem with this board no power Ive tested the 5Vis present 3v is not present on my pmw rt8239bzqw pin 9 has no output of 3v



Plese guide me if this pmw is dead

[mcplslg123]

Re: x202e rev 2.0 no power

You need to check pin 15 for LDO 3.3V and pin14 for LDO 5V. If both are present and you dont have voltage on 3V coil-it may be suspend logic is involved and 3V will be present after switching on. Do check Entrip/FB pins as well. Btw, Pgood is present??

[stingerchamp]

Re: x202e rev 2.0 no power

In addition

Check ton resistor value , ton effects phase value

if ldo and logic is ok as suggested above

[ammarben]

Re: x202e rev 2.0 no power

1- perhaps L2 cut no continuity
2- ther is no feed back pin5 so check R6 and R7

[kalilinux25]

Re: x202e rev 2.0 no power

You need to check pin 15 for LDO 3.3V and pin14 for LDO 5V. If both are present and you dont have voltage on 3V coil-it may be suspend logic is involved and 3V will be present after switching on. Do check Entrip/FB pins as well. Btw, Pgood is present??

pin 6 has no voltage readings

[kalilinux25]

Re: x202e rev 2.0 no power

1- perhaps L2 cut no continuity
2- ther is no feed back pin5 so check R6 and R7

r6 and r7 has a coreect value

[kalilinux25]

Re: x202e rev 2.0 no power

1- perhaps L2 cut no continuity
2- ther is no feed back pin5 so check R6 and R7

pin 5 no voltages

[mcplslg123]

Re: x202e rev 2.0 no power

You didnt answered what is on pin14/15

[kalilinux25]

Re: x202e rev 2.0 no power

You didnt answered what is on pin14/15

pin 14 has 5v 15 has 3.3v sir sorry for late replies

[mcplslg123]

Re: x202e rev 2.0 no power

Try replacing the IC-may be bad.

[kalilinux25]

Re: x202e rev 2.0 no power

Try replacing the IC-may be bad.

Thanks sir Ill replace it and update you sir

[SMDFlea]

Re: x202e rev 2.0 no power

In your first post you say the chip is a rt8239b B ,the picture you posted is the A version. Make sure you have the correct part on the board,check the boardview

[kalilinux25]

Re: x202e rev 2.0 no power

In your first post you say the chip is a rt8239b B ,the picture you posted is the A version. Make sure you have the correct part on the board,check the boardview

do you have a boardview sir?

[kalilinux25]

Re: x202e rev 2.0 no power

Rt8239b

[stingerchamp]

Re: x202e rev 2.0 no power

Voltage on all pins?

Do you have same issue or resolved?