No power viwgp/gr la-9632p rev 1.0

[kalilinux25]

Hi good day I have this problem I change for shorted nothing had found 19V POWER RAIL is present +5ALW IS NOT PRESEN how to find the possible problem for this boardt

[Techtiger]

Re: No power viwgp/gr la-9632p rev 1.0

voltage on PU402 all pins except GND & resistance PL404, try to remove PJ402 jumper and see if voltage is back

[kalilinux25]

Re: No power viwgp/gr la-9632p rev 1.0

First test all pin in the PU402 pin 1,2,3,4, has no voltages 5,6 has 3.3v
Second check the resistance of PL404 800 ohms
3rd remove the PJ402 jumper
4th check voltage in jprb1 pin 1 has no voltage present

[Techtiger]

Re: No power viwgp/gr la-9632p rev 1.0

Do you have 3.3V PL402? Your voltage measurements are not correct PU402
Pin 8/5/7 +5v Check PL403 or +B line or change that IC

[kalilinux25]

Re: No power viwgp/gr la-9632p rev 1.0

Do you have 3.3V PL402? Your voltage measurements are not correct PU402
Pin 8/5/7 +5v Check PL403 or +B line or change that IC

pl402 no voltages +B line on pin 8 has 20 v

[kalilinux25]

Re: No power viwgp/gr la-9632p rev 1.0

pl402 no voltages +B line on pin 8 has 20 v

I already tried to change the PU402 but no power

[mcplslg123]

Re: No power viwgp/gr la-9632p rev 1.0

Do you have 3.3V PL402? Your voltage measurements are not correct PU402
Pin 8/5/7 +5v Check PL403 or +B line or change that IC

Are you sure about that?? Pin8 should be 20V,pin5 should be 3V in my opinion.

[kalilinux25]

Re: No power viwgp/gr la-9632p rev 1.0

Are you sure about that?? Pin8 should be 20V,pin5 should be 3V in my opinion.

good day sir , I have the excat correct reading pin 8 has 18v pin 5 has 3v

[mcplslg123]

Re: No power viwgp/gr la-9632p rev 1.0

Sorry for the goofup@kalilinux. I was partially wrong as i mistakenly looked at PU401. It should be +20V on pin 8 but +5V on pin5 of PU402 as pin5 is +5VCC. The basic input for working of PU402 IC is +5VCC(pin5) and VIN(pin8) and after that you should have EN signals for it to produce LDO output. So something is wrong here. You need to findout why you are getting +3V at pin5 of PU402 instead of +5V??