dell 7240 motherboard no power

[sureshbobby]

Hi friends
i need help for dell 7240 laptop which motherboard is LA-9431p
No power issue.
i have checked for short not found but the PU100 ic is heating up.
please help

[Techtiger]

Re: dell 7240 motherboard no power

Is the PQ700 switching +19V ? Is 3/5 ALW ok if not Resistance to GND pl101 102 ?

[sureshbobby]

Re: dell 7240 motherboard no power

Yes at PQ700 19v is ok. but how to check resistance and PL101 PL102

[Techtiger]

Re: dell 7240 motherboard no power

Put the multimeter in ohms mode and test so 3/5V not Present?

[andresi]

Re: dell 7240 motherboard no power

help, my latitude 7240, after plug adapter cant booting, no display, just power led blinking in 1 x 20 sec and i cant turn off it, i test in 19 and 5,3v is normal, i check bios voltase is normal. i have already flash any bios but not working, any Solution? btw this my Bios Ori.

[SMDFlea]

Re: dell 7240 motherboard no power

help, my latitude 7240, after plug adapter cant booting, no display, just power led blinking in 1 x 20 sec and i cant turn off it, i test in 19 and 5,3v is normal, i check bios voltase is normal. i have already flash any bios but not working, any Solution? btw this my Bios Ori.

bios requests go here: https://www.badcaps.net/forum/forumdisplay.php?f=40

[ravi_1617]

Re: dell 7240 motherboard no power

Is the PQ700 switching +19V ? Is 3/5 ALW ok if not Resistance to GND pl101 102 ?

Hi same problem ,
PU100 heating up.
+DC1_PWR_SRC power showing around 13.5 volts.

Opened PJP101 showing resistance 23 Ohms

Opened PJP102 showing resistance 15 Ohms

Couldn't find any short .
Anything I am missing
Thanks