Dell inspiron 3521 Power Problem

[raajkumar]

Hi friends,
I checked the mobo but +VCC_CORE and +VCC_GFXCORE_AXG not coming. Is anyone having same experience ?

[raajkumar]

Re: Dell inspiron 3521 Power Problem

I need the boardview for this mobo. Can any person sharing with me ?

[Djosla]

Re: Dell inspiron 3521 Power Problem

What board do you have...what are the symptoms? No display or something else ?
Do you have 3.3v and 5v first ?

[raajkumar]

Re: Dell inspiron 3521 Power Problem

What board do you have...what are the symptoms? No display or something else ?
Do you have 3.3v and 5v first ?

Board is LA-9104P 3.3V not coming 5V also

[cyberhack]

Re: Dell inspiron 3521 Power Problem

Lets start with schematic

[Djosla]

Re: Dell inspiron 3521 Power Problem

So your machine is completely dead ??? first put laptop on ac charger,measure this and post:
1. B+ voltage on PR102
2. pu200 pins: 1,6,13,16

After that remove charger and measure resistance to ground :
3. pr102
4.PL200,PL201

[raajkumar]

Re: Dell inspiron 3521 Power Problem

I need Boardview Also for this. Anyone having please send it to me.

[meritosari]

Re: Dell inspiron 3521 Power Problem

Today for this platform, have no boardview (may be confidential)

[HarryPK]

Re: Dell inspiron 3521 Power Problem

it is true, the file is very confidential

[Djosla]

Re: Dell inspiron 3521 Power Problem

you don`t need board view almost everything is labeled...

[keeney123]

Re: Dell inspiron 3521 Power Problem

I would check the RTC Battery Voltage. If that were not good then I would put in a new battery and flash the bios once again.

[raajkumar]

Re: Dell inspiron 3521 Power Problem

RTC Battery Voltage is OK. I checked at JP12 and its coming 3.02V But i can't see +3V Pgood and any 3Voltage from any point of this motherboard.

[raajkumar]

Re: Dell inspiron 3521 Power Problem

I checked PQ202. it shows 19.6V at the input but it is not giving output so i checked it but its working. now i have doubt on PU200. Is there anyone having any ideas?

[meritosari]

Re: Dell inspiron 3521 Power Problem

My idea is that you must follow advice on post#6

[raajkumar]

Re: Dell inspiron 3521 Power Problem

So your machine is completely dead ??? first put laptop on ac charger,measure this and post:
1. B+ voltage on PR102
2. pu200 pins: 1,6,13,16

After that remove charger and measure resistance to ground :
3. pr102
4.PL200,PL201

When i am measuring PU200 pins: 1,6,13,16 something happened by mistake it was short circuited and it was burnt. thereafter i removed PU200 and checked PQ101 also short circuited. i removed PQ101 and PU200 chips. Now i measured resistance to ground on PR102, PL200 and PL201 it shows, PR102 and PL201 shows 0 ohms and on PL200 shows 0.834K ohms.

[meritosari]

Re: Dell inspiron 3521 Power Problem

What kind of test leads do you use for probing small IC?

https://www.badcaps.net/forum/showth...obe+multimeter

[raajkumar]

Re: Dell inspiron 3521 Power Problem

Actually i am using Sanwa CD800a DMM.

[aanan]

Re: Dell inspiron 3521 Power Problem

+3v power good signal pu 200 pin no 23.

[meritosari]

Re: Dell inspiron 3521 Power Problem

Actually i am using Sanwa CD800a DMM.

First, you have to dig many information before doing anything that you don't know how to do it. BC/badcaps.net have a lots "case study", informations, use to increase your knowledge.

in this case, I worry may be currently your probes are original from packages, not really sharp, best Idea using probes sharp point.

It takes good eyes and a steady hand. There's no doubt about that.

Make some prepare, hold your breath to avoid shaking while probing. Test contiunity around the IC there which connected to Cap or Resistor and put them as your test point, not direct to pin the IC

[raajkumar]

Re: Dell inspiron 3521 Power Problem

First, you have to dig many information before doing anything that you don't know how to do it. BC/badcaps.net have a lots "case study", informations, use to increase your knowledge.

in this case, I worry may be currently your probes are original from packages, not really sharp, best Idea using probes sharp point.



Make some prepare, hold your breath to avoid shaking while probing. Test contiunity around the IC there which connected to Cap or Resistor and put them as your test point, not direct to pin the IC

I already replaced the meter probes as thin like needle. That is not the problem. This happens by-mistake. There are some SMD components nearby to PU200 without component ID. That's what i asked Boardview. But now i fixed this by replaced PU200 and PQ 101. Now its working fine. Thanks to everyone to helping me to fix this.