Dell inspiron 3521 la-9104p dead

[chandana kumara]

Re: Dell inspiron 3521 la-9104p dead

thank you

[Chieftain]

Re: Dell inspiron 3521 la-9104p dead

thanks for the file sharing...

[sourcebf]

Re: Dell inspiron 3521 la-9104p dead

Model-Dell Inspiron 3521
M/B-La-9104p rev 1.0(A00)
Problem-Dead

The ene kbc was shorted, so i replaced it with a new one and programmed it as well with Rt809F. unit still has no 3.3v

I have tried the following:

01. Replaced another new kbc and programmed-still same
02. Replaced Pu200 with TPS 51125-still same
03.Replaced Pu100(ISL88731)-still same.
04. There is no short on 3v and 5v coils(PL200 & PL201)
05.Tried flashing both Eprom's-still same.

I have noticed one thing which has left me puzzled--If i connect pin16 of Kbd Connector(which is connected to pin 42 of KBC) to Ground-all voltaged appears on the board-3.3v at battery terminals and power switch. Mb wont turn on simply coz connecting pin 42 of kbc to Gnd means KBC is in programming mode.

So whats wrong???
Please advise friends as i have run out of ideas.

I m sure that tps51125 does not replace RT8205L in your case Because I have already tried it in this model, but i don't know why

try to find out RT8205L

[mcplslg123]

Re: Dell inspiron 3521 la-9104p dead

I m sure that tps51125 does not replace RT8205L in your case Because I have already tried it in this model, but i don't know why

try to find out RT8205L

Replaced RT8205L with TPS51125 on not less then hundred motherboard on dell 3521 and it works 100%. I dont know how you are sure.

[hussaka]

Re: Dell inspiron 3521 la-9104p dead

Thank you

[cowboype]

Re: Dell inspiron 3521 la-9104p dead

This is schematic and bios dump,
have you a short on 3.3v <-- EC ?

Great. Works fine. Thanks.

[ggioo]

Re: Dell inspiron 3521 la-9104p dead

You save me. thank you. it works.

[banuka]

Re: Dell inspiron 3521 la-9104p dead

Hi guys,
Dell 3521 laptop 3v pch is not presents.qz3 gate voltage missing.if i remove qz4 laptop is powering on.can anyone help me?

[mcplslg123]

Re: Dell inspiron 3521 la-9104p dead

You need to give measurements for QZ3 pins with the mosfet soldered. Else a shorcut is to just solder JP2 Pad pin1-2 together and remove QZ3.