Dell Inspiron 3521 not (+3VS) and (+5VS)

[azhar2006]

good evening
I have a motherboard (la-9104p_r1.0)
How do I know the signal (SUSP) it works or not
I do not find (+3VS) and (+5VS)
Thanks in advance for helping me

[azhar2006]

Dell 3521 not (+3VS) and (+5VS)

good evening
I have a motherboard (la-9104p_r1.0)
How do I know the signal (SUSP) it works or not
I do not find (+3VS) and (+5VS)
Thanks in advance for helping me[/QUOTE]

[tibd]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

SUSP, I suppose (someone correct if I'm wrong) = SUSPend power signal at various power rails and functions in control during various power sequences. as of this board I think it needs SUSP# to be generated from +5VALW. The SUSP# is from kbc.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

thank you tibd

The 116 pin (KBC) was tested and there are (3.3) volts

[tibd]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

Did u check för +3 and +5VALW presence at QZ 1 and 7, or check pin 4 and 5 of these mosfets. Also check voltage of B+.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

Yes tibd (QZ1) and (QZ7) were found (+5VALW and +3.3VALW) and (B+_BIAS) are present (QZ3)
But there is no indication of the voltage on the pin4 to (QZ1) and (QZ7)

[tibd]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

What voltage on B+ do u get.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

By checking on (QZ3) get a pin4 (16 volt) And it works perfectly.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

tibd The Motherboard is just dead to a glowing LED lamp. No fan rotation or pull of the current on the screen of a power-equipped device

[ridamouh159]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

give US the voltage in all pins of PU200

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

I found lots of voltages worth (5v and 3.3v) I can not get closer to pins PU200

[tibd]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

Since u have B+, what voltages are there at RZ4 and RZ13, What is SUSP voltage, stays stable or fluctuate.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

Yes, there is a volt 19 volts but there is no outlet for the volt from the other end of the RZ4 and RZ13 0 volts ,, the SUSP voltage 3.3v in pin 116 for KBC

PQ902 goood

[raajkumar]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

Check capacitor on pu200 pins between pins 17 and 16.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

raajkumar Intensive (PC216) and (PC218) were examined on pins pu200 yes I found (19v) and (5v).
I doubt the (SUSP),,Because when I raise (QZ2BA) the motherboard passes the voltage through (RZ4) to the MOSFET QZ1

[tibd]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

if we take QZ1 for example.
Need B+_bias through RZ4 to pin 4 (gate), this open the mosfet and pass voltage from pins (5,6,7,8) to pins (1,2,3), this way you get the +5VALW to get +5VS. This is the normal scenario.
The other normal thing is that the SUSP will activate QZ2 and shorts the B+_bias to ground, this way you get gate (pin4) of QZ1 low and close the mosfet cutting +5VS.

If the QZ4 is dead or QZ2 is defective and already shorting b+ to ground then u will be missing +5VS. Since you mentioned that lifting QZ2 you are getting QZ1 to work normally then your problem is in QZ2 which is shorted, that's why u r not getting any voltage readings beyond first pin of QZ4. Replace the QZ2 and report.

[banuka]

Thanks lot.i have the same problem and after replace the qz2 problem have solved.

[tibd]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

you might still have some other problems with this board beyond QZ2 but start with this then proceed.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

Good evening tibd
thank you very much tibd
Yes I will try to apply what you said to me after dinner .. And I will accompany you to report what happens.
Thanks again . Another question too.

[azhar2006]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

You have replaced (QZ2) the same problem. It is a MOSFET(DUAL)
I noticed that lots of electronic pieces that hit their (SUSP#) signal do not work.

[tibd]

Re: Dell Inspiron 3521 not (+3VS) and (+5VS)

One thing here to make clear.
The +VALW will pass through to +VS at powering stages. At power press the SUSP# will then short SUSP to ground and thus +B_bias gets over to gates and open mosfets. At which stage S1-S5 r u measuring for +3-5VS. The problem might be somewhere else coz normally (if laptop is not running) the +VS voltages are not present.