Dell 1564 Dead

[sonunigam]

Hi all,
Recently a customer gave me a DELL 1564 core i3 which is dead. When i connect the charger the power LED turn on for a while then it turns off. But when i press the power button there is no power. I've checked the voltages on Power switch, it shows 4.96 volts rather than 3.3 Volts. I've changed ITE8502 but there are same voltages If anyone knows Which part is faulty then i'll be very thankful to him. Or plz give me any hint to check which part is faulty?
Thanks a lot.
I'm eagerly waiting for the reply.

[sonunigam]

Re: Dell 1564 Dead

Hi all,
I'm still waiting from anyone who give me the solution.
Plz help me out.
Thanks a lot. . . .

[spidey]

Re: Dell 1564 Dead

try flashing bios

[sasser]

Re: Dell 1564 Dead

if 19v,5v and 3.3v is present always prob with bios.try flashing bios. or do reset processor pull and place back

[dspok]

Re: Dell 1564 Dead

can anybody share me EC and Main BIOS dump for this model please.
It is intel VGA.

[nazrul145]

Re: Dell 1564 Dead

Hey try this bios.

[dspok]

Re: Dell 1564 Dead

Hey try this bios.

Thanks for the files nazrul.

[dspok]

Re: Dell 1564 Dead

Very hardwork for me.
Reflashed BIOS same problem, reflowed nch same problem, changed SIO same problem.

Problem is no display, no fan spin, just turns on.

Anybody please suggest.

[ridamouh159]

Re: Dell 1564 Dead

many thanks

[ravi_1617]

Re: Dell 1564 Dead

Hi Same board .
no charging
no turning on,3.3V_ALW_ON present.
no +5V_ALW
3.3 present at bios pin 3
4.98 volts present at power switch.
replaced TPS51427A.
should i repace IO chip

Thanks

[mcplslg123]

Re: Dell 1564 Dead

IO chip has nothing to do with 5V-so dont replace it. What is the impedance on 5v coil??

[ravi_1617]

Re: Dell 1564 Dead

reference to ground
Pl5 27.71 k ohm
pl4 .550k ohm

[mcplslg123]

Re: Dell 1564 Dead

+5V_EN, +15V present at tps 51427?? I hope you checked pq28/32.

[ravi_1617]

Re: Dell 1564 Dead

Sorry for late reply , +5V_EN not present pq 28/32 ok

[mcplslg123]

Re: Dell 1564 Dead

Schematic is avlbl for this mb. You need to find out why 5V EN is missing. I've given you the clue and now you need to dig it further.