Re: Asus P4c800 Deluxe no POST
Neither I have an hot air station, but the problem could be the SB. I have to re-check the voltages... I have NO BEEPS or voice in speakers.
Bye
nicolati
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Last Activity: 11-17-2008, 02:28 AM
Joined: 09-10-2008
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Re: Asus P4c800 Deluxe no POST
Hi guys, after my last passed exam at university, I'm free to check this MB.
I opened the socket and there is one part of it with pins much in and one part much out. But NOW the MB start without processor. It was only rested for a month... The processor was checked by a friend on another P4C800 and it start for a while, after go in protection and the system shut down. I noticed that the silver thermal compound, if it is out of processor, the system doesn't boot up; so I removed all the compound and much out of hole in the processor (this procedure...Leave a comment:
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Re: Asus P4c800 Deluxe no POST
Hi, battery is fine (3 Volt). I opened the socket and fixed some pins with my hands; maybe I have to fix much.
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
If you say electrolitic caps, I have one big near DIMM and several near CPU socket.
Bye
nicolati...Leave a comment:
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Re: Asus P4c800 Deluxe no POST
Ok, but where i test vdimm and vcore. I don't know the points.
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nicolati...Leave a comment:
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Re: Asus P4c800 Deluxe no POST
Q1: I remember that I removed BIOS chip and beeps there are, so hardware implementation I think. And one time it said me "No CPU installed", when CPU there wasn't.
Q2: that's problem. My MB doesn't power on without CPU. It try, but after 1 sec or less it shot down.
Bye
nicolati...Leave a comment:
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Re: Asus P4c800 Deluxe no POST
Ok. So I have two problems. Or MB doesn't work or CPU doesn't work. I can't test CPU because I haven't other socket 478 MB (and CPU)
.
To test if CPU is faulty: the MB beeps and talks are CPU dependent ? If the power on, as you said, is CPU installed dependent, it means a working CPU or whatever CPU ?
Thanks.
Bye
nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
The HJ... I don't think is broken. I'll repeat tests. Does the MB power on without CPU ?
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
The 78L05AC is input 12V and output 5V, as you said.
The other is H J 882 3DTA. There are two of these and one of H J 772 3ETB.
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
VDS = 0.09 V
VGS = 1.91 V
VGD = 1.8 V
This FET is broken, for me. It's always cold, even when the others are hot.
However, if I power on the MB WITHOUT the CPU, it should power on, isn't it ?
My MB doesn't.
Bye
nicolatiLast edited by nicolati; 09-12-2008, 05:32 AM.Leave a comment:
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Re: Asus P4c800 Deluxe no POST
DS = 45 Kohm
GD = 48 Kohm
GS = 2.7 Kohm
Diode junction = 477 mV
There is a problem with GS resistance.
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
On that FET the voltage is stable at 1.91 V and it's cold.
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
The FET is marked 3310h...something and in some Russian forums they talk about that. If I test this FET badly, I can destroy sometihng else?
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
Yes, looks like a short, but I don't know how. The MB's owner is my friend. His case is a Silverstone and he has only Noctua fans, but he has a very very economic PSU.
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
It was under a line of CPU.
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nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
[URL=http://*************][/URL]
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[URL=http://*************][/URL]
Those are photos.
Any suggestion ?
Bye
nicolatiRe: Asus P4c800 Deluxe no POST
[URL=http://*************][/URL]
[URL=http://*************][/URL]
[URL=http://*************][/URL]
[URL=http://*************][/URL]
Those are photos.
Any suggestion ?
ByeLeave a comment:
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Re: Asus P4c800 Deluxe no POST
Yeah, a 31...something is strange. I'll post photos soon.
I understand you Gianni, thanks for the reply.
Bye
nicolatiLeave a comment:
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Re: Asus P4c800 Deluxe no POST
Gianni, scrivo in italiano, che è meglio!
Intendo che non ho dato corrente alla mb, solo tensione (LED verde). Inoltre intendo che ai capi dei regolatori o c'è tensione instabile o non c'è ( 0 V ).
Solo che non so se ho misurato bene. Dovresti spiegarmi come misurare.
Grazie.
CiaoLeave a comment:
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Re: Asus P4c800 Deluxe no POST
I add that a electrolitic capacitor is lightly up, but it doesn't seem damaged. I tested 3 voltage regulators with PSU on (green LED) but power off and all of them have a 0.00 V or a variable voltage. I don't know if I tested well; how are they testing ?
Bye
nicolatiLeave a comment:
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Asus P4c800 Deluxe no POST
Hi guys. I have a P4C800 Deluxe that doesn't execute POST.
I tell you the story:
1) One day the system didn't boot and the MB said "System Failed CPU Test".
2) I saw the solder glob under MB shorts with a PAD near it, under pressure of heatsink (known problem). I removed a few solder to eliminate the short. The MB didn't talk me anything yet. It's mute and doesn't POST.
3) The MB doesn't power on, if the CPU is not installed, only green LED.
4) I saw a SMD capacitor and a resistor near Power Switch partially burned. No any other caps (specially electrolitic...
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