A7S333 1 long beep 3 short beep and shut down ?

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

On POST code diagnostic I got C1 and motherboard is off after that....
What does it say to me ? any experiences ?

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

can it be the audio modem chip is short and making all the system shutdown...?
It's the closest to LM78L05
https://cdn.badcaps-static.com/pdfs/...c2f51bc7b4.pdf

[vinceroger69]

Re: A7S333 1 long beep 3 short beep and shut down ?

C1
Detect memory
-Auto-detection of DRAM size, type and ECC

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

but it shut off after showing C1.....how do you reckon ? is it something wrong with my VRM
? I've replaced all the FET and Caps...but no avail...could be my buck controller and driver ?
NCP5322 ?

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

LM78L05ACM is connected directly to 74HC4053...which a logic HCMOS chip...
I have no idea what's it doing yet ??

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

74HC4053, could it be died already ? and making the system shut off ??

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

exact chip :

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

Is it possible that I get a corrupted BIOS ?

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

can I upload this one
http://dlcdnet.asus.com/pub/ASUS/mb/...316.1472338911
straight away with chip flash programmer ? thanks

[diif]

Re: A7S333 1 long beep 3 short beep and shut down ?

1 long and 3 short beeps is no VGA detected.

https://www.asus.com/support/faq/1029959

Are you testing with a known quality working PSU ?

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

Yes I'm using a working PSU...I've tested this PSU with other mobo...works ok...
I will try changing buck controller and see...

either death buck or corrupted BIOS or both...

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

I got progress....I've replaced all the FET and now it bot until displaying C1C1 on POST diagnostic...beep...and shut down...
I think it's NCP5322 buck controller not right....
Do you reckon ?

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

from physical appearance, looks like NCP5322 buck controller is burned, please have a look at the photo...

[diif]

Re: A7S333 1 long beep 3 short beep and shut down ?

Are you serious ? You can't see anything in that photo.

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

Can't you see the chip next to CPU on the right ?....ok, I'll try taking picture again...

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

Another photo...hope it's better now...

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

I can't read the label on NCP5322, because of burn I suppose...must take a good closer look with magnifying glass to see its label....

[momaka]

Re: A7S333 1 long beep 3 short beep and shut down ?

Buck controller seems fine to me.

Why do you always think it's the buck controller that's the problem?
Honestly, from all of the motherboards I got in for repair, I've never had to replace a buck controller. Maybe a few FETs and the occasional FET driver. The buck controller is protected pretty well.

[bianchi77]

Re: A7S333 1 long beep 3 short beep and shut down ?

I have replaced all the FETs and it's still happened....turn on trying to POST and shut off after few seconds ?? do you know what else then ?