inspiron 660 mobo replacment

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Krishna Moorthy

Krishna Moorthy

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if you or a friend have spare parts try them out. Troubleshoot all your parts and see what is wrong it might not be your motherboard. May be a dead cpu or dead graphics chip or it could be you mobo. ITs not your psu because your fans are spinning.
 
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chenmsb

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Krishna Moorthy

Krishna Moorthy

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Pardon you didnt reply anything xD
 
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chenmsb

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thanks krishna Moorthy,

my video card:intel HD, processor:Intel core i3-2120 how could I troubleshoot them? I searched dell website and did troubleshoot as they suggested. all results are same: power on fans running,no beeps no post. I reseated cpu the other day. where I can find new one if I have to replace the mobo? thanks for your help?
 
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chenmsb

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Krishna Moorthy

Krishna Moorthy

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Do you know anyone who may have spare pc parts you can trouble shoot by replacing your cpu, with a different one and seeing if that is the problem. If any of your parts are stil under warranty you can get the manufacturer to test it out to see if it is broken.
 
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chenmsb

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I bought it from dell online year and half ago. 1 year warranty expired. dell would not help. I'll try to find the way to test cpu. I can find one online if I need replacement. After that I'll call dell support to see if they help with the mobo.
 
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Krishna Moorthy

Krishna Moorthy

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okay lemme know what your gonna do
 
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thenh813

thenh813

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@chenmsb

Just a hint: the PSU could be very dead ans still spin the fans. A half dead 9V battery will power a case fan at half max speed. Reconsider th e PSU being dead if anything else points to a dead or faulty one. If a PSU fails it can murder other components, not usually the CPU but the MB, HDD and GPU can be fried by bad voltages and are suspect if replacing a definitely bad PSU does not bring life back to the PC.


Consider borrowing a Multimeter if you dont have one, remove the PSU and test it.
Use the paperclip trick to power up the supply after taking it out of the case.
Now come my self-quote
This will help rule out PSU if the MB will not power up/keep powering off.
It is very likely the PSU and I would reccomend using the paperclip trick:
http://aphnetworks.com/tutorials/psu_paperclip_trick

Please try the test and post back the voltages on EVERY wire.
You will need a analog or digital voltmeter to check these values.
Good voltages:
Orange to black: 3.3v [3.0v-3.7v]
Red to Black: 5v [4.5v-5.5v]
Yellow to black: 12v [11v-13v]
Grey to black: 5v [4.5v-5.5v]
The grey wire tells the CPU to start up.
Blue to black: -12v [-11.5v--13v]
Purple to black: 5v [4.5v-5.5v] (with paperclip removed)
The purple wire powers the MB when it is in standby of off.
Black to black: NOTHING [-0.100-+0.100]

If the voltages are not within the mentioned ranges, something is wrong.
If they are OK at no load without anything plugged in, add a load
like a medium size 12v electric motor or 50W Halogen light to the 12v rail
and retest all values, if any are off the limits the PSU is JUNK and should
never be attached to hardware again. If the values are close to the limits,
leave it running for a hour and retest again, if any are off the limits it is dead.

Hope this can help, if the PSU is bad testing other components will begin with
a new or borrowed know good PSU.
Click to expand...

Problems like yours are commonly cause by one of the most common PC failures, the PSU.

If the PSU is OK, the MB is likely dead or has a extremely faulty component connected.
(Iv seen a bad HDD cause a no post situation once before, because it shorted out the IDE bus)
Even though this post is 19 days old, it is unsolved and most definitely still open, so I decided to help.
It isnt much older than two weeks, and I hope the fact that you didn't reply means you got it fixed.
Please rely with a status update on the current situation, me and Krishna Moorthy would probably
like to know.

@Krishna Moorthy
HAH I know that avatar anywhere!
Steins;Gate, right? I have watched it a couple times.
One of the best Anime I have ever seen so far.
 
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Krishna Moorthy

Krishna Moorthy

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yes :D makise Kurisu <3
 
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chenmsb

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sorry for late replay. I tested today as you suggested(the results below). Any further suggestion would be great. Thanks for your help!

Pin Name Color No load Full load
1 +3.3V Orange +3.3 VDC 3.37 3.37
2 +3.3V Orange +3.3 VDC 3.37 3.37
3 COM Black Ground
4 +5V Red +5 VDC 5.09 5.05
5 COM Black Ground
6 +5V Red +5 VDC 5.09 5.05
7 COM Black Ground
8 PWR_ON Gray Power Good 5.02 4.63
9 +5VSB Purple +5 VDC Standby 5.04 5.03
10 +12V1 Yellow +12 VDC 12.17 12.25
11 +12V1 Yellow +12 VDC 12.17 12.25
12 +3.3V Orange +3.3 VDC 3.37 3.37
13 +3.3V Orange +3.3 VDC 3.37 3.37
14 -12V Blue -12 VDC -11.93 - 11.95
15 COM Black Ground
16 PS_ON# Green Power Supply On
17 COM Black Ground
18 COM Black Ground
19 COM Black Ground
20 NC White -5 VDC (Optional - Removed in ATX12V v2.01)
21 +5V Red +5 VDC 5.09 5.05
22 +5V Red +5 VDC 5.09 5.05
23 +5V Red +5 VDC 5.09 5.05
24 COM Black Ground






 
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thenh813

thenh813

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It seems that the voltages are fine, the power supply appears to be OK. Then your problem is probabally linked to the Motherboard or something connected to it. Maybe you could try removing everything but the CPU, this means disconnect and remove the HDD, GPU (if a separate card), and remove the RAM. IT should beep and complain of no RAM installed when powered on. If no beeps, you are almost guaranteed the MB is dead. *Sigh* I wish I had noticed you posted sooner, I feel bad because after a week I stopped checking. Hopefully you can get this fixed or have already done so.
 
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chenmsb

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I also connected the HDD to my laptop. it's working and all the files are there. If the MB has to be changed. what the best option, thanks for your help




Thanks for your help! I did check. It beep after I removed the ram and power on. I am still trying to figure out is it MB or some thing else ? Any suggestion would be great..




 
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Viv Cyriac

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Mar 16, 2015
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I have the same issue. I removed everything. The MB beeps after removing the RAM and powering on.
 
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