Hi guys, this is my first post in this forum community!!

I need help with a system i´m trying to fix. I got an Emachines T1742. You can see the PC specifications here:

http://www.emachines.com/support/product_support.html?cat=desktop&subcat=T-Series&model=T1742

When i first took a look at this computer, the PSU was makin a strange noise, like craking nuts with a hammer. So i look the PSU and yeah, the PSU was damage. I asked the person how they turn of their PC and unfortunely i got a bad reply, some ppl have the tendency off turning the pc by removing the power cord from the power wall outlet. Maybe that explains the smell like fried cables from the PSU. The deal is this.

I try to add a 400w PS, and i got no response from the pc. Originaly, the pc has a 250w PS. the fan is not working, the CPU is working because the heat sink is kind of warm when i touch it, it gives me no cmos or bios check up, the HD led is always on just like the power led, no beeps, no video signal, no nothing... Is it because of the 400w PS?

So far my imagination has run out of fixing ideas. I try removing every device, changing memory, praying GOD, and still no response from the PC.

Can I get some help on this one guys...

Also can you can recommend a good Diagnostic card...??? So i can try and see if it is a motherboard problem???

ANy help will by higly appriciated!! GL and Happy holidays...

I'm not familiar with Emachines, but some OEM manufacturers use proprietary power supplies and motherboards. If Emachine does, you probably cannot use a generic power supply. If you did, the motherboard has probably been fried.
Maybe someone out there knows if a generic power supply can be used on an Emachine system.

With the abuse you have mentioned.I would start off by doing a complete cleaning of the computer. Then taking out the ram cleaning the ram slots and the ram stick pins gently with a clean pencil eraser.If you have 2- 64mb ram sticks instead of 1 -128mb I would try them 1 at a time.You did not post your e-machine model so I don't know your memory setup or size.I just assume 126Mb is really 128Mb.

Hi,

What started as a PSU problem, is now a motherboard problem. Emachines uses proprietary PSU's check the cabling on the 20 pin connector and you'll see what I mean.

good luck,

Tony

AMD Athlonxp 3200+ OC
Asus A7N8x-deluxe-E
ATI AIW 9600pro
2x WD SATA raptors/raid0
Corsair XMS3200
16x Lite-on DVD
12x DVD-R
48x Lite-on CDRW
Aspire Super Alien Case

Hello!! Thank you for you replies.

Okey, I think that someone mention that emachines use their own type of PSU the other day. I used a generic ATX and a micro-ATX PSU to check if the motherboard was working. I try removing every device and yes it only has 1 stick of ram. ANd yes, the ram is 128 mb and not 126mb. "My typing skills are not very good this days." The PC model is an emachines "T1742". and the link to the PC specifications is:

http://www.emachines.com/support/product_support.html?cat=desktop&subcat=T-Series&model=T1742

So as i mention before, i already try removing and cleaning the ram. But i think it doesnt even get that far in the boot procces. When i hook up the PSU to the motherboard and i turn on the switch on the PSU, the PSU starts automaticly. Just like when somone turns on a PC. But it happens without pressing the Power SW. Nothing works. The only thing that happens is that the heat sink gets warm and the Power and HD LED are on. BUt anything else doesnt work right. i try every removing every device and different combinations. I check that both PSU i was using work fine. I even check them with a power tester and they work fine.

Any ideas!!??

Hey,

As I have stated previously, you cannot use a standard PSU with an emachines computer!
Therein lies the problem.

What was a emachines PSU failure is now both a PSU failure and a motherboard failure. Quit attempting to try and fix the system with the PSU's you are using lest you ruin other components.

Tony

AMD Athlonxp 3200+ OC
Asus A7N8x-deluxe-E
ATI AIW 9600pro
2x WD SATA raptors/raid0
Corsair XMS3200
16x Lite-on DVD
12x DVD-R
48x Lite-on CDRW
Aspire Super Alien Case

Hi

I've had exactly the same problem with emachines 820 model. PSU blew up, I changed the PSU and found that the front LED's and PSU fan came on as soon as I plugged it in (i.e without actualy hitting the pc power on switch). I also noticed the heatsink was warm but nothing else showed any signs of life.

Let me know if you get yours running with an emachines PSU.

Neil

GPL, there is nothing proprietory about your Emachines power supply. Chances are when it failed it overvolted the motherboard, and possibly keyboard. The minimum to boot is processor, memory and a display to see what is going on. Taking out the CMOS battery for 5 mins can help sometimes.
A socket 478 replacement mATX motherboard looks in order here. There are some nice ones about with AGP graphics and dual channel memory. Unlees you get one almost identical to your Imperial GL board, you must buy OEM Windows.
Hope it helps, system7

hey guys it's not a psu problem it's a mother board problem, look on the motherboard on the side of the cpu that is closest to the back of the machine. you will find a total of 10 caps that are 6.3v 1500uf the tops of them will be puffed up and some will have some brown stuff on top of them. an emachine can use any power supply it does not have to come from emachines. you can try replacing the caps if your good at soldering and have a desoldering tool. I have fixed about 5 of the t1742's all had the same problem.

I have a similar problem except my T1742 won't turn on. No fans, or anything. I swapped the PSU but no joy. Any ideas? If i had a schematic or logic diagrAM, I could troubleshoot it myself. Where could this data be obtained?
Thanks
ronkibler

Thank you guys for all replies...

Well i order a new PSU made by emachines and after one week and still wating for it, i found the cause of the problem. jessegf was right. There is some brown stuff above 3 of the caps. Why i never notice stuff like that... geeee!!

anywayz im gonna try removing those caps and see if it works... Thank you guys.. Il keep you informed