Re: Bad DIMM slot on old ASUS M5A78L-M LX Plus
Thanks! I think that I'll try using IPA and a toothbrush a few times first before trying the partial insertion of the RAM.
Very interesting! I find that sometimes if I let a machine sit for a long time (at least a year) without powering it up, it will misbehave the next time I power it up and I then have to take all the cards and RAM out and put it all back again to get it to work right. The contacts need to be wiped against each other to remove the oxidation, I assume.
That...
tj2
Senior Member
Last Activity: 04-13-2024, 06:37 PM
Joined: 10-09-2009
Location: Central New York
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Re: Bad DIMM slot on old ASUS M5A78L-M LX Plus
I understand what you are telling me to do, but are you saying that this will check to see if the problem is a dirty DIMM socket? I will try what you suggest when I next have the chance.
How did you clean the DIMM socket? Did you need a small brush or something similar?...Leave a comment:
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Re: Bad DIMM slot on old ASUS M5A78L-M LX Plus
A minor update...
I took out the CPU and cleaned the socket well with quick-dry electronic cleaner and let it dry.
I inspected the pins of the CPU and all are straight and line up nicely. I booted with 16 GB of ECC RAM but the system still only saw 8 GB, so I took out the RAM and put in two known-good 2 GB sticks of non-ECC RAM. Now the system only sees 2 GB of RAM. No firmware update or special hardware version should be necessary to see this full amount and kind of RAM.
I'll have to test...Leave a comment:
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Re: Bad DIMM slot on old ASUS M5A78L-M LX Plus
DynaxSC, Thanks very much for the detailed reply!
1) Surely there are different revisions of the board, but I don't know about them or if it makes any difference.
2) If this were an LGA socket, this would be a great thing to check, and fairly easy. (I work on mechanical watches, so I have tools to see and manipulate very small objects.) But the M5A78L-M LX Plus supports AMD processors, not Intel ones, and the socket is an AM3+ PGA socket. I'll try spraying the socket with contact cleaner. The board did...Leave a comment:
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Re: Bad DIMM slot on old ASUS M5A78L-M LX Plus
I'm aware of that statement, however it's false according to several forums and at least one Amazon review of the board--where several people have successfully used a total of 16 GB--and, in any case, the board won't POST with one 8 GB stick in the slot closer to the CPU (or even a 4 GB stick), but it will POST with one 8 GB stick in the slot further from the CPU. It'll POST with an 8 GB stick in each slot, but only see one stick. It seems to me that there's something wrong with the closer slot. A BIOS update didn't...Leave a comment:
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Bad DIMM slot on old ASUS M5A78L-M LX Plus
I'm looking for some help with an inexpensive used ASUS M5A78L-M LX Plus board I got recently. I'd like to max out the RAM at 16 GB, but one DIMM slot works and the other does not. With one 8 GB stick it only boots with the RAM in the outside slot, and if I put two 8 GB sticks in, only 8 GB total are seen by the BIOS and OS. I don't see any obvious physical damage to the board--no shorts or bad solder. Does anyone have any ideas on what to look for and what I might do to fix it? I suppose that the most likely thing is damaged contacts within the slot. I don't like the idea of unsoldering the old... -
Re: Reasons for sound cutting in/out
I just repaired an amp I got used that had an intermittent left channel. I turned out to be a cracked circuit board––the crack went right through a trace in the signal path. The crack was hard to see at first.Leave a comment:
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Re: motherboards in storage?
I had a DFI/Itox GCB60BX motherboard sit for a few years, never having been powered up. Some of the caps burst in the package, leaving a mess. They were not good quality caps, though. So yes, it can happen....Leave a comment:
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Re: Delta DPS-280FP suddenly not starting after recap
As long as the KMG works, I'd leave it in. Its ripple rating is 40 mA rather than 66 mA, but that probably doesn't matter. Perhaps someone else has a better idea of how stressed this cap is. I'd guess not very.Leave a comment:
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Re: Delta DPS-280FP suddenly not starting after recap
If you want to replace the 10 uF LTec, you might try a Nichicon PW, Panasonic FC, or something similar. Probably a general purpose cap will do as long as it's 105 C rated. What voltage and series is the LTec?Leave a comment:
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Re: Delta DPS-280FP suddenly not starting after recap
I've found that in some PSUs there is a cap, perhaps a 22 uF 50 V, that will prevent start up if it has an ESR that's too different from the original. I recapped a PSU recently that wouldn't start up afterwards. The 5 VSB was fine but when I shorted the power-on line, the PSU would briefly spin the fan and light up my dummy load, but then immediately shut down. When I replaced the new Panasonic FM 22 uF 50 V cap by a Nichicon TT, it worked correctly. The Nichicon was reasonably close to the original cap in ESR but the Panasonic...Leave a comment:
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Re: Help me identify blown component Dell 8400
Be careful when you order. It used to be that the Dell PSUs had a pinout that was different from the standard ATX pinout. If you connected a Dell motherboard and standard ATX PSU or a standard ATX motherboard to a Dell PSU, you got flames and a ruined motherboard and a ruined PSU. I don't know if Dell still uses non-standard pinouts, but it would pay to check....Leave a comment:
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Re: samwha cap question...
The Rubycon should work. The WL is the series of the capacitor made by Samwha.
If you check the datasheet on the Samwha WL series, you'll see that the ESR
of a 2200 uF 10 V capacitor is 50 mΩ and the maximum ripple current is 1400 mA.
The Rubycon ZL 2200 uF 10 V capacitor has a 21 mΩ ESR and a maximum ripple
current of 2360 mA. You can find the datasheet on the WL at
and the datasheet on the Rubycon ZL series at
[url]https://cdn.badcaps-static.com/pdfs/55c5a159697fc5aca4d7e3d3dded1822.pdf[/url].Re: samwha...Leave a comment:
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Re: Power Mac G4 MDD "Mirror-Door" won't power up
Thanks, Toasty! For my efforts our lab tech has obtained three more Macs as backups. Two are MDD Macs with the Samsung PSU -- one working and the other with another failed open primary cap in the PSU. The other doesn't work but is a different model and has an AcBel PSU. I'm going to recap the two Samsung PSUs, but I think that I'll give a pass for now on the other Mac. The department is going to owe me for even more capacitors!
I thought about the SMQ, but for some reason the GW grabbed my attention. ...Leave a comment:
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Re: Power Mac G4 MDD "Mirror-Door" won't power up
To answer my own question, these Samsung PSUs contain the following capacitors. As the GL caps are not standard for that series, I estimated the ESR (@ 20 C & 100 kHz) and ripple from others of the same dimensions in the series.
1x CapXon HP 390 uF/420 V 35x42
5x CapXon GL 2200 uF/10 V 10x25 57 mΩ 1400 mA
2x CapXon GL 2200 uF/16 V 10x30 35 mΩ 1815 mA
1x CapXon GL 1000 uF/35 V 13x25 36 mΩ 1950 mA
1x CapXon KM 470 uF/35 V 10x20
1x CapXon KM 47 uF/25...Leave a comment:
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Re: Power Mac G4 MDD "Mirror-Door" won't power up
Does anyone have a list of caps in this Samsung power supply? (capacitance, voltage, dimensions, and perhaps original brand/series, or replacement brand/series, or ESR and ripple)
I'm looking at repairing, and probably fully recapping, one of these but I am under some time pressure as we need to get it working by the time the semester starts. The Mac with this power supply hosts a data acquisition board for a laboratory experiment. I'm at least going to order a new fuse, a new primary cap -- the old one...Leave a comment:
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Re: What is this? From board on range hood
If you know what the traces should be on the missing chunk, it looks fixable to me. I'd guess that the missing chunk only held a pad for one lead and part of a pad for another. There is also a broken trace, which can be fixed by soldering a wire jumper across the break after you epoxy the crack so that it doesn't propagate. Do you have the missing chunk to check the missing traces?
What is the white "fuzz" on the component side of the board? It looks worrying.Leave a comment:
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Re: What is this? From board on range hood
There are products to fix broken circuit boards. Post pics of the damage; I'm sure that someone will know what to do.Leave a comment:
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Re: The longest you've ever used a single system?
Actually, Intel made a Pentium II 333 MHz overdrive for the socket 8. It required a BIOS upgrade on most boards.
There was another company, PowerLeap, that made Pentium III adapters for the socket 8, though with such a fast processor, the bottleneck is the system bus running at 66 MHz. Also, FPM RAM and even EDO, are quite a bit slower than SDRAM.
Since the main OS, NEXTSTEP 3.3, on that machine was released in 94 for the 486, it is quite speedy on a PII 333. KDE under Linux, on the other hand,...Leave a comment:
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Re: The longest you've ever used a single system?
Yes, the original CPU was a Pentium Pro 200. I got the motherboard in 96 (I think! I certainly had gotten the case, video card, scsi card, PSU, etc, then.) and put in the overdrive when it came out....Leave a comment:
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