Re: MSI-7207 (K8NGM2-L) version 1.0
Off To buy a soldering station.
Off To buy a soldering station.
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Re: MSI-7207 (K8NGM2-L) version 1.0
I finally have fixed one of my MS-7207 motherboards. I first replaced the 5 caps by the cpu. Mine were the KZG series. After I replaced them , I checked with cap meter and blue esr meter. All checked good, but board still booted every other time. So I ended up replacing all the caps with panny's (that weren't already panny's. Still booted every other time. I had tried 2 pci-e video cards , but could never get them to be recognized. I even bought the one emachines recommended. So I bought a hot air reflow station on ebay (Kendall 852d+ for $86) and reflowed the video chip. Same results. So I reflowed the North Bridge and it worked. I did this yesterday and it is working like it should. Before if I went into bios and hit save and exit, it would not do anything. Stuck right there. Had to power down with button and restart twice to get it back up. If I hit restart computer after updates or anytime I wanted to restart, it would not reboot. But would the second time. Now it is working correctly. I restarted and started from off 10 times last night with a nice boot every time. I am on it this morning as I am going to use it today to keep it in check. I will restart and shutdown several times today. I have the same board on another emachine doing the exact same thing, so after a couple days of using this one, then I will only do a reflow of the northbridge to see if that is all the other board needs. I have done nothing to the other board yet as I figured I wanted to find the problem with one first. So , anyway, before you give up on these boards , try to reflow the northbridge if it has boot problems. I always thought something was wrong with video.Comment
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Re: MSI-7207 (K8NGM2-L) version 1.0
I let it run all day yesterday with 15 restarts and a couple F2 into bios , which when you hit F10 and saved , it would be froze on the screen. Everything worked great after the northbridge. Will do the 2nd board today (northbridge only unless I see some bad caps orsomething).Comment
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Re: MSI-7207 (K8NGM2-L) version 1.0
Well, this was the version 2 board. The other was a version 1. Took the board out, saw no physical damge to caps or anything, so I reflowed the NorthBridge. No Joy. Still boot every other time (perfect though). So I replaced 7 G-Luxon caps and tried again. Same thing. Reflowed the video chip and it has booted 25 times today in a row and comes out of bios correctly. So this one was the video and the other was the northbridge. Guess it even could have been both had to be done. Working great, so far though.Comment
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Re: MSI-7207 (K8NGM2-L) version 1.0
I found this model on ebay. It's around 86 bucks, do you think this is a good unit?
http://cgi.ebay.com/SMD-Rework-Solde...item4aa8e321f9Comment
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Re: MSI-7207 (K8NGM2-L) version 1.0
That is the model I bought,, except mine is a Kendall 852d+ that looks exactly like that except mine has red lights. I paid 86.95 with free shipping. I just looked and they don't have anymore of that one, but has an 898d for $99 shipped from NY. Looks to be the newer model. Same attachments as the other.Comment
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Hi,
I am repairing a ups which doesn't turn on ,it has the following ICs:
SG3525 used to drive inverter mosfets.
couple of uc3483, one for the power supply and another to drive a big mosfet at the output stage(i think the technique is called boost)
A LM358 and TL074 for control mechanism and of course the uController.
The SG3525 is shutting down every time the ups is turned on.
I want your help to know the function of LM358 and TL074 in the system.
I reverse engineered the LM358 circuit and i think that one of the block(A) is used for battery level... -
Hi friends of electronics
What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.
The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.
Please help me fix this circuit.
(the datasheet of the IC: https://pdf.datasheet.live/28... -
Hello friends,
Looking for some guidance here. The RAM voltage circuit on this motherboard keeps burning out PU301 which is a RT8231AGQW. Copy of the board with the burnt chip attached with some voltage measurements and copy of the schematics also included.
I think I've checked almost every component in the circuit, but when I change the RT8231, the laptop starts I have 1.2V on the inductor for about 10 seconds and then the RT8231 goes south and no more voltage on the inductor. All other voltages on the laptop are good, this is the only one conking out for a reason I... -
Hello.
I have seen a short circuit tester made with 3 * 9V batteries, a voltage limiter component and a resistor connected to the probes of a multimeter.
The theory is that the meter becomes sensitive enough to read very low resistances and the lowest resistance to ground on a circuit is likely to be a short circuit in that area.
Link
The Amazing $1 Short Finder Upgraded! Convert ... - YouTube
https://www.youtube.com/watch?v=0eixDdCpiO4
My multimeter isn't normally sensitive to very small resistance, but when I put a 1 mega ohm resistor... -
Hello. MSI B250 Gaming M3 board, short-circuit on the power supply. Found a problematic mosfet VQ1
(N-PK616BA_PDFN8-HF) soldered it out - short circuit is gone. I replaced VQ1 + VQ5 (N-PK632BA_PDFN8-HF). VQ1 was replaced with PK618. After starting attempt VQ1 is lit again. What can be the problem? In the driver?
Schematic and Boardview here
...04-04-2025, 03:57 PM
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