Yes that's the board and those are my pictures
Nothing is getting hot. I'll check regulators again but there is not much on the board. The only regulators are for RAM, VCORE and IO. IO and VCore are ok. I can check the Ram one but I'm not testing with RAM for now (yes, I also have tested with it).
Where do you see the RAM size thing? I don't see it on the jumper sheet/manual.
Yes, I appreciate Socket 7 is a bit more complex, but that's why I've posted here I think I've depleted the "basic" options (reset line, voltages, clock) and I'd like...
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Thanks.
The CPU should do something without RAM but there is zero activity. No post codes, no beeps, no activity whatsoever on address/data lines. It's like the CPU is in reset mode.
There is really not much on that board. I haven't checked the 3.3V at the RAM to be fair but I am testing without RAM for the time being. I can definitely check that all the other ICs on the board are powered - but I would still expect to see some pulses coming from the CPU when the RESET line is disabled, would you agree?
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Acer V58 Vintage Socket 7 Motherboard
Hi all,
I'm trying to troubleshoot a vintage Acer V58 motherboard, ALI chipset 1541/1543. Symptoms are: it's very dead.
The CPU in question, a plain Pentium 200, it works on a different board. I have checked the voltages, the clock and the reset lines. All checks out.
However I have ZERO activity on the CPU data/address lines. It's like the CPU is told NOT to start but I cannot figure out how. A post-card shows "--" and there is of course no activity on the BIOS address/data lines.
I checked the HLDA (Hold Acknowledge) line which could indicate...
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Interesting pointers, thanks. I am familiar with the spark you get when you connect equipment which is powered by non-earthed power supplies.
So if I understand this correctly, that voltage is referenced to the neutral - which in turns is referenced to ground at some point - and the culprit is the Y-cap which is in between primary and secondary. Can someone remind me why that cap is there?
If the supply was NOT referenced to anything - i.e. through an isolation transformer - I wouldn't be able to read 80V at the tip, I would read 0V - am I correct?
The fact that...
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I checked current between tip and ground and I am reading 0.000. I suspect I would read 0V if I grounded the tip, I'll try.
a few mA is ok. It's the 80V that kind of concerns me....
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Yes, I discovered the leak on the T3A but for me that is unacceptable. But that is a different thing as you can light up LEDs and I can measure a CURRENT. I can make a speaker sound. This USB iron won't do that.
All my three PD supplies don't have a ground pin - I guess this is common. That means - please correct me if I am mistaken - that whatever voltage I am reading at the tip won't go anywhere as it's like the iron is behind an isolation transformer: I can touch the live of MAINS after an isolation transformer and I won't get shocked.
Now, my question is: is this...
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I read 0.000A so that should be safe? Even for sensitive devices?
My question is: is that unavoidable when using USB power?
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I got it on Ebay from someone who claims to be the UK distributor - they showed an AMTECH business card and I believe Amtech shows their name on their website....
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Kaiweets USB soldering iron
Hi all,
I am testing a USB powered soldering iron. It's made by Kaiweets but I believe it's also sold under other names.
As a standard test, I checked whether there was any voltage leak from the tip - that said the thing runs on USB-C power delivery so am I correct that the whole unit is floating and not grounded? If I check, I measure 90V at the tip but I have a feeling that that is not relevant? Maybe caused by that capacitor between primary and secondary inside the PSU? I do not see current flowing at all.
In other words, do you think it's expected and...
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It doesn't burn, it gets a bit too thick and darkens a bit - the guy of the video is a sort of wizard, I don't know how he can do what he does so I take that suggestion seriously! From his (and others) videos I see that their flux stays much more fluid and clear than mine....
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My iron is usually around 360. With tiny tips I might increase the temp as there is very little thermal mass at the tip.
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Non darkening Flux?
Hi all,
I was watching a video from NorthWest Repair (The guy there is just doing such incredible repairs) and while he was fixing a bunch of pads on a GPU PCB, I saw this
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I've been trying to fix some broken traces on a PS3 CPU for a while but one major issue I'm seeing with my AMTECH flux is that it gets tacky and dark very quickly and then it's a pain to remove and replace.
In the video Tony (I think it's his...
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harp[USER="414449"]harp[/USER]
You are my new hero Your drawing skills are impressive!
I think that is what I'll try to do. I'll keep you posted! Thanks!
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Best tool to place electrolytic SMD caps on a board
HI all,
I am working on some boards where all 100+ SMD caps have to be replaced (yes, they actually went bad!). I found a workflow to remove them comfortably (two irons, pre-heater and extra hot air for larger ones on ground planes).
When it comes to soldering them back, I add solder to one pad and then I use a plastic tweezer to keep them in the right place while I solder that leg.
The tweezer works - but I was wondering if there is a more "dedicated" tool or whether someone has a better idea. If it was for a bunch of caps then who cares. But because...
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My T3A is in a box. I wasted enough time with it. Happy to leave the excitement to others
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It could be.
When I discovered the issue I asked Aixun whether my unit was genuine and they did confirm it is. So if it's a reject, it's an Aixun official reject
Either way, it doesn't look good for Aixun....
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What I discovered has been since confirmed by others so it's definitely not a fault with my station. The fact that later FW is "mitigating/hiding" the issue seems to confirm that they are well aware. NWR's video linked above is another real life demonstration that this is real.
Aixun only told me to wait until the tech department looked into the issue - never heard from them since. I suppose my video-reviews must have upset them (they were aware I was reviewing the station when I contacted them).
There are several theories behind this issue and obviously they...
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