harp
Badcaps Veteran
Last Activity: 04-19-2025, 05:21 PM
Joined: 06-05-2022
Location: 45.2,14.4
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Make note of all other sot23 marking on board, it is not likely that is only one start with 2... common is 2A (npn), 2T (pnp)... the sharp picture of that area will also may help, and connection diagram. -
While get it to wick, use big wide flat tip which allow you to lower tip temperature due to biger surface of heat transfer. Otherwise, use preheater, heatgun, and also lower the tip temperature in order to prevent excess tip oxidation.Leave a comment:
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https://[url]https://m.youtube.com/w...arising MAGIC![url]https://m.youtube.com/watch?v=MvFf9RSJUhk[/url] EEVblog 1458 - Microscope Polarising MAGIC!Leave a comment:
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No, your technique is no good. When you work with ic who has difficult label to read, you must adjust position/angle of your light and/or camera objective. It is best to use handheld battery powered lamp for that use, and orbit arround ic while looking to cammera. You try to not get reflection at first place. In one spot you will see much more contrast, and for that point you get sharp picture... in first picture is something visable about label, so it cant be worse after cleaning if you find the right spot. It is usefull to turn off ringlight or other light source on camera to that purpose. After...Leave a comment:
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Cleaning with ipa, adjust light position and angle to best contrast, focus... what mark/char do you see?Leave a comment:
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On pcb under bga9 ic, have you short on some pins, shorted output? Check area arround hdmi, it look like component on data lines have hole in it... maybe some lightening strike product......
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May be some type of sense resistor, but probably the self-desctructive fuse with heater....
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Wow, whole history in one sentences, briliant! Thank you, its all clear now... core i3,5,7 or FMx socket...Leave a comment:
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Thank you very much for answer. Please can you explain me just one more thing: how can be determined if some mb with vga onboard port need cpu with integrated graphics to output (or something other go wrong), is there some procedure, steps or date code, etc from where motherboard are produced uncompleted? This topic is very new to me, trying understand how to aproach no vga output problem if there is "no problem".Leave a comment:
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I make some test with and without external graphics card and logicaly conclude that is everything just what have to be (not display on mb onboard vga and dvi port), so please, can you explain me briefly how is that supposed to work, is that ports use resource from external pcie graphics card, or only from cpu with integrated graphics in it?Leave a comment:
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00660F01 ?...
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new ga-f2a68hm-ds2 motherboard with no vga output
Just to ask here... I am from era where every port is working initialy... in now days I see there is graphics depend of version of cpu... So, I have desktop mb ga-f2a68hm-ds2 with no graphics on onboard vga port... with external graphics card produce picture, is ok. I found that might be because my cpu athlon x4 845 has no "graphics in it", but from mb datasheet is mentioned that have onboard graphics... So, is there some sign, where or what to look, to know if the mb vga output is faulty, or simply disabled by cpu inability? Proper confused......
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Here... some information... [url]https://engraverscafe.com/threads/stereo-microscopes-to-buy-and-to-avoid.3451/[/url]https://Here... some information...[...id.3451/[/url]Leave a comment:
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Check with test motherboard as load. I have same behaveour and befre to search problem, eliminate posibility... See end of video... [url]http://www.youtube.com/watch?v=d7jXHcYf9wk[/url]https://Check with test motherboard ...XHcYf9wk[/url]Leave a comment:
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The bridge rectifier, transistors and mosfet also has correct reading, no shorted? Then check electrolitic capacitor for short... there is some path that drow current a lot...Leave a comment:
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Check with dmm all semiconductor for short, dont just replace fuse... marking on resistors also must be intouch, clear......
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In one my testing of unwanted connection of various os and device, I use some stanalone fully isolated laptop like wifi hotspot with wireshark monitoring........... [url]http://www.youtube.com/watch?v=oi2VOkPITqQ[/url] Maybe you can do same, to disconnect tested computer and via usb wificard conect to wireshark hotspot... you give very little information about what number of computer is in network and what information (ip, address...) you collect from isp... the program in case of detection of network connectivity usualy send request to try connect to desired server...In one my testing of unwantedLeave a comment:
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" You can find much contradictory information regarding this topic. Hard drive manufacturers themselves don't like to talk about it. But generally, hard drives are much more resistant to big magnets than expected. The hard drive coating usually provides a high level of coercivity. This means you would have to bring a very large magnet very close to a hard drive in order to delete files. As long as you don't unscrew the top cover of the hard drive, you won't be able to get close enough. " .................. [url]https://m.youtube.com/watch?v=G3eURKwqbN8[/url]" You can find much contradictoryLeave a comment:
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"Generally the main issue I have is board deformation, because the bottom heater is way too small and hard to control".................. I see some system with rather small heating area... [url]https://m.youtube.com/watch?v=BqmlVT5zYvQ[/url] ... it claim to can lift any common size bga. Regard deforming, I think that is from moisture inside pcb (even plastic absorb moist over time) and that large board must be low heat (say 100 C) threated a hours and hours ago before start bga soldering work.https://"Generally the main issue I ... heater is wayLeave a comment:
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"it makes a continuous, very fast clicking sound".................. if is about 3 or 4 times per seconds, that may be represent a refresh rate of reading, and I guess some short maybe, if LCD readings go off simultaneously with clicking... Check whats going on processor supply voltages, is stable, or follow clicking?Leave a comment:
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