harp
Badcaps Veteran
Last Activity: Today, 12:58 PM
Joined: 06-05-2022
Location: 45.2,14.4
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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... -
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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Nothing specific... I just wonder if the present of rom ic has any impact on data safety, if is desired to save all other hardware resource of hdd.......... we can see that method removing or wipeing rom ic it not safe, beside some claims that rom ic hold "esenciall and unique" data required to function...Leave a comment:
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Yes, indeed, thank you!Leave a comment:
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is it possible restore data from the hdd with removed rom ic?
is it possible restore data from the hdd with removed rom ic so, is there any way, theory or practice, to restore or calculate missing data in flashrom ic from actual data stored on disk platers? In other words, is data on disc somehow reachable, recover without original rom firmware, using exactly donor board, special lab hardware, etc? -
Maybe some type of switching power supply... I see coil on the right......
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Or... you can carefully open it, cleaning, lubricating... the particles on magnet inside stator, you catch and absorb with sticky tape... use grease instead oil................. [url]http://www.youtube.com/watch?v=STRnqIjvanU[/url]https://Or... you can carefully open...nqIjvanU[/url]Leave a comment:
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Green green mean 55, maybe 5.5V? Aplication circuit maybe help......
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But the funny thing is that none of the listed codes are like that on the display..................... it is self-test no 5, defrost errorLeave a comment:
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if i touch the corner instead of the side center.................. in videos of northwestrepair he noted that bga ic must be gently touched on side center, and not touched on corner.Leave a comment:
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Looks like low value capacitor (pF), you have it again on right side of photo also... if it is between power rail and ground. Some measuring device have trouble while measure that low capacitance out of circuit, and in circuit measurement has no sence at all. If it is on some power rail, then that shape and color may be a fuse, or blown fuse.Leave a comment:
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why in the image there are 14 pins while mine has 8 pins. And I have the impression that none of them are connected to ground. ?............... it is only different packages, same device, your chip has ground plane soldered on pcb...
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Then, just use more flux...Leave a comment:
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My bet is that is specialized chip ic with integrated triac inside and pwm controller of constant current or so, what is setup via external resistor of 47 ohms... I see simillar chip on some led lights, and messing arround with settup resistor can control power and heat disipation, so, longer life......
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This "auto-corect" is stupid, i wrote similary but for pin nr.90... wtf node nr.90?!?...
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