What is resistance on 3.3v rail? If he managed to hold 3.0v it is relative high... after you disconect psu from mainboard, check all diodes and major transistors, you may want to inject some current into 3v3 rail to see where is problem.
Also, advice to clean pcb, check and resolder all THT pads, especialy over main transformer and power semiconductors, looks crack or cold joined....
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Ask google...
UP9510P Datasheet. Part #: UP9510PQAG. Datasheet: 374Kb/19P. Manufacturer: uPI Group Inc.. Description: 3/2/1-Phase Synchronous-Rectified Buck Controller.
Part #: NCP45491. Download. File Size: 153Kbytes. Page: 10 Pages. Description: 26V, 4-Channel Voltage Bus and 4-Channel High-Side Current Shunt Monitor.
So UP9510P is driver.
Video is about fast searching (with copper brush) of connection on burried track over pcb. I show you to see principes of finding connection between two point, as you ask.
MX22 has Hz...
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So, gpu has 0.8 ohm, and your dmm probes and leads about 0.2 ohm...
In this case, 0.2 ohm has to be concider like a short, and 0.8 ohm is gpu working resistance. Anything below 0.8 ohm is suspicious if is on power or signal rail.
Do not inject anything in 0.8 ohm rail.
You ar fascinating with shorts... but, if the gate signal is missing, or fluctating, or pulled aside, it may act like short while is power on. Therefore, driver ic act as supervisor and shutdown rail.
Generaly, signal path is cheking with dmm in beeping mode while one (referent) probe is on...Last edited by harp; 04-20-2024, 06:58 AM.
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So the card is working, outputing pictures, without two mosfet?
Have you tested these mosfet out from circuit? Both shorted?
Have you check path from driver ic to gate? With dmm can you measure frequency on gate? Or on driver ic outputs?
Maybe is driver ic fault...
It is not helpfull for troubleshooting if you desolder bounch of crucial components... now, you must first confirm that is everithing back again in working condition....
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Remove board from houseing, remove all heatsink and all removable elements, connectors, wire... then wrap arround whole board with thick cardboard hard paper (from cookies) to reduce loosing heat by air moving.
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UFPI Red supports eMMC in 8-bit mode.
Licenses activated in this programmer by default:
1-Wire
EEPROM I2C
EEPROM SPI
EEPROM Microwire (3-Wire)
SPI Flash
UART
SD/eMMC
NOR
NAND
Serial NAND
OneNAND
BDM
JTAG
Mount chip activation, mount file activation and LOGGER module activation, if necessary, are purchased separately.
Details of all included UFPI modules and licenses can be read here.​
[url]https://mslw.com/ufpi/licenses/[/url]UFPI Red supports eMMC in 8-bit mode.
...
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Logging keyboard/trackpad activities system utility
have a hp probook 450 G1 laptop with win10 and have some problems with keyboard/tuchpad related to temperature, humidity or condensation.
It behave that when poweron in cold room starts randomly glitches like a open/close search window tab, most time stay on screen opened and mouse cursor run totaly on left border, or be locked on place, occasionaly let me to pass movement to go. Movement is hard or partialy disabled, like he has already got (has filled with) command what to do... it is hard to describe.
After a while, few minutes, everything is ok. I suspect a trackpad because...
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No, I am not working with that... and dont know what is doing robot arm (and why) while going heating is applied.
I appreciate any help naturaly, but just not find any reference about method you mentioned to understand principle of that technique.
To me it is not adequate to just hear new information, I always tend to understand indepth about it, maybe I dont ever needed or use it but like to can say to know it for sure, not only to have hear from where, NHF. Anyway I am not sure what is concerned like problem and how to achieve to fix it with this method?
I am interesting...
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I am interesting for origin of this method with weight on top... while watching a lots of video, never seen this technique for bga chip?...
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Read this... maybe help
[URL]http://www.hallikainen.org/hzb-12b/[/URL]
Antarctic Star HZB-12B Portable Automatic Ice Maker Repair
On attach are some troubleshooting from device manual but I dot understand wery well...https://Read this... maybe help<br /...d wery well...Read this... maybe help
[URL]http://www.hallikainen.org/hzb-12b/[/URL]
Antarctic Star...Last edited by harp; 03-24-2024, 04:13 PM.
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Have you replaced relay?
Whats is input sensors, and what is outputs? I see for motor, valve, fan... whats else?
Is voltage on board ok? Optocoupers ok on both side?
Uln2003 is some driver I think for motor, SOC is microcontroler with firmware, do not mess around with it if it is not clear his fault.
What ir led? Maybe there is must be filled water in order to work.
Traceback what trigger red led, maybe some switch or so... search for missing signal, I dont know...Last edited by harp; 03-23-2024, 03:01 PM.
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Check this method for saveing from wear soic8 clamp before first use... you must understand principe why is geting destroyed, and do upgrade in your aproach
[url]https://m.youtube.com/watch?v=SrAzVT1OKEA[/url]
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/equipment-usage-soldering-techniques-and-reviews/104714-what-for-this-sop8-apparatus[/url]https://Check this method for savein...zVT1OKEA[/url]
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Check this, nowadays are lots of crap optics...
[url]https://engraverscafe.com/threads/stereo-microscopes-to-buy-and-to-avoid.3451/[/url]
[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/equipment-usage-soldering-techniques-and-reviews/100483-looking-to-buy-a-microscope[/url]https://Check this, nowadays are lot...ronics-theory/
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If I am not wrong, Sorin just make video with simmilar printer
[url]https://m.youtube.com/watch?v=ufwOl-YBplk[/url]
Just idea for you, why not upload here working firmware anyway to have it if is needed in future... https://If I am not wrong, Sorin jus...ture... :wink:If I am not wrong, Sorin just make video with simmilar printer
[url]https://m.youtube.com/watch?v=ufwOl-YBplk[/url]
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It look like some sort of ptc resisor (self regulated temperature point)
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Carefuly with acetone, it has known noticable health hazard throug skin contact or vapour to internal organs, like acumulated toxic properties.
Also, it melt some plastics and coating using in electronics part or housing of device.
It is agresive to much, I dont recommend using it in general for cleaning, only special purposes.
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Use only 99% ipa or higher dehidrated alcohol for electronic
Avoid to pour in it fine optics or mehanics, like camera, speaker, microphone, sensors etc... the this things must be removed before cleaning or protect against liquid penetrate.
Anything thats it disolved in it after cleaning must be quickly soaked from pcb first with towel, then dried, not only left on pcb to dry...
Cleaning proces repeat 2-3 times to ensure to remove dirt from pcb to towel
Alcohol is great for disolving rossin from flux, and help with removing water, but it is not so good for cleaning...Last edited by harp; 03-16-2024, 02:45 PM.
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Yes, it is good start...
I also suggest, regardles to your intro story, to start collecting free ewaste pcb stuff, so to have random free component near you available in stock.
Also, learn and unerstand how smps work, stages/section, what and how to check, because the most problem is located on power supply board.
Gather or make basic test&work equipment and learn in depth useing it properly.
Next learn your prefered stuff, like tv, how they function, sequences, signals, troubleshooting... say
[URL]https://m.youtube.com/@RepairAllTV/videos[/URL]
...Last edited by harp; 03-08-2024, 10:31 AM.
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