Learn Electronics Repair #13 Short Circuit Tracing Techniques (8800GT Part 5)
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- čas přidán 29. 03. 2021
- Learn Electronics Repair #13
Short Circuit Tracing Techniques Part 1
This is an important one. In this video we look at various methods to trace short circuits.
If you would like to watch Short Circuit Tracing Techniques Part 2 you can view it here
• Learn Electronics Repa...
If you have been following the repair of the 8800GT Graphics cards you can find the other videos here
Watch part 1 here: • Learn Electronics Repa...
Watch part 2 here: • Learn Electronics Repa...
Watch part 3 here: • Learn Electronics Repa...
Watch part 4 here: • Learn Electronics Repa...
Watch part 6 here: • Learn Electronics Repa...
Watch part 7 here: • Learn Electronics Repa...
Watch part 8 here : • Learn Electronics Repa...
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Thank you
Richard
Heya, very nice video with nice dept going trouble shooting
Great video. I usually highlight the codes on IC's/transistors by covering it in a bit of thermal compound and wiping it away, leaving the code highlighted. Worked every time. Better to clean any flux on the chip with alcohol first too
there is another trike to see the numbers rub a bit of white tipex over the chip it can make it visible
great video
Thanks! I still have one more video to make on these 8800GT cards as I ordered a new GPU for the one that I successfully removed the old GPU. When it arrives I will be trying to replace it and post the results, regardless of whether it is successful or not
The easiest way to found a short is just to take a bench power supply set at 1V with current limit at 1A feed the shorted node with it and measure the voltage across the components on this node, the one giving the lowest reading is the faulty component.
Yes that is another way. I've made a whole video using that method. Also did you check out this one?
czcams.com/video/P_2GGNr4q1s/video.html
Hi Richard - I havn't seen the other videos after this - so don't know if you came up with this - but on the issue of detecting if a part gets hot after putting volts through it, I wonder if a top mounted flir camera (like they use in ghost hunting) would show different colours on the part. Maybe / maybe not - just an idea. :)
Awesome video, did you end up taking the GPU chip off the board to see if it was actually shorting?
Glad you liked it! Yeah I did remove the GPU next on this video
czcams.com/video/1bA4rxKxlqk/video.html
And also tried to reflow the other GPU on this one
czcams.com/video/CWqctQmx6R0/video.html
I now have a new replacement GPU on the way, to see if I can fix one of the cards.
Why did you not Put More Amps into The Board with shorted GPU?
If you inject higher Voltage into the GPU than it was designed for, it will be damaged. He also explains this at 44:30
Thank you for your videos, I learned a lot from you. However in this case I don't understand why the GPU is the shorted component, can you explain? Should the voltage drop be much higher so reading much less voltage on that capacitor next to the GPU? Thank you.
@bslay4r
This is an old video so I need to review what I was doing - can you dgive me a time stamp of the confusing part and I will take a look.
@@LearnElectronicsRepair it starts around 50:00 .
Thanks. I learned a lot from you. At 42: 47 ( if i dont have esr meter) i can figure out with a better multimeter witch side has lover resistance? And what happens if I send craft to the other side of the component?
You can find shorts like these with a resistance meter that can read milli-ohms or micro-ohms. This would be a four wire meter - normal two lead multimeters can not read resistances this low due to lead resistance amongst other things. I'll get one sometime soon and try it.
Try this out
czcams.com/video/P_2GGNr4q1s/video.html
I don’t even know what you’re testing with the volt meter, the different numbers you’re calling out, or why you’re testing the spots you’re testing. Is there a video I can watch explaining on what to test and why to test it and what we’re looking for? A more in depth video. I’m new to this, thank you for understanding.
May be it's one of the capacitors on the GPU that went short. It's worth trying to desolder them and see if the short goes away. (Not sure how easy that is).
Actually a capacitor that size would short and turn into essentially a small wire which creates heat. A large wire essentially is a no heat short.