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I need to look carefully at the video multiple times since it is not english and need to figure out what is saying in the subtitles.
I have access to 3-4 DMM, my best ones are ASITA MD591 (daily driver) and Metrix MX22 (backup). Both of them are not state of the art but is all I have and can afford at the moment. Thanks....
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Also wanted to add this, I don't know how I missed it, measuring the pads of the four Capacitors I've removed ( C77, C80, C78, C79 ), I get very low resistance to ground. I get 0.1-0.2Ohms on the negative pad (right side, facing the GPU die) and I get 0.9-1 ohm on the left pad ( left side, facing the video output connectors). Is this normal? Thanks.
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Hi!!
So the card is working, outputing pictures, without two mosfet?
- Yes, the card is working fine without two mosfets. It loads drivers correctly and can run 3D software. Tested briefly of course to avoid stressing the working Mosfets.
Have you tested these mosfet out from circuit? Both shorted?
- I have tested them, I wasn't sure if they were shorted, ordered new ones from Aliexpress just in case, but the problem persists.
Have you check path from driver ic to gate? With dmm can you measure frequency on gate? Or on driver ic...
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Thank you for your information
What you are saying makes sense in my measurements.
I measured all Mosfets (the 4x ones that are currently on the board and the pads of the two removed mosfets) and there is no short (Source - Drain, Drain - Gate, Gate - Source)
PS, I didn't want to remove the crystal oscillator, it just fell off when applying heat on the back of the card during removal of the Coils
At this point I'm still not sure where my short is. When connecting the coil pads (using a tweezer), thus simulating the coil is still there, I get short circuit...
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I highly appreciate your time for helping me
Here are the measurements you asked:
The two mosfets North:
On the left: Source: 10.22 Megaohm and slowly decreasing - Gate: OL (open) - Drain: 5.6 Megaohm and slowly decreasing
On the right: Source: 0.1 Ohm (short) - Gate: 18.8 Megaohm and slowly decreasing - Drain: 10.35 Megaohm and slowly decreasing
The two mosfets South:
On the left: Source: 12.22 K-ohm - Gate: 25 K-Ohm - Drain: 14 Megaohm and slowly decreasing
On the right: Source: 0.1 Ohm (short) - Gate: 23.63...
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Help me find the short circuit on this WORKING Nvidia GTX1650
Hi all,
Recently picked up this GTX1650 at a local flea market for a low price and wanted to use it on my secondary PC. I first tested the card and saw the fan spin for a split second and then nothing. Immediately I thought of a short circuit. Disassembled and found a shorted SMD capacitor, injected voltage into it (1V/4A) and two Mosfets got hot immediately (QN3103 & QN3107). Desoldered these Mosfets and the card turned back to life.
Bought replacements from Aliexpress and replaced them afterwards. Tried the card but still the saw the fan spin for a split second...
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