Why did I say nVidia MATS?
I meant to say, use AMD Tserver/AGT to test the memory.
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TRIAC circuit
Anyone is familiar with a TRIAC circuit?
I came across this schematic, and I built it, but I can't seem to figure it out why I'm getting a low AC voltage output at the TRIAC terminals.
With 230V AC hot side at the TRIAC MT2, I measured 60V AC between MT1 and neutral side when the comparator output LED indicator is on, and 20V AC when it is off.
Same result if 230V AC hot side is at MT1, and I measured between MT2 and neutral side.
My heating element doesn't work with 60V AC. It's not even getting hot and the thermocouple amplifier output is a...1 Photo
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I've seen better design from a $2 adapter believe it or not, and yeah, I bought this awhile back for $1. Price don't change for small power adapters like this.
Yup, the core is cool and dandy but the mosfets aren't, they get very hot. I have two of these cards, with a reference blower and with a big fan in the middle. Both has the same core temp, but mosfets are not running hot on the one with the big fan.
Correct. I took the screenshots with the card running on a 1X PCIe slot mining riser.
And btw, a decent DX 9.0 card which is...Last edited by прямо; Yesterday, 07:27 PM.
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Ok, so boot into Windows with the integrated graphics so you have a display and see if Windows detects the card.
If the card is detected, then you will see an error code pertaining to the no display symptom (code 43 most likely) which is usually caused by broken connections from VRAM to GPU or from GPU to VRAM.
Run nVidia MATS tool to check which VRAM channel has that problem, and let me know.
...
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My pointless and worthless repair is a 5V 3A switched mode power supply adaptor.
What happened to it was a leaky main cap, and when I plugged, unplugged then quickly plugged back the adaptor, somehow that made the PWM chip blew itself up.
The chip is OB2358AP. It cost about the same as a brand new adaptor, which is around $1.
I replaced the chip and the main leaky cap.
It's been running fine since then.
I also have another pointless and worthless repair.
A GTX 560 SE with missing components and...6 Photos
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https://[url]https://uk.farnell.com/...> [url]https://uk.farnell.com/molex/15020-0387/ffc-fpc-cable-36-core-102mm/dp/3726572[/url]
it's only 10 cm long.
Last edited by прямо; 04-22-2024, 01:22 PM.
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I think you are confused and don't really understand what a short circuit is, and what is actually a very low resistance circuit.
The VCORE has 3 power phases, hence 3 same cascaded HS + LS mosfets and 3 same inductor coils. They should have a similar measurement.
So if one phase is different in measurement compared with the rest, then there is something wrong with it.
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The mosfets are arranged as HIGH SIDE and LOW SIDE.
HIGH SIDE mosfet Drain pin is always connected to 12V
and the Source pin is always connected to the Drain pin of the LOW SIDE mosfet and also to one pin of the inductor coil closer to the mosfet (while the other pin of the inductor coil closer to the GPU core goes directly to the GPU core) if you lifted the coils, the GPU core no longer receives VCORE and will not turn on.
LOW SIDE mosfet Source pin is always connected to GND.
To check if a mosfet is dead:
Measure its...
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Never tested a diode using a resistance mode for my entire history of repairing electronics.
I always use the diode mode, and I replace that has a voltage drop reading out of spec.
You said 3.5 ohm is bad and thus assumed the diode is not normal, but did you even check if the other similar diodes on that faulty board and as well on the working board, have the same resistance?
If 60V 1A Schottky is somewhat not enough, go up to 3A, such as Vishay SS36. It should still fit within the component footprint.
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Refer to the TDA7294 IC datasheet for a Typical Application Circuit schematic.
It should be very similar to your board because the schematic from the IC datasheet works, therefore very rarely a manufacturer using the IC would went as far as to implement a totally different circuit.
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3.5 ohm is not a short. 0 ohm is.
And why aren't you using diode mode to measure a diode?
After you came to the conclusion that the diode is faulty, did you compare it with the 2nd working unit?
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If you have 100nF, use two in series. This will give you approximately 47nF.
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Does it display a picture?
Installed as a secondary GPU, is the card detected?
If the answer is no, then check if all of the voltages are present. A warm GPU core indicates it has VCORE, but it may not have VMEM. Some manufacturers have different power sequence. Sometimes it is VCORE after VMEM, or VMEM after VCORE or both at the same time.
If all voltages are present, check the PEX reset signal (PERST) at the PCIE lanes.
If it's detected but doesn't display a picture, run MATS to check for VRAM issue.
Don't understand...
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