Recent content by Lazzer408

He built a new PC around this card. He said it worked until he enabled XMP. Saved and exited then got up to use the restroom. When he got back the screen was dead. Never worked again. He even went as far as returning his CPU, mobo, and memory. Still nothing. Hasn't played a single game. I don't...

There's a model sticker on it. The serial number sticker from what I can tell is normally located just above the PCIe edge but is missing. No indication it was ever there.

Robeytech was the person who did the promotion on Twitch. My friend asked him to help but Robeytech just blocked him and washed his has of the situation. Robeytech was also the one that said it came from AMD so deal with them for RMA. The card has no serial number. That's the other issue with...

Yes dual bios. Neither works.

I've read a lot of people are having issues with the RX5700 cards. This one is a no post situation. BIOS hangs at code b2, initializing the GPU's firmware, and hangs there. If I boot off the onboard, the 5700 does show up in device manager. Plugging in a monitor afterwards does nothing. No...

A friend won a Powercolor RX5700 and it's DOA. Powercolor says contact AMD because they provided it as a promotional item. AMD says contact Powercolor because it's their card. Any advice where to go from here?

It's going to be something along these lines. Not sure how it will work with the PWM signal being 5v but a low/hi signal driving this circuit will give you a low/hi out. Choose a Q1 large enough to drive your load, Choose R2 to drive enough current into Q1's base. Q2 should be large enough to...

High side switching via. MOSFET will require gate drive >12v. Use a BJT transistor. Because it's switched mode, losses are minimal. Typically (.6V*A)*PWM=dissipation. If you had 3 amps worth of fans (a lot), and PWM is 100%, you will only have ~1.8w of heat to dissipate from the transistor. I'm...

All of that had been mentioned in the thread.

The capacitor should be placed in parallel with your supply voltage. Duty cycle (pulse width) is controlled by the motherboard. If you can't adjust it in the BIOS then there's nothing you can do about it.

The PWM frequency is a function of the motherboard. All the board does is ground the PWM pin at varying widths. If you don't have complete control over the fan curves in your BIOS, this circuit may not work for you. The "correct" way to control a fan (using Intel's PWM spec) is a more...

Put your meter on AC and measure that charger. Read anything? If so, that's the ripple in the DC caused by the chargers lack of filtering (they don't need it). Next, place a capacitor in parallel with the charger and measure the DC voltage. Is it higher? If so, that's the peak DC voltage coming...

I think it's in quotes because we have no idea of knowing what type of charger it is. If it's a trickle charger for lead acid batteries, then it's likely much higher then 12v and it's not DC either. If the fans run full speed with the PWM unplugged, your gate drive is ok. What happens with you...

He mentioned in #79 that he tried the charger... "with a few Deltas and San Aces, 8 fans total, they all seemed to run full bore with no PWM connected". I think it's in his computer now.

Not a very good component but RDS(on) at 4v is .07 ohms so you 4.1v is plenty of gate voltage. NTE parts are junk (for future reference) but not the cause of your problem. The switching frequency is a function of the motherboard and should be around ~20khz. What do the fans do if you pull the...