I need to find out what value this resistor is. Having a hard time finding out. Replaced a bad main cap, a power mosfet and a smd resistor. This resistor measures .02ohm.
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Re: Thermaltake TR2 750w Need help with resistor value
it's fine i suspect.
the first 2 bands are black,red
that's 0,2 -
Re: Thermaltake TR2 750w Need help with resistor value
Why all the other bands then?Comment
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Re: Thermaltake TR2 750w Need help with resistor value
tolerance, temperature coeficient etc.Comment
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Re: Thermaltake TR2 750w Need help with resistor value
Black = 0
Red = 2
Green = 5
Gold X 0.1
Green = .5%
I don't know why they used black as the first band because all calculators just ignore the zero.
That calculates out to 2.5 ohms which is likely wrong, what you measured is likely correct, .025 ohmsLast edited by R_J; 07-06-2017, 12:50 PM.Comment
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Re: Thermaltake TR2 750w Need help with resistor value
If it reads that low on resistance, it is more than likely fine. Resistors go open-circuit or high resistance when they go bad.Comment
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Re: Thermaltake TR2 750w Need help with resistor value
Thanks for the help. Does anyone know where you can get schematics for computer power supplies?Comment
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Re: Thermaltake TR2 750w Need help with resistor value
You may or may not be able to find one for your PSU. Best way to troubleshoot is to note down what the symptoms of the PSU are, then start from there.
If the PSU appears completely dead (i.e. won't power a PC and won't start when you short the PS_ON wire to ground), start with the 5VSB rail. When plugged in, there should be about 5V on the 5VSB wire relative to ground. If you don't have 5V there, nothing else in the PSU will work, so that's where you start troubleshooting by testing components in the 5VSB circuit.
If the 5VSB is present but the PSU refuses to start, it can be a number of things. So here, the troubleshooting will depend on the symptoms your PSU has - i.e. if the fans twitch, that means there is either a short-circuit somewhere, or one or more of the rails is not regulating properly. If no symptoms (completely dead PSU, but 5VSB present), then check the primary-side switch devices, primary-side controller voltage, and secondary-side PS_ON signal generation circuit. Also APFC components, if the PSU has APFC.Last edited by momaka; 07-07-2017, 08:40 AM.Comment
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Re: Thermaltake TR2 750w Need help with resistor value
there is a russian site with lots of psu schems
try searching with yandexComment
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Hi
I am trying to repair an ancient Dell 2209WA Monitor which suddenly shut off with a pop sound. On investigation found that one of the fusible resistors had blown. Further investigation identified multiple components as faulty because of which the fusible resistor blew. Please refer the attached circuit diagram showing the components that were found to be damaged.
1. FR950 - blown fusible resistor - 0.2 Ohm 1W
2. Q950 - shorted Q950 MOSFET - 650V 10A N Channel Mosfet
3. R835 - Blown Resistor - 20KOhm SMD resistor
4. D930 - Shorted Schottkey Diode... -
Hi to all forum members,
Got this faulty 350 watt atx psu dirt cheap from a local online seller as i am keen to use it as a learning tool to repair faulty power supply.
The faulty part is quite obvious from the burn area near the 16pin KA7500 BD pwm. The fuse is still intact with good continuity.
Upon power on ac, there is 5vdc standby power on cathode of diode D14 and about 10vdc on cathode of diode D13.(This should be the aux power to generate the 12v and 5v rail.)
Initially i replace the two burned resistors near my marked red arrow to 200 ohm resistor... -
I am curious if a 0402 resistor could go from 43 ohm to 0. In electronics class and my experience a resistor can degrade and gain resistance all the way up to not being able to conduct at all. I have never heard of a resistor decreasing in resistance and becoming 0 ohm or a dead short… that's not the direction they fail… or so I thought.
I was attempting to remove a wson8 chip on an iMac motherboard and it required a lot of heat, on one side of the chip were 3 0402 resistors that were very close. I popped the chip out unintentionally out of the tweezers and sent those resistors... -
The resistor on this waterpik blew. I changed it with the a similar spec 47ohm 2 watt yageo resistor but it still keeps blowing the resistor. Checking with the multimeter the motor, capacitor, diodes, and thermal fuse all checked normal. Will a higher ohm resistor work better? What ohm resistor will work better to repair this waterpik? This video is showing the repair with a 56 ohm resistor https://www.youtube.com/watch?v=_J7_rV7ui1Y -
Hi, 1 resistor is blow and it is connected to the biggest capacitor. Any ideas what value it should be replaced with?...
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