Author Topic: Plz help identify burnout resistor on thrustmaster t500 pcb  (Read 1487 times)

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Offline freyzTopic starter

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Plz help identify burnout resistor on thrustmaster t500 pcb
« on: February 03, 2021, 11:18:47 pm »
I am trying to save my Thrustmaster racing wheel after its motor stopped responding. I found a burned resistor on the mainboard that seemingly caused the issue. However, I don't understand its function and its marks all fade out.  1164776-1
According to multimeter measurement, the resistor is between 24V positive and H-bridge motor controller. I don't see why such resistor is needed since both motor and MOSFET are rated for 24V. When I short the resistor the motor did rotate and work just fine. So my question is, what is this resistor and do I really need to replace it?
This is the rough schematic about the resistor.
« Last Edit: February 04, 2021, 01:01:24 am by freyz »
 

Offline techneut

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Re: Plz help identify burnout resistor on motor controller
« Reply #1 on: February 03, 2021, 11:32:44 pm »
It is possible that the resistor is used for current sensing. It will then be around 1 Ohm or less.
 
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Offline freyzTopic starter

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Re: Plz help identify burnout resistor on motor controller
« Reply #2 on: February 03, 2021, 11:54:35 pm »
That makes a lot of sense. Is there still a way to figure out the exact resistance?
 

Offline fzabkar

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Re: Plz help identify burnout resistor on motor controller
« Reply #3 on: February 03, 2021, 11:59:06 pm »
I'm wondering if it is a fusible resistor.
 
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Offline fcb

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Re: Plz help identify burnout resistor on motor controller
« Reply #4 on: February 04, 2021, 12:12:14 am »
See if there are some teardown pix on the interwebs of your exact model or ask someone to open one up and photograph the board.  The resistor colour code will allow you to work out exact value.

If it was a fusible resistor it wouldn't have burnt like that.  Also, worth checking the FET's / motor /wiring - the resistor is likely to be a symptom of the fault not the cause.
https://electron.plus Power Analysers, VI Signature Testers, Voltage References, Picoammeters, Curve Tracers.
 
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Offline freyzTopic starter

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Re: Plz help identify burnout resistor thrustmaster t500 pcb
« Reply #5 on: February 04, 2021, 01:00:15 am »
The best photo I can find is this... But I don't know what it should read. I never seen a resistor beginning and ending with black. Do you have any idea?
 

Offline picburner

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Re: Plz help identify burnout resistor on thrustmaster t500 pcb
« Reply #6 on: February 04, 2021, 08:30:46 am »
From Queen Mao Electronics: "Generally, If an additional fifth band is black, the resistor is wirewound resistor"
and from Digi-Key resistor code calculator the resistor is 0.03ohm 1% that, given where it is placed, it might make sense.
 
 
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Offline fcb

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Re: Plz help identify burnout resistor on thrustmaster t500 pcb
« Reply #7 on: February 04, 2021, 11:56:05 am »
0.03 ohms seems pretty reasonable for that posistion.  But to burn it out you're talking perhaps a couple of watts for awhile.

P=I2R, so 2W would be 8.16A. Expect there to be another fault somewhere (blown FET?).
https://electron.plus Power Analysers, VI Signature Testers, Voltage References, Picoammeters, Curve Tracers.
 
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