MTX thunder 81001 board mvp171-c identify 4 burned resistors

mobilepcrepair79 · 20th September 2010, 12:09 AM

Everything looks great on this amp, took me a while to notice the bad components. They must have gotten a little hot as some of the color bands are flaked off. If someone could help me to find the value of these = r490, r491, r492, r493 thanks.

Perry Babin · 01:29 PM

Where are these resistors?

mike49504 · 20th September 2010, 03:17 PM

The resistors R490,491,492,493 are all the same They are Brown,black,orange,gold, They are 10K 1 watt resistors.

The resistors connect to the middle leg of the output transistors.

mobilepcrepair79 · 20th September 2010, 04:12 PM

Great thanks mike49504, so these would be ok? Digi-Key - 10KW-1-ND (Manufacturer - RSF100JB-10K) One more thing, is it posssible that these could have failed without killing anything else? The rest of the board and components look fine, there was only very slight discoloration on the bottom side of the board under the four resistors, and the owner of it said that it worked still but would go into protect if volume turned up. Just hoping for a quick fix i guess. Once again thanks for identifying those for me, google wasn't getting me anywhere.

mike49504 · 21st September 2010, 02:57 AM

Always possible.

I would also check the outputs to see if any are shorted or leaking just to be safe.

20th September 2010, 12:09 AM	#1
mobilepcrepair79 diyAudio Member Join Date: Sep 2010	MTX thunder 81001 board mvp171-c identify 4 burned resistors Everything looks great on this amp, took me a while to notice the bad components. They must have gotten a little hot as some of the color bands are flaked off. If someone could help me to find the value of these = r490, r491, r492, r493 thanks.

20th September 2010, 01:27 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Where are these resistors? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links Last edited by Perry Babin; 20th September 2010 at 01:29 PM.

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20th September 2010, 03:17 PM	#3
mike49504 diyAudio Member Join Date: Sep 2006	The resistors R490,491,492,493 are all the same They are Brown,black,orange,gold, They are 10K 1 watt resistors. The resistors connect to the middle leg of the output transistors.

20th September 2010, 04:12 PM	#4
mobilepcrepair79 diyAudio Member Join Date: Sep 2010	Great thanks mike49504, so these would be ok? Digi-Key - 10KW-1-ND (Manufacturer - RSF100JB-10K) One more thing, is it posssible that these could have failed without killing anything else? The rest of the board and components look fine, there was only very slight discoloration on the bottom side of the board under the four resistors, and the owner of it said that it worked still but would go into protect if volume turned up. Just hoping for a quick fix i guess. Once again thanks for identifying those for me, google wasn't getting me anywhere.

21st September 2010, 02:57 AM	#5
mike49504 diyAudio Member Join Date: Sep 2006	Always possible. I would also check the outputs to see if any are shorted or leaking just to be safe.

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