Pkoenix Gold Rival V8001

seankane · 24th November 2011, 06:46 AM

Working on this amp and it was brought to me partially disassembled.

The customer said it powered on but had no output.

I tested the output fets and found a few shorted. I removed all the output fets from the amp.

I powered up the amp and it turns on and does not go into protect, the green led stays on and it does not draw any current.

There is 2.495 vdc on the - terminals

There is 4.95 vdc on the + terminals

The fets I removed I believe are an IRFB4710 someone correct me if I am wrong.

Shall I order these fets or is there a suitable sub I can use?

Not sure about the DC on the terminals and why it is different from positive to negative being this is a mono amp.

I have posted a pic of the board. I have not removed it and I am assuming the board number is on the back side.

Perry Babin · 24th November 2011, 07:00 AM

There is nothing to determine where the speaker terminals float to without the amp in full operation.

I don't know if that's the right part number. I'd suggest trying the originals. If they don't work, I'd suggest trying the IRF3710Z. They almost universally work in 4080 amps.

seankane · 24th November 2011, 07:02 AM

Ok the fet numbers on the case were as follows:

FB4710
IR735P

Thats how they look on the fet.

seankane · 24th November 2011, 07:11 AM

Reading some of the other posts on different amps with the 4080 it sounds like I should definantely replace the 4080 if there was any shorted output fets?

Perry Babin · 24th November 2011, 07:40 AM

Yes. Replace the 4080. It may have survived but there's no point in using the old one. If you reinstall it to check it after you've got the amp working, you can determine if it's OK. Then you can keep it to use as a temporary replacement when checking other 4080 amps.

seankane · 24th November 2011, 07:47 AM

Will the IRF3710ZPBF work fine?

Perry Babin · 24th November 2011, 07:52 AM

They're not rated for as much current as the originals. I think they will work but I don't know if they'll be as reliable.

seankane · 24th November 2011, 08:36 AM

I ordered the parts from Allied wont see them till next week. If I install the new output fets and power up the amp with a bad 4080 it wont destroy the new fets will it?

I ordered IRFB4710 fets and HIP4080AIPZ that was the exact part numbers on the parts.

Perry Babin · 24th November 2011, 08:39 AM

It depends on the amp's design. If there are high value pulldown resistors between the gates and drains of the outputs, you can power it up without the 4080. If there are no pulldown resistors, it may destroy the FETs if the 4080 isn't in the circuit.

seankane · 24th November 2011, 08:45 AM

Here is a close up of the output fet area, what do you think?

24th November 2011, 07:00 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There is nothing to determine where the speaker terminals float to without the amp in full operation. I don't know if that's the right part number. I'd suggest trying the originals. If they don't work, I'd suggest trying the IRF3710Z. They almost universally work in 4080 amps. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th November 2011, 07:02 AM	#3
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Ok the fet numbers on the case were as follows: FB4710 IR735P Thats how they look on the fet. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

24th November 2011, 07:11 AM	#4
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Reading some of the other posts on different amps with the 4080 it sounds like I should definantely replace the 4080 if there was any shorted output fets? __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

24th November 2011, 07:40 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Yes. Replace the 4080. It may have survived but there's no point in using the old one. If you reinstall it to check it after you've got the amp working, you can determine if it's OK. Then you can keep it to use as a temporary replacement when checking other 4080 amps. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th November 2011, 07:47 AM	#6
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Will the IRF3710ZPBF work fine? __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch


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24th November 2011, 07:52 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	They're not rated for as much current as the originals. I think they will work but I don't know if they'll be as reliable. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

24th November 2011, 08:36 AM	#8
seankane diyAudio Member Join Date: May 2010 Location: Washington State	I ordered the parts from Allied wont see them till next week. If I install the new output fets and power up the amp with a bad 4080 it wont destroy the new fets will it? I ordered IRFB4710 fets and HIP4080AIPZ that was the exact part numbers on the parts. __________________ Pyramid 46 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

24th November 2011, 08:39 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It depends on the amp's design. If there are high value pulldown resistors between the gates and drains of the outputs, you can power it up without the 4080. If there are no pulldown resistors, it may destroy the FETs if the 4080 isn't in the circuit. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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