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Hertz HP1D - Output FETs getting shorted always
Hertz HP1D - Output FETs getting shorted always
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Old 14th September 2021, 11:09 AM   #1
coed1992 is offline coed1992
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Default Hertz HP1D - Output FETs getting shorted always

hi, i 've been working on this amplifier, it does'nt have audio output, Then suddenly it went on Protect mode while troubleshooting, i removed all the output MOsfets , 4 in each sides. I found out that 1 of them was shorted. for safety I fixed first 4 mosfet 1 in each hi and lo side, then again 2 of the mosfets i the same side Hi and Lo went shorted in no time which made the Supply Fets on the same side go hot. What is causing the output Mosfets to get shorted? I don't want to replace another one because it might short again. Please i need help who came across this problem. Thank you very much.
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Old 14th September 2021, 11:33 AM   #2
Perry Babin is offline Perry Babin  United States
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Did you replace the driver IC for the FETs that failed?
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Old 14th September 2021, 07:47 PM   #3
coed1992 is offline coed1992
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No not yet, you mean if its driver IC's fail then it will short the FEts as well ? let me pull out the driver board and and replace the driver IC. Thanks again bro, will get back to you , the status of the repair.
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Old 14th September 2021, 09:16 PM   #4
Perry Babin is offline Perry Babin  United States
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Virtually every time that the outputs fail, the driver IC fails. In some cases, where there are buffer transistors, the ICs survive but you can plan on replacing the IC every time the output fail.

In many cases, the failure of one IC leads to the failure of all driver ICs.
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Old 15th September 2021, 04:35 AM   #5
coed1992 is offline coed1992
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thanks for the info bro, it is a big help for us still beginners to car audio repairs. I will get back to you any progress of the repair.
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Old 15th September 2021, 07:48 AM   #6
coed1992 is offline coed1992
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I pulled out the driver board DWM3640AD and I believe the iC's U1,U2,U3, and U4 are
U1(IRS21844S), U2 (TL072) , U3 (LM211) and U4(IRS21844S) respectively? Thanks.
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Old 15th September 2021, 08:07 AM   #7
Perry Babin is offline Perry Babin  United States
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I'm not 100% sure on this board but that sounds right. For the LM211, confirm that pins 1 and 4 are directly connected.
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Old 13th October 2021, 07:16 PM   #8
coed1992 is offline coed1992
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Good day bro, yes as I pulled out the DWM360 driver board and about to changed the two IRS2844s because I measured a short at pin 13 and 11 of this chips which is causing the out Fets on low side to blow but what I noticed of the CL1 and CL4 circled red in the picture have different value 30k ohm and 5 Mega ohm respectively. I'm not sure of these components but are these capacitors ?, what are the correct value of these components as they are directly connected bet. 13 and 11 of the driver chip. Thank you mate in advance.
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File Type: jpg DWM3640AD.jpg (104.2 KB, 29 views)
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Old 13th October 2021, 07:23 PM   #9
Perry Babin is offline Perry Babin  United States
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They are capacitors. The value varies, depending on the amp but they're generally between 4.7 and 6.8uF.
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Old 13th October 2021, 07:53 PM   #10
coed1992 is offline coed1992
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Thanks mate, so i can order any value between 4.7 and 6.8uf ? but can i use a 50v multilayer ceramic capacitor, what size shall I order?
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