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HFI1500D Power Fets Blow After Remote is Disconnected
HFI1500D Power Fets Blow After Remote is Disconnected
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Old 6th September 2019, 07:03 AM   #11
djeokis is offline djeokis
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yes, 47ohms
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Old 6th September 2019, 07:18 AM   #12
Perry Babin is offline Perry Babin  United States
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Did you confirm that the drive signals were identical on both banks of PS FETs?

This will be more reliable if the FET locations are loaded.

Did you try removing the B+ and remote together to see if the FETs would survive?
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Old 6th September 2019, 07:23 AM   #13
djeokis is offline djeokis
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Yes, both signals are identical. If i disconnect both, remote and B+ the amp survives, if i only disconnect the remote, with the power supply i have, it's only burning one FET at a time, if take it to my vehicle, it blows all 5 FETs at once when removing the remote.
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Old 6th September 2019, 07:36 AM   #14
Perry Babin is offline Perry Babin  United States
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You'll have to remove the PS FETs and clean the solder pads.

Monitor the DC voltage on terminals 3 and 4 of the PS control IC carefully when the remote is removed. Set the scope to 2ms and about 1v/div. When remote is removed, does the voltage on either terminal go negative?
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Old 6th September 2019, 07:56 AM   #15
djeokis is offline djeokis
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Removed FETs and cleaned pads / B+ 15v / Terminal 3 = 15V / Terminal 4= 14.39V /
None went negative after removing the remote signal.
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Old 6th September 2019, 07:59 AM   #16
Perry Babin is offline Perry Babin  United States
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3 and 4 can't be at those voltages.

You need to monitor with your scope. The meter isn't likely to be fast enough to catch any negative pulse.
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Old 6th September 2019, 08:02 AM   #17
djeokis is offline djeokis
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Pins 3 and 4 from IC 7500? ... i was measuring terminal post 3 and 4 from the module.
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Old 6th September 2019, 08:09 AM   #18
djeokis is offline djeokis
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I measured Pins 3 and 4 / Pin 3 has no pulse. / Pin 4 shows a negative pulse after removing remote.
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Old 6th September 2019, 08:21 AM   #19
Perry Babin is offline Perry Babin  United States
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It's probably being used for a softstart and that can cause the problem you're having.

Is the voltage on pin 12 dropping to 0v IMMEDIATELY when remote is removed?
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Old 6th September 2019, 08:29 AM   #20
djeokis is offline djeokis
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If that were the case, IC gone bad? Measured pin 12, voltage drops to 0.35v then starts to drop down when remote is removed.
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