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JL 600/1 v3 failure
JL 600/1 v3 failure
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Old 30th November 2016, 07:16 PM   #1
dhillman is offline dhillman
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Default JL 600/1 v3 failure

Hi friends. Will like help from the knowledge and experience of this forum. I was testing the dedicated battery to the power amps of my marine music system. Removed the hot 12v wire to test the battery voltage (13.7dcv) and upon reconnection (the system was on), the JL amp started smoking immediately. It took me several seconds to disconnect the hot wire. the other(Kicker) amp was ok during this event, but the JL mono amp burnt.

Opened the case and found 6 of the 8 Power supply FETS burnt. The other 2 at the end of the board don't look burnt but have not tested them.

I already ordered 8 IRF3205 FETS, and 8-10 ohms resistors (color Brown, black, black, gold). Also ordered the PWM UC3525ADW. My question is: the vertical board that drive the FETS, also have 2 additional CHIPS LM311 and LM358. Will these chips need to be replace? What is the purpose of these other chips.

Thank you for your help.

Darrel
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Old 30th November 2016, 07:44 PM   #2
Perry Babin is offline Perry Babin  United States
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This appears to be the same as the 500/1. If it is, it's VERY rare that anything on the driver board is damaged. If it has the drivers (Q608-Q611) in front of the PS FETs, they sometimes fail. When they have been stressed, they generally have overheated solder that's obvious.

It's common for the output FETs to fail, causing the power supply to fail. Check the outputs before powering up the amp after replacing the PS FETs.
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Old 1st December 2016, 02:19 AM   #3
dhillman is offline dhillman
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Thank you Perry. There are 4 output FETS, 6413 ang. Can I test them in place in the diode mode? Q608 to q611 look okay phisically. Please reply, thank you again!
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Old 1st December 2016, 05:22 AM   #4
Perry Babin is offline Perry Babin  United States
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Are you sure that's the part number on the outputs? They generally use the IRF540 but may have changed to something else.

You can test them in diode-check mode.
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Old 1st December 2016, 09:14 AM   #5
dhillman is offline dhillman
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Thank you, I will try to attach an image of Q504-507. So test can be done with FET mounted in the circuit board!

Thank you again. Darrel
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Old 1st December 2016, 09:18 AM   #6
dhillman is offline dhillman
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Default Output FETS

I hope the stamped number can be read. Thank you.
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Old 1st December 2016, 02:47 PM   #7
Perry Babin is offline Perry Babin  United States
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NTP6413ANG is the part number. It's obsolete. If they're defective, there are others that should work.

You can check the FETs in the circuit. If they're shorted, that's easy to see with them in the circuit. If they're leaky (less common failure), they may have to be removed to see the leakage. If they're not shorted, they're likely OK.
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Old 1st December 2016, 03:07 PM   #8
dhillman is offline dhillman
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Thank you. Yes 2 of them are shorted, I ordered a suggested replacement STP60NF10. Anything else you may think that blew out related to the output FETs.

Thank you again.

Darrel
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Old 1st December 2016, 05:22 PM   #9
Perry Babin is offline Perry Babin  United States
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In the future, ask before ordering any substitute output transistors for a class D amp. This amp isn't as finicky as some but for some class D amps, substitutes that should work will not and the amp will not be reliable.

The nearby driver transistors, the SMD resistors and the driver IC (U500) sometimes fail.

There are a lot of threads for the 500/1 on the forum. Do a search for that amp and read through some of the threads.
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Old 1st December 2016, 06:57 PM   #10
dhillman is offline dhillman
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Thank you Perry. I've seen some 500/1 amplifier with different components as the 600/1 v3. So in this case, where can I get information of a suitable replacement for this NTP6413ANG? Any assistance will be appreciated.

Darrel
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