hi all, new to site but been interested in car audio since way back.my question was to see if anyone can help diagnose and possibly fix problem i.m having with my fli amp which was working fine but has now decided to stay on protection with red light. the power,remote ground are all sound and was installed professionally.i did have amp apart but made mistake of powering with board off heat sink and managed to burn out 3 fets?😱
(irz44n,s) which i have replaced but can anyone help with step by step checks to see if amp can be saved.thanks for reading.rob
(irz44n,s) which i have replaced but can anyone help with step by step checks to see if amp can be saved.thanks for reading.rob
The output transistors likely failed causing the amp to go into protect. Can you post a photo of the inside of the amp?
Email me the photo.
babin_perry@yahoo.com
They were more likely to fail if they weren't clamped tightly to the heatsink.
babin_perry@yahoo.com
They were more likely to fail if they weren't clamped tightly to the heatsink.
With your multimeter set to ohms, measure the resistance between the legs of each of the output transistors (large, black, fully encapsulated components clamped to the heatsink).
If you read anything near 0 ohms between the legs of any individual transistor, it's likely shorted. Remove it from the board and re-check it.
If you read anything near 0 ohms between the legs of any individual transistor, it's likely shorted. Remove it from the board and re-check it.
did you recieve pic would they be the smaller one,s with silver face or larger all black ones. i think i had 0.65 ohm across one across 2 legs
i got 0.67ohm across one set of legs and around 3 ohms across set on second transistor would that likely be fault is 3ohms considererd shorted out/faulty it only that set the other three pairs have identical readings alot higher
I have similar problems with an FLI 800s, stuck in protect mode. Did you manage to get yours working Rob??
I currently have mined opened up, board is identical to your 900s.
I currently have mined opened up, board is identical to your 900s.
I have a similar problem too and mine's a 900S.
Do you have any pictures from underneath the smaller PCB board of the larger board? One of my resistors under there have melted and I haven't got a clue what size it is for me to be able to replace it. It's on the left of that picture, 1st resistor on the left under the smaller board. Any help much appreciated. Thanks
Do you have any pictures from underneath the smaller PCB board of the larger board? One of my resistors under there have melted and I haven't got a clue what size it is for me to be able to replace it. It's on the left of that picture, 1st resistor on the left under the smaller board. Any help much appreciated. Thanks
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