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Shorted Transistors In Active Sound Speakers

By on May 29, 2020
active sound speaker repair how to

A speaker that was sitting in my shop for almost 45 days. I was not able to get to my shop due to the spread of the Covid 19 virus because everything was on lock down. Now it got better in the Bethlehem area (still keeping my distance) I was able to go to the shop and resume my repair business there.

how to repair jbl active sound speakers

It is an active speaker which means it has an amplifier built in. JBL considered to be very liable sound quality devices.

This device was completely dead and to get inside the device I had to take lots of screws off.

how to fix jbl active sound speakers

That is the audio control panel on the back of the speaker and as you can see, it was dusty and needed a lot of cleaning.

fixing jbl active sound speakers

Finally I was able to get inside the device and as usual I looked around for burnt components but I found none.

shorted transistors in active sound speakers

As I looked to the parts here, all of them tested fine except two of them and they had to be replaced.

shorted transistors fqp30n06 in active sound speakers

These two component were shorted out and I was lucky to find two in my shop otherwise the customer has to wait for a long time to get his device fixed.

shorted 17p06 transistor fet

The part number is 30N06 and 17P06 and make sure do not get confused between the two when doing the actual replacement.

Once the replacement was done and I put everything back together, I was a little bit hesitant to power it on but finally, I powered it up and the result was just great.

jbl active sound speaker repaired

Mission Accomplished.

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous repair articles in the link below:



  1. Parasuraman S

    May 29, 2020 at 9:10 am

    Excellent and professional way of trouble shooting! Many thanks for sharing!

    • Waleed Rishmawi

      May 29, 2020 at 6:58 pm

      Parasuraman: I thank you my friend for the nice encouraging comments. have a blessed day

  2. Lynn Blakely

    May 29, 2020 at 9:55 am

    Good Job, made easy by checking all the discreet components.

    • Waleed Rishmawi

      May 29, 2020 at 6:59 pm

      Lynn: thanks. when the experience is there, checking becomes easier. have a blessed day

  3. Albert van Bemmelen

    May 29, 2020 at 1:01 pm

    I'm sure that luck has not much to do with finding the two components (a 60V P-channel mosfet and a 30 Amps 60V N-channel mosfet) that had to be replaced. A professional shop like yours always seems to have the right parts in stack.

    • Waleed Rishmawi

      May 29, 2020 at 7:01 pm

      Albert: one of the keys to good repair results is having parts in stock and if there is none found in my shop, i also have good sources in town and on the net for ordering parts. have a good day my friend. thanks for your comments.

  4. yogesh Panchal

    May 29, 2020 at 6:23 pm

    Good job Waleed!

    • Waleed Rishmawi

      May 30, 2020 at 2:49 pm

      Yogesh: thanks man. have a blessed safe day

  5. Tito Kanshulu

    June 9, 2020 at 4:31 pm

    Good and interesting article Waleed. The best thing about this repair is that you had replacements in stock.


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