Harman/Kardon Onyx Bluetooth Speaker - No Power

[QwertyChouskie]

I have a Onyx Studio that doesn't power on. No components look visually damaged. I noticed that BT_3.3V was only at ~3.0v, after some measuring around, I found that L600 had ~3.3v coming in but only ~3.0v going out. I bypassed it for testing with a small jumper, now BT_3.3V measures at ~3.275v, but the speaker still doesn't work. Battery is fully charged at almost exactly 4.2v. I tried removing C306 but it didn't seem to change anything. Any other ideas where to look?

Plugging the USB port into my laptop and running `lsusb` doesn't show the speaker, not sure if this info helps.

[csabikat]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Hi AGENT24!
I have an ONYX STUDIO 4. I plugged my scooter charger into it. The charger IC is burnt out. That's all it looks like visually. I would like to fix it. Unfortunately, I can't find a plan for it anywhere. Could you help me? I can't find a service manual link either.

Thanks in advance

Hello everyone!
Here is the Onyx studio 4 service manual

[csabikat]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

U701 is probably faulty, or C706 shorted?

Hi AGENT24!
I have an ONYX STUDIO 4. I plugged my scooter charger into it. The charger IC is burnt out. That's all it looks like visually. I would like to fix it. Unfortunately, I can't find a plan for it anywhere. Could you help me? I can't find a service manual link either.

Thanks in advance

[Quantum IC]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Hello everyone
I have the same Onyx Studio that does not turn on.
The BC57E687C Bluetooth chip gets warm after 1 minute with the AC adapter connected.
I hope youcan help me please.

[svipmt]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Finally . I modding power charging battery by LM7805 and everything is OK . But charging battery near 8 hours when battery is very low,can't to start system :P . I'm no care because I alway using power apdater,sometime i go out to use on battery . Thank a lot

[svipmt]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

I no find replace U701 IC . You can help me new solution ? . I plan to mod a extend power stepdown module for charging battery

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

U701 is probably faulty, or C706 shorted?

[svipmt]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

I removed C306 and turned on ok but not charging battery . I connect apdator and remove battery and check Vbat pin is 0V

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Are you getting 4.7v from the new U700?

[svipmt]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

I'm bad english . I have onyx studio no power . I checked board see D300 explosive and U700 short circuit . I have replace new D300,U700 and still not work ? Anybody help me fix this ? thank

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Harman/Kardon Onyx schematic diagram

Nice! Thanks

[army_wang]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Harman/Kardon Onyx schematic diagram

[budm]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Well, more likely one of those 4 caps is shorted out or the IC itself. I would carefully remove hose caps one at a time to see if the shorts will go away.

[pluton23]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

https://www.badcaps.net/forum/attach...8&d=1490813608
Check the RESISTANCE between the two legs of C713 (the smallest cap of the four caps) to see what it shows. Make sure to report if the reading is in Ohm, K Ohm, or M Ohm.
BTW, that black carbon on the board should be removed, it is conductive.

C713 = 0.6 Ohm, but i have only usual multimeter now.

Black carbon will be removed certainly, i have not started the repair, only wiped with alcohol.

[budm]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

https://www.badcaps.net/forum/attach...8&d=1490813608
Check the RESISTANCE between the two legs of C713 (the smallest cap of the four caps) to see what it shows. Make sure to report if the reading is in Ohm, K Ohm, or M Ohm.
BTW, that black carbon on the board should be removed, it is conductive.

[pluton23]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

So those 4 caps connected in parallel to the output side (which feed pin 2 input pin of the IC) of L701 are all OK and not shorted?
I wish you will show the pictures of the board after clean up.
You need to verify if there are any shorted circuit before even trying to locate the replacement inductor.

cleaned up board

[budm]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

So those 4 caps connected in parallel to the output side (which feed pin 2 input pin of the IC) of L701 are all OK and not shorted?
I wish you will show the pictures of the board after clean up.
You need to verify if there are any shorted circuit before even trying to locate the replacement inductor.

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Unfortunately I don't know what value or properties it has.

[pluton23]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

how to identify this inductor to replace it with new?
соuld you send specific information about this part?
thanks.

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

The burnt component is L701. It's an inductor, not a capacitor. See photos posted earlier in the thread.