Harman/Kardon Onyx Bluetooth Speaker - No Power

[fzabkar]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Would it be worth isolating the reset pin at the PCB (by desoldering it) and then shorting this pin manually? This would also confirm whether the leakage (?) to ground is external or internal. Is this kind of leakage a typical failure mode of MLCCs?

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

R306 may just be a 0 Ohm resistor, although why they'd use that, I don't know. Maybe they had something higher value there during prototyping and testing, and use 0 Ohm in production.
Resistors don't fail shorted, and there isn't anything in parallel with it that I can see, so it's probably supposed to be 0 Ohms.

If Q301 has 0v on the base, it should be turned off. Thus, it should not be pulling reset low.

BUT... If you are measuring only 781 Ohms across C306 (and incidentally, probably also across C-E of Q301) that could indicate a problem. Try measuring resistance across it again both ways (ie, swap your probes around), see if the readings change. Also might be interesting to see what you get both ways in diode mode too.

Also can you check if the Emitter of Q301 is connected to ground?

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Ok I'm getting 0v at base (left pin) of Q301 and 1v on collector (tab) same 1v going into the reset pin.

Measurements
R304 - 14.2k ohms
R306 - 0 ohms - shorted or something in parallel with it shorted?
R308 - 220k ohms
C306 - 781 ohms

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Isn't R308 connected between base and emitter?

BTW, the pinout is BCE.

Yes R308 is between B-E, I made a mistake the first time.
Q301 Pin numbers are not correct for SOT23, I think the program defaults to TO92. I've removed them. (Need lunch!)

[fzabkar]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Isn't R308 connected between base and emitter?

BTW, the pinout is BCE (left, tab, right).

T4 (D301) could be a 2.7V zener or a 1N4148, but it doesn't look like the latter. Perhaps it senses the battery voltage, but I can't see how it would work with Q301 to do this.

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

That is strange. I would have expected the reset line to be either 3.3v or 0v, never 1v. Perhaps R304 is going high or open, or something is partially shorted (C306 or Q301). Or perhaps I just don't understand the circuit function...

From what I can see:
R304 seems to be a pullup, probably to the 3.3v rail. C306 likely provides the debounce and the 5ms delay the datasheet speaks of.
It looks like Q301 is for pulling the reset line low externally from somewhere else, but what exactly turns it on, I am not sure. I've drawn a schematic of what the circuit seems to be.

What voltage you get on the base and collector of Q301? Compare these between when reset is 1v and when it is 3.25v and see if there is a difference.
For pinout, check the datasheet attached. (The Code W1A comes back to PMBT3904 which is a common part)

Also, can you measure the resistance of R306, R304 and R308?
Also, do you get any resistance measured across C306?

Can you post a photo showing the PCB tracks around Q301 with more light? I can't see where the tracks go near C317 and C318 etc.

EDIT (Mistake in Schematic on R308)

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Ok this is weird I just measured again and now get 1v on reset pin, however now one side of R304 has 3.25v and the side going into R306 has 1v

Possible it's bad? Both sides measured 3.25v just a bit ago

There's also 1v on the lead of that surface mount transistor? That's above R304 the lead that's next to its label Q301

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Possibly your probe did not make a good connection the first time. If you get 3.25v on reset, then that sounds normal. In that case, I'm out of ideas unless you have a scope to check the clock.

The only other thing I could think is giving it a manual reset while the button is pressed by shorting across C306 momentarily. In the event that C306 is open circuit and is not allowing the reset signal to go low for at least 5ms but this is unlikely...

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Ok that's weird I went to measure again and got no voltages at same pins, measured battery and it was 3.8v so I plugged the charger in and now I have 3.25v on the reset pin as well as on both sides of the resistor you wanted me to check.

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Hmm... that does not sound right...

The BT module can work on 1.8v or 3.3v, and has its own internal 1.8v regulator, which it supplies through Pin 15, and which seems to be working. I assume that 1.8v regulator is powered from either Pin 32 or 34, or both. (Out of interest, what do you measure on those pins?)

According to the datasheet, the voltage at Pin 13 determines the operating mode. Since you measured 3.3v on the supply pin, Pin 13 - it seems to be operating in 3.3v mode. 3.3v CMOS logic levels require 2v-3.3v for a logic high, so 1v would not be considered a high in that case. In fact, 1v is barely at the threshold for a 1.8v logic high, which is 1.17v.

Can you take a close up photo of the area above the module where the trace from R306\C306 leads to R304, near Q301? And see what voltage you get on the each side of R304 too?

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Testing voltage at the reset pin it goes to 1v when power button pressed and doesn't change unless I release power button and then the voltage drops.

Also measured before the resistor going to that pin and get same voltage (to rule out that the resistor value increased)Does that mean it's staying low?

Also there is 3.3v present on the VDD pin 13 so it is receiving that voltage as well as 1.8v on pin 15 so that voltage is present as well.

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Ok that layout confused me with the dimensions? On each pin which are numbered

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Yes, you need to measure the voltage at that pin. You will probably need to press the power button too.

In digital logic terms, low means a zero - or normally 0v, and high means Vcc\supply voltage (In this case, probably 3.3v)

To be 100% sure the signal is OK, you would need to ensure that during the power-up sequence, the reset line stays low for at least 5ms, then goes high (as stated in the datasheet) This would need to be done with a logic analyzer or digital scope... but that's probably getting ahead of ourselves...

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

How exactly do I check to make sure it's not staying low? Am I looking for a voltage at pin 3?

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Go look at the file SPEC-BM153-V4.3_03122009.pdf I linked\uploaded. On page 3\4 it tells you which pins do what.

Pin 1 on the module is marked with a 1. In your photo, it's the bottom-right corner. From pin 1, the rest are numbered in an anti-clockwise fashion around the edge.

Pin 3 thus, seems to connect to R306 on the main board. According to the datasheet:
"Reset if low. Input debounced so must be low for >5ms to cause a reset"

So you want to check that Pin 3 is not staying low, as that would hold the module in a reset state and nothing would happen.

You should probably also check power pins, Pin 12, 13, etc to make sure power is actually getting to the module.

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Thanks guy! How do I go about trying the external reset first? As it seems the easiest

[fzabkar]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Curiosity led me to this Onyx Studio FCC database page:

https://apps.fcc.gov/oetcf/eas/repor...c_id=APIONYXST

Underneath the heatsink are two TI TPA3116D2 power amps.

TPA3116D2EVM Evaluation Module
https://cdn.badcaps-static.com/pdfs/...19c7d8b85a.pdf

TPA3116D2, 50W Filter-Free Class-D Stereo Amplifier with AM Avoidance:


The following thread discusses the Harman Kardon ONE device:

http://www.oluvsgadgets.net/2015/06/...mware-fix.html

The HK ONE uses the same BM150 module (see the internal photos):

https://apps.fcc.gov/oetcf/eas/repor...cc_id=APIHKONE

Just FYI, the following links constitute a firmware update for the HK ONE. I'm guessing that a similar procedure using the same (?) software but different payload would apply to the ONYX STUDIO.

Uploaded firmware 1.4.1, CSR BlueSuite and installation manual:
http://putit.ru/download/MjMxNjU3OTYyMTUzOA==
http://my-files.ru/d58uuf.JBL_CHARGE_2.7z
http://higgs.rghost.ru/download/89c8...BL_CHARGE_2.7z

[fzabkar]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

I found one more document that may or may not be of use.

Here is the FCC page for "a 2.0 Speakers System" manufactured by Guoguang Electric Co.,Ltd (FCC ID: 2AAP8HSBT67):

https://apps.fcc.gov/oetcf/eas/repor...id=2AAP8HSBT67

There are two schematics:

https://apps.fcc.gov/eas/GetApplicat...tml?id=2141465
https://apps.fcc.gov/eas/GetApplicat...tml?id=2141466

One of the schematics shows the internal circuit diagram of the Bluetooth module, plus it shows the pinout of the PCB. The module's part number is BM153 rather than the Onyx's BM150, but I believe that they are the same module. According to the Rockbox datasheet, BM153 is the order number for the 3.3V version of the BM150. Also, Sunitec's web site states that the BM150 is "factory configurable to either 1.8V or 3.3V supply". Make sure you order the 3.3V version rather than the 1.8V.

I don't know if these modules need to be reprogrammed, but I would be prepared for that possibility. In fact ISTM that the Programmable Input/Output Lines would need to be configured by each appliance manufacturer to correspond to their specific button and LED functions.

BTW, be very careful when buying your module. I found other modules that look very similar but have slightly different pinouts (pins 53-60 are different).

The following examples are similar but NOT identical to the BM150:


https://cdn.badcaps-static.com/pdfs/...731f5c4cff.pdf

[Agent24]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Looks like it's a BM150 from Sunitec: http://www.sunitec.com.tw/product-it...avi=52&uid=123

Found a BOM on FCC website: https://cdn.badcaps-static.com/pdfs/...667a2bc897.pdf

Also found datasheet for the BM150 here: https://cdn.badcaps-static.com/pdfs/...a02ece2fe5.pdf (Page 4 of this document shows the module's pinout)

Datasheet for Bluetooth chip BC57E687C here: https://cdn.badcaps-static.com/pdfs/...086079d3a0.pdf

You better hope it's an issue with the external Reset line or something, as I doubt troubleshooting that module would be easy, nor would replacing the chip, unless you can do BGA rework. And it doesn't look like new modules are easy to get either.

I'm wondering, would the company give out the schematic if I contacted them or something they don't make public?

If you asked nicely and were extremely lucky... you are still unlikely to get it

[caphair]

Re: Harman/Kardon Onyx Bluetooth Speaker - No Power

Here's a pic hope it helps. I'm curious to get it going if possible. This thing was $300 brand new. I'm wondering, would the company give out the schematic if I contacted them or something they don't make public?