Bose Soundlink Mini schematic ? - Page 1
Forum section: electronics / general

author: Skappy
author_rank: Contributor
timestamp: June 17, 2014, 06:59:42 am
content: Dear All,Sorry to disturb you but I think that I need your help !First of all please apologize my poor english but I'm a french owner of 2 Sound link Mini Bose devices. I'm encountering difficulties with them as I can no more power them on !One of the device never reach the green led colour stating that the charge is OK, it blinks orange and that's all. No way of using it.The other device comes to green led when charging period is over but I could no more power the device on anymore. Pressing the power on button do nothing , actually all buttons are inoperative.After a visual check , it looks like a crystal is missing in one device.So, here is my request : As I have not find it by myself, may I ask you if you know where i could find the Bose SoundLink Mini schematic please ?Thank you very much for your help and your kindnessHave a nice daySkappy

author: jdamewood
author_rank: Newbie
timestamp: June 18, 2014, 12:15:26 am
content: Skappy,Have you tried Bose's customer service in your area?

author: Skappy
author_rank: Contributor
timestamp: June 18, 2014, 08:56:52 am
content: Hi jdamewood,thank you very much for your answer.Yes, i've contacted the french Bose's customer service via Bose international. They should contact me soon but I'm afraid that they will not consider my request as both devices are no more under guarantee.I'm quite astonished by the missing crystal in one device, it's strange as the previous owner told me that he has not 'hack' the device ... It look that the crystal goes with the MCU but, due to the Bose rules, no name appears on the components on pcb ...I have found no technical information on internet concerning this device, i'm looling for help in order to investigate more deeply.I'll keep you inform for general informationThank you very much once againHave a nice daySkappy

author: jdamewood
author_rank: Newbie
timestamp: June 18, 2014, 11:29:25 am
content: Skappy,Do the assemblies beep when the AC charger is plugged into the Soundlink Mini and wall outlet?

author: Skappy
author_rank: Contributor
timestamp: June 18, 2014, 12:03:21 pm
content: jdamewood,No nothing happens no light, no sound ....One of the device charge up to the green led, but once unplugged from the wall it does not start, all buttons are inoperative. The second device seems to charge well, orange led os on but it does not comes to green, the led ends to flash orange and that's all ...I do not know from where I should start ... Both Batteries look good (tested with multimeter) ...Good ideas are more than welcome , i could also take pictures if need beThank you once againSkappy

author: jdamewood
author_rank: Newbie
timestamp: June 19, 2014, 09:55:04 am
content: Skappy,You can try to hard reset by holding the power and mute button until 3 white LEDs flash from above the mute, bluetooth and Aux buttons.Sure take some pictures.

author: Skappy
author_rank: Contributor
timestamp: July 03, 2014, 07:22:02 am
content: Hi,I made some progress since the last post ... One of the two devices finally start up again, the power button was wrong ...But I still need your helpAs already said, i have a second device. This one does not power up and when charging , the charging led keep shining orange and then it flash but it never shine green (which would mean the end of the charge). I have tested the battery and it seems that despite the colour of the led it charges ... I have also compared the two pcb and it look like a resonator (oscillator) is missing. May I ask you to have a look at the enclosed file please ?As no nomenclature is mentionned on the component :Do you have any idea of what frequency I should use in order to try to replace this missing part please ? (I don't know what is the chip near the crystal...)According to you is it possible to "guess" the value of the resonator present on the working PCB ? (a kind of crystal reader ?)and finnalyDo you think that this missing resonator can explain the charging issue ?Thank you very much for your help and your patience.Have a great daySkappy

author: Skappy
author_rank: Contributor
timestamp: July 04, 2014, 02:39:48 pm
content: Hi,I've got an another idea ...May I ask you if you know if a kind of "commonly used frequency" exists concerning resonator used for clocking chip ?Do you think that I can try 32.768 KHZ ?Thank you very much for your helpHave a nice daySkappy

author: jdamewood
author_rank: Newbie
timestamp: July 08, 2014, 04:17:06 am
content: Skappy,Sorry to give you some bad news. The provided image is not a Bose Soundlink mini PCB. There would be a white Bose logo on PCB. The PCB component layout is different and the company does not normally remove the component markings.I cannot provide you schematics because it is property of Bose Corporation and this is a different design.Are you sure this is for a Soundlink Mini?James

author: Skappy
author_rank: Contributor
timestamp: July 08, 2014, 06:32:12 am
content: Dear Jdamewood,First I would like to thank you very much for your attentionas I could not find much information concerning my problem elsewhere ...I confirm that the pcb photo comes from one of the 2 soundlink mini I've bought via Internet to a "supposed" official Bose dealer. I have dismantle the unit, and soldered a 32.768 Khz crystal in the empty place but it does not work ! I have noticed the presence of an APM4953K (Dual P Channel Enhancement Mode Mosfet) and as the charging process never end, (led keeps shining in orange colour and never comes to green), I would like to test this component and change it if need be ...I could not find information concerning this pcb and no value is written on it ...I could not believe that i have bough a counterfeit Bose product ? That's a really a pity ...May i ask you if you know if it is possible to buy a official Bose PCB please ? Not sure to be able to afford a new complete unitThank you very much Jdamewood ...Have a nice daySkappy

author: jdamewood
author_rank: Newbie
timestamp: July 08, 2014, 10:23:57 am
content: Skappy,I am impressed someone would go to the trouble layout a PCB, pick n place components, oven reflow the components. Although the middle component at 45 degree offset appears to have been manually reworked.I not sure 32.768kHz crystal will do you any good. The Bluetooth microcontroller is usually driving by much higher frequency and multiplied by PLL for 2.485GHz carrier.Sorry I cannot provide you will with replacement PCB's.Can you provide the internet site where you purchase these to keep someone else from making the same mistake.Thank you,James

author: Skappy
author_rank: Contributor
timestamp: July 10, 2014, 10:12:15 am
content: Dear jdamewood,Thank you very much for your help ... I would like to understand what is going wrong , it looks like a power supply problem but I'm not good enough for understanding where to look at ...I will keep trying to test smt components but please may i ask you where i can provide me with a replacement mother board please (guenine would be very fine, but everything will be great).May I ask you if you can give me the pcb # code of the official PCB please ? it would ease my quest ...jdamewood, i understand that I ask you a lot, but you are my only hopeThank you very much jdamewood, have a great day

author: jdamewood
author_rank: Newbie
timestamp: July 10, 2014, 12:35:21 pm
content: Skappy,I cannot not provide you with replacement PCBs because they belong to Bose. You have another working assembly. Compare the voltages around the charge/buck converter (if the fake PCB has one) and see what is different.I can get you contact with a Bose employee who would be interested in where you purchase the fake product. Maybe can negotiate a deal with them.

author: amyk
author_rank: Super Contributor
timestamp: July 10, 2014, 01:29:16 pm
content: If it was working before without the crystal, I doubt it's needed.Despite the component markings being erased, it's usually possible to identify components from their package, pinouts, and function - often Vcc/Gnd is enough. There appears to be a QFN48 and a QFP48, and a SOIC28. Clearer pictures of the PCB woudl be helpful.

author: jdamewood
author_rank: Newbie
timestamp: July 11, 2014, 04:26:35 am
content: Need that CSI zoom/enhance software to clean up the image.

author: Skappy
author_rank: Contributor
timestamp: July 16, 2014, 07:35:25 am
content: Dear All,I've tried to enhance the quality of the 2 photos and even manage to read some of the name of the componentsHere you will find the 2 new files (please click on the image to increase resolution)http://www.casimages.com/img.php?i=140716093136949083.jpghttp://www.casimages.com/img.php?i=140716093336401114.jpgHere is a list of the 'readable' nomenclature as mentionned on the photos...-78L05-Huatai NB6801A- 4410 TF 334C- HT9926- APM 4953K- C64F G26277- 4558D JRC- 3410- J3Y- 2TYMay I ask you to have a look at the 2 files please ?May I also ask you if, according to you, components such as transistor and capacitor must be removed in order to be tested ?Can you please help me in finding what kind of basis tests i can run in order to test this pcb please ? I have access to a multimeter, an rigol oscilloscope and 2 peak atlas analyzers (LCR40 and DCA55).Given the never ending charging problem do you think that APM 4953K could be incriminated ?I would like to thank you very much for the help and your kindnessHave a great daySkappy

author: Skappy
author_rank: Contributor
timestamp: July 18, 2014, 07:36:01 am
content: Dear All,May i request you some help please ?Thank you for your attentionHave a great day

author: amyk
author_rank: Super Contributor
timestamp: July 18, 2014, 02:56:59 pm
content: You could start by checking the output of the 78L05.TheHB6801is a boost converter, probably for powering the LEDs. Probably doesn't need checking.Other components you've identified:Si4410BDYMOSFETHT9926MOSFETAPM4953dual P MOSFETJ3Y is a common S8050 NPN transistor, 2TY is the complementary S8550 PNPC64F is a 24C64 I2C EEPROMJRC4558dual op-ampAlso from the pinout (I2C and crystal), package, and likely function, I've identified the QFN48 as probably eitherWS9621,WS9622, or a similar series of bluetooth SoCs. It's the only ones I could find with the I2C (for EEPROM, as the datasheet says) on 22/23 and crystal on 39/40. Erasing the markings didn't help them hide anything...Now can anyone can figure out what the other QFP48 is?

author: Skappy
author_rank: Contributor
timestamp: July 21, 2014, 07:18:13 am
content: Dear Amyk,Thank you very much for the help ...Before starting to investigate, do you think that all the listed components must be removed from the pcb when testing ?I do not have hot air desoldering station but can consider buying one if need beThank you very much for your kindness Amyk,Have a nice daySkappy