hello.
my Cambridge audio minx Go speaker no longer lights up.
the battery is well charged it gives 11v
if i stay press the power button there is just the red led that lights up behind and as soon as i release the button the led goes off.
It stopped automatically by itself after 30 min and does not light up.
No service manual.
Reset,I don't know how......
All chemical caps tested ok.
my Cambridge audio minx Go speaker no longer lights up.
the battery is well charged it gives 11v
if i stay press the power button there is just the red led that lights up behind and as soon as i release the button the led goes off.
It stopped automatically by itself after 30 min and does not light up.
No service manual.
Reset,I don't know how......
All chemical caps tested ok.
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It appears to be LiIon, so 3S? A 3S lithium pack fully charged is more like 12.6V, 11V suggests its not charging. How did you measure that voltage BTW? Seven years is quite a long time. Open it up and see if the battery pack can be changed?
I disconnected the battery and I tested with 11v AC adapter,no power.Only red led .
This is service manual.
https://mega.nz/#!hXxnlSSK!Dz2ia4g7Rl3mpjt81bQSIGvFmKFDk6KGrTPR7hHABTs
This is service manual.
https://mega.nz/#!hXxnlSSK!Dz2ia4g7Rl3mpjt81bQSIGvFmKFDk6KGrTPR7hHABTs
Bwahaha, a 2013 portable Bluetooth speaker and it uses 4558 opamps. Sorry, I just found that combination rather amusing. And there's a zener follower regulator for their +7.5 V supply to boot. Oldschool. But it's cool to see some service docs for stuff like that for once.
Anyway, the external power supply input clearly says DC 16 V / 1.8 A. Have you been able to test that? (I imagine a 15 V supply would also be OK. CN901 on the board.)
If that doesn't work either, I would direct my attention to the area of the auto power down IC in the BT section (IC601 on schematic page 2). This is the guy that controls the red LED. Maybe it thinks there is no voltage? Check that C607 isn't shorted by any chance. (Ditto for C620, C621 just in case.)
Just to be sure, check +3.3 V at R612, both ends about the same, and that the resistor still measures 10 ohms. Probably all the case, the IC seems to be alive after all. And if BT+3.3 V is there, the BT+5V it is derived from should also be.
This comes from the IC901 area (#3).
When you plug in external power, USB+5V should be turned on. Could you test that?
If the battery sits there at 11 V, the question is whether the charge controller (IC903) starts doing its thing when external power is plugged in (voltage at R926). It would also be interesting to know what battery voltage is doing on attempted turn-on - if it collapses to <9 V, there's probably a cell that's toast.
Anyway, the external power supply input clearly says DC 16 V / 1.8 A. Have you been able to test that? (I imagine a 15 V supply would also be OK. CN901 on the board.)
If that doesn't work either, I would direct my attention to the area of the auto power down IC in the BT section (IC601 on schematic page 2). This is the guy that controls the red LED. Maybe it thinks there is no voltage? Check that C607 isn't shorted by any chance. (Ditto for C620, C621 just in case.)
Just to be sure, check +3.3 V at R612, both ends about the same, and that the resistor still measures 10 ohms. Probably all the case, the IC seems to be alive after all. And if BT+3.3 V is there, the BT+5V it is derived from should also be.
This comes from the IC901 area (#3).
When you plug in external power, USB+5V should be turned on. Could you test that?
If the battery sits there at 11 V, the question is whether the charge controller (IC903) starts doing its thing when external power is plugged in (voltage at R926). It would also be interesting to know what battery voltage is doing on attempted turn-on - if it collapses to <9 V, there's probably a cell that's toast.
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So glad I found this topic. I have the same issue and I've spend lots of time to find the issue without luck. My suspision has been as well this IC601. Is there a way to jump or bypass this to test whether this IC601 is the issue? Only differences to Lynyrd case is that leds lit when I press the power button.
R612 measures ~3.3V when the power button is pressed. No shorted caps around it.
Also I've been looking where to buy the IC601 which seems to be SC51P0304SA1, but I haven't found any place. @Lynyrd would you mind sharing where you found the chip or better, bought any extra willing to sell? Did you had to reprogram it or is it even programmable microcontroller?
Thank you in advance.
R612 measures ~3.3V when the power button is pressed. No shorted caps around it.
Also I've been looking where to buy the IC601 which seems to be SC51P0304SA1, but I haven't found any place. @Lynyrd would you mind sharing where you found the chip or better, bought any extra willing to sell? Did you had to reprogram it or is it even programmable microcontroller?
Thank you in advance.
Sorry, shouldn't write in a hurry. Unfortunately I'm not able to modify the previous message. I meant to say that different from Lynyrd case is that no leds lit when I press the power button. Measured also that the PAM8620 does receive 5V and the battery voltage when the power button is pressed, but those voltages are removed when the button is released. When I connect the charger, I get the jack board CN611 red led illuminated. IC901 generates 5V. I recall that the device worked correctly and was turned off from the power button. However it never turned on after that.
I managed to source those IC601 SC51P0304SA1 and after replacing it, the behaviour is exactly like in Lynyrd's first post. When I press the power button, the red gets lit but immediately relasing the power button goes off. 😢
Anything else I could maybe check?
Anything else I could maybe check?
I made a jumper cable from 3v3 to the bluetooth module pin 22 which is the P_CTRL and should force the BT on. After the jumper when I press the power button, the red led will get lit and stay lit. Blue led which is controlled by the BT module wont turn on. When looking at the CSR8645 bluetooth module by thermal camera, I see it heats up and cools down in few second intervals. I assume the bluetooth chip is dead or firmware corrupted.
I think this is dead end. If I can find somewhere this BT module, I'm not able to get the firmware to it. I see there is reservation for programming connector on the PCB so it could be updated if one could find the correct firmware.
Or would generic CSR8645 audio module from AE work if take the IC from there? Or is there any other possibilities?
I think this is dead end. If I can find somewhere this BT module, I'm not able to get the firmware to it. I see there is reservation for programming connector on the PCB so it could be updated if one could find the correct firmware.
Or would generic CSR8645 audio module from AE work if take the IC from there? Or is there any other possibilities?