Mazda 6 Bose amp fault

**teerak2uk** · 30th April, 2018, 07:48 PM

not radio code but radio related .

Does anyone know the cause of the machine gun sound that the amp produces when faulty

regards

**gapco** · 1st May, 2018, 04:03 PM

The solution for the amplifier. Tell us if this worked.

Mazda 6 Bose amplifier.JPG

**badne55** · 1st May, 2018, 05:29 PM

boserepairexperts.eu

**teerak2uk** · 1st May, 2018, 05:41 PM

Originally Posted by badne55

boserepairexperts.eu

Thanks but trying to repair it for a friend so want to keep the costs down

**teerak2uk** · 28th May, 2018, 02:12 PM

Originally Posted by gapco

The solution for the amplifier. Tell us if this worked.

Mazda 6 Bose amplifier.JPG

Just changed the larger chip but unfortunately have no sound now

**gapco** · 28th May, 2018, 03:32 PM

Refer to my notes and replace both components.

**teerak2uk** · 28th May, 2018, 04:29 PM

Originally Posted by gapco

Refer to my notes and replace both components.

yes still waiting for the part to come but was curious why machine gun sound but no sound at all after changing only 1 of the chips

**attilaa0** · 28th May, 2018, 07:34 PM

Look here :measuring this voltages,If stabilizer ST2L05-3300 ( 1,25V ) not working good ,it can destroy the DSP.
If the stabilizer is changed and the DSP also changed ,and still not working then must change the CS42438 also.
You can visualized the stabilizer voltage with oscilloscope.
Send us results.

**gapco** · 28th May, 2018, 07:47 PM

Originally Posted by teerak2uk

yes still waiting for the there art to come but was curious why machine gun sound but no sound at all after changing only 1 of the chips

Attilla0 has replied with good information. I suggest you buy another DSP chip as you probably damaged it.

**attilaa0** · 28th May, 2018, 08:10 PM

First change the stabilizer and do not solder the DSP,check the voltages 1,25V and 3,3V also and check also with oscilloscope ,the line must be stable without any noise when visulizing with scope,if it's ok only after that solder the new DSP.And if still not work then change the CS42438.

**bidu20** · 25th June, 2018, 10:58 AM

i repaired one with no tone. the solution from attilaa0 works. I replaced all 3 components

**impolis** · 24th July, 2018, 03:17 PM

Hi everybody! Can you plz share a dump for 24LC256? my amp's DSP does restart 13 times a second, because DSP issues no watchdog signal to voltage regulator, thus the regulator forces reset. I had a look at EEPROM and there were almost only FF's, and, because DSP starts from EEPROM, I'm sure the dump might be damaged.

**attilaa0** · 24th July, 2018, 08:54 PM

Hi!I don't know what model you have,i have 2 different dump.Trie it and send me result.

**rainy1505** · 20th June, 2019, 10:35 AM

Hello guys, I have the same problem as OP. I wanted to order replacement chips, but the ones I find on eBay/AliExpress are with different numbers. But does it even matter? Please see image.

20190609_183050.jpg ic.jpg

**attilaa0** · 20th June, 2019, 07:15 PM

Originally Posted by rainy1505

Hello guys, I have the same problem as OP. I wanted to order replacement chips, but the ones I find on eBay/AliExpress are with different numbers. But does it even matter? Please see image.

20190609_183050.jpg ic.jpg

Hi!You can order ,it matter only ST2L05-3300 .(9Y 743 not matter)
CS42438 is the other chip =(can't read anything from this)
DSPB56374AE or SCB56374AEB is same