Macbook A2337 Right Speaker Not Working

[Instafixx]

Hello,
Right speaker not working.
Change Speaker . Small Audio Board . The Flex.

Still not working.
No signs of corrosion on the board.

 

[2informaticos]

Check UR930/40 and adjacent components.
Compare readings with UR900/10 area.

 

[Instafixx]

Check UR930/40 and adjacent components.
Compare readings with UR900/10 area.

Everything seems fine here.

 

[Instafixx]

While Comparing Diode Mode Readings - there are 2 different Lines with SPKRAMP_R and SPKRAMP_L.

All rails have similar reading except :

TDM_1V8_SPKRAMP_L_D2R is .450
TDM_1V8_SPKRAMP_R_D2R is .600

 

[2informaticos]

The higher value corresponds to right audio channel.
You must audio board connected, for comparison.

Do you get correct sound on headphones?
What the client said about how the problem appeared?

 

[Instafixx]

With Audio board connected readings are same.
I get sound via headphones.
Power Button Works but fingerprint is failed.

Customer said he got it motherboard repaired from some shop.

I see work done on U8100.

 

[2informaticos]

Are you sure all resistors and traces near UR930/40 are good?
You can try changing UR940.

 

[Instafixx]

Replaced UR940. Same.

Should we check resistance between pins of all resistors? what should be considered a out of range value ?

 

[2informaticos]

All resistors should be 33 ohm; easy to check onboard.
Doesn't matter if you get 30-36 ohm readings; but no open.

 

[Instafixx]

R2162/3/4 is 20 ohms.

Rest all resistors are within range.

Replaced UR930 but still same value.

 

[Instafixx]

Hello,Kindly revert

 

[2informaticos]

Did you check the resistors from page 73?

Check connections between audio board and UR930/40.

 

[Instafixx]

CR930 -2.2K ohms
CR931 - 21.97 K OHMS

RR940 and RR910 are 36 Ohms
RR930/1/2 are 34 Ohms

 

[2informaticos]

CRx stands for capacitors.
No reason to check resistance there.

"Check connections between audio board and UR930/40."
You may have problems with audio flex, or connectors.

 

[Instafixx]

How do i check the connection between the board and the ic.

I did change the flex and i/o board

 

[2informaticos]

Buzzer mode???

 

[Instafixx]

I found nothing. Returning it to the customer.
After putting the board back i see a round circle with an exclamation mark. What do i do now?

Device isnt detecting in DFU Mode. I tried the key combination method and the jumper method too.

I am stuck. Require immediate assistance

Tried with Power Button / Audio Board / Battery / Display Removed as well

 

[2informaticos]

DFU Mode Restore (Macs) - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

logi.wiki

To discard an issue with touch ID, disconnect audio flex and use a switch over SWV012 too.
Playing with both switches, you should bring the machine into DFU.

 

[Instafixx]

I ll connect one switch to Rv020 Pad 1 and Another to SWV012 pad 2 right ?

 

[Instafixx]

I have connected the switches but its till the same. I think the machine goes into dfu as the trackpad stops clicking , but it doesnt detect.
Connected to the port closest to the screen. tried different cables as well.

SOC_DFU_STATUS is 1.2V

Tried a different Host Mac as well.