820-00840 no sound ( no input / output )

[Yoel Ren]

i see a little bit of liquid on u6200.
L83 vp is short to ground too. so I changed both u6200 and u6300 from 00239 board.
I have probe nothing is short surrounding u6200 and u6300, but theres still no sound. no input output detected at all..
please help guide me for measurement.. thanks..

 

[2informaticos]

Is the audio codec detected in System Report?

 

[Yoel Ren]

at the hardware tab : audio
Devices : ...
nothing shows. I assume codec is not detected then.

 

[2informaticos]

Check all power rails of audio codec.

 

[Yoel Ren]

i assume power is from pp1v8_s0, present on c6203.
c6000 supply cs8409_Va_pll 1.4v

 

[2informaticos]

U6200 is a bridge between PCH and audio codec (U6300).
Check U6360 and the small coils from power rails of U6300.

 

[Yoel Ren]

u6360 is outputting l83_1v8 , 1.8v.
both coil L6301 and and L6300 is transmitting correct 1.8v.

 

[2informaticos]

What about L6302???

 

[Yoel Ren]

theres 3.3v at both end of L6302. so good.

 

[2informaticos]

Check the resistors between U6200 and PCH.
Also check reset signals for U6200/300.

Be sure you've got good solders.
You should try chips from same donor board model.

 

[Yoel Ren]

r1300-1303 is all good according to spec. 33 ohm.
hda_rst_l 1.8v
codec_rst_l 0v
r6204 is good.

 

[Yoel Ren]

solved : u6200/300 is replaced from same board model.
maybe my donor is broken..
thanks for the help!