Taito F3 DAC/Sound problem

[theangel540]

Hello.
I am looking for a charitable soul who could help me on a working F3.
So I have an F3 PCB single which has no sound.
I diagnosed a problem on the TDA1543 DAC.
My bitclock signal is bad.
I traced it to below the Custom TC0660CFM.
Unable to see under the component where the pad loops.

(when I pass my moistened finger over pin 1,2 and 3 of the DAC, I have sound that comes back slightly... I have to pair the serial PIN3 with my PIN1 this way!)

So you would have to either:
- that I unsolder the qfp in question at the station
- that a person with a functional F3 trace me the PIN1 of the TDA on one of the legs of the custom QFP. (what leg? it seems that everything goes through this QFP between the ensoniq chipset and the Ana./digital volume/amp part.)

I think I have:
- or an HS pass-through pad under the QFP.
- either my DAC which layers my signal.

Either way, I HAVE to be able to trace the PIN1 somewhere and it stops...under the custom.
The DAC is right next to the radia.

A BIG thank you in advance for someone equipped with a multimeter and an F3 (mobo or single pcb) who can do this for me. (with a small caliber ~ 200ohms so as not to damage anything).

 

[theangel540]

I put you some pictures of my F3 single.
The PIN1 of my TDA1543 DAC has a bad pulse which is not at standard TTL levels.
PIN3 is OK.

So I would like to trace the PIN1 from it to the QFP TAITO TC0660FCM.


The DAC (with my screwdriver pointing to PIN1):

The PIN3 of this one which is all normal:

The PIN1 of this one which is bad (DAC or trace HS):

The Custom/QFP TAITO TC0660CFM which must output to me (it would seem) the signal of the PIN1 of the DAC (bitclock...clock of the DAC in fact):

On the other hand, where/which leg of this component?
Impossible to find with my multi. I therefore think of a cut trace or else the PIN1 goes elsewhere.
I was only able to trace the line of this PIN to below the QFP. It is through and therefore below the component.
Impossible to know where it is going

F3 singles are laid out a bit differently than mobos.

 

[theangel540]

Fixed!

The Bitlock singal for DAC is outputed at PIN 49 of the Custom TC0660!

Juste need to put a fresh new DAC