Korg i3 keyboard no sound out

Step 1:
Check the setting of LOCAL CONTROL in GLOBAL mode.
Go to GLOBAL mode page 1 (Figure 1-2):

Move the cursor from the MASTER TUNE to LOCAL CONTROL. Setting LocalControl should be in the ON position.
When the setting is OFF,set it to ON (use dial TEMPO / VALUE or DOWN / UP button).
Go back to ARR or PROG mode,and play the key to check audio.

Step 2:
If in step 1, the sound still does not exist, then it is a hardware problems, and the possibilities are :
Figure 3, the section in red shading is a block may be damaged.

Figure 4 is a scheme.korg i3 keyboard no sound out - korg-i3-keyboard-no-sound-out-fuxmm42irvf2p03kxwfdv02c-5-6.jpg42irvf2p03kxwfdv02c-5-6.jpg" alt="korg-i3-keyboard-no-sound-out-fuxmm42irvf2p03kxwfdv02c-5-6.jpg" class="h_mi" />Parts that might be damaged in case of no-audio are:
IC 2,4,5 (4570), IC9 (78L05), IC6 (PCM69AU), IC 3 (5216).
Check also the transistors Q1-Q7 (This is the MUTE transistor, and this is most often the cause in case of no-audio).
If you can not fix it by yourself, then leave it to the experts.
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