Audio circuit (1) no sound in ee mode, 2) no sound in pb mode – LG TL-AT130M User Manual

Page 19

Advertising
background image

3-9

SECTION3 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

4. AUDIO CIRCUIT

(1) No sound in EE Mode

Is the Audio signal applied to the

IC301 Pin 76?

NO

NO

Check the path of

LINE/AUDIO.

Check the IC501 Pin 2.

(Audio Mute "H".)

Check the IC501 Pin18(CLK),

17(Data) Line.

Does the CLK/Data signal(I

2

C)

appear at the IC301 Pin 23, 24?

No sound in EE Mode.

No sound.

YES

Is 5V applied to the IC301

Pin 75?

YES

Check the line of the 5V Line.

(Power Circuit)

YES

YES

Is the Audio Mute "High" signal applied

to the IC301 Pin 10?

Check the connection of the Audio

out Jack.

NO

NO

NO

YES

Does the Audio signal appear

at the IC301 Pin 96?

YES

Replace the IC301

YES

YES

(2) No sound in PB MODE

Does the CLK/Data signal(I

2

C)

appear at the IC301 Pin 23, 24?

NO

NO

Check the IC501 Pin 18(CLK),

17(Data) Line.

Is the Audio Mute "H" applied to

the IC301 Pin 10?

No sound in PB Mode.

No sound.

YES

Is 5V applied to the

IC301 Pin 75?

YES

Check the line of the 5V Line.

(Power Circuit)

YES

NO

Check the connecting State between

the P3D02 Pin 6 and A/C Head.

Does the Audio signal appear

at the IC301 Pin 96?

NO

YES

Does the Audio signal appear

at the IC301 Pin 1?

YES

YES

NO

Replace the IC301

Check the IC501 Pin2.

YES

Advertising