LC-46DH77E (serv.man5). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 4

LC-42DH77E/RU/S/V, LC-46DH77E/RU/S/V

4 – 4

                                             
Is there a audio output signal in pins (3/L-ch) and (1/R-ch) of 
EXT1 (SC502)?

YES

Check the setting of an external input device that connects with 
EXT1.

Is there a audio output signal in pins (3/L-ch) and (1/R-ch) of 
EXT2 (SC501)?

YES

Check the setting of an external input device that connects with 
EXT2.

NO

<EXT1>
Is SC-MUTE [pin (67) of IC9101 (CPLD)] at H?

YES

Check the peripheral circuits of IC9101 and SC-MUTE.
(Q503, Q505, etc.)

<EXT2>
Is SC2-MUTE [pin (65) of IC9101 (CPLD)] at H?

YES

Check the peripheral circuits of IC9101 and SC2-MUTE.
(Q502, Q504, etc.)

NO

<EXT1>
Is there a audio output signal in pins (39/SC1_OUT_L) and (38/
SC1_OUT_R) of IC503 (AV_SW)?

YES

Check the line between IC503 and SC502.

<EXT2>
Is there a audio output signal in pins (37/SC2_OUT_L) and (36/
SC2_OUT_R) of IC503 (AV_SW)?

YES

Check the line between IC503 and SC501.

NO

<EXT1> When the HDMI signal
Is there a audio input signal in pins (60/L1) and (59/R1) of IC503 
(AV_SW)?

YES

Check IC503 and its peripheral circuits.

<EXT2> When the HDMI signal
Is there a audio input signal in pins (58/L2) and (57/R2) of IC503 
(AV_SW)?
When the DTV (H.264) signal
Is there a audio input signal in pins (44/L9) and (43/R9) of IC503 
(AV_SW)?

NO

<EXT1> When the HDMI signal
Is there a audio output signal in pins (1/OUTTNL) and (2/OUT-
TNR) of IC1302 (DSP)?

YES

Check the line between IC1302 and IC503.

<EXT2> When the HDMI signal
Is there a audio output signal in pins (17/OUT2L) and (18/
OUT2R) of IC1302 (DSP)?
When the DTV(H.264) signal
Is there a audio input signal in pins (11/AOUT_L) and (10/
AOUT_R) of IC504 (AUDIO_DAC)?

YES

Check the line between IC504 and IC503.

NO

When the HDMI signal
Is there signal of HDMI_SD0/WS/SCK input to pin (76, 77, 78) of 
IC1302?

YES

Check IC1302 and its peripheral circuits.

When the DTV (H.264) signal
Is H.264_I2S signal input to pin (13/H.264_I2S_MCLK), (3/
H.264_I2S_SCLK), (6/H.264_I2S_LRCLK) and (10/
H.264_I2S_DATA) of IC1306 (SW.)?

YES

Check IC1306, IC504 and its peripheral circuits

NO

When the HDMI signal
Is there signal of HDMI_SD0/WS/SCK output to pin (C10, E10, 
D10) of IC8101 (DIGITAL AV DECODER & MAIN CPU & VIDEO 
PROCESSER)?

NO

Check IC8101 and its peripheral circuits.

When the DTV(H.264) signal
Is H.264_I2S signal output from pin (D26/H.264_I2S_MCLK), 
(E24/H.264_I2S_SCLK), (E26/H.264_I2S_LRCLK) and (A25/
H.264_I2S_DATA) of IC5001 (H.264_DECODER)?

NO

Check IC5001 and its peripheral circuits.