Sharp LC-37GP1U Service Manual page 35

No video at UHF/VHF broadcast signal reception
Is the specified TV signal selected on the input select menu screen?
Is there the analog video
signal output at the output
pin (13) of tuner (TU1101)?
YES
Is there the video signal out-
put at pin (5) of IC1103
(LEVEL_ADJ)?
YES
Is there the CVBS3 signal
input at pin (N3) of IC3301
(VPC)?
YES
Is there the LVDS signal output at the LVDS 1st channel and 2nd channel of IC3301?
TA2_P/M (AJ30/AK30), TB2_P/M (AJ29/AK29), TC2_P/M (AJ28/AK28), TD2_P/M (AJ26/AK26), TE2_P/M (AJ25/AK25), TCLK2_P/M (AJ27/
AK27), TA1_P/M (AB29/AB30), TB1_P/M (AC29/AC30), TC1_P/M (AD29/AD30), TD1_P/M (AF29/AF30), TE1_P/M (AG29/AG30), TCLK1_P/M
(AE29/AE30)
Check the panel module.
NO Check the tuner, IC8601
(DE-MODULATOR) and
their peripheral circuits
(TUN_SDA/SCL, Q8601).
NO Does the level adjustment
control signal come from pin
(6) of IC1103 to pin (1) of
IC1104?
NO
Check IC1104 and its
peripheral circuits. Replace
as required.
NO Check the line between
IC1103 and IC3301 (Q2204,
Q2208, etc.).
YES
No video (3)
No video at digital broadcast signal reception
Is there the video signal out-
put at the output pins (20)
and (21) of tuner (TU1101)?
YES
Are there the MPEG signal
outputs (US_TS_PKTSYNC,
US_TS_EN, US_TS_DATA,
US_TS_CLK) from IC8601?
YES
Are there the MPEG signal
inputs (US_TS_PKTSYNC,
US_TS_EN, US_TS_DATA,
US_TS_CLK) at IC8101
(CPU/DECODER)?
YES
Are there the MVY [7:0],
MVC [7:0] and MVCLKO/
MNSYNCO/MVSYNCO sig-
nal outputs from IC8101?
YES
Are there the MVY [7:0],
MVC [7:0] and MVCLKO/
MNSYNCO/MVSYNCO sig-
nal inputs at IC3301?
YES
Check IC3301 and its peripheral control circuits (IC3501, IC3502,
IC8101, etc.).
6 – 3
LC-32GP1U/LC-37GP1U 1st
NO Check the tuner, IC8601
(DE-MODULATOR) and
their peripheral circuits
(TUN_SDA/SCL, Q8601).
NO Check IC8601 and its
peripheral control circuits.
NO Check the line between
IC8601 and IC8101.
NO Check IC8101 and its
peripheral circuits.
NO Check the line between
IC8101 and IC3301.
NO