Sharp LC32SB27U - LC - 32" LCD TV Service Manual page 53

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 (VIDEO) at pin (19) of tuner
(TU1101)?
Check TU1101 and its peripheral circuits
(TUN_SDA_C5: Pin8 of TU1101, TUN_SCL_C5: Pin9
of TU1101, etc.).
YES
Is there the analog video signal input at pin (B11) of IC8001
(CPU)?
Check the line between IC8001 and TU1101, and their
peripheral circuits.
YES
Are the LVDS signal outputs at the LVDS 1st channel and 2nd channel of IC8001?
LV0OUT0P/M (N19/N20), LV0OUT1P/M (N21/N22),
LV0OUT2P/M (P19/P20), LV0OUT3P/M (R19/R20),
LV0CK0P/M (P21/P22)
YES
Check the panel module.
PC: No external input video [INPUT-4]
Is INPUT-4 selected on the input select menu screen?
Select INPUT-4 on the input select menu screen for
the right input signal.
Is IC602 (EEPROM) accessed by I2C, with PC con-
nected, to read the DDC_I2C DSUB_SCL/
DSUB_SDA data?
Check the DDC line and its peripheral circuits.
(IC602 and its peripherals).
YES
Are there the video signal inputs at pins (B12) (G), (A9) (B) and
(A6) (R) of IC8001 (CPU)?
Are there the VSYNC/HSYNC signal inputs at pins (B16) and
(B17) of IC8001?
YES
Are the LVDS signal outputs at the LVDS 1st channel and 2nd
channel of IC8001?
LV0OUT0P/M (N19/N20), LV0OUT1P/M (N21/N22),
LV0OUT2P/M (P19/P20), LV0OUT3P/M (R19/R20),
LV0CK0P/M (P21/P22)
YES
Check the panel module.
No video (4)
NO
NO
No video (5)
NO
LC-32D47U/LC-32SB27U/LC-C3237U
No video at digital broadcast signal reception
Are there the video signal outputs (IF_P/N) at the pins (12) and (13) of
tuner (TU1101)?
Check TU1101 and its peripheral circuits (TUN_SDA_C5: Pin8
of TU1101, TUN_SCL_C5: Pin9 of TU1101, etc.).
YES
Are there the video signal inputs at pin (A4) and (B4) of IC8001 (CPU)?
Check the line between IC8001 and TU1101, and their periph-
eral circuits (C1125/C1126, etc.).
YES
NO Check IC8001 and its peripheral circuits.
(IC8251, etc.)
NO Check the line between SC601 and IC8001 (IC601, etc.).
NO Check IC8001 and its peripheral circuits. (IC8251, etc.)
6 – 3
NO
NO