Sharp LC32SB27U Service Manual - Page 53

LV0OUT0P/M N19/N20, LV0OUT1P/M N21/N22

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Page 53 highlights

No video (4) LC-32D47U/LC-32SB27U/LC-C3237U No video at UHF/VHF broadcast signal reception No video at digital 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)? Are there the video signal outputs (IF_P/N) at the pins (12) and (13) of tuner (TU1101)? NO YES Check TU1101 and its peripheral circuits (TUN_SDA_C5: Pin8 of TU1101, TUN_SCL_C5: Pin9 of TU1101, etc.). Is there the analog video signal input at pin (B11) of IC8001 (CPU)? NO 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)? YES NO Check the line between IC8001 and TU1101, and their peripheral circuits. YES NO Check the line between IC8001 and TU1101, and their peripheral circuits (C1125/C1126, etc.). Are the LVDS signal outputs at the LVDS 1st channel and 2nd channel of IC8001? NO Check IC8001 and its peripheral circuits. LV0OUT0P/M (N19/N20), LV0OUT1P/M (N21/N22), (IC8251, etc.) LV0OUT2P/M (P19/P20), LV0OUT3P/M (R19/R20), LV0CK0P/M (P21/P22) YES Check the panel module. No video (5) PC: No external input video [INPUT-4] Is INPUT-4 selected on the input select menu screen? NO Select INPUT-4 on the input select menu screen for the right input signal. Is IC602 (EEPROM) accessed by I2C, with PC connected, 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 Check the line between SC601 and IC8001 (IC601, etc.). NO Check IC8001 and its peripheral circuits. (IC8251, etc.) 6 - 3

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LC-32D47U/LC-32SB27U/LC-C3237U
6 – 3
No video (4)
No video at UHF/VHF broadcast signal reception
No video at digital 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)?
Are there the video signal outputs (IF_P/N) at the pins (12) and (13) of
tuner (TU1101)?
YES
NO
YES
NO
Check TU1101 and its peripheral circuits
(TUN_SDA_C5: Pin8 of TU1101, TUN_SCL_C5: Pin9
of TU1101, etc.).
Check TU1101 and its peripheral circuits (TUN_SDA_C5: Pin8
of TU1101, TUN_SCL_C5: Pin9 of TU1101, etc.).
Is there the analog video signal input at pin (B11) of IC8001
(CPU)?
Are there the video signal inputs at pin (A4) and (B4) of IC8001 (CPU)?
YES
NO
YES
NO
Check the line between IC8001 and TU1101, and their
peripheral circuits.
Check the line between IC8001 and TU1101, and their periph-
eral circuits (C1125/C1126, etc.).
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)
NO
Check IC8001 and its peripheral circuits.
(IC8251, etc.)
YES
Check the panel module.
No video (5)
PC: No external input video [INPUT-4]
Is INPUT-4 selected on the input select menu screen?
YES
NO
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).
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?
NO
Check the line between SC601 and IC8001 (IC601, etc.).
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)
NO
Check IC8001 and its peripheral circuits. (IC8251, etc.)
YES
Check the panel module.