Sharp LC32SB27U Service Manual - Page 54

Check the HDMI_DDC_SDA_IN2, HDMI_DDC_SCL_IN2 line

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Page 54 highlights

LC-32D47U/LC-32SB27U/LC-C3237U No video (6)-1 HDMI: No external input video [INPUT-5] HDMI: No external input video [INPUT-6] Is INPUT-5 selected on the input select menu screen? Is INPUT-6 selected on the input select menu screen? NO YES Select INPUT-5 on the input select menu screen for the right input signal. Does the HOT PLUG detection function? Does the DDC5V signal come from pin (18) of SC1603 to pin (42) of IC1609 (HDMI_SW)? NO YES Select INPUT-6 on the input select menu screen for the right input signal. Does the HOT PLUG detection function? Does the DDC5V signal come from pin (18) of SC1602 to pin (36) of IC1609 (HDMI_SW)? NO Check the line between the input terminals of SC1603 and IC1609. Check IC1609 and its peripheral circuits (I2C_SDA: pin53 of IC1609/I2C_SCL: pin54 of IC1609, etc.). NO Check the line between the input terminals of SC1602 and IC1609. Check IC1609 and its peripheral circuits (I2C_SDA: pin53 of IC1609/I2C_SCL: pin54 of IC1609, etc.). YES Does the HPD signal come from pin (41) of IC1609 to pin (19) of SC1603? YES Does the HPD signal come from pin (35) of IC1609 to pin (19) of SC1602? NO Check the line between the pin (41) of IC1609 and the pin (19) of SC1603. Check IC1609 and its peripheral circuits (I2C_SDA: pin53 of IC1609/I2C_SCL: pin54 of IC1609, etc.). NO Check the line between the pin (35) of IC1609 and the pin (19) of SC1602. Check IC1609 and its peripheral circuits (I2C_SDA: pin53 of IC1609/I2C_SCL: pin54 of IC1609, etc.). YES Are there the TMDS signal inputs at pins (11/12) (CLK-/+), (13/14) (D0-/+), (15/16) (D1-/+), (17/18) (D2-/+), all of IC1609? YES Are there the TMDS signal inputs at pins (1/2) (CLK-/+), (3/4) (D0-/+), (5/6) (D1-/+), (7/8) (D2-/+), all of IC1609? NO Is IC1609 (pin39/pin40) accessed by I2C, with HDMI connected, to read the DDC_I2C SCL/SDA data? NO Is IC1609 (pin33/pin34) accessed by I2C, with HDMI connected, to read the DDC_I2C SCL/SDA data? NO YES Check the HDMI_DDC_SDA_IN3, HDMI_DDC_SCL_IN3 line and its peripheral circuits. (IC1609 and its peripherals). YES Are there the TMDS signal inputs at pins (F20/F19) (CLK-/+), (E21/E20) (D0-/+), (D22/D21) (D1-/+), (C22/C21) (D2-/+), all of IC8001 (CPU)? NO Check the HDMI_DDC_SDA_IN2, HDMI_DDC_SCL_IN2 line and its peripheral circuits. (IC1609 and its peripherals). NO Check IC1609, IC8001 and their peripheral cir- cuits. YES 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. 6 - 4

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LC-32D47U/LC-32SB27U/LC-C3237U
6 – 4
<HDMI input> No video (6)-1
HDMI: No external input video [INPUT-5]
HDMI: No external input video [INPUT-6]
Is INPUT-5 selected on the input select menu screen?
Is INPUT-6 selected on the input select menu screen?
YES
NO
YES
NO
Select INPUT-5 on the input select menu screen for
the right input signal.
Select INPUT-6 on the input select menu screen for the right
input signal.
Does the HOT PLUG detection function?
Does the HOT PLUG detection function?
Does the DDC5V signal come from pin (18) of SC1603 to pin (42)
of IC1609 (HDMI_SW)?
Does the DDC5V signal come from pin (18) of SC1602 to pin (36) of
IC1609 (HDMI_SW)?
YES
NO
YES
NO
Check the line between the input terminals of SC1603
and IC1609.
Check the line between the input terminals of SC1602 and
IC1609.
Check IC1609 and its peripheral circuits (I2C_SDA:
pin53 of IC1609/I2C_SCL: pin54 of IC1609, etc.).
Check IC1609 and its peripheral circuits (I2C_SDA: pin53 of
IC1609/I2C_SCL: pin54 of IC1609, etc.).
Does the HPD signal come from pin (41) of IC1609 to pin (19) of
SC1603?
Does the HPD signal come from pin (35) of IC1609 to pin (19) of SC1602?
YES
NO
YES
NO
Check the line between the pin (41) of IC1609 and the
pin (19) of SC1603.
Check the line between the pin (35) of IC1609 and the pin (19)
of SC1602.
Check IC1609 and its peripheral circuits (I2C_SDA:
pin53 of IC1609/I2C_SCL: pin54 of IC1609, etc.).
Check IC1609 and its peripheral circuits (I2C_SDA: pin53 of
IC1609/I2C_SCL: pin54 of IC1609, etc.).
Are there the TMDS signal inputs at pins (11/12) (CLK-/+), (13/14)
(D0-/+), (15/16) (D1-/+), (17/18) (D2-/+), all of IC1609?
Are there the TMDS signal inputs at pins (1/2) (CLK-/+), (3/4) (D0-/+), (5/6)
(D1-/+), (7/8) (D2-/+), all of IC1609?
YES
NO
YES
NO
Is IC1609 (pin39/pin40) accessed by I2C, with HDMI
connected, to read the DDC_I2C SCL/SDA data?
Is IC1609 (pin33/pin34) accessed by I2C, with HDMI con-
nected, to read the DDC_I2C SCL/SDA data?
NO
NO
Check the HDMI_DDC_SDA_IN3,
HDMI_DDC_SCL_IN3 line and its peripheral circuits.
(IC1609 and its peripherals).
Check the HDMI_DDC_SDA_IN2, HDMI_DDC_SCL_IN2 line
and its peripheral circuits.
(IC1609 and its peripherals).
Are there the TMDS signal inputs at pins (F20/F19) (CLK-/+), (E21/E20) (D0-/+),
(D22/D21) (D1-/+), (C22/C21) (D2-/+), all of IC8001 (CPU)?
NO
Check IC1609, IC8001 and their peripheral cir-
cuits.
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.