Sharp LC-42LD266K (serv.man3) Service Manual ▷ View online
49
LC-42LD264
LC-42LD265
LC-42LD266
LC-42LD265
LC-42LD266
No picture on the display (1)
The picture doesn't appear in all modes.
MAIN UNIT:
YES
YES
PANEL_UNIT:
YES
YES
No picture on the display (2)
Does not the picture come out when TV is received?
TERMINAL UNIT:
YES
MAIN_UNIT:
YES
YES
<External input (Component)>No picture on the display (3)
Does not the picture of the component video signal input to Component go out?
TERMINAL_UNIT:
MAIN_UNIT:
YES
YES
Is LCD controller's control signal normal?
Check the line between IC U401 and CN408.
NO
Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
PANEL_VCC, and it peels off and whether normality is checked.
PANEL_VCC, and it peels off and whether normality is checked.
Check the panel module.
Similarly, is the LVDS signal input to connector of the panel
module?
module?
NO
Wire harness is checked. (Main board to Panel module )
Is LVDS signal output from 1st_channel and 2nd_channel of IC
U401 in each mode?
U401 in each mode?
Check IC U401 and its peripheral control circuits.
Is DIF signal output from pin (5/6) of TUNER (TU101) to pin
(Y19/W18) of IC U401?
(Y19/W18) of IC U401?
Is the voltage of regulation for a TUNER circuit and the power
supply terminal of IC U401 supplied?
supply terminal of IC U401 supplied?
NO
Each power supply circuit is checked.
NO
Check the tuner, IC U401 and their peripheral circuits. Replace
as required.
as required.
NO
Do X401 (24MHz) oscillate?
Check X401 and its peripheral circuits.
Refer to The picture doesn't appear in all modes.
NO
Is Component Y/Pb/Pr signal sent to pin (2)/ Y_IN_1, (4)/ PB_IN_1,
(7)/ PR_IN_1 of AV1(CN116) ?
(7)/ PR_IN_1 of AV1(CN116) ?
Check the setting of an external input device that connects of
CN116.
CN116.
Is Component Y/Pb/Pr signal sent to pin (V13)/Y1, (W14)/PB1,
(Y14)/PrR1of IC U401?
(Y14)/PrR1of IC U401?
NO
Check the line between IC U401 and CN116
Refer to The picture doesn't appear in all modes.
Is the above-mentioned LVDS signals output to connector CN408?
NO
NO
50
LC-42LD264
LC-42LD265
LC-42LD266
LC-42LD265
LC-42LD266
<External input AV (Composite)>No picture on the display (4)
Does not the picture of the composite video signal input to AV(Composite) go out?
TERMINAL UNIT:
MAIN_UNIT:
YES
YES
<External input HDMI1 >No picture on the display (5)
Does not the picture of the HDMI signal input to HDMI1 go out?
MINI AV_UNIT:
YES
YES
YES
<External input HDM2 >No picture on the display (6)
Does not the picture of the HDMI signal input to HDMI2 go out?
MINI AV_UNIT:
YES
YES
YES
Is COMP_Y signal sent to pin (2) of AV (CN116) ?
NO
Check the setting of an external input device that connects of
CN116.
CN116.
Refer to The picture doesn't appear in all modes.
Is COMP_Y signal sent to pin (V13) of IC U401?
NO
Check the line between IC U401 and CN116.
Is the HDMI_0M_HPD detection function of pin (19) of a HDMI1
terminal (CN501) normal?
terminal (CN501) normal?
NO
Check the line between pin (W5) of IC U401 and CN501.
Refer to The picture doesn't appear in all modes.
Is access possible in the re-writing or exchange of EDID data of
IC U401?
Is TMDS signal input into pin ((Y9,W9)/( RX_0_2, RX_0_2B),
(V9,U9)/(
(V9,U9)/(
RX_0_1, RX_0_1B),(V8,V7)/( RX_0_0, RX_0_0B),
(Y7,W7)/( RX_0_C, RX_0_CB)) of IC U401?
Check the line between IC U401 and CN501.
Is the HDMI_2M_HPD detection function of pin (19) of a HDMI1
terminal (CN502) normal?
terminal (CN502) normal?
NO
Check the line between pin (J16) of IC U401 and CN502.
Refer to The picture doesn't appear in all modes.
NO
Are EDID data pin (U7) (SCL) of IC U401, pin (V6) (SDA) accessed,
and is it read from pin (15), pin (16) of a HDMI terminal (CN501)?
NO
Is access possible in the re-writing or exchange of EDID data of
IC U401?
Are EDID data pin (J17) (SCL) of IC U401, pin (J14) (SDA) accessed,
and is it read from pin (15), pin (16) of a HDMI terminal (CN502)?
NO
Is TMDS signal input into pin ((J19,J20)/( RX_2_2, RX_2_2B),
(K19,K20)/(
(K19,K20)/(
RX_2_1, RX_2_1B),(K18,L18)/( RX_2_0, RX_2_0B),
(M17,M18)/( RX_2_C, RX_2_CB)) of IC U401?
NO
Check the line between IC U401 and CN502.
51
LC-42LD264
LC-42LD265
LC-42LD266
LC-42LD265
LC-42LD266
<External input SCART>No picture on the display (7)
Does not the picture of the SCART video signal input to SCART go out?
TERMINAL_UNIT:
MAIN_UNIT:
YES
YES
Is AV signal sent to pin (20)/ SCT1_AV_IN, pin (15)/ SCT1_R_IN,
pin (11)/ SCT1_G_IN, pin (7) SCT1_B_IN of AV1(CN116) ?
pin (11)/ SCT1_G_IN, pin (7) SCT1_B_IN of AV1(CN116) ?
NO
Check the setting of an external input device that connects of
CN151.
CN151.
Refer to The picture doesn't appear in all modes.
Is AV signal sent to pin (V18)/ CVBS0P, (U14)/ Y0P, (U15)/ PB0P,
(W16)/ PR0P, (20)/V of IC U401?
(W16)/ PR0P, (20)/V of IC U401?
NO
Check the line between IC U401 and CN151.
52
LC-42LD264
LC-42LD265
LC-42LD266
LC-42LD265
LC-42LD266
POWER TREE
12. POWER TREE
POWER TREE
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