Read Sharp LC-19D1EBK (serv.man5) Service Manual online
LC-19D1E/S-BK/WH
4 – 21
<When EXT4 is used for external input> No picture on the display (7)
No EXT4 (HDMI) output of the external input system.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
• • • Set it as “EXT4” with the INPUT SOURCE button on the remote
control.
2) Is HDMI-Connector disconnected or connected improperly?
• • • Connect it correctly as per the operation manual.
YES
Is “EXT4” selected with
button on the remote control?
NO
Select “EXT4” with
button on the remote control.
YES
Is TMDS signal (RRX[0:C]
± signal) sent to pins (1)-(12) of EXT4
(HDMI) terminal (SC402)?
NO
Is I2C signal (DDC_SDA/SCL signal) sent to pins (16) and (15)
of EXT4 (HDMI) terminal? Check external connection and
peripheral circuits.
of EXT4 (HDMI) terminal? Check external connection and
peripheral circuits.
YES
Is 8bit-DIGITAL signal (HDMI- R/G/B) sent from pins (71)- (111)
of IC8702 (HDMI-RECEIVER)?
of IC8702 (HDMI-RECEIVER)?
NO
Check power supply (B3.3/2.5V) pins (4)(67)/(95)(103) of
IC8702, SDA/SCL signal pins (66) and (65), and peripheral cir-
cuits.
IC8702, SDA/SCL signal pins (66) and (65), and peripheral cir-
cuits.
YES
Is 8bit-DIGITAL signal (HDMI- R/G/B) sent to pins (Y8)-(AB4) of
IC801 (DVP-M2)?
IC801 (DVP-M2)?
NO
Check SDA2/SCL2 signal pins (66) and (65), interface between
IC801 and lC8702, and peripheral circuits.
IC801 and lC8702, and peripheral circuits.
YES
Is LVDS video signal (RA
± - RD±) output from pins (P22)(P23) -
(V22)(V23) of IC801 (DVP-M2), and is RCLK signal (RCLK
±)
output from pins (U22)(U23)?
NO
Check pins (R19)(D5) of B3.3V line of IC801 (DVP-M2), pins
(D12) of B1.5V line, pins (B6)(A6) of SDA1/SCL1 line and
peripheral circuits.
(D12) of B1.5V line, pins (B6)(A6) of SDA1/SCL1 line and
peripheral circuits.
YES
Is RSDS-R/G/B signal (R[0:2]
±, G[0:2]±, B[0:2]±) output from
pins (53) -(72) of IC9201 (RSDS-TRANSMITTER) , and is CLK
signal (CK
signal (CK
±) output to pins (60) and (59)?
NO
Check pins (1) and (9) of B3.3V line of IC9201 (RSDS-TRANS-
MITTER), short circuits and peripheral circuits.
MITTER), short circuits and peripheral circuits.
YES
Is RSDS-R/G/B signal (R[0:2]
±, G[0:2]±, B[0:2]±) and CLK signal
(CK
±) input to connector (SC9201) of LCD-PANEL?
(RSDS-R signal:22-27pin, RSDS-G signal:57-62pin, RSDS-B
signal:66-71pin, CK
signal:66-71pin, CK
± signal:33/32pin)
NO
Check whether there is short-circuit at CONNECTOR SC9201 of
LCD-PANEL and also check peripheral circuits.
LCD-PANEL and also check peripheral circuits.
YES
Is liquid crystal drive power supply input to CONNECTOR
SC9201 of LCD-PANEL?
(VLS_B14.6V=40/41/42pin, VGH_B32V=5/6pin,VGL_-6V=2/
3pin, COM-BIAS=75/76/77pin)
SC9201 of LCD-PANEL?
(VLS_B14.6V=40/41/42pin, VGH_B32V=5/6pin,VGL_-6V=2/
3pin, COM-BIAS=75/76/77pin)
NO
Please check REGULATOR-circuit of a defective voltage respec-
tively.
tively.
YES
Replace LCD-PANEL.
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