Read Sharp LC-19D1EBK (serv.man5) Service Manual online
LC-19D1E/S-BK/WH
4 – 13
<On input of the tuner (U/V)> No picture on the display (2)
No picture appears on LCD during the tuner (U/V) reception.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
• • • Set it as “TV” with the INPUT SOURCE button
on the remote
control.
2) Is MENU-Picture-Backlight/Contrast/Brightness set to “MIN”?
• • • Set it to an appropriate level.
3) Is ANT-CABLE disconnected or connected improperly?
• • • Connect it correctly as per the operation manual.
YES
Is the video signal (IF) output from pin (6) of Tuner (TU201 )?
NO
Check the Tuner (TU201) and peripheral circuits.
YES
Is the video signal (CVBS) output from pin (35) of lC501 (AV-
SW)?
SW)?
NO
Check pin(38) of the B9V power line , pins(28) and (29) of I2C-
line, and peripheral circuits.
line, and peripheral circuits.
YES
Is the video signal CVBS input to pin (U2) of lC801 (DVP-M2)?
NO
Check pin (35) of IC501 (AV-SW), pin (18) of Connector SC1202,
pin (18) of Connector P501 and peripheral circuits.
pin (18) of Connector P501 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 from 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)
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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