Read Sharp LC-19A1E (serv.man4) Service Manual online
LC-19A1E-BK/WH
4 – 11
<On input of the tuner (U/V)> No picture on the display (1)
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 level of pins (11) and (10) of tuner (TU501) at H?
NO
These are communications lines for control (I2C). Follow the
path and check whether they are forced to L (PULL_DOWN).
(IC801 (A5) (C4) pin)
path and check whether they are forced to L (PULL_DOWN).
(IC801 (A5) (C4) pin)
YES
Is the video signal (VIDEO) output from pin (17) of tuner
(TU501)?
(TU501)?
NO
Check the tuner (TU501) and peripheral circuits.
YES
Is the video signal CVBS (MTV-V) input to pin (41) of lC501 (AV-
SW)?
SW)?
NO
Isn't there any part with short-circuits at IC501 (AV-SW)?
Check peripheral circuits.
Check peripheral circuits.
YES
Is the video signal CVBS input to pin (U2) of lC801 (DVP-M2)?
NO
Check IC501 (AV-SW), pin (18) of Connector SC1202, pin (18) of
Connect or P501 and peripheral circuits.
Connect or 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 to pins
(53)-(72) of IC9201 (RSDS-TRANSMITTER), and is CLK signal
(CK
(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-B12V=40/41/42pin, VGH=5/6pin, VGL=2/3pin, COM-
BIAS=75/76/77pin)
SC9201 of LCD-PANEL?
(VLS-B12V=40/41/42pin, VGH=5/6pin, VGL=2/3pin, COM-
BIAS=75/76/77pin)
NO
Please check REGULATOR-circuit of a defective voltage respec-
tively.
tively.
YES
Replace LCD-PANEL.
Click on the first or last page to see other LC-19A1E (serv.man4) service manuals if exist.