No Picture On The Display - Sharp LC-19D1E/S-BK/WH Service Manual

<0n input of the DTVtuner>
No picture appears on LCD during the DTV tuner reception.
Checklist:
1) Is "INPUT SOURCE" button
remote control.
2) Is MENU-Picture-Backlight/Contrast/Brightness set to "MIN" ? • • • Set it to an appropriate level.
3) Is the level of pin (9)(8) of tuner (TU201) at "H"? • • • These are serial communications lines (I2C) for the control. If it is "L", check whether
something pulls it to "L". (IC801 (A5)(C4)pin)
(AV-UNIT)
Is the DTV-R/G/B signal output from pin (4)/(3)/(2) of Connector
P503?
Is the DTV-CVBS signal output from pin (6) of connector P503?
Is the DTV-R/G/B signal input to pin (9)/(1)/(14) of IC507(SW)?
Is the DTV-CVBS signal input to pin (4) of IC508(SW)?
Is the SC-R/G/B signal output from pin (6)/(3)/(5) of IC507(SW)?
Is the DTV-CVBS signal output from pin (2) of IC508(SW)?
(MAIN-UNIT) YES
Is the SC-R/G/B signal input to pin (N1)/(J1)/(K2) of IC801(DVP-
M2)?
Is the DTV-CVBS signal input to pin (W1) of IC801(DVP-M2)?
Is LVDS video signal (RA ± ~ RD ±) output from pins (P22)(P23) -
(V22)(V23) of IC801 (DVP-M2), and is RCLK signal (RCLK ±) out-
put from pins (U22) (U23)?
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±) output from pins (60) and (59)?
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 sig-
nal:66-71pin, CK ±signal:33/32pin)
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)
Replace LCD-PANEL.
YES
on the remote control set up correctly ? • • • set it as "DTV" with the INPUT SOURCE button
YES
YES
YES
YES
YES
YES
YES
YES

No picture on the display (1)-1

NO Check the course between Connector P503 and IC507(SW).
Check the course between Connector P503 and IC508(SW).
NO Check pins (13) of B9V line of IC507, and soldering.
Check pins (3) of B9V line of IC508, and soldering.
NO Check pins (16)/(17)/(18) of Connector SC1203, (16)/(17)/(18)
of Connector P502 and peripheral circuits. (At the RGB signal).
Check pins (14) of Connector SC1203, (14) of Connector P502
and peripheral circuits. (At the CVBS signal)
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.
NO Check pins (1) and (9) of B3.3V line of IC9201 (RSDS-TRANS-
MITTER), short circuits and peripheral circuits.
NO Check whether there is short-circuit at connector SC9201 of
LCD-PANEL and also check peripheral circuits.
NO Please check REGULATOR-circuit of a defective voltage
respectively.
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LC-19D1E/S-BK/WH
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