Sharp LC-32RD2E (serv.man5) Service Manual ▷ View online
LC-32RD2E/RU, LC-37RD2E/RU
4 – 6
No sound except from speakers (3)
No audio output from AUDIO_OUTPUT terminal.
Checklist:
1) Is the MUTE button on the remote control set to ON?
••• Set to OFF.
2) Check the connection to external devices.
••• Is there any improper connection?
Is audio signal sent to pins (13) (L-ch) and (15) (R-ch) of
AUDIO_OUTPUT (J1201)?
YES
Check the connection to AUDIO_OUTPUT external (J1201) and
external devices.
external devices.
NO
Is S-MUTE-LINE [IC2301 (62)] at H?
YES
Check the peripheral circuits of IC2301 and S-MUTE_LINE.
(Q1204, Q1203, etc.)
(Q1204, Q1203, etc.)
NO
Is audio signal sent from pins (22) (L-ch) and (21) (R-ch) of
IC3001?
IC3001?
NO
Check IC3001 or peripheral circuits.
YES
Check the audio signal output line from pins (22) (L-ch) and (21)
(R-ch) of IC3001 to pins (13) (L-ch) and (15) (R-ch) of
AUDIO_OUTPUT. (Q1202, Q1201, etc.)
(R-ch) of IC3001 to pins (13) (L-ch) and (15) (R-ch) of
AUDIO_OUTPUT. (Q1202, Q1201, etc.)
DTV troubleshooting
The unit does not enter the DTV mode. Or, the DTV menu does
not appear.
YES
Go to “The unit does not enter the DTV mode. Or, the DTV menu
does not appear.”
does not appear.”
NO
No video output during DTV reception.
YES
Go to “No video output during DTV reception. Colour of image
are not right.”
are not right.”
NO
No audio output during DTV reception.
YES
Go to “No audio output during DTV reception. Sound is low”
LC-32RD2E/RU, LC-37RD2E/RU
4 – 7
The unit does not enter the DTV mode. Or, the DTV menu does not appear.
Digital UNIT:
Is a voltage supplied from IC4701 (3.3V-REG)/IC4704 (1.8V-
REG)/IC4702 (5V-REG)?
Is a voltage supplied from IC4701 (3.3V-REG)/IC4704 (1.8V-
REG)/IC4702 (5V-REG)?
NO
Check peripheral circuits of IC4701/IC4704 of IC4702.
(IC4701, IC4704, IC4702, Q4703 and POW-ON_LINE, etc.)
(IC4701, IC4704, IC4702, Q4703 and POW-ON_LINE, etc.)
YES
Do X4001(32.768kHz)/ X4002(27MHz) oscillate?
NO
Check peripheral circuits of X4001/X4002.
D-TUNER UNIT:
YES
Does each REG [IC206 (REG), IC208 (REG) and IC205 (REG)]
driving IC202 work normally?
driving IC202 work normally?
NO
Check peripheral circuits of IC206/IC208/IC205.
YES
Is a voltage applied to pin (20) (I2CSEL) of P202?
(High=3.3V)
(High=3.3V)
NO
MAIN UNIT:
Check around the pin (42) of IC2301.
Check around the pin (42) of IC2301.
YES
Is FESCL/FESDA signal sent to pins (22) and (21) of P202 and
pins (1) and (13) of IC204 (SW).
pins (1) and (13) of IC204 (SW).
NO
Check peripheral circuits of IC202 (COFDM)/ IC4001 (D-Proces-
sor).
sor).
YES
Does X202 (27MHz) oscillate?
NO
Check peripheral circuits of X202.
YES
Check IC202 (COFDM)/IC4001 (D-Processor).
LC-32RD2E/RU, LC-37RD2E/RU
4 – 8
No video output during DTV reception. Colour of Images are not right.
D-TUNER UNIT:
Is digital signal fed from pins (20) and (21) of TU201 (TUNER) to
pins (11) and (10) of IC202 (COFDM)?
Is digital signal fed from pins (20) and (21) of TU201 (TUNER) to
pins (11) and (10) of IC202 (COFDM)?
NO
Check TU201 and its peripheral circuits and if I2C is accessed
between TU201 and IC202.
between TU201 and IC202.
YES
Is data FED[0:7] sent from pins (3), (4), (5), (6), (8), (9), (10) and
(11) of P202?
(11) of P202?
NO
Check between IC202 and P202.
DIGITAL UNIT:
YES
Are video signals (R/G/B, CVBS) sent from C4639/C4640/C4641/
C4625?
C4625?
NO
Check R4011 (AC8pin), R4013 (AC9pin) and IC4001 (D-Proces-
sor).
sor).
YES
Are video signals (R/G/B, CVBS) send from the C4636/C4637/
C4638 and emitters of Q4607?
C4638 and emitters of Q4607?
NO
Check Q4601-Q4607 and their peripheral circuits.
MAIN UNIT:
YES
Is video signal (CVBS) sent from pin (7) of IC2801 (SW).
NO
Check IC2801 and its peripheral circuits.
YES
Are video signals (R/G/B, CVBS) fed from pins (179), (180), (181)
and (184) of IC3001?
and (184) of IC3001?
NO
Check peripheral circuits of IC3001.
YES
Are scrambled images not displayed?
YES
DIGITAL UNIT:
Check 5V output of pin (1) of IC4702.
Check 5V of pin (1), (2), (5), (6) of Q4401.
Check 5V output of pin (1) of IC4702.
Check 5V of pin (1), (2), (5), (6) of Q4401.
NO
Refer to “No video output in all modes”.
No audio output during DTV reception. Sound is low.
DIGITAL UNIT:
Is audio signal fed to pins (5) (L-ch) and (10) (R-ch) of IC4604
(OP-AMP)?
Is audio signal fed to pins (5) (L-ch) and (10) (R-ch) of IC4604
(OP-AMP)?
NO
Check R4002 (AD2pin) and IC4001 (D-Processor).
YES
Is audio signal sent from pins (7) and (8) of IC4604 (OP-AMP)?
NO
NO Check power supply of IC4604 (OP-AMP) and its peripheral
circuits.
circuits.
MAIN UNIT:
YES
Is audio signal sent to pins (11) and (4) of IC2721 (SW)?
NO
Check the line between IC4604 and IC2721.
YES
Is D-TUNER-L audio signal sent to pins (10) of IC3001?
Is D-TUNER-R audio signal sent to pins (9) of IC3001?
Is D-TUNER-R audio signal sent to pins (9) of IC3001?
NO
Check output of pins (13) and (3) of IC2721 and peripheral cir-
cuits.
cuits.
YES
Refer to “No sound output in all modes”.
LC-32RD2E/RU, LC-37RD2E/RU
4 – 9
No picture on the display (1)
No video output in all modes.
YES
Are there the RDI[0:9], GDI[0:9], BDI[0:9], VCT_ENI, VCT_VI,
VCT_HI and VCT_PCLKI signal outputs from IC3001?
VCT_HI and VCT_PCLKI signal outputs from IC3001?
NO
Check IC3001 and its peripheral circuits.
YES
Are there the RDI[0:9], GDI[0:9], BDI[0:9], VCT_ENI, VCT_VI,
VCT_HI and VCT_PCLKI signal inputs at IC3301 (FRC)?
VCT_HI and VCT_PCLKI signal inputs at IC3301 (FRC)?
NO
Check the line between IC3001 and IC3301.
YES
Are there the RDL[12-19, 22-29], GDL[12-19, 22-29], BDL[12-19,
22-29], HCL, VCL, DEL and CLKL signal outputs from IC3301?
22-29], HCL, VCL, DEL and CLKL signal outputs from IC3301?
NO
Check IC3301 and its peripheral circuits.
YES
Are there the RDL[12-19, 22-29], GDL[12-19, 22-29], BDL[12-19,
22-29], HCL, VCL, DEL and CLKL signal inputs at IC2361
(LVDS)?
22-29], HCL, VCL, DEL and CLKL signal inputs at IC2361
(LVDS)?
NO
Check the line between IC3301 and IC2361.
YES
Is there the LVDS signal output at the LVDS 1st channel and 2nd channel of IC2361?
TA1_P/M (49/48), TB1_P/M (47/46), TC1_P/M (44/42), TCLK1_P/M (42/41), TD1_P/M (49/48), TA2_P/M (37/36), TB2_P/M (35/34), TC2_P/M (32/
31), TCLK2_P/M (30/29), TD2_P/M (28/27)
TA1_P/M (49/48), TB1_P/M (47/46), TC1_P/M (44/42), TCLK1_P/M (42/41), TD1_P/M (49/48), TA2_P/M (37/36), TB2_P/M (35/34), TC2_P/M (32/
31), TCLK2_P/M (30/29), TD2_P/M (28/27)
YES
NO
Check the panel module.
Check IC2361 and its peripheral control circuits.
(IC3301, IC2301, etc.)
(IC3301, IC2301, etc.)
<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
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
••• See the operation manual and set “INPUT SOURCE” to “TV”.
2) Is MENU-PICTURE-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.
Is level of pins (15) and (14) of tuner (TU201) and pins (10) and
(11) of IC201 (IF-DEMOD) at H?
NO
These are communications lines for control (I2C). Follow the
path and check whether they are forced to L (PULL_DOWN).
path and check whether they are forced to L (PULL_DOWN).
YES
Is the video signal (IF) sent from pin (17) of tuner (TU201)?
NO
Check the tuner (TU201) and peripheral circuits.
YES
Is video signal sent from pin (17) of IC201 (IF-DEMOD)?
NO
Check FL201 (SAW-FIL), IC201 and peripheral circuits.
YES
Is the video signal VIN1 (ATUNER-CVBS) sent to pin (191) of
lC3002 (VCT)?
lC3002 (VCT)?
NO
Check IC201 (IF-DEMOD), CONNECTOR (P201/SC2742) and
peripheral circuits. (Q204, etc.)
peripheral circuits. (Q204, etc.)
YES
Refer to “No video output in all modes”.
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