JVC LT-42EM91 Service Manual Download Page 19

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2-4: CONTRAST CENTER

2-5: CONTRAST 40

1. Place the set in Aging Test for more than 15 minutes.

2. Receive the color bar pattern. (RF Input)

3. Using the remote control, set the brightness and

contrast to normal position.

4. Activate the adjustment mode display of

Fig. 1-1

and

4. Activate the adjustment mode display of

Fig. 1-1

and

press the channel button

(50)

on the remote control to

press the channel button

(58)

on the remote control to

select "CONTRAST CENTER".

select "CONTRAST 40".

5. Press the LEFT/RIGHT button on the remote control

until the contrast step No. becomes "106".

until the contrast step No. becomes "144".

6. Check if the picture is normal.

7. Receive the color bar pattern. (VIDEO Input)

8. Using the remote control, set the brightness and

contrast to normal position.

9. Press the INPUT SELECT button on the remote control

to set to the AV mode.

Activate the adjustment mode display of

Fig. 1-1

and

10. Activate the adjustment mode display of

Fig. 1-1

and

press the channel button

(50)

on the remote control to

press the channel button

(58)

on the remote control to

select "CONTRAST CENTER".

select "CONTRAST 40".

Press the LEFT/RIGHT button on the remote control

11. Press the LEFT/RIGHT button on the remote control

until the contrast step No. becomes "97".

until the contrast step No. becomes "129".

Check if the picture is normal.

12. Check if the picture is normal.

Receive the color bar pattern. (COMPONENT Input)

13. Receive the color bar pattern. (COMPONENT Input)

Using the remote control, set the brightness and

14. Using the remote control, set the brightness and

contrast to normal position.

ELECTRICAL ADJUSTMENTS

10.

11.

12.
13.
14.

D-3

contrast to normal position.

Press the INPUT SELECT button on the remote control

15. Press the INPUT SELECT button on the remote control

to set to the COMPONENT mode.

Activate the adjustment mode display of

Fig. 1-1

and

16. Activate the adjustment mode display of

Fig. 1-1

and

press the channel button

(50)

on the remote control to

press the channel button

(58)

on the remote control to

select "CONTRAST CENTER".

select "CONTRAST 40".

Press the LEFT/RIGHT button on the remote control

17. Press the LEFT/RIGHT button on the remote control

until the contrast step No. becomes "94".

until the contrast step No. becomes "124".

Check if the picture is normal.

18. Check if the picture is normal.

Receive the color bar pattern. (HDMI Input)

19. Receive the color bar pattern. (HDMI Input)

Using the remote control, set the brightness and

20. Using the remote control, set the brightness and

contrast to normal position.

Press the INPUT SELECT button on the remote control

21. Press the INPUT SELECT button on the remote control

to set to the HDMI mode.

Activate the adjustment mode display of

Fig. 1-1

and

22. Activate the adjustment mode display of

Fig. 1-1

and

press the channel button

(50)

on the remote control to

press the channel button

(58)

on the remote control to

select "CONTRAST CENTER".

select "CONTRAST 40".

Press the LEFT/RIGHT button on the remote control

23. Press the LEFT/RIGHT button on the remote control

until the contrast step No. becomes "94".

until the contrast step No. becomes "125".

Check if the picture is normal.

24. Check if the picture is normal.

15.

16.

17.

18.
19.
20.

21.

22.

23.

24.

D-3

Summary of Contents for LT-42EM91

Page 1: ...SERVICE MANUAL 42 CLASS WIDE LED TV LT 42EM91 S M CODE NO M3CQ13AASM DATE OF ISSUE 11 2010 ORIGINAL All the specifications and features are subject to change without notice ...

Page 2: ...hecks must be repeated with the AC line be used make sure it is of the polarized type cord plug connection reversed If necessary a nonpolarized adapter plug must be used only for the Since the chassis of this receiver is connected to one purpose of completing these checks side of the AC supply during operation service should not be attempted by anyone not familiar with the If available measure cur...

Page 3: ...ng high temperature soldering iron please be careful not to heat too long Pb free solder will tend to splash when heated too high about 1100o F 600o C Pb free solder will tend to splash when heated too high about 1100 F 600 C All products with the printed circuit board with PbF printing must be serviced with lead free solder When soldering or unsoldering completely remove all of the solder from th...

Page 4: ...IT BOARDS MAIN LED I 1 I 2 FRC OPERATION I 3 I 4 POWER REMOCON I 5 I 8 SCHEMATIC DIAGRAMS FLASH J 1 J 2 DDR2 J 3 J 4 HDMI J 5 J 6 LVDS J 7 J 8 MICON J 9 J 10 SCALER POWER J 11 J 12 TABLE OF CONTENTS SCALER POWER J 11 J 12 TUNER J 13 J 14 SCALER VIDEO AUDIO J 15 J 16 JACK J 17 J 18 REGULATOR J 19 J 20 SOUND J 21 J 22 SOUND2 J 23 J 24 JACK2 J 25 J 26 EMI FILTER J 27 J 28 PFC SUB_POWER J 29 J 30 MAIN...

Page 5: ...Hz Sound FS 41 25MHz FP FS 4 50MHz Preset CH No Preset CH No Stereo Dual TV Sound US Stereo Tuner Sound Muting Yes G 3 Signal Video Signal Input Level 1 V p p 75 ohm Output Level S N Ratio Weighted Horizontal Resolution at DVD Mode RGB Signal Output Level Audio Signal Input Level 8 0dBm 50k ohm Output Level at DVD at TV Digital Output Level 0 5 V p p 75 ohm S N Ratio at DVD Weighted Harmonic Disto...

Page 6: ...Custom Code 03h 0Fh Power Source Voltage D C 3V UM size x pcs UM 3 x 2 pcs Total Keys 31 Keys Keys Power Yes 1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes Yes Recall Quick View Yes Sleep Yes Muting Mute Yes Muting Mute Yes Left Yes Right Yes Up Yes Down Yes CH Yes CH Yes VOL Yes VOL Yes CH Up No CH Down No VOL Right No VOL Left No Menu Yes Reset No Exit Yes Enter Yes Input Select Yes...

Page 7: ...Yes Stable Sound No Surround No Surround No BBE No SRS WOW SRS 3D Focus Tru Bass No HDMI Audio Yes Speakers Variable Audio Out Yes Tuning CH Program Yes Air Cable Yes ADD DELETE Yes Label CH Label Yes Video Label Yes Favorite CH No V Chip Yes Type USA Type RRT Setup Yes Lock Hotel Lock No Channel Lock No Video Lock No Panel Lock No Menu Language English French DBC Dynamic Backlight Control Yes Dyn...

Page 8: ...576p 16 9 No 1280 720p Yes 60Hz 1920 1080i Yes 60Hz 1920 1080p Yes 60Hz 1920 1080p Yes 60Hz CEC ORION Standard No Deep Color No xvYCC No DVI to HDMI Input VGA 640x480 Yes 60 72 75Hz VGA 720x400 Yes 70Hz WVGA 848x480 No SVGA 800x600 Yes 56 60 72 75Hz XGA 1024x768 Yes 60 70 75Hz WXGA 1280x768 Yes 60Hz WXGA 1280x720 Yes 60Hz WXGA 1360x768 Yes 60Hz SXGA 1280x1024 Yes 60Hz WXGA 1440x900 Yes 60Hz FHD 19...

Page 9: ...heet Information FCC No Sheet Information DTV No Sheet Information CEA No Sheet Information Return No Sheet Information Picture Quality No Sheet Information Sheet Set Up No Sheet Information HDMI No Cleaning Cloth No Stand Screw Yes 4pcs Stand Yes G 12 Interface Switch Front Power Yes Channel Up Menu Up Yes Channel Down Menu Down Yes Volume Up Menu Yes Volume Down Menu Yes Menu Yes Play No Eject N...

Page 10: ...W x D x H mm 1013 0 x 29 8 x 629 0 G 14 Weight Net Approx 15 8kg 34 8 lbs Net w o Handle Stand Approx 12 8kg 28 2 lbs Gross Approx 20 8kg 45 9 lbs Gross Approx 20 8kg 45 9 lbs Gross w Master Carton Approx kg lbs G 15 Carton Master Carton No Content Sets Material Dimensions W x D x H mm Description of Origin Gift Box Material Double White W Color Photo Label Yes W Handle No Dimensions W x D x H mm ...

Page 11: ...STAND ASS Y Refer to Fig 1 1 1 Remove the 4 screws 1 2 Remove the Stand Ass y in the direction of arrow DISASSEMBLY INSTRUCTIONS 1 1 Stand Ass y 1 1 1 B 2 1 1 C 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 B A D Back Cabi Ass y Front Cabi Ass y B1 1 1 2 COVER CONNECTOR COVER AC Refer to Fig 1 2 1 Remove the Cover Connector in the direction of arrow A 2 Remove the screws 1 3 Remove the Cover Ac in the direc...

Page 12: ...emove the 4 screws 2 6 Remove the FRC PCB in the direction of arrow B 7 Remove the FRC PCB in the direction of arrow B Disconnect the following connectors CD7601 8 Remove the FRC PCB in the direction of arrow B Unlock the 2 screws 2 9 Remove the FRC PCB in the direction of arrow B Remove the LED PCB in the direction of arrow C DISASSEMBLY INSTRUCTIONS 2 1 1 1 FRC PCB Main PCB 1 1 1 2 2 2 A B LED P...

Page 13: ...sking is carried out on all the parts located within 10 mm distance from IC leads DISASSEMBLY INSTRUCTIONS Fig 2 1 Masking Tape Cotton Tape IC Blower type IC desoldering machine Tweezers B2 1 2 Heat the IC leads using a blower type IC desoldering machine Refer to Fig 2 2 NOTE Do not rotate or move the IC back and forth until IC 4 Peel off the Masking Tape can move back and forth easily after desol...

Page 14: ...y resoldering NOTE 2 Supply the solder from the upper position of IC leads When the IC leads are bent during soldering and or sliding to the lower position of the IC leads repairing do not repair the bending of leads If the Refer to Fig 2 6 bending of leads are repaired the pattern may be damaged So always be sure to replace the IC in this DISASSEMBLY INSTRUCTIONS Fig 2 5 Fig 2 8 IC Thin tip Solde...

Page 15: ...d of the INITIAL DATA of MEMORY IC Minimum Refer to the WHEN REPLACING EEPROM MEMORY IC Check of the SUM DATA POWER ON total hours and MICON POWER ON 8 2 sec VERSION on the screen Refer to the WHEN REPLACING EEPROM MEMORY IC Display of the Adjustment MENU on the screen POWER ON 9 2 sec Refer to the ELECTRICAL ADJUSTMENT On Screen Display Adjustment VOL DOWN Releasing of HOTEL MODE FUNCTION Minimum...

Page 16: ...s should be taken to ensure correct data settings while making reference to INITIAL SETTING TABLE Attached INITIAL DATA 1 Turn on the POWER and set to the ALL mode 2 Set the VOLUME to minimum 3 Press both VOL DOWN button on the set and Channel button 6 on the remote control for more than 2 seconds ADDRESS and DATA should appear as FIG 2 ADDRESS and DATA should appear as FIG 2 NOTE No need to set d...

Page 17: ...OLUME to minimum 34 BRIGHTNESS MIN 2 Press the VOL DOWN button on the set and the channel button 9 on the remote control for more than 2 seconds to display adjustment mode on the screen as 2 BASIC ADJUSTMENTS shown in Fig 1 1 2 1 WHITE BALANCE 1 Place the set in Aging Test for more than 15 minutes TV 2 Receive the gray scale pattern from the Pattern Full Generator 3 Press the INPUT SELECT button o...

Page 18: ...the picture is normal Receive the color bar pattern COMPONENT Input 13 Receive the color bar pattern COMPONENT Input Using the remote control set the brightness and 14 Using the remote control set the brightness and contrast to normal position contrast to normal position ELECTRICAL ADJUSTMENTS 12 13 14 11 10 D 2 contrast to normal position contrast to normal position Press the INPUT SELECT button ...

Page 19: ...the picture is normal Receive the color bar pattern COMPONENT Input 13 Receive the color bar pattern COMPONENT Input Using the remote control set the brightness and 14 Using the remote control set the brightness and contrast to normal position contrast to normal position ELECTRICAL ADJUSTMENTS 10 11 12 13 14 D 3 contrast to normal position contrast to normal position Press the INPUT SELECT button ...

Page 20: ...55 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 37 SHARP H1 MIN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 38 SHARP H2 MAX 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 39 SHARP H2 MIN 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40 SHARP H3 MAX 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 255 41 SHARP H3 MIN 0 0 0 0 0 0 0 0 0...

Page 21: ...1 CP2305 CP2302 CP2301 CP2304 FRC PCB MAIN PCB CP6502 CP6403 CP6401 CD3001 CP3001 CD2802 CP2808 J4302 CP4203 J4207 J4206 J4204 J4203 J4205 J4201 TU5800 CP3602 CP3603 CP2803 CP3601 SPEAKER CD301 CP302 CP301 SPEAKER OPERATION PCB CD6202 CP2201 REMOCON PCB LED PCB CP7601 CD6204 CD6205 CD7601 CD2303 CD2304 CD6401 AC IN CD6502 ...

Page 22: ...TROUBLESHOOTING GUIDE LCD SECTION POWER DOES NOT TURN ON Is F6501 broken Is there voltage at pin 8 of IC6406 14V Change F6501 Change POWER PCB No Yes Check IC6406 and peripheral circuit No Yes E 1 E 1 ...

Page 23: ...hange SP301 and SP302 Check IC301 and peripheral circuit Yes Yes Yes No No CVBS COMPONENT HDMI DVI PC MODE RF MODE Is there signal at pins L3 M2 M1 and L1 of IC2801 Change TU5801 Check IC301 and peripheral circuit Yes No No Change IC2801 Change Digital PCB Yes No Check INPUT JACK CONNECTOR and peripheral circuit Change IC2801 Change Digital PCB Is there signal at pin 5 of TU5801 And Is there signa...

Page 24: ...oes backlight shine Is CD6401 connected Connected CD6401 Is there voltage at pin 1 of CP6401 24V Yes No No No No Yes Yes Yes Yes No Check Q3002 and peripheral circuit Is there voltage at pins Vcc of CP2808 12V Yes No Change MAIN PCB Check pin13 and pin14 of CP6401 Change V2801 PANEL Change DIGITAL PCB No Change FRC PCB E 3 ...

Page 25: ...Serial interface 26 V19 SFCK D Serial flash clock 27 Y21 SFTX D Serial flashtransmit 28 AA22 SFRX D Serial flash Receive 29 AB18 SFHO_N D GPIO 30 AA21 SFWP_N D Serial flash write protect 31 Y20 SFCS_N D Serial Flash Chip select 32 K3 SICL0 D Tuner serial interface clock 33 K2 SIDA0 D Tuner serial interface data 34 Y18 SICL1 D Legacy serial interface clock 35 W19 SIDA1 D Legacy serial interface dat...

Page 26: ... AA7 SDA9 O DDR2 Interface 81 AA5 SDA8 O DDR2 Interface 82 AA8 SDA7 O DDR2 Interface 83 AB4 SDA6 O DDR2 Interface 84 AA6 SDA5 O DDR2 Interface 85 AA4 SDA4 O DDR2 Interface 86 AB7 SDA3 O DDR2 Interface 87 W5 SDA2 O DDR2 Interface 88 W7 SDA1 O DDR2 Interface 89 AB3 SDA0 O DDR2 Interface 90 Y8 SDBA2 O DDR2 Interface 91 Y6 SDBA1 O DDR2 Interface 92 W9 SDBA0 O DDR2 Interface 93 R5 SDVREF0 P DDR2 Interf...

Page 27: ...2 LV0OUT2M O LVDS data out 2 0 136 Y13 LV0OUT1M O LVDS data out 1 0 137 AB13 LV0OUT0M O LVDS data out 0 0 138 AA15 LV1CKOP O LVDS clock out 1 139 AB15 LV1CKOM O LVDS clock out 1 140 AA14 LV1OUT4P O LVDS data out 4 1 141 W15 LV1OUT3P O LVDS data out 3 1 142 AA16 LV1OUT2P O LVDS data out 2 1 143 W16 LV1OUT1P O LVDS data out 1 1 144 AA17 LV1OUT0P O LVDS data out 0 1 145 AB14 LV1OUT4M O LVDS data out ...

Page 28: ...emodulator IF input negative 193 F1 IFINM I Demodulator IF input negative 194 E2 VRPIF P External capacitor 195 E1 VRMIF P External capacitor 196 B22 RXC0M I HDMI clock in ch 0 197 B21 RXC0P I HDMI clock in ch 0 198 A22 RX00M I HDMI data 0 ch 0 199 A21 RX00P I HDMI data 0 ch 0 200 D20 RX10M I HDMI data 1 ch 0 201 D19 RX10P I HDMI data 1 ch 0 202 C20 RX20M I HDMI data 2 ch 0 203 C19 RX20P I HDMI da...

Page 29: ...D converter in L 5 246 A5 AINR5 I Audio A D converter in R 5 247 G1 DA_LOUT O Audio D A converter out L 248 G2 DA_ROUT O Audio D A converter out R 249 G3 DA_VCOM P Audio reference voltage 250 P10 PLL1AVCC P PLL 3 3V power 251 V10 PLL1DVDD P PLL 1 26V power 252 N10 PLL2AVCC P PLL 3 3V power 253 N11 PLL2DVDD P PLL 1 26V power 254 P11 PLL3AVCC P PLL 3 3V power 255 V11 PLL3DVDD P PLL 1 26V power 256 P...

Page 30: ...12 VSS G Common ground 303 N9 VSS G Common ground 304 P12 VSS G Common ground 305 R18 VSS G Common ground 306 P3 VSS G Common ground 307 P5 VSS G Common ground 308 T3 VSS G Common ground 309 U18 VSS G Common ground 310 U5 VSS G Common ground 311 V12 VSS G Common ground 312 V17 VSS G Common ground 313 V5 VSS G Common ground 314 V9 VSS G Common ground 315 W4 VSS G Common ground 316 Y3 VSS G Common g...

Page 31: ...nd 351 E18 VDD33HDMI P HDMI 3 3V power 352 G18 VDD33HDMI P HDMI 3 3V power 353 J18 VDD33_PLL P HDMI PLL 3 3V power 354 E17 VDD33_PLL1 P HDMI PLL 3 3V power 355 D14 VDD33IO P HDMI digital 3 3V power 356 E15 VPPOTP P HDMI digital 1 8V power 357 E14 VSSIO G HDMI digital ground 358 E10 AVDD18 P Analog 1 8V power 359 E12 AVDD18 P Analog 1 8V power 360 C13 AVDD33 P Analog 3 3V power 361 C6 AVDD33 P Anal...

Page 32: ...ODE CATHODE EZJZ0V80010 ATTINY48 MU MCZ5203NA 7101 STR A6059H LV5747NTTL YDA156 VZE2 NJU72011RB2 TE2 AT24C32CN SH T MP6205DD LF Z PST3229NR KIA431A AT PQ035ZN1HZPH AT25DF321 SU R3111N291C TR F AT26DF081A SU RP131H501D T1 F BD9329EFJ E2 FA5591N A2 TE1 RT9025 18GSP RP131H331D T1 F PS2561AL1 1 V W MM1506XNRE ZR39201HGCG YDA164B QZE2 TRANSISTOR R8J66977BG H5PS5162FFR S5C KRA103SRTK KRC103SRTK KTA1664 ...

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