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JVC TM-H1950CG Service Manual Download Page 8

No.51961

TM-H1950CG

  8

REMOVING THE SLOT PWB AND SLOT HOLDER

•

 

Remove  the top c over, rear  panel  and terminal bracket.

1. Dettach the c onnector connected SLOT PWB and SIGNAL PWB,

then remove the SLOT PWB with slot holder.

REMOVING THE CHASSIS BASE

•

 

Remove  the top c over, rear  panel  and terminal bracket.

1.  Fall the unit down s ide ways as able to see the bottom side.
2.  Lift the back side of the chass is bas e slightly, and s eparate it from

bottom c over.

3. Raise the 

2

 claws positioned bottom of the chassis  base, and

dettac h the c hass is base from bottom cov er.

4.  Then pull the chassis base out to rearward.

REMOVING THE SLOT PWB

•

 

Remove the SLOT PWB with slot holder from SIGNAL PWB.

1. Remove the 

4

 screws marked 

-

-

-

-

.

2.  Then remove the SLOT PWB from slot holder.

REMOVING THE DEFLECTION PWB

•

 

Remove the top c over.

1. Remove the 

2

 screws marked 

.

.

.

.

.

2. Dettach the connec tor connected DEFLECTION PWB and MAIN

PWB.

3.  Then remove the DEFLECTION PW B.

REMOVING THE BOTTOM COVER

•

 

Remove  the chasssis base.

1. Set the CRT front surfase downward, and stand the bottom cover

to facing it toward you.
At this time, care must be exerc is ed not to damage the front panel
and CRT surface.

2. Remove the 

4

 screws marked 

/

/

/

/

 and 

2

 screws marked 

0

0

0

0

.

3. While spreading the bottom cover to the bottom s ide, pull it out to

rearward  to remove it.

REMOVING THE SPEAKER

•

 

Remove the top c over.

1. Slightly spread the c laws of the speaker holder, and pull up the

speaker to remove it.

A METHOD OF ERECTING THE CHASSIS BASE

To check  the PW  board from back side.
(1) Remove the chassis base and the other PW boards.
(2) Erect the chassis base vertically so that you can easily c hec k the

PW board from bac k side.

CAUTION

•

 

Before turning on power, make sure that the earth wire properly
connec ted to the terminal bracket, which is attac hed the main
power switc h and AC inlet. (Fig.5)

•

 

And make sure that the CRT earth wire and the other connec tors
are properly connected.

•

 

When erecting the chassis base, be careful so that there will be
no contac ting with the other PW  board.

•

 

Be careful while erecting the PW board, because easily fall down.

WIRE CLAMPING AND CABLE TYING

1. Be sure to clamp the wire.
2. Never remove the c able tie used for tying the wires together.

Should it be inadvertently removed, be sure to tie the wires with a
new cable tie.

EARTH WIRE LUG

EARTH BRACKET

TERMINAL

BRACKET

Fig.5

Summary of Contents for TM-H1950CG

Page 1: ...LTD TM H1950CG E TM H1950CG U CONTENTS SPECIFICATIONS 2 OPERATING INSTRUCTIONS APPENDIX 1 1 SAFETY PRECAUTIONS 3 SPECIFIC SERVICE INSTRUCTIONS 6 SERVICE ADJUSTMENTS 12 STANDARD CIRCUIT DIAGRAM APPENDIX 2 1 PARTS LIST 39 BASIC CHASSIS S1 SERVICE MANUAL COLOUR VIDEO MONITOR ...

Page 2: ... connector 2 1Vp p 75Ω negative sync 1 bridge connected output possible with automatic termination Input A Audio signal Monaural RCA pin 1 500mV rms High impedance 1 bridge connected output posible Composite video signal BNC connector 2 1Vp p 75Ω negative sync 1 bridge connected output possible with automatic termination Y C separate signal S input priority Mini Din 4pin 2 1 bridge connected outpu...

Page 3: ...mplete product 8 Do not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button 9 When service is required observe the original lead dress Extra precaution should...

Page 4: ...turer of the complete product 7 Do not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resistor to the anode button 8 When service is required observe the original lead dress Extra pr...

Page 5: ...cs are identified in the Parts List of Service Manual Electrical components having such features are identified by shading on the schematics and by on the Parts List in the Service Manual The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the Parts List of Service Manual may cause shock fire or other hazards 4 The le...

Page 6: ... Remove the screw marked attached the terminal bracket with the chassis base 7 Remove the 2 hexagonal screws marked attached the D SUB terminal with the terminal bracket 8 As shown in Fig 1 lift the rear panel and remove the claw marked from the terminal bracket 9 Shift the top portion of the rear panel slightly rearward and raise it upward to remove it REMOVING THE TERMINAL BRACKET Remove the top...

Page 7: ...RT DEFLECTION PWB MAIN PWB SIGNAL PWB FRONT CONTROL PWB TERMINAL BRACKET SLOT HOLDER SLOT PWB EARTH WIRE POWER CORD REAR PANEL BOTTOM COVER Fig 1 Fig 2 Fig 3 CRT SOCKET PWB Fig 4 MAIN POWER SWITCH SPEAKER CHASSIS BASE B C E G J R D N P H A S A A F ...

Page 8: ...u At this time care must be exercised not to damage the front panel and CRT surface 2 Remove the 4 screws marked and 2screws marked 0 0 0 0 3 While spreading the bottom cover to the bottom side pull it out to rearward to remove it REMOVING THE SPEAKER Remove the top cover 1 Slightly spread the claws of the speaker holder and pull up the speaker to remove it A METHOD OF ERECTING THE CHASSIS BASE To...

Page 9: ...ect the item and set the correct value 6 Adjust the front control items Adjust the CHROMA PHASE CONTRAST and BRIGHT Not all items can be adjusted as expected if the signal has not been input correctly in the adjustments 7 Confirm the items of SERVICE MENU Confirm the each item of the SERVICE MENU Refer to the corresponding page to operate the SERVICE MENU SIGNAL BLOCK WHITE BALANCE BLOCK DEFLECTIO...

Page 10: ...E SYSTEM MAKE INPUT REMOTE A B SHIPMENT VALUE OF THE MENU Setting item Setting content Range Shipment value APERTURE 00 40 00 ADJ BAR POSI LOWER COLOUR TEMP 9300 COLOUR SYSTEM AUTO COMPO LEVEL 40 10 00 RUSH DELAY STD SHIPMENT SETTINGS OF FRONT PANEL CONTROLS Control item Shipment settings INPUT SELECT A ASPECT OFF BLUE CHECK OFF COLOR OFF OFF UNDER SCAN OFF MENU OFF VOLUME 20 CONTRAST 00 BRIGHT 00...

Page 11: ...LOCK CONTROL BLOCK ITEM INPUT SIGNAL CONTENTS ITEM CONTENTS W01 R CUTOFF C01 DESTINATION 000 For Japan 001 For Europe US W02 G CUTOFF C02 UPPER W03 B CUTOFF C03 BRIGHT POINT LOWER W04 R DRIVE 6500K C04 UPPER W05 B DRIVE 6500K C05 CONTRAST POINT LOWER W06 R DRIVE 9300K C06 UPPER W07 VIDEO COMPOSITE SIGNAL B DRIVE 9300K C07 CHROMA POINT LOWER W08 R CUTOFF C08 UPPER W09 G CUTOFF C09 PHASE POINT LOWER...

Page 12: ...lance Low Light adjustment White Balance High Light 6500K adjustment White Balance High Light 9300K adjustment Bright adjustment Contrast adjustment PAL Chroma adjustment PAL Phase adjustment NTSC 3 58 Chroma adjustment NTSC 3 58 Phase adjustment Component Chroma adjustment RGB Bright adjustment RGB Contrast adjustment DEFLECTION CIRCUIT ADJUSTMENT Adjustment using 50Hz signal 4 3 Horizontal cente...

Page 13: ...L NTSC colour bar 0 525VB W 0 SETUP BURST PAL 0 3Vp p NTSC 0 286Vp p 75 saturation Y C Separate signal colour bar Chroma Luminance 75 SATURATION CHROMA BURST RATIO C BURST NTSC 0 286Vp p PAL 0 3Vp p CHROMA LEVEL PAL 2 2 1 NTSC 2 3 1 0 525V B W 0 SETUP 75 saturation Y Component signal 100 0 100 0 Interface 75 0 75 0 setup colour bar 0 525VB W 0 SETUP Y R Y Vp p 0 525V B Y Vp p 0 525V RGB signal R V...

Page 14: ...VIDEO B A ASPECT BLUE CHECK CO LOR OF F UNDER SCAN MENU VOLUM E SELECT UP DO WN ー ー ー ー CO NTRAST BRIG HT CHRO MA PHASE FRONT FUSE F901 TO DEF YOKE L TO MAIN POWER SWITCH DEFLECTION PWB S SPEAKER CN004 CN003 A 1pin B1 TP 91 2pin NC 3pin X RAY2 4pin X RAY1 5pin TP E GND 6pin LB I TO DEG COIL SLOT PWB B1 ADJ VR FBT POW ER SW FOCUS1 SCREEN UPPER FOCUS2 MIDDLE LOWER ...

Page 15: ...ONT CN002 CN001 J001 VIDEO A J002 J003 VIDEO B J004 J005 Y C IN J006 Y C OUT AUDIO A AUDIO B CN005 CN005 CN006 TP E TP 47G U CRTEARTHWIRE B RAID ED A SS Y T TP 47B SOLDER SIDE E1 SLOT PWB UPPER CRT SOCKET PWB UPPER SIGNAL PWB T TO MAIN PWB REMO TE D SUB 15PIN ...

Page 16: ...O ENTER THE SERVICE MENU Press MENU key and VOLUME SELECT UP key simultaneously Fig 1 The letter S appears at the upper left of the screen Fig 2 While displaying the letter S press MENU key and CHROMA PHASE key simultaneously Fig 1 The screen display PLEASE DON T TOUCH Fig 3 WHILE displaying the letters above mentioned press VOLUME SELECT UP key or DOWN key to display the SERVICE MENU as shown in ...

Page 17: ... return to the BLOCK SELECT screen Again press MENU key then return to the normal screen The setting values are automatically memorized SIGNAL BLOCK WHITE BALANCE BLOCK DEFLECTION BLOCK CONTROL BLOCK BLOCK SELECT SIG CN TL EXIT W B DE F SIG CNTL EXIT W B DEF Function Display Front Panel Key Arrangement SIGNAL BLOCK Press CHROMA PHASE key Enter to signal circuit adjustment mode WHITE BALANCE BLOCK ...

Page 18: ... screen press the CONTRAST BRIGHT key Then WHITE BALANCE menu screen is displayed Fig 8 In this case key function is replaced as shown below There are several modes of WHITE BALANCE adjustment Select the various WHITE BALANCE mode from this menu screen Press the MENU key few times then exit from the WHITE BALANCE BLOCK screen to return to the BLOCK SELECT screen S01 EXIT DISP SIGNAL BLOCK S01 EXIT...

Page 19: ...ess the VOLUME SELECT key enter to 9300 DRIVE mode Whenever press the CHROMA PHASE key change the R DRIVE or B DRIVE adjustment mode CONTRAST BRIGHT key is the switch of the screen display If necessary you can shut off the display Carefully values of adjustment items are changed while shut off the screen display Refer to the High Light adjustment corresponding page about detailed adjustment steps ...

Page 20: ...en enter to the W01 adjustment mode Fig 13 Whenever press the CHROMA PHASE key change the adjustment mode from W01 to W24 And change the adjustment value by pressing the VOLUME SELECT or keys W01 EXIT DISP Select the service number Data operate inc dec key Adjustment mode exit key Function Display Front Panel Key Arrangement EACH ADJUSTMENT MODE W01 EXIT DISP Fig 13 Display on off switch ...

Page 21: ...ment for adjustment except for the portion about this block Please not to change the values If you had changed the values you should put back the values by the method as following In the BLOCK SELECT screen press the VOLUME SELECT UP key Then the CONTROL BLOCK adjustment screen is displayed Fig 15 The original front key function replaced with the other function displayed at the lower side of the s...

Page 22: ...T ITEM SELECT WHITE BALANCE BLOCK ITEM SELECT CUT OFF CUTO 6500 DRIVE 65 D 9300 DRIVE 93 D SIGNAL BLOCK WHITE BALANCE BLOCK DEFLECTION BLOCK CONTROL BLOCK BLOCK SELECT S01 SI G CNT L EXI T W B DEF CUTO W 01 EXI T 65 D 9 3 D EXI T DIS P D01 EXI T C01 EXI T RGB EXI T SE RV R CUTOF F 9300 R DRIVE RGB EXI T DI SP 6500 DRIVE ADJUSTMENT 6500 R DRIVE RGB EXI T DI SP W01 EXI T DIS P ...

Page 23: ...IXED 062 S12 COMPONENT PHASE 000 127 FIXED 063 S13 VIDEO CONT TRACKING 00 31 FIXED 016 WHITE BALANCE BLOCK Item Input Signal Contents Variable Range Attribute Initial Value W01 R CUTOFF 000 255 ABSOLUTE 050 W02 G CUTOFF 000 255 ABSOLUTE 050 W03 B CUTOFF 000 255 ABSOLUTE 050 W04 R DRIVE 6500 000 127 ABSOLUTE 080 W05 B DRIVE 6500 000 127 ABSOLUTE 048 W06 R DRIVE 9300 000 127 ABSOLUTE 065 W07 VIDEO B...

Page 24: ...21 DB8 16 9 NORMAL 50Hz E W CORNER 032 000 031 OFFSET 002 DC1 HORIZONTAL POSITION 032 000 031 OFFSET 000 DC2 HORIZONTAL SIZE 064 000 063 OFFSET 000 DC3 VERTICAL POSITION 128 000 127 OFFSET 000 DC4 VERTICAL SIZE 128 000 127 OFFSET 030 DC5 VERTICAL LINEARITY 032 000 031 OFFSET 000 DC6 VERTICAL S CORRECTION 064 000 063 OFFSET 000 DC7 E W PARABOLA 064 000 063 OFFSET 021 DC8 16 9 NORMAL 60Hz E W CORNER...

Page 25: ...TION 000 010 FIXED 000 C11 OSD VERTICAL FREQUENCY 50Hz 000 010 FIXED 004 C12 OSD VERTICAL FREQUENCY 60Hz 000 010 FIXED 002 C13 HORIZONTAL CENTER RGB 128 000 127 OFFSET 007 C14 HORIZONTAL CENTER COMPONENT 128 000 127 OFFSET 002 C15 BRIGHT SERVICE 000 127 FIXED 000 C16 SHARPNESS CENTER 000 127 FIXED 024 C17 HVT H 000 007 FIXED 004 C18 HVT V 000 007 FIXED 003 C19 HVT H UNDER SCAN 000 007 FIXED 004 C2...

Page 26: ...age meter CRT Anode SCREEN VR Lower knob in FBT 1 Set the power supply voltage to AC230V 5V TM H1950CG E AC120V 5V TM H1950CG U 2 Select WHITE BALANCE BLOCK mode from BLOCK SELECT screen 3 Select CUTOFF adjustment mode Low light mode 4 Press SERV switch to display the horizontal line 5 Adjust the SCREEN VR to disappear the horizontal line 1 Connect the high voltage meter to the CRT anode and check...

Page 27: ...REEN VR from the left to the right direction to bring one of the red green and blue colours faintly visible 7 Then select the CUTOFF switch R G or B that colour except for appears first and adjusting 2 colours CUTOFF values by pressing the key and make horizontal line visible white 8 Readjust the SCREEN VR to appear the horizontal line faintly and cancel the horizontal line to press the SERV switc...

Page 28: ...ng is finest when CONTRAST and BRIGHT are up and down Bright adjustment Signal generator Sprit colour bar S01 BRIGHT SERVICE MENU Finish the adjustment of low light completely first in advance of this adjustment 1 Input a sprit colour bar signal 2 Select the SIGNAL BLOCK mode from BLOCK SELECT screen 3 Select the S01 item 4 Adjust the S01 to where the sprit colour bar 0 black component not to brig...

Page 29: ...ASE Saturation adjustment Signal generator Full colour bar S11 PAL PHASE SERVICE MENU 1 Select the SIGNAL BLOCK mode from BLOCK SELECT screen 2 Select the S11item 3 Confirm that the value is 062 If differ correctly set the value to 062 NTSC 3 58 CHROMA Saturation adjustment Signal generator Full colour bar Oscillo scope TP 47B TP E CRT SOCKET PWB S04 NTSC CHROMA SERVICE MENU 1 Input a NTSC 3 58 fu...

Page 30: ...e Component signal CHROMA adjustment Component RGB input card IF C01COM Signal generator Full colour bar Oscillo scope TP 47B TP E CRT SOCKET PWB S06 NTSC PHASE SERVICE MENU 1 Turn off the main power switch on the rear panel 2 Insert the component RGB input card to the rear slot 3 Input the colour bar signals Y B Y R Y to each terminal of the component RGB input card 4 Select the INPUT D by the fr...

Page 31: ...ar 0 black component not to brightens 9 Check it out by pressing the DISP switch on and off RGB signal CONTRAST adjustment Component RGB input card IF C01COM Signal generator Sprit colour bar Signal distributor Oscillo scope TP 47G TP E CRT SOCKET PWB S08 RGB CONTRAST SERVICE MENU 1 Turn off the main power switch on the rear panel 2 Insert the component RGB input card to the rear slot 3 Input the ...

Page 32: ...0Hz PAL D0 4 3 NORMAL SCAN 60Hz NTSC DA 50Hz PAL DB 16 9 NORMAL SCAN 60Hz NTSC DC 50Hz PAL DD 4 3 UNDER SCAN 60Hz NTSC DE 50Hz PAL DF 16 9 UNDER SCAN 60Hz NTSC DG Adjustment using the 50Hz signal input Item Test equipment Test points Adjustment locations Adjustment procedure 4 3 H Center H Size Adjustment Signal generator Crosshatch pattern D01 H CENTER D02 H SIZE SERVICE MENU 1 Input a crosshatch...

Page 33: ...nt Signal generator Circle pattern D04 V SIZE D05 V LIN D06 V S COR SERVICE MENU 11 Input the PAL circle pattern signal 12 Select the D04 to adjust the vertical size become 100 13 Select the D05 and reference to the below figure adjust it to become correctly about vertical size and vertical linearity 14 Select D06 and adjust it to the circle pattern becomes the true circle at top and bottom of the...

Page 34: ... D03 to correct 16 9 V Size Adjustment Signal generator Circle pattern DB04 V SIZE SERVICE MENU 18 Input the PAL circle pattern signal 19 Switch the aspect ratio to the 16 9 mode 20 Adjust the DB04 to the vertical size become the value given below 16 9 Side pincushion Adjustment Signal generator DB07 E W PARABORA DB08 E W CORNER SERVICE MENU 21 Confirm the side pincushion of the four corners in th...

Page 35: ...rectly 4 3 Under scan Horizontal size Adjustment Signal generator Crosshatch pattern DD02 H SIZE C22 TRAPEZOID DD01 H CENTER SERVICE MENU 29 Select the DD02 and adjust it to the left and right blanking widths become the value given below 30 At this time it checks that corner of the screen is not distorted If distorted adjust the C22 to become correct 31 If horizontal center is shifted readjust DD0...

Page 36: ...o the circle pattern becomes true circle at the top and bottom of the screen 47 Adjust the DA04 to set the vertical size is 95 16 9 Vertical center Vertical linearity Adjustment Signal generator DC04 V SIZE DC07 E W PARABOLA DC08 E W CORNER SERVICE MENU 48 Set the aspect ratio to 16 9 49 Adjust the vertical size by DC04 50 Confirm the side pincushion of the four corners in the screen If not optimu...

Page 37: ... at this time POWER LED flashes CAUSE LED FLASHING CYCLE X RAY PROTECTOR Quickly 0 1 sec on 0 1 sec off cycles OVER CURRENT PROTECTOR Slowly 1 0 sec on 1 0 sec off cycles SELF DIAGNOSIS FUNCTION mode release Turn the power switch to off or disconnect the power plug from AC outlet In this way not to clear the error counts Reset the error count 1 While press the MENU key and CHROMA PHASE key simulta...

Page 38: ...rs and remove the chip part Transistors diodes variable resistors etc 1 Apply extra solder to each lead 2 As shown in the figure push the part with tweezers and alternately melt the solder at each lead Shift and remove the chip part Note After removing the part remove remaining solder from the pattern 2 How to install Chip parts Resistors capacitors etc 1 Apply solder to the pattern as indicated i...

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