JVC TM-H1950CG Service Manual
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SERVICE MANUAL
COLOUR VIDEO MONITOR
CONTENTS
! SPECIFICATIONS ･････････････････ ･･････････ ･･･ ･･
･････････ ････････ ･･････････ ･･ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･･ ･･
･････････････････ ･･････････ ･･･ ･･
･････････ ････････ ･･････････ ･･ ･･･
★ OPERATING INSTRUCTIONS (APPENDIX) ･･ ･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･･
! SAFETY PRECAUTIONS ･･･････････ ････････････ ････ ･･ ･ ･･
! SPECIFIC SERVICE INSTRUCTIONS ･･ ･･･ ･･････ ････ ････ ･･ ････ ････ ･･･
! SERVICE ADJUSTMENTS ･･ ･･･ ･･････････ ･･････ ････ ････ ･･･
★ STANDARD CIRCUIT DIAGRAM (APPENDIX) ･････ ････ ････ ･･ ････ ････ ･･ ････ ･･･
! PARTS LIST ･･･････････ ･･････････ ････････ ･･･
･･ ･･･････････････････ ･･････････････ ････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･
･･･････････ ･･････････ ････････ ･･･
･･ ･･･････････････････ ･･･････････
1
TM-H1950CG
TM-H1950CG
･････ ･･ ････ ･･ ････ ････ ･･ ････ ･･･ ･･ ･･ ･ ･･ ････ ････ ･･･
･･ ･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･･
･････ ･･ ････ ･･ ････ ････ ･･ ････ ･･･ ･･
･･･････････････････ ･･ ････ ･･ ･･･ ･････ ････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･
･････････････････････ ･･ ･･ ････ ･･･
･･･････････････････ ･･ ････ ･･ ･･･ ･･
･････ ･･････ ･･ ････ ････ ･･ ････ ･･･ ･････ ････ ･･ ････ ･･ ････ ･･･
･･･････････ ･･ ･･ ････ ････ ･･ ････ ･･･
･････ ･･････ ･･ ････ ････ ･･ ････ ･･･ ･･
･･ ･････････････ ･･････ ･･ ････ ･･･ ･･ ･･ ･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･
･･ ･････････････ ･･････ ･･ ････ ･･･ ･･
･･･ ････････････ ･･････ ････ ････ ･･･
･･･････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･
･･･････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･ ･･ ･ ･･ ････ ･･ ･･･
･････ ････ ････ ･･ ････ ････ ･･ ････ ･･･
CO PYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
/E
/U
･･･ ･･････ ････ ･･････ ････ ･･････ ･･･ ･･ ･･･ ･
･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･･ ･･
･･･ ･･････ ････ ･･････ ････ ･･････ ･･･
･･ ･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･ 3
･･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･
･･ ･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･
･･ ･････ ････ ････ ･･ ････ ････ ･･ ･･･ 12
･･･ ････ ････ ･･ ････ ････ ･･ ････ ･･ ･
･･ ･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･
･･ ･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･ ･･･ ･･ ･･･
･･ ･ ･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･
･･･ ････ ････ ･･ ････ ････ ･･ ････ ･･･ ･･
TM-H1950CG
BASIC CHASSIS
S1
･･･ ･･･ 2
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･･･ ････ ････ ･･ ･･･1-1
･･ ･ ･･ ････ ････ ･･･
･･ ･････ ････ ････ ･
･･ ･ ･･ ････ ････ ･･ ････ ･･･ 6
･･ ･･･ ････ ･･ ････ ･･ ････ ･
･･･ ････ ････ ･･ ････ ････ ･
･･ ･･･ ････ ･･ ･･･
･･ ･ ･･ ････ ･･ ･･･
･･ ･･･ ･･ ････ ･･ ･2-1
･･･ ････ ･･ ･ 39
･･･ ････ ･･ ･
･･ ･･･ ･･ ･･･
No.51961
Jun. 2002
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Summary of Contents for JVC TM-H1950CG
- Page 1 TM-H1950CG SERVICE MANUAL COLOUR VIDEO MONITOR BASIC CHASSIS TM-H1950CG TM-H1950CG CONTENTS ! SPECIFICATIONS ･････････････････ ･･････････ ･･･ ･･ ･･･ ･･･ 2 ･････････ ････････ ･･････････ ･･ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･･ ･･ ･･･ ･･････ ････ ･･････ ････ ･･････ ･･･ ･･ ･･･ ･...
- Page 2 6500K ; x = 0.313, y = 0.329 Colour Temperat ure 9300k ; x = 0.283, y = 0.297 230V AC, 50/60 Hz [TM-H1950CG Power requirements 120 V AC, 50/60 Hz [TM-H1950CG High Voltage 24.7kV ～ 27.3kv [at zero beam current] 0.9A [TM-H1950CG Power consumption 1.3A [TM-H1950CG...
- Page 3 TM-H1950CG SAFETY PRECAUTIONS For District of power requirement is 120V AC (Mainly North America) 1. The design of this product c ontains spec ial hardware, many 10. Isolation Check circuits and components specially for s afety purpos es. For (Safety for Electrical Shock Hazard)
- Page 4 TM-H1950CG SAFETY PRECAUTIONS For District of power requirement is 230V～ ～ ～ ～ 240V AC (Europe, Asia and Oceania) 1. The design of this product contains special hardware, many 9. Isolation Check circuits and components specially for safety purposes. For...
- Page 5 TM-H1950CG SAFETY PRECAUTIONS For UK and Hong Kong 1. The des ign of this product c ontains special hardware and many 4. The leads in the products are routed and dres sed with ties, clamps, circuits and components specially for s afety purpos es. For tubing’s, barriers and the like to be separated from live parts, high...
- Page 6 TM-H1950CG SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE CAUTION Even with the power switch turn off, s ome parts of in this unit are live. Be sure to disconnect the power plug from the AC outlet before disass embly and reassembly. REMOVING THE TOP COVER 1.
- Page 7 TM-H1950CG FRONT PANEL TOP COVER SOCKET PWB FRONT CONTROL PWB DEFLECTION PWB SPEAKER CHASSIS BASE EARTH WIRE MAIN PWB SIGNAL PWB MAIN POWER SWITCH SLOT PWB POWER CORD SLOT HOL DER Fig.3 Fig.2 REAR PANEL TERMINAL BRACKET BOTTOM COVER Fig.1 Fig.4...
- Page 8 TM-H1950CG REMOVING THE SLOT PWB AND SLOT HOLDER A METHOD OF ERECTING THE CHASSIS BASE • Remove the top c over, rear panel and terminal bracket. To check the PW board from back side. 1. Dettach the c onnector connected SLOT PWB and SIGNAL PWB, (1) Remove the chassis base and the other PW boards.
- Page 9 TM-H1950CG REPLACEMENT OF MEMORY IC 1. MEMORY IC This model uses memory IC. In the memory IC, memorized data for c orrec tly operating for the video-chroma, deflection and the other control circuits. SET-UP MENU When replac ing memory IC, be sure to use the IC written with <...
- Page 10 TM-H1950CG SHIPMENT VALUE OF THE SET-UP MENU Setting item Setting content / Range Shipment value CONTRAST BRIGHT PICTURE SUB ADJ. PHASE CHROMA -05 ～ +05 H. POSITION -05 ～ +05 V. POSITION -20 ～ +20 CUT OFF (R / G / B) WHITE BALANCE -20 ～...
- Page 11 TM-H1950CG BLOCK SELECT ITEMS It is no requirement for adjustment about part in the table. Don’t change the values. SIGNAL BLOCK DEFLECTION BLOCK VERTICAL ASPEC T RA TIO ITEM INPUT SIGNAL CONT ENTS ITEM CONT ENTS SCAN S IZE FREQUENC Y...
- Page 12 TM-H1950CG SERVICE ADJUSTMENTS BEFORE STARTING SERVICE ADJUSTMENT ITEMS ADJUSTMENT BASIC ADJUSTMENT 1. Confirm the proper AC power voltage is being supplied. ! Check ing of B1 voltage 2. Supply power to the set and measuring instruments and allow to ! Check ing of High voltage warm up for at least 30 minutes.
- Page 13 TM-H1950CG MEASURING INSTRUMENTS AND STANDARD SIGNAL ! DC voltmeter (digital voltmeter) ! High voltage meter ! Oscilloscope ! Colour temperature meter or Colour analyser ! Component / RGB input card (IF-C01COM) ! Signal generator (PAL/NTSC sys tems) The wave form of signals refer to the following figure.
- Page 14 TM-H1950CG ADJUSTMENT LOCATIONS FRONT CONTROL PWB FR ON T M E NU +(UP ) (DO WN) CHRO M A ー ー ー ー P HAS E V OLUM E/S E LE CT CO LOR AS PE CT OF F CO NTRAS T...
- Page 15 TM-H1950CG UPPER (SOLDER SIDE) CRT SOCKET PWB UPPER SLOT PWB TP-47G CN006 TP-47B CN005 CRT EARTH WIRE TO MAIN PWB (B RAID ED A SS'Y ) TP-E SIGNAL PWB UPPER FRO NT CN005 J001 RE M O TE D-S UB 15PIN...
- Page 16 TM-H1950CG BASIC OPERATION OF SERVICE MENU 1. SERVICE MENU ITEMS With the SERVICE MENU, various settings c an be made, and they are broadly classified in the following items of adjustments. It is no requirement for adjustment the portion of each bloc k.
- Page 17 TM-H1950CG (2) OPERATION OF <BLOCK SELECT> SCREEN SERVICE MENU While the SERVICE MENU <BLOCK SELECT> screen is displaying, in accordance with the key c ontrol dis play (Function Display) at the lower side < BLOCK SELECT > of the screen, be able to operate the various items (Fig. 5).
- Page 18 TM-H1950CG HOW TO OPERATE EACH SERVICE MENU ITEMS ■ SIGNAL BLOCK SIGNAL BLOCK ① In the <BLOCK SELECT> screen, press the CHROMA/PHASE key. ② Then SIGNAL BLOCK adjustment mode screen is displayed (Fig. 7). ③ The original front key function replaced with the different func tion displayed at the lower side of the s creen as s hown below.
- Page 19 TM-H1950CG CUTOFF ADJUSTMENT SCREEN [ WHITE BALANCE Adjustment : METHOD 1 ] Accordance with the screen display, select the each WHITE BALANCE mode following below. CUT OFF adjustment mode (Low light adjustment) ① In the WHITE BALANCE menu screen, press the CHROMA/PHASE key to enter to the CUTOFF adjustment mode (Fig.
- Page 20 TM-H1950CG [WHITE BALANCE Ad justment : METHOD 2 ] SERVICE MENU has the other method for adjusting the WHITE BALANCE. EACH ADJUSTMENT MODE ① In the WHITE BALANCE menu screen, press the VOL UME/SELECT +(UP) key, then enter to the “W01” adjustment mode (Fig. 13).
- Page 21 TM-H1950CG ■ DEFLECTION BLOCK DEFLECTION BLOCK ① In the <BLOCK SELECT> screen, press the VOL UME/SELECT – (DOWN) key. ② Then the DEFLECTION BLOCK adjustment screen is displayed (Fig. 14). The indic ation s ervic e number on the screen are c hanged by the vertical frequency, aspect ratio and sc an size of signal for adjustment.
- Page 22 TM-H1950CG 4. SERVICE MENU FLOW CHART SERVICE MENU <BLOCK SELECT> < BLOCK SELECT > SIGNAL BLOCK WHITE BA LANCE BLOCK DEFLECTION BLOCK CONTROL BLOCK S I G W / B DE F CNT L E X I T SIGNAL BLOCK CUTOFF ADJUSTMENT <...
- Page 23 TM-H1950CG INITIAL SETTINGS OF THE SERVICE MENU The values of the following tables ar e the initial value of Memory IC. They are not the values at the time of factor y shipments. It is necessar y to adjust the adjustment item of each block to an every best state of m onitor based on this initial value. However, since the items of the mar king gray colo ur are the fixed value, it is not necessar y to adjust them.
- Page 24 TM-H1950CG DEFLECTION BLOCK Scan size Vertical Item Contents Variable Range Attribute Initial Value Aspect Ratio Frequency HORIZONTAL POSITION ABSOLUTE 000 ～ 031 000 ～ 063 HORIZONTAL SIZE ABSOLUTE VERTICAL POSITION 000 ～ 127 ABSOLUTE VERTICAL SIZE 000 ～ 127 ABSOLUTE...
- Page 25 TM-H1950CG CONTROL BLOCK Item Contents Variable Range Attribute Initial Value DESTINATION 000 ～ 001 0 : FOR JAPN (9300) FIXED (Be sure to set as 001) 1 : FOR EUROPE / US (6500) UPPER 000 ～ 255 FIXED BRIGHT POINT 000 ～...
- Page 26 High voltage meter CRT Anode 1. Set the power supply voltage to SCREEN VR the High AC230V ± ± ± ± 5V (TM-H1950CG [Lower knob : voltage AC120V± ± ± ± 5V (TM-H1950CG in FBT] 2. Select WHITE BALANCE BLOCK mode from <BLOCK SELECT>...
- Page 27 TM-H1950CG " Must be input the composite video signal for adjusting the white balance. " Set the aspect ratio to 4:3. " There are no requirement for adjustment in the und er scan mode and RGB / component signal mode.
- Page 28 TM-H1950CG Ad justment Item Test equipment Test points Ad justment procedur e locations White Signal generator W06 R DRIVE Finish the adjustment of low light c ompletely first in Balance (Monoscope pattern) W07 B DRIVE advanc e of this adjustment.
- Page 29 TM-H1950CG Ad justment Item Test equipment Test points Ad justment procedur e locations PAL CHROMA Signal generator TP-47B S03(PAL CHROMA) 1. Input a PAL full colour bar signal. Saturatio n (Full colour bar) [SERVICE MENU] TP-E( 2. Connect the oscillo-scope probe to TP-47B and...
- Page 30 TM-H1950CG Ad justment Item Test equipment Test points Ad justment procedur e locations NT SC 3.58 Signal generator TP-47B S05 (NT SC PHASE) 1. Input a NTSC 3.58 full colour bar signal. PHASE (Full colour bar) [SERVICE MENU] TP-E( 2. Connect the oscillo-scope probe to TP-47B and...
- Page 31 TM-H1950CG Ad justment Item Test equipment Test points Ad justment procedur e locations RGB signal Comp onent / RGB S07 (RGB BRIGHT) 1. Turn off the main power s witch on the rear panel. BRIGHT input car d [SERVICE MENU] 2.
- Page 32 TM-H1950CG DEFLECTION CIRCUIT ADJUSTMENT There are 2 kind of adjustment for the DEFLECTION circuit, PAL and NTSC. The adjustment using PAL signal is as the s tandard of all DEFLECTION adjustment. The “#” mark in the table given below expr esses the number of eac h adjustment item. The screen aspect ratio 4 : 3 at 50Hz (PAL) is regarded as the reference value for all adjustments.
- Page 33 TM-H1950CG Ad justment Item Test equipment Test points Ad justment procedur e locations Signal generator D03 (V.CENTER) 9. Input the PAL circle pattern signal. [SERVICE MENU] V. Center (Circle pattern) 10. Adjust D03 to agree with CRT center and signal Ad justment center of vertical direction.
- Page 34 TM-H1950CG Ad justment Item Test equipment Test points Ad justment procedur e locations Signal generator D04 (V.SIZE) 15. Input the crosshatch signal. V. Size (Crosshatch pattern) [SERVICE MENU] 16. Select D04 item, and adjust it to become the Ad justment vertical sc an s ize to 95%.
- Page 35 TM-H1950CG Ad justment Item Test equipment Test points Ad justment procedur e locations Signal generator DD01 (H. CENTER) 23. Switch the aspect ratio to the 4:3 mode. Un der scan (Circle pattern) [SERVICE MENU] 24. Input the PAL c ircle pattern signal.
- Page 36 TM-H1950CG [Adjustm ent using the 60Hz signal input] Ad justment Item Test equipment Test points Ad justment procedur e locations Signal generator DA01 (H. CENTER) 36. Switch the aspect ratio to the 4:3 mode. DA02 (H. SIZE) Hor izontal 37. Input the 60Hz NTSC crosshatch signal.
- Page 37 TM-H1950CG SELF DIAGNOSIS FUNCTION 1. OUTLINE This model includes a SELF-DIAGNOSIS FUNCTION that chec ks the circuit operating status and in event of malfunction, displays and stores the data in a memory. The data are stored in an I ² C memory.
- Page 38 TM-H1950CG REPLACE OF THE CHIP COMPONENT CAUTIONS 1. Avoid heating for more than 3 seconds. 2. Do not rub the electrodes and the resist parts of the pattern. 3. When removing a c hip part, melt the s older adequately.