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FILE NO. 020-200012
SERVICE MANUAL
COLOR TELEVISION
N0NSP Chassis
50A60, 50A50
(TAC0050) (TAC0051)
55A60, 61A60
(TAC0052)
(TAC0053)
TOSHIBA CORPORATION
1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN
PUBLISHED IN JAPAN, May., 2000 S
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TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS ........................................................................................................................................ 3 CRT ASSEMBLY REPLACEMENT AND MOUNTING ............................................................................................. 4 PICTURE TUBE COMPONENTS ADJUSTMENT.................................................................................................... 6 REPLACEMENT OF THE
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CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce potentially hazardous 2. This receiver is equipped with a Fail Safe (FS) circuit which X-RAY RADIATION. To avoid such hazards, the high volt- prevents the receiver from producing an excessively high age must not be above the specifie
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CRT ASSEMBLY REPLACEMENT AND MOUNTING CAUTION : DO NOT LOOSEN THE HEX HEAD BOLTS WITH SPRINGS (12 PCS), BECAUSE THOSE ARE FOR SEALING OF CRT COOLANT. R GB Attention Serviceman The Hex Head Bolts with Springs. (see sketch) used on 8 o’clock CRT assembly, are “NOT” Adjustment Screws 4 o’clock DO NOT LOOSEN-FLUID LEAKAGE WILL OCCUR. 4 Screws 4 Screws Lens Assembly CRT Assembly CRT Anode Cap Assembly S.V.M. Coil CRT Mounting CRT DRIVE Board Deflection Yoke and Conver Yoke Lens and Neck Components V
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TO REMOVE CRT (Same procedure for R, G, B) 1. Remove CRT DRIVE Board, S. V. M. COIL and DEF. YOKE from CRT. 2. Remove Lens Assembly. 3. Detach CRT Anode Cap from CRT. 4. Remove CRT Assembly from CRT Mounting. Anode Cap CRT REPLACEMENT (Same procedure for R, G, B) Reverse the removal procedures except the followings. 1. Anode Cable should be replaced with new one. See “SERVICING PRECAUTIONS” shown below. 2. Install silicon (T461B) to the CRT, replace the Anode cable and put enough silicon again o
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WARNING : BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRE- CAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL. PICTURE TUBE COMPONENTS ADJUSTMENT DESCRIPTION OF NECK COMPONENTS TILT ADJUSTMENT Rotate R, G, B deflection yoke so that picture becomes 1 2 horizon, then fasten screw. CENTERING ADJUSTMENT 1. Stretch a thread between two center slots of screen edge (top and bottom, left and right). 1 Deflection yoke and convergence yoke The position on th
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LOCATION OF SCREEN AND FOCUS VR’S SCREEN VR FOCUS VR RG B – 7 – SPECIFIC INFORMATIONS GENERAL ADJUSTMENTS
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REPLACEMENT OF THE CRT Service parts are provided for each R, G and B. The contents of the parts are as follows. RG B 50A50 23796001 23005397 23796003 50A60 23005114 23005115 ↑ HITACHI 55A60 23005242 ↑↑ CRT 61A60 23005249 ↑ 23796486 REPLACEMENT OF HIGH VOLTAGE CABLE 1. When replacing Anode Lead or Anode Cap with new one, remove Lead Holder from old lead as shown in ANODE LEAD figure below, and put it on new lead. Do not throw away Lead Holder. NOTE : THE LEAD HOLDER IS ATTACHED TO TPA5007 (Z450)
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SERVICE MODE 1. ENTERING TO SERVICE MODE 1) Press MUTE button once 2) Press MUTE button 3) While pressing the MUTE button, on Remote Control. again to keep pressing. press MENU button on TV set. S MUTE (Service mode display) 2. DISPLAYING THE ADJUSTMENT MENU 1) Press MENU button on TV. Service mode Adjustment mode Item Press S Data Press 3. KEY FUNCTION IN THE SERVICE MODE The following key entry during display of adjustment menu provides special functions. Screen adjustment mode ON/OFF: TV (
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4. SELECTING THE ADJUSTING ITEMS 1) Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2. (t button for reverse order) Refer to table-2 for preset data of adjustment mode. (See SETTING & ADJUSTING DATA on page 17) 5. ADJUSTING THE DATA 1) Pressing of VOLUME s or t button will cahnge the value of data in the range from 00H to FFH. The variable range depends on the adjusting item. 6. EXIT FROM SERVICE MODE 1) Pressing POWER button to turn
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ELECTRICAL ADJUSTMENT ITEM ADJUSTMENT PROCEDURE VERTICAL POSITION (VCEN) 1. Call up the adjustment mode display, then select item VCEN. 2. Press the VOLUME s or t button to get the voltage +30 ±10 mV. 3. Measuring method of voltage as follows. TP-V (on SIGNAL board) DIGITAL VOLT METER TP-G C (on SIGNAL board) SUB-BRIGHTNESS 1. Constrict the picture height until the (BRTC) vertical retrace line appears adjusting the HEIGHT control on the MAIN board. 2. Adjust the CONTRAST to the minimum and BRIG
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ITEM ADJUSTMENT PROCEDURE HEIGHT 1. Call up the adjustment mode display, then select the item HIT. (HIT) 2. Press the VOLUME s or t button to get the picture so the top of raster begins to lack. 3. Press the VOLUME s button to advance the data by 10 steps. Note : Check the vertical picture position is correct. WIDTH 1. Call up the adjustment mode display, then select the item WID. (WID) 2. Press the VOLUME s or t button to get the picture so the left and right edges of raster begins to lack. 3.
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CONVERGENCE ADJUSTMENT Adjust convergence from center to circumference in order. 1. Select the adjustment mode following the steps on page 9. RCUT 40H KEY FUNCTION IN THE CONVERGENCE ADJUSTMENT: Up : 2 button Selet Green color: 3 button Left : 4 button Blinking of cursor ON/OFF: 5 button 2. Press “7” button to display the built-in cross-hatch pattern. Right: 6 button 27.5 Adjust mode ON/OFF: 7 button Down: 8 button Erase Green line: 0 button Erase Red line: 100 button Cursor Erase Blue line: CHR
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NOTES In many cases, color misconvergence may be corrected by returning HIT and WID data in main deflection side to initial adjusting values. Following cases will surely require readjustment of convergence. CRT REPLACEMENT When CRT is replaced, main deflection readjustment and color matching are required. Perform following procedures. 1. Replace two CRT’s of blue and red. 2. Perform horizontal adjustment for blue and red yokes on base of green CRT data. Mount yoke and velocity mod. coil align- m
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SCREEN AND MIRROR ALIGNMENTS ASSEMBLING OF MOUNTING OF FRONT SCREEN FRONT SCREEN 5 screws Fresnel sheet 3 screws Protect shield FRONT 3 screws (for 50”) Lenticular sheet 3 screws Protect shield FRONT Fresnel sheet Stick cotton cloth tape Label with part Label with part number number (for 55”, 61”) Lenticular sheet Protect shield Stick contton cloth tape 4 screws FRONT Fresnel sheet Label with part Please refer to Mechanical Disassembly on page 23. Label with part * number number CAUTION : Do
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CIRCUIT CHECKS HIGH VOLTAGE CHECK FS CIRCUIT CHECK CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on The Fail Safe (FS) circuit check is indispensable for the final this chassis. Checking should be done following check in servicing. Checking should be done following the the steps below. steps below. 1. Connect an accurate high voltage meter to the anode of 1. Turn the receiver on. the picture tube. 2. Temporarily short TP- (R) and TP- (X) on the DEF/POWER 2. Turn on the receiver. Set the BR
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CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 43", 50", 55", 61" HIGH VOLTAGE AT ZERO BEAM: (A) 31.3 kV MAX HIGH VOLTAGE: (B) 32.4 kV Table-1 SERVICE MODE ADJUSTING ITEMS AND DATA IN THE SERVICE MODE: Item Name of adjustment Preset Date Item Name of adjustment Preset Date RCUT R CUTOFF 40H ← VCP V-COMPENSATE 0AH ← GCUT G CUTOFF 40H ← PARA E-W PARABOLA (DPC) 29H ← 08H BCUT B CUTOFF 40H ← CNR E-W CORNER ← GDRV G DRIVE 40H ← TRAP TRAPEZIUM 10H ← BDRV B DRIV
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LOCATION OF CONTROLS (Representative : 50A60) TV front Behind the door CH MENU EXIT TV/VIDEO DEMO AUDIO S-VIDEO VOL VOL POWER VIDEO L/MONO R CH Video Audio inputs POWER VOLUMET S EXIT DEMO MENU CHANNEL st TV/VIDEO TV rear ANT (75Ω) ANT-1 AUDIO CENTER CHANNEL IN OUT ON OFF OUT S-VIDEO R L VAR ANT-2 AUDIO Y VIDEO VIDEO L/ C L B MONO L/ MONO AUDIO AUDIO R C R R R COLOR VIDEO-1 VIDEO-2 STREAM AUDIO INPUT IN DVD IN OUT – 18 – SPECIFIC INFORMATIONS GENERAL ADJUSTMENTS
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MENU RESET Remote Control LIGHT RECALL LIGHT RECALL POWER POWER TV/CABLE/VCR switch TV MUTE TV/VIDEO TIMER CABLE Set to “TV” to control the TV. TIMER VCR MUTE TV/VIDEO 2 3 1 CHANNEL s/t CH 4 5 6 Channel Number 8 9 7 VOLUME s/t VOL CH RTN 100 0 ENT CH RTN C. CAPT ADV/ PIP CH MENU ENTER PIP CH s FAV t FAV FAV s ENTER FAV s/t/T/S RESET EXIT ADV/ PIP CH t PIP CH STOP SOURCE PLAY PIP PIP functions REC TV/VCR REW FF (For “TV” and “CABLE” modes) STILL LOCATE SWAP – 19 – C.CAPT EXIT SPECIFIC INFORMATION
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PROGRAMMING CHANNEL MEMORY The channel memory is the list of TV channel numbers the TV tunes in when you press the CHANNEL s or t button. First, use the TV/CABLE and CH PROGRAM functions to preset all active channels in your area automatically. If necessary, arrange the preset channels with the ADD/ERASE functions so that you can tune into only desired channels. Note: If you utilize both ANT-1 and ANT-2 terminals for some model, perform programming channels for each input source. TV/CABLE functi
