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Instruction Manual
SERVICE MANUAL
42'' PLASMA DISPLAY MONITOR
CONTENTS
! SPECIFICATIONS ･････････････････ ･･････････ ･･･ ･･
･･･････ ･･････････ ･･････････ ･･ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･
･･･････ ･･････････ ･･････････ ･･ ･･･
･･･････ ･･････････ ･･････････ ･･･ ･･
★ OPERATING INSTRUCTIONS(Appendix) ･･･････････ ････ ･･ ････ ････ ･･ ･･･ ･･
! SAFETY PRECAUTIONS ･････････････ ････････ ････ ･････ ･･
! MAIN DIFFERENCE LIST ･････････････ ････････ ････ ･････ ･･
! TECHNICAL INFORMATION ･･ ･･･ ････････････ ･･ ････ ･･ ････ ･･･
! PRECAUTIONS FOR USE ･･･････ ････････････ ･･ ････ ･･ ･･･ ･･
! SPECIFIC SERVICE INSTRUCTIONS ･････････ ･･ ････ ･･ ････ ････ ･･ ･･･ ･･
! SERVICE ADJUSTMENTS ･･･････ ････････････ ･･ ････ ･･ ･･･ ･･
★ STANDARD CIRCUIT DIAGRAM(Appendix) ･･･ ･･ ････ ･･ ････ ････ ･･ ････ ････ ･･･
! PARTS LIST ･･･････････ ･･････････ ･･･････････
･･･････････ ･･････････ ････････ ･･･ ･･･ ･･････ ････ ･･････ ････ ･･････ ･･･
･･･････････ ･･････････ ･･･････････
･･･････････ ･･････････ ････････ ･･･
! SPECIFICATION(Pin assigment / Dimensions) ･･･ ･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･･ ･･
1
GM-P421U
GM-P420UG
･････････ ････ ････ ･･ ････ ････ ･･ ･･･ ･･ ･･･ ････
･････････ ････ ････ ･･ ････ ････ ･･ ･･･
･･･････････ ････ ･･ ････ ････ ･･ ･･･ ･･
･･･ ････････････ ････････ ････ ･･ ･ ･････ ･･････ ････ ･･････ ････
･････････････ ････････ ････ ･････ ･･
･･･ ････････････ ････････ ････ ･･ ･ ･･
･･･ ････････････ ････････ ････ ･･ ･ ･････ ･･････ ････ ･･････ ････
･･･ ････････････ ････････ ････ ･･ ･ ･･
･････････････ ････････ ････ ･････ ･･
･･･････ ･･ ････････････ ･･ ････ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ･
･･ ･･･ ････････････ ･･ ････ ･･ ････ ･･･
･･･････ ･･ ････････････ ･･ ････ ･･･ ･･
･････････ ･･ ････････････ ･･ ････ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ･
･････････ ･･ ････････････ ･･ ････ ･･･
･･･････ ････････････ ･･ ････ ･･ ･･･ ･･
･･ ･･･ ････････ ････ ･･ ････ ････ ･･ ･ ･････ ･･････ ･･･
･･･ ････････ ････ ･･････ ････ ･････ ･･
･･ ･･･ ････････ ････ ･･ ････ ････ ･･ ･ ･･
･････････ ･･ ････････････ ･･ ････ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････
･････････ ･･ ････････････ ･･ ････ ･･･
･･･････ ････････････ ･･ ････ ･･ ･･･ ･･
･･ ･･･ ･･ ･･ ････ ････ ･･ ････ ････ ･･ ･ ･････ ･･･
･･ ･･･ ･･ ･･ ････ ････ ･･ ････ ････ ･･ ･ ･･
･････ ････ ･･････ ････ ･･････ ････ ･･･
CO PYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
･･･ ･･････ ････ ･･････ ････ ･･････ 2
･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･
･･･ ･･････ ････ ･･････ ････ ･･････
･･･ ････ ････ ･･ ････ ････ ･･ 4
･･･ ････ ････ ･･ ････ ････ ･･
･･ ･ ･･ ････ ････ ･･ ････ ････
･･･ ････ ････ ･･ ････ ････ ･･ 5
･･･ ････ ････ ･･ ････ ････ ･･
･･ ･ ･･ ････ ････ ･･ ････ ････
･･･ ････ ････ ･･ ････ ･･･ 6
･･･ ････ ････ ･･ ････ ･･･
･･ ･･･ ････ ･･････ ････ ･
･･ ･ ･･ ････ ････ ･･ ････ ･･･ 8
･･ ･ ･･ ････ ････ ･･ ････ ･･･
･･ ･････ ････ ･･････ ････ ･
･･ ･ ･･ ････ ････ ･･ ････ ･･ 35
･･ ･ ･･ ････ ････ ･･ ････ ･･
･･ ･････ ････ ･･････ ････
･･ ･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･･ 51
･･ ･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･･
･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･ ･ ･･
･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･ ･ ･･
･･･ ････ ･･ ････ ････ ･･ ････ ････ ･･ ･ ･････ ･
･･･ ･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･･ ･･
GM-P421U
GM-P420UG
BASIC CHASSIS
S3
･･･ ････ ･･ 1-1
･･ ･･･ ････
･･･ ････ ･･
･･･ ････ ････ ･ 11
･･ ･･･ ･･ ････ ･
･･･ ･･････ ･･･
･･ ･･･ ･ 2-1
･･ ･･･ ･
･･･ ･･･
･･･ ･ 75
･･ ･･
･･ ･･
No.51957
May 2002
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Summary of Contents for JVC GM-P421U
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Page 1: Table Of Contents
GM-P421U GM-P420UG SERVICE MANUAL 42'' PLASMA DISPLAY MONITOR GM-P421U BASIC CHASSIS GM-P420UG CONTENTS ! SPECIFICATIONS ･････････････････ ･･････････ ･･･ ･･ ･･･ ･･････ ････ ･･････ ････ ･･････ 2 ･･･････ ･･････････ ･･････････ ･･ ･･･ ･･･････ ･･････････ ･･････････ ･･･ ･･ ･･･････ ･･････････ ･･････････ ･･ ･･･ ･･ ･･･ ･･ ････ ････ ･･ ････ ････ ･･ ･･... -
Page 2: Specifications
・MAKE : Mini DIN 4pin ・ WIRED : Stereo mini jack terminal × 2 OPTION Use exc lusively for JVC’s optional parts SPEAKER OUT Impedance 6Ω～ 16Ω(L/R) AUDIO OUT Pin jack terminal×2(L/R), Outout impedance 600Ω Remote control unit × 1(RM-C576), AA/R6-size dry cell battery × 2(for operation check) Accessories Remote control cable×1, Power cord (approx 2.5m)×3... - Page 3 GM-P421U GM-P420UG TIMING SPECIFICATION & SCAN SIZ E Input picture format Scan size Frequenc y Total pixel Visible area pixel Scan size Divide Item Vert. Hori. Hori. Vert. Hori. Vert. Vert. Vert. Display clock Standard mode pixel/line line/frame pixel/line line/frame regular 95.00...
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Page 4: Safety Precautions
＜ GM-P421U GM-P420UG SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many 7. Isolation Check circuits and components specially for safety purposes. For (Safety for Electrical Shock Hazard) continued protection, no changes should be made to the original After re-ass embling the product, always perform an isolation design unless authorized in writing by the manufacturer. -
Page 5: Main Difference List
GM-P421U GM-P420UG MAIN DIFFERENCE LIST The differences between these two models are its color and class of EMC : GM-P421U is silver and is categorized in class B, while GM-P420UG is gray and is categorized in class A. GM-P421U(Silver) GM-P420UG(Gray) PARTS NAME "... -
Page 6: Technical Information
GM-P421U GM-P420UG TECHNICAL INFORMATION PDP (PLASMA DISPLAY PANEL) DESCRIPTION CAUTION Although a PDP is made with highly advanced precis ion, this does not neces sarily mean all of the cells operate correctly. The PDP inevitably includes c ell that do not light or light constantly. - Page 7 GM-P421U GM-P420UG PIXEL FAULT There are two pixel faults - bright fault and dark fault - that are respectively defined as follows. (1) BRIGHT FAULT In this pixel fault, a c ell that should not light originally is lighting or flashing on and off.
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Page 8: Precautions For Use
GM-P421U GM-P420UG PRECAUTIONS FOR USE 1. Safety precaution for PDP operation 3. Retained-Image and burning (1) Do not prevent the radiation of heat from back, top and flank When the s ame pattern is displayed continuously for many hours, sides of a PDP. (Refer to "5. Requirements for setting".) - Page 9 GM-P421U GM-P420UG 5. Requirements for setting The following minimum spac e must be kept when a PDP is installed. (The rec ommended distance should be from the most projected portion when a PDP is inc lined.) Methods of Front Flank...
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Page 10: Other Precautions
GM-P421U GM-P420UG 6. Optical filter (Front filter) 9. Precaution during changing of armor parts (rear cover, front panel and optical (front) filter) (1) Don't expose the optical filter directly to the sun for a long period of time. ● Extreme care must be ex ercis ed for a PDP when the armor Exposing directly to the sun for a long period of time may parts are changed. -
Page 11: Specific Service Instructions
GM-P421U GM-P420UG SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE BACK COVER • CAUTION (× × × × 11) Be sure to disconnect the power c ord from the AC outlet before disass embly and reassembly. Use care sinc e unless the power... - Page 12 GM-P421U GM-P420UG [4] REMOVING THE SP TERMINAL COVER POWER RGB INPUT VIDEO INPUT &SHIELD COVER ＊ After removing the back c over, side cover & terminal brack et. 1. Remove the 4 screws marked ! ! as s hown in Fig.4.
- Page 13 GM-P421U GM-P420UG [7] REMOVING THE PDP BLOCK ＊ After removing the chassis base. 1. Remove the 4 screws marked !' !' as shown in Fig.7. PDP BLOCK 2. Withdraw the PDP BLOCK toward you. ＊ Replacement of the PDP BLOCK should be performed by2 or ( ×...
- Page 14 GM-P421U GM-P420UG REPLACEMENT OF MEMORY ICs 1. MEMORY IC This model uses memory IC. In the memory IC is memorized data for correctly operating the video-chroma and deflection circuits. When replacing the memory IC, be sure to use IC written with the initial values of data.
- Page 15 GM-P421U GM-P420UG 5. PROCEDURE FOR SERVICE MENU (1) ADJUSTMENT ITEM OF SERVICE MENU With the SERVICE MENU, various settings can be made, and they are broadly class ified in the following items of adjustments. S ････(SIGNAL BLOCK) E････ (ENHANCER BLOCK) W ･･･(W HITE BALANCE)
- Page 16 GM-P421U GM-P420UG INITIAL SETTING CONTENTS / RANGE OF THE SET-UP MENU Setting Item Setting content / Range Initial Setting CONTROL LOCK STATUS DISPLAY MODE1 MODE2 MODE3 MODE4 REMOT E SWITCH1 MODE1 MODE6 MODE5 HD SIGNAL MODE 1080i 1035i 1080i PIXEL SHIFT...
- Page 17 GM-P421U GM-P420UG ■ INITIALIZATION OF SELF-DIAGNOSIS Fig. 1 Fig. 2 ＜ ＜ ＜ ＜ FOR CHECKING THE DIAGNOSIS HISTORY ＞ ＞ ＞ ＞ 1. Enter the SERVICE MENU as shown Fig. 1. 2. Display the sec ond page by pressing the SELECT : ▲ key or ▼...
- Page 18 GM-P421U GM-P420UG ■ INITIALIZATION OF ELAPSED TIME Fig. 1 Fig. 2 1. Enter the SERVICE MENU (Fig. 1) . 2. Display the sec ond page by press ing the SELECT : ▲ key and ▼ key. 3. After moving the cursor to HOUR METER BLOCK (Fig. 2), press the ENTER : key.
- Page 19 GM-P421U GM-P420UG INITIAL SETTING VALUE OF THE SERVICE MENU WHITE BALANCE BLOCK SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE RGB PC HIGH COMPO. H IGH DRIVE (R) W(A01) DRIVE (R) W(G01) DRIVE (G) W(A02) DRIVE (G) W(G02)
- Page 20 GM-P421U GM-P420UG CPU BLOCK SETTING SETTING SETTING SETTING SETTING ITEM SETTINNG ITEM VALE VALE PANORAM A DATA reserved C(C26) INPUT PIXELS C(A01) HORI POS MIN C(C27) -100 OUTPUT PIXELS C(A02) HORI POS MAX C(C28) NL ST AR T C(A03) VERT POS MIN...
- Page 21 GM-P421U GM-P420UG SETTING SETTING SETINNG SETING SETTING ITE M SETTING ITE M VALE VALE APS CONTROL DATA C(G21) Is COMPENSAT ION C(G01) C(G22) Is STANDAR D C(G02) C(G23) APS PANEL IN MOD C(G03) C(G24) LEVEL ADJ C(G04) C(G25) AGC ON /OFF...
- Page 22 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE VIDEO-60Hz (FULL) VIDEO-60Hz (ZOOM ) FB COUNTER 1 D(B01) FB COUNTER 1 D(C01) FB COUNTER 2 D(B02) FB COUNTER 2 D(C02) VC O DIVIDE D(B03) VC O DIVIDE...
- Page 23 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE VIDEO-60Hz (PANORA.) VIDEO-50Hz (REGULAR) FB COUNTER 1 D(D01) FB COUNTER 1 D(E01) FB COUNTER 2 D(D02) FB COUNTER 2 D(E02) VC O DIVIDE D(D03) VC O DIVIDE D(E03)
- Page 24 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE VIDEO-50Hz (FUL L) VIDEO-50Hz (Z OOM) FB COUNT ER 1 D(F01) FB COUNT ER 1 D(G01) FB COUNT ER 2 D(F02) FB COUNT ER 2 D(G02) VCO DIVIDE...
- Page 25 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE VIDEO-50Hz (PANORA.) FB COUNT ER 1 D(H01) V SYNC SOURCE D(H27) FB COUNT ER 2 D(H02) VSYNC CYCLE(L) D(H28) VC O DIVIDE D(H03) VSYNC CYCLE(H) D(H29) CHARGE PUMP...
- Page 26 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE COM PO. NTSC REGULAR P(B01) 480i REGULAR P(C 01) +002 NTSC FULL P(B02) 480i FULL P(C 02) +002 NTSC ZOOM P(B03) 480i ZOOM P(C 03) +002 NTSC PANORAMIC...
- Page 27 GM-P421U GM-P420UG PRIMING CO DING BLO CK SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE VIDEO 50Hz VIDEO -NTSC CODIN G SELECT B(A01) S(A01) PRIMING CONT B(A02) SUB BRIGHT S(A02) GAMM ER B(A03) SHARPN ESS S(A03) DITHER B(A04)
- Page 28 GM-P421U GM-P420UG S E T TIN G S E T TIN G S E T TIN G S E T TIN G S E T TIN G IT E M S E T TIN G IT E M V A L E...
- Page 29 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE I(A55) I(A11) sc aler1/2 nonlinear s caling SOFT MIXER CONT ROL I(A56) coefficient I(A12) I(A57) I(A13) SOFT MIXER CONT ROL sc aler1 window c ontrols I(A58) I(A14) I(A59)
- Page 30 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE CXA3506R PEM BRANDT-I I(B01) I(D01) VCOD IV1 n, m(L) OU TPUT C ONT ROL VCOD IV2 m(H) I(B02) CONFIG I(D02) DELAY I(B03) ADDR C LEAR 0 I(D03) Charge Punp...
- Page 31 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE VDSCALER T OUT X H I(D56) DIN FILTER GRP/C4 I(D11) VDSCALER C ONT ROL I(D57) DIN FILTER GRP/C5 I(D12) VDSCALER D ELTAX L I(D58) DIN FILTER GRP/C6 I(D13)
- Page 32 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE LUT Y I(D66) OSDB CON TROL I(D21) LUT U I(D67) KEYSTONE CONTROL I(D22) LUT V I(D68) KEYSTONE LINES I(D23) LUT R L I(D69) DIT HER CONTR OL I(D24)
- Page 33 GM-P421U GM-P420UG SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE LINE LENG GRP/VIDEO H I(D76) MSR AOI GRP/PIXEL END L I(D31) LINE LENG GRP/DATA L I(D77) LINE LENG GRP/DATA H I(D78) MSR AOI GRP/PIXEL END H I(D32) LINE LENG GRP/ID AT A L...
- Page 34 GM-P421U GM-P420UG ENHACER BLOCK SETTING SETTING SETTING SETTING SETTING ITEM SETTING ITEM VALE VALE PDP I/F VIDEO DIT HER I(E01) FILTER C OEFF C0 E(A01) VERT START POS H I(E02) FILTER C OEFF C1 E(A02) VERT START POS L I(E03)
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Page 35: Service Adjustments
GM-P421U GM-P420UG SERVICE ADJUSTMENTS BEFORE ADJUSTMENT 1. There are 2 ways of adjusting th is monitor : On e is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components. 2. The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of th e initial setting values. - Page 36 GM-P421U GM-P420UG SERVICE MENU FLOW CHART No. 51957...
- Page 37 GM-P421U GM-P420UG WIRING ADJUSTMENT LOCATIONS PDP BLOCK No. 51957...
- Page 38 GM-P421U GM-P420UG CHASSIS BASE No. 51957...
- Page 39 GM-P421U GM-P420UG ■ ■ ■ ■ ADJUSTMENT Ad justment Item Test equipment Test points Ad justment procedur e locations POWER Digital CNT P connector VR551 * Make sure that NO SYNC is displayed when the power is (Vd / Vs)
- Page 40 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations AD INPUT Oscilloscope TP-PR WG11 1. Input the 1080i whole black video signal to the COMPONENT offset (1080i) TP-PB WG13 terminal. adjustment Video signal (MAIN PWB) 2.
- Page 41 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations RGB offset Oscilloscope CH01 1. Input the 480i video signal ramp pattern to the COMPONENT (480i) WE04 terminal. adjustment NT SC (480i) (R cut off) 2. Change the value in the ＜ SERVICE MENU ＞ CH01 from “0”...
- Page 42 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations RGB offset Oscilloscope CH01 * VGA signal 640 × 480 dots (Ramp pattern) (VGA) WA04 Horizontal Frequency : 31.5kHz adjustment PC Video (R cut off) Vertic al frequency : 60Hz...
- Page 43 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations WHITE Video signal WC01 * Carry out aging for more than 20 minutes. When the AC is input BALANCE gener ator (R DRIVE) again, wait for more than 5 minutes before mak ing adjustments.
- Page 44 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations WHITE Video signal WE01 * Carry out aging for more than 20 minutes. When the AC is input BALANCE gener ator (R DRIVE) again, wait for more than 5 minutes before mak ing adjustments.
- Page 45 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations WHITE Video signal WG01 * Carry out aging for more than 20 minutes. When the AC is input BALANCE gener ator (R DRIVE) again, wait for more than 5 minutes before mak ing adjustments.
- Page 46 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations WHITE Video signal WA01 * Carry out aging for more than 20 minutes. When the AC is input BALANCE gener ator (R DRIVE) again, wait for more than 5 minutes before mak ing adjustments.
- Page 47 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations WHITE PC Video WI01 * Carry out aging for more than 20 minutes. When the AC is input BALANCE signal (R DRIVE) again, wait for more than 5 minutes before making adjustments.
- Page 48 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations Br ight (NTSC) PC Video WC07 * White balance adjustment should be carried out beforehand. adjustment signal * The PICTURE ADJ. in the MAIN MENU should be initialized.
- Page 49 GM-P421U GM-P420UG Ad justment Item Test equipment Test points Ad justment procedur e locations Br ight (1080i) Video signal WG07 * White balance adjustment should be carried out beforehand. adjustment gener ator * The PICTURE ADJ. in the MAIN MENU should be initialized.
- Page 50 GM-P421U GM-P420UG REPLACEMENT OF 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.