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SERVICE MANUAL
CONTENTS
! SPECIFICATIONS ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･ ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･
! SAFETY PRECAUTIONS ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
! FEATURES･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･ ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
! MAIN DIFFERENCE LIST ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
! SPECIFIC SERVICE INSTRUCTIONS ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
! SERVICE ADJUSTMENTS ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
! PARTS LIST ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ････ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
★ STANDARD CIRCUIT DIAGRAM ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
1
COLOUR TELEVISION
AV28CH1EUS
AV28CH1EUB
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ････ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･
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･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
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･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ････ ･ ･･ ･･ ･･ ･･ ･･
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･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･ ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ････ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･
CO PYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ 2
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･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･ ･ ･ ･ ･ 31
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･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･ 2-1
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AV28 CH1 EUS
AV28 CH1 EUB
BASIC CHASSIS
MF
･･･ 5
･･ ･
･･･
･･ ･ ･･ ･･ ･･ ･･ ･･ 6
･･ ･ ･･ ･･ ･･ ･･ ･･
･･ ･ ･･ ･･ ･･ ･･ ･･
No.51944
Mar. 2002
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Summary of Contents for JVC AV28CH1EUS
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Page 1: Table Of Contents
AV28 CH1 EUB SERVICE MANUAL COLOUR TELEVISION BASIC CHASSIS AV28CH1EUS AV28CH1EUB CONTENTS ! SPECIFICATIONS ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･ ･･ ･･ ･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ ･･ 2 ･･... -
Page 2: Specifications
AUDIO OUT (Variable) (RCA pin jack×2) Headphone jack Stereo mini jac k (φ3.5mm ) Remote Contr ol Unit RM-C54H (AAA/R03 dry battery×2) : (AV28CH1EUS) / RM-C50(AAA/R03 dry battery×2) : (AV28CH1EUB) Design & specifications are subject to change without notice No.51944... - Page 3 AV28CH1EUS AV28CH1EUB ■ ■ ■ ■ 21-pin Euro connector (SCART socket) : EXT-1 / EXT-2 / EXT-3 (P-P= Peak to Peak, B-W= Blanking to white peak) Signal Designation Matching Value EXT-1 EXT-2 EXT-3 No . AUDIO R output 500mVrms(Nominal), ○...
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Page 4: Safety Precautions
AV28CH1EUS AV28CH1EUB SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many 9. 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: Features
AV28CH1EUS AV28CH1EUB FEATURES " New chassis design enable us e of an interac tive on screen " Users can make VCR dubbing of picture and sound by controlling control. the AV selec tor to select an optional sourc e at the EXT-2 output "... -
Page 6: Specific Service Instructions
AV28CH1EUS AV28CH1EUB SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY PROCEDURE REMOVING THE REAR COVER 1. Unplug the power c ord. 2. Remove the 14 screws marked as shown in the Fig. 1. 3. Withdraw the rear cover toward you. REMOVING THE CHASSIS " After removing the rear cover. - Page 7 AV28CH1EUS AV28CH1EUB FRONT CABINET SPEAKER SOCKET MICON PWB FRONT CONT ROL 100Hz PWB POWER & DEF. PWB CLAW CHASSIS AV TERMINAL BOARD CONT ROL BASE MAIN PWB CLAW REAR COVER AV SW PWB Fig. 1 No.51944...
- Page 8 AV28CH1EUS AV28CH1EUB REMOVING THE CRT ∗ Replacement of the CRT should be performed by 2 or more pers ons. CRT CHANGE TABLE • After removing the c over, chassis etc., 1. Putting the CRT c hange table on soft cloth, the CRT change table should also be c overed with s uch soft cloth (shown in Fig.3).
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Page 9: Replacement Of Chip Component
AV28CH1EUS AV28CH1EUB 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. - Page 10 AV28CH1EUS AV28CH1EUB REPLACEMENT OF MEMORY ICs 1. Memory ICs This TV us e memory ICs. In the memory ICs, there are memorized data for correctly operating the video and deflection circuits . When replacing memory ICs, be s ure to us e ICs written with the initial values of data.
- Page 11 AV28CH1EUS AV28CH1EUB SETTING VALUES OF SYSTEM CONSTANT SET (TABLE 1) Setting item Setting item Setting content Setting value Setting content Setting value DESTINATION DOLBY 16:9 CRT TYPE 16:9 PURITY PROGRESSIVE PICTURE TILT TDA9178 DIGIPURE PRO TONE IC 1TUNER 2TUNER FLAT PIC&TEXT...
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Page 12: Service Adjustments
AV28CH1EUS AV28CH1EUB SERVICE ADJUSTMENTS BEFORE STARTING SERVICE ADJUSTMENT 1. There ar e 2 ways of adjusting this TV: One is with the 7. Preparation for adjustment (pres etting): REMOTE CONTROL UNIT and the other is the conventional Unless otherwis e specified in the adjustment items, preset the method using adjustment parts and components. - Page 13 AV28CH1EUS AV28CH1EUB ADJUSTMENT LOCATIONS FRONT FRONT CO NTRO L PW B SP L F90 1 SP R CN001 POWER SW FRONT FRONT MAIN PW B PO WE R&DEF PW B CN002 IC701 IC702 MEMORY 100Hz PWB AV SEL PWB MICOM PWB...
- Page 14 AV28CH1EUS AV28CH1EUB BASIC OPERATION SERVICE MENU 1. TOOL OF SERVICE MENU OPERATION Operate the SERVICE MENU with the REMOTE CONTROL UNIT. 2. SERVICE MENU ITEMS With the SERVICE MENU, various settings (adjustments) c an be made, and they are broadly c lassified in the following items of settings (adjus tments ): (1) 1.
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Page 15: Service Menu
AV28CH1EUS AV28CH1EUB SERVICE MENU SERVICE MENU 1. I F 2. V /C 3. A UDIO 4. DE F 5. V S M PR ES E T 6. S TA T US 7. P IP (OFF ) 8. - - - 9. - Page 16 AV28CH1EUS AV28CH1EUB (3) Method of Setting 1) Method of Setting 1.IF [VCO] ･･･････ ･････････････ ････････ It mus t not adjust without signal. ① 1 Key･･･････ ･････････････ ･････ Select 1.IF. ② 1 Key･･･････ ･････････････ ･････ Select 1.VCO(CW) Make s ure that the arrow position between the ABOVE REF and BELOW REF.
- Page 17 AV28CH1EUS AV28CH1EUB ADJUSTMENTS CHECK ITEM Measuring Item Test point Ad justment part Description instrument Check of B1 Signal TP-91(B1) 1.RGB BLK 1. Receive a any broadcast. generator Power Supply TP-E(# # # # ) 2. Push the “ZOOM” key and s elect the FULL mode.
- Page 18 AV28CH1EUS AV28CH1EUB ADJUSTMENT OF FOCUS & SCREEN Measuring Item Test point Ad justment part Description instrument DAd justment Signal FOCUS VR 1. Receive a cross -hatc h signal. Select FULL mode. gener ator [In HVT] 2. While watc hing the screen, adjust the FOCUS VR to make the FOCUS vertical and horizontal lines as fine and sharp as possible.
- Page 19 AV28CH1EUS AV28CH1EUB VIDEO / CHROMA CIRCUIT ADJUSTMENT The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the scr een to the optimum condition can be different from the initial setting values.
- Page 20 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument Ad justment Signal 2. WDR R " Set the PICTURE MODE to NORMAL. gener ator 3. WDR G Receive a black and white signal (colour off). WHITE 4. WDR B Select 2.V/C from the SERVICE MENU.
- Page 21 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument Ad justment Remote 7.COLOUR [Method of adjustm ent without m easuring instrument] control unit (PAL～ ～ ～ ～ NT SC) S UB CO LO UR Ⅰ Ⅰ Ⅰ Ⅰ...
- Page 22 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument Ad justment Signal TP-47B 7.COLOUR [Method of adjustm ent using measur ing instrument] TP-E( # # # # ) gener ator (PAL～ ～ ～ ～ NT SC) S UB CO LO UR Ⅱ Ⅱ Ⅱ Ⅱ...
- Page 23 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument Ad justment Remote 8.HUE [Method of adjustm ent without m easuring instrument] control unit SUB HUE Ⅰ Ⅰ Ⅰ Ⅰ NTSC 3.58 HUE [NTSC 3.58 HUE] 1. Input a NTSC 3.58MHz COMPOSITE VIDEO signal (full field colour bar with 75% white) from the EXT terminal.
- Page 24 AV28CH1EUS AV28CH1EUB DEFLECTION CIRCUIT ADJUSTMENT There are 4 aspect modes ( ① ① ① ① FULL, ② ② ② ② PANORAMIC, ③ ③ ③ ③ SUBTIT LE, ④ ④ ④ ④ COMPRES) of the adjustment ( 1 ) 100Hz i mode, ( 2 ) 120Hz i mode ････...
- Page 25 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument Ad justment Signal 1. V- SHIFT [FULL mode] of V-SHIFT gener ator 1. Receive a circle pattern signal of vertic al frequency 50Hz. 2. Select 4.DEF from the SERVICE MENU.
- Page 26 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument Ad justment of 3.H-CENT. 13. Receive a c ircle pattern s ignal. H.CENTER 14. Select 3.H-CENT and set the initial s etting value. 15. Adjust H-CENT to make C=D.
- Page 27 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument Ad justment Signal 5.TRAPEZ 26. Receive a cross -hatc h signal. gener ator of TRAPEZ 27. Select 5.TRAPEZ with the FUNCTION UP/DOWN key. Remote 28. Set the initial setting value of TRAPEZ with the FUNCT ION control unit - or + key.
- Page 28 AV28CH1EUS AV28CH1EUB Measuring Item Test point Ad justment part Description instrument 11.BOW • In case where there is a b ow-shaped d istortion of imag es on the Ad justment of screen. (Fig .B) 43. Select 11.BOWwith the FUNCTION UP/DOWN key.
- Page 29 AV28CH1EUS AV28CH1EUB AUDIO CIRCUIT ADJUSTMENT " Do not touch 3. AUDIO adjustment of the SERVICE MENU as it requires no adjustment. If values had changed for the some reas on, set the initial values in the following table. 3. AUDIO(Do not adjust)
- Page 30 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB BLOCK DIAGRAM HEADPHONE POWER IC665 MAIN PWB BASS IC662 R-OUT SP R IC101 TU001 IC601 IC663 MULTI SOUND TUNER POWER AMP PROCESSOR L-OUT SP L FRONT CTRL PWB (2/2) IC203 B-OUT IC202 VTV1 R-OUT IC551 L TV RTV...
- Page 31 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB CIRCUIT DIAGRAMS TO MICON PWB ASSY MAIN PWB CIRCUIT DIAGRAMS [1/2] TO 100Hz PWB ASSY TO AV SW PWB ASSY TO SYNC SEP PB CN0NS CN0R1 CN00C CH41171-006 CN0R3 CN0R2 CN007 CN001 CN003 CN0C2 QGB1505J1-50 QGB1505J1-50...
- Page 32 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB MAIN PWB CIRCUIT DIAGRAM [2/2] J001 K602 R642 C646 Q617 R650 MUTING -0.1V K601 Q615 C011 R643 MUTING C647 Y011 1.2V Q616 R651 R009 R644 MUTING R008 TU1_SW0 C639 C638 L004 NQL092K-100X TU1_SW1 Y010 C105 R655 3.7V...
- Page 33 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB POWER & DEF. PWB CIRCUIT DIAGRAM TO MAIN PWB ASSY CN006 CN004 CN005 QGB1506M1-16 QGB1506M1-16 QGB1506M1-16 X-RAY ! R591 R586 D584 D583 2.3V 1/4W FR 6.80k QRZ9017-4R7 EU2-T3 MTZJ7.5S-T2 Q583 Y901 X-RAY PROTECTOR RY931 TH901 C583...
- Page 34 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB 100Hz PWB CIRCUIT DIAGRAM V103BD *DEFFERENCE LIST SMF- SMF- SMF- SMF- SMF- 0Z005A-U2 0Z005A-U2 0Z005A-U2 0Z005A-U2 0Z005A-U2 100Hz PWB SMF0Z005A-U2 No.51944 No.51944 2-11 2-12...
- Page 35 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB MICON PWB CIRCUIT DIAGRAM CN0J1 CN0J2 R142 NOTE *1: 2SC2712/YG/-X *2: 2SA1162/YG/-X R143 *3: MA111-X *4: 2SK1374-X *5: MA3056/M/-X X: OPEN 0:00 C HIP BUS WIRE MICON PWB C058 R141 SMF0M003A-U2 TMODE C019 47/16 R139 2.2k...
- Page 36 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB FRONT CTRL PWB CIRCUIT DIAGRAM FRONT CTRL PWB SMF-8010A-U2 S001 QSW0619-003Z IC001 MENU R013 GP1U281Q J001 J003 QNZ0453-001 REMOCON RECEIVER QMS3004-C01 EXT-4 HEADPHONE JACK R039 CH DOWN R012 R4IN L4IN C004 CH UP R010 R008 NCB31CK-104X...
- Page 37 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB CRT SOCKET PWB CIRCUIT DIAGRAM NOTE 2SC2412K/QR/-X 2SA1037AK/QR/-X IC203 MA111-X CRT SOCKET PWB TDA6111Q B-OUT D210 BW:BUS WIRE SMF-3005A-U2 1SR124-400A-T2 :NON-MOUNT(OPEN) 9.7V 199V 121.7 121.3V QRC121K-152Z V 122.8 C203 R234 R237 NCF31CZ-104X 1.5k 3.3k TP-47B C206...
- Page 38 AV28CH1EUS AV28CH1EUS AV28CH1EUB AV28CH1EUB AV SW PWB CIRCUIT DIAGRAM C115 R130 10/50 R112 R131 C116 10/50 R113 -1.3V 0.1V A.MUTE AV SW PWB Q112 Q104 RTV1 Q105 MUTING DTC323TK-X EXT-1 DTC323TK-X -1.3V MUTING MUTING LTV1 R151 C138 100k C139 R101...