Zenith SERVICE MANUAL Product Type: Chassis Manual Part #: Model Line: Product Year: Model Series: Commercial Color TV CL 3828VD0171F H 2006 H27H38DT H32H38DT CONTENTS General Information/Remote Controls................................ 1 Installer ’s Menu ............................................................2 Servicing/Trobleshooting ................................................ 3 Model/Module Parts List ................................................. 4 Exploded Views .......................
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS IMPORTANT SAFETY NOTICE A.C. Voltmeter This Manual was prepared for use only by properly trained audio-visual service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics Corporation.
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS Observe the anode voltage meter reading and compare with the table below for the proper CRT screen size. If the voltage reading is higher than the maximum, verify circuit component values and proper operation. X-RADIATION To prevent possible exposure to x-radiation caused by excessive CRT anode voltage, the Digital CL chassis incorporate a “High Voltage Shutdown” circuit.
INSTALLERS MENU Use the Installer Menu to set up or change operational settings. See detailed descriptions of the Installer Menu items on the following pages Installer’s menu items can be accessed by using the optional installer’s remote control. Just press and hold MENU (about 8 seconds) until the menu disappears, then press 9, 8, 7, 6, then ENTER. To remove the Installer’s Menu, press ENTER repeatedly. Any changes you make will be stored in nonvolatile memory.
INSTALLERS MENU Installer Menu Items 26-I through 63-I Menu Function Item Value Range Default Value Brief Description of Function and Comments 28-I. CH OVER RIDE 0/1 1 When set to 0, limits direct access to favorite channels and locks Auto Program. 29-I. OLD OCV 0/1 0 OCV should set to 1. 30-I. ACK MASK 0/1 0 M.P.I. communication parameter. 31-I. POLL RATE 20 - 169 94 M.P.I. communication parameter. 32-I. TIMING PULSE 186 - 227 204 M.P.I . communication parameter. 34-I.
INSTALLERS MENU Installer Menu Items 64-I through 88-I Menu Function Item Value Range Default Value Brief Description of Function and Comments 64-I. FOR PTL M 0-7 6 Custom foreground color for the V-Chip (Parental Control) menu. 65-I. BCK PTL M 0-7 4 Custom background color for the V-Chip (Parental Control) menu. 66-I. EN SRC COL 0/1 0 Set to 1 to enable custom color for the Source menu. 67-I. FOR SRC M 0/7 3 Custom foreground color for the Source menu. 68-I.
INSTALLERS MENU Installer Menu Items 89-I through 103-I Menu Function Item Value Range Default Value Brief Description of Function and Comments 89-I. POKE ENABLE 0/1 0 When set to 1, writing to Non - volatile memory through M.P.I. is enabled. 90-I. KEY LOCK 0/1 0 When set to 1, front keyboard functionality is disabled. 0/1 1 When set to 1, Audio Mode Information is enabled to appear in the Channel Time Display. 100-I. ATSC TUNE MD 0/1 0 Sets ATSC tuning mode.
INSTALLERS MENU Detailed Descriptions for Installer Menu Items 4-I through 13-I PROGRAM. If some channels were not found by AUTO PROGRAM, select the appropriate AFC setting here and add the channels using the ADD/DEL/BLNK option in the Setup Menu. 4-I. STRT CHANNEL (Start Channel) Important: For NTSC start channel, item 101-I STRT MINOR CHANNEL, must be set to 0. When active, this function allows you to determine the initial channel number when the TV is turned ON.
INSTALLERS MENU Detailed Descriptions for Installer Menu Items 14-I through 36-I 14-I. NOT USED 15-I. SLEEP TIMER When set to 1, the Sleep Timer feature is available to the user (but no message is displayed prior to turn-off). When set to 0, the Sleep Timer is not functional. 16-I. EN. TIMER Set to 1, On/Off Timer functions are available to end user. Set to 0 to disable Timer functions. Note: Clock must be set in order to use Timers. TIP: Set Text Mode to 1 only if text is offered in your video system.
INSTALLERS MENU Detailed Descriptions for Installer Menu Items 37-I through 59-I 37-I. REAR Y-C EN. Set to 1 to enable the rear S-Video input. Set to 0 to disable the rear S-Video input. 51-I. DIS VCHIP M Set to 1 to disable V-Chip menu. V-Chip menu will not appear. Set to 0 to enable the V-Chip menu. 38-I. YPrPb EN. Set to 1 to enable rear Component Video input. Set to 0 to disable rear Component Video input. 52-I. DIS SOURCE M Set to 1 to disable Source menu. Source menu will not appear.
INSTALLERS MENU Detailed Descriptions for Installer Menu Items 60-I through 75-I 60-I. EN VIDEO COL Set to 1 to enable custom color settings for the Video menu. Set to 0 to disable custom color settings for the Video menu. 61-I. FOR VIDEO M (Video Menu Foreground Color) 0 = Black 3 = Yellow 6 = Cyan 1 = Red 4 = Blue 7 = White 2 = Green 5 = Violet 0 = Black 3 = Yellow 6 = Cyan 1 = Red 4 = Blue 7 = White 2 = Green 5 = Violet 69-I.
INSTALLERS MENU Detailed Descriptions for Installer Menu Items 76-I through 103-I 76-I. DEFEAT XDS Set to 1 to disable XDS display. Set to 0 to enable XDS display. XDS data (provided at the discretion of the broadcaster), is available only on analog channels. After a channel change, wait 5 seconds then press ENTER to see XDS data, if available. 77-I. NOT USED 78-I. UPN MSB User programmable number, most significant byte readable by M.P.I. command. 79-I.
FACTORY MENU DEFLECTION 1 0-F VL (Vertical Linearity) Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT. 1-F VA (Vertical Amplitud) Adjust so that the circle of a digital circle pattern may be located within the effective screen of the CPT. 2-F SC (Vertical S-Correction) Adjust so that all distance between each horizontal lines are to be the same.
FACTORY MENU 42-F AGCADJ1 Manual AGC Adjust for ADC1. Range : 0 to 63. 27-F TINT RF Internal Tint Control for RF input source. Range : -128 to 127. 43-F AGCADJ2 Manual AGC Adjust for ADC2. Range : 0 to 63. 28-F SCADJ Chroma Sub-Carrier adjust register. Range : 0 to 63. 44-F YUVMAT Color Matrix for component input. Range : 0 to 2. 29-F AGCMD Automatic Gain Control Method. Range : 0 to 3. 45-F YUV TINT Tint Control for YUV input. Range : -63 to 63.
FACTORY MENU 58-F VSATADJ Pr Chroma component saturation adjust. Range : 0 to 63. 74-F RF BLACK Brightness register to set the initial condition for Brightness final alignment. 59-F LPFOP Lines per Field Output.Only used for Freerun Mode. Range : 0 to 511. 75-F RF WHITE Contrast register to set the initial condition for Brightness final alignment. 60-F NAPPLOP Not Active Pixel Per Line Output. Range : 0 to 511. 76-F BRIGHTCH Register to tune the RF Brightness Adjust Channel.
FACTORY MENU 88-F ULBLK DIS Register to toggle between Black or ultrablack during Blanking. Range : 0,1. 103-F HBSO Horizontal Blanking Stop. Range : 0 to 1295 104-F VBST Vertical Blanking Start Line. Range : -127 to 343. 89-F PRED CH Register to Choose the default channel during Predominant Color Adjustment. 105-F VBSO Vertical Blanking Stop Line. Range : 4 to 343. 90-F R CUT Reference for Cutoff Red. Range : 0 to 511. 106-F OSD CNTR Analog Contrast for OSD and external RGB. Range : 0 to 511.
FACTORY MENU VIDEO-FI 8 115-F YCDEL YC Luminance Delay for Luminance/Chrominance Video input source. Range : -8 to 7. 129-F PKCF YC Peaking Filter Center Frequency for Luminance/ chrominance Video input source. Range : 0,1,2,3 116-F FIX G2 Register to set the default value of Brigh(Luma Offset) register during G2 adjustment. 130-F LTIG YC Luma Transient Improvement Gain for Y/C input source. Range : 0 to 15. 117-F VAR G2 Register to set the default value of INT_BRT register during G2 adjustment.
FACTORY MENU ITEM Deflection 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Deflection 2 15 16 17 18 19 20 21 22 23 Video-FI 1 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Video-FI 2 39 40 41 42 43 44 45 46 47 48 49 50 3828VD0171F Register Name Value (dec) VL VA SC VS HS EW ET EP CRNU CRNL BOW ANGLE CRNU6 CRNL6 EHTTH -70 -280 140 2 -53 -66 0 -74 0 0 0 0 10 12 150 Vertical Linearity Vertical Amplitude S-Correction Vertical Position Horizontal Position Horizontal Width Trapezoidal Pin Cushion Upper Corner Lower C
FACTORY MENU ITEM Register Name Value (dec) 51 52 53 Video-FI 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 Video-FI 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 Video-FI 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 Video-FI 99 100 RC YPBPR BC YPBPR GC YPBPR 254 254 254 Red cutoff offset for YPbPr input Blue cutoff offset for YPbPr input Green cutoff offset for YPbPr input YPBPROFS YFDEL UVDEL USATADJ VSATADJ LPFOP NAPPLOP HORPOS HORWIDTH VERPOS VERWIDTH HOUTDEL ON YDELMTCH BLEMODE 127 59 57 42 42 13
FACTORY MENU ITEM Register Name Value (dec) 101 NOOSDBCL 1 HBST HBSO VBST VBSO OSD CNTR OSD BRT TINT AUX TINT YC ACCLIM V IFCOMBRF IFCOMB V IFCOMBYC 1207 162 254 16 270 120 0 0 14 2 4 4 BCL function for analog RGB. Register to enable or disable the BCL function for OSD Horizontal Blanking Start. Horizontal Blanking Stop Vertical Blanking Start Line.
SERVICING GENERAL INFORMATION Servicing the Digital CL is the same as with other LG single-board chassis. If the set is dead, first check the standby and switched voltages. If the switched voltages do not appear, check the power “On” circuit. If the power supply is OK and the set will turn on, the Horizontal sweep circuit should be checked next. Is horizontal drive available from the video processor chip. If the sweep system does not start up, sweep-derived voltages will not be generated.
SERVICING SHUTDOWN CIRCUIT OPERATION The flyback pulse voltage from pin 10 of T402 (Flyback Transformer) is peak detected (rectified) by the action of diode D444 and capacitor C450. This form a DC voltage appearing on C450 representative of the CRT anode voltage (HV) produced by T402. This voltage is divided down by precision resistors R419, R423, R420 and R424. This lower voltage appears on the zener diode ZDX447; when this voltage exceeds by 0.
SERVICING This voltage varies from 1 to 30 volts depending of the tuned channel. IF SERVICING RF signal path is as follows: The first stage is the TV Tuner (TU100). This device tunes and down converts any input channel frequency to a fixed value of 45.75 MHZ for the Video RF carrier.
SERVICING ADJUSTMENT OF RGB CUTOFF Note: If the Main Module or the CRT has been replaced, G2 must be readjusted before adjusting the RGB Cutoff 1. Press INSTART KEY on 105-201M remote control to enter to Factory Menu. 2. With Zenith Remote (P/N MBR3447CT) or LG Remote (P/N MBR3447LG). Hold Menu button for just a sec onds until channel will be displayed. Enters 1, 9, 3, 7 “ENTER” buttons. 3. Connect the output of an NTSC generator to the an tenna input of the receiver.
SERVICING PURITY & CONVERGENCE SETUP PROCEDURE CONVERGENCE ADJUSTMENT 1. Release locking assembly. 2. Connect crosshatch generator to the receiver and adjust static (center) convergence as follows: a. Adjust the 4-pole static control by moving the two tabs separately to converge the red and blue lines horizontally. Move the two tabs to gether around the neck of the CRT (in a 45º arc) from the top-dead-center position to con verge the red and blue lines vertically. b.
SERVICING VERTICAL-TILT WEDGE ADJUSTMENT The vertical lines at 6 and 12 o’clock are converged by vertically tilting the yoke and inserting a wedge at the top of the yoke until it is firmly seated between the CRT glass and the horizontal coils. IMPROVING CRT CORNER PURITY CRTs that display corner purity problems even after following the service procedures can be modified with a picture correction kit. The purity can be improved by placing a picture-correction magnet (included in the kit) on the CRT funnel.
H27H38DT Exploded View 1 2 REF 1 2 3 4 5 6 7 3 4 DESCRIPTION CABINET ASSEMBLY SPEAKER, FULLRANGE CHASSIS ASSEMBLY KEYBOARD WINDOW CPT ASSEMBLY (CRT) BACK COVER ASSEMBLY CHASSIS ASSEMBLY MAIN H27H38DT 3091V00B66A 120-C77G 3141VSNJ06D 3790V00711A 6335V29032A 3809V00332A 3141VMNU33F 5 6 7 8 SCALE 9 10 6 1.000 5 4 3 2 7 SCALE 3828VD0171F 1.
H32H38DT Exploded View 1 2 REF 1 2 3 4 5 6 7 3 4 DESCRIPTION CABINET ASSEMBLY SPEAKER, FULLRANGE CHASSIS ASSEMBLY KEYBOARD WINDOW CPT ASSEMBLY (CRT) BACK COVER ASSEMBLY CHASSIS ASSEMBLY MAIN H32H38DT 3091V00B56A 120-C77G 3141VSNJ06E 3790V00711A 6335V32012C 3809V00B09A 3141VMNU33G 5 6 7 8 SCALE 9 10 6 1.000 5 4 3 2 7 SCALE 3828VD0171F 1.
Microprocessor 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-1 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
Audio 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-2 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
Power Supply 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-3 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
Deflection 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-4 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
Tilt 1 2 3 4 5 6 7 8 9 10 G F E D C B OPTIONAL A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-5 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
MPI Card 1 2 3 4 5 6 7 8 9 10 G F + 12 C ON11E1 VSB 6 6 3 0 VL0 2 811 11 1 2 + 12 VSB + 5V SB F + 5 VSB F TP1 2 2 R4 9 9 5 10 K 1 R4 9 9 6 3 MPI_ DATA_ IN 3 1 2 470 4 MPI_ DATA_ OUT 3 C R4 9 93 4 B 1 2 E 5 6 7 8 Q4 9 0 6 0 TR9 45 0 0 9 AA KSC 9 4 5 C - Y 5 6 7 2 10 K E 1 2 + 5V SB F 1 R4 9 9 4 2 2K 2 1 C4967 2 2 0 pF 500V + 5V SB F + 5VSB F 8 2 9 + 5 VSB F 9 1 10 IR_ DATA 10 11 C LONESENSE- PTY- SELEC T 11 1 2 C4946 10 0 µ F 16 V R4 9 9 7 10 K R4 9 9
Video Output 1 2 3 4 5 6 7 8 9 10 G W510 0 1 2 9 71- 16 R5117 2 1 2 20 Q510 1 C 0 TR9 45 00 9AA KSC 9 45 C - Y E F 3 C 5114 R5115 B 2 2 1 1 1.5 K 2 150 pF 5 0V 1 + 2 00 V 1 2 R5116 1.
Keyboard 1 2 3 4 5 6 7 8 9 10 G F 43 43 SW7 14 0 - 3 15 A 1 MENU MUTE 43 SW6 140 - 3 15 A 2 1 C LOSED C APTION 43 SW5 14 0 - 315 A 2 1 VOLUME DOWN SW4 140 - 315 A 2 1 43 VOLUME UP 43 SW3 14 0 - 3 15 A 2 1 C HANNEL DOWN SW2 14 0 - 3 15A 2 1 C HANNEL UP 2 E R4 1 R3 2 1 10 0 R2 2 1 330 R1 2 1 39 0 R10 2 4 30 1 2 430 POWER + 5V SB D SHT 10 CN6K2 3 87 - A0 5 E POWER 11 1 2 R5 1 2 220 2 KEY 3 3 TO MAIN PC B IR 4 4 5 5 C IR KEY SHT 10 SHT
Ir Led Switch 1 2 3 4 5 6 7 8 9 10 G F POWER + 5V SB E LED1 4 9 3 0 V0 0 0 4 8 A 1 43 SW8 14 0 - 3 15A L1 10 µ H R6 2 2 1 2 IR1 1 330 1 1 2 2 IR LED INDIC ATOR LED C1 100 µ F 10V 6 72 6 VV0 0 0 6 H GND VC C 3 OUT 2 1 1 3 R7 1 D 2 B 2 4 .
Front Jack 1 2 3 4 5 6 7 8 9 10 G JP2 6 6 13 V0 0 0 10 B S- VIDEO IN AUDIO LEFT IN VIDEO IN F Y 18 R17 75 E R19 47 ZD1 0DZ910009AJ 9 .1V 1/ 2 W MTZJ9 .1B 1 C 2 4 3 5 2 2 1 1 2 2 1 1 AUDIO RIGHT IN 6 7 10 R18 75 9 8 11 13 12 14 15 1 + 5V SB ZD2 2 1 1 17 2 R2 1 75 R2 0 47 2 16 + 3 .3 VSB TP2 2 0DZ910009AJ 9 .1V 1/ 2 W MTZJ9 .1B 1 2 R2 3 4 .7 K 1 D1 1 R2 5 4 .7 K D2 2 2 1 2 R2 2 47 D ZD3 0DZ910009AJ 9 .1V 1/ 2 W MTZJ9 .
PCB Layout Top 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-11 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
MPI C4966 C4967 1 C4965 Q4 9 0 4 C E R4 9 8 7 R4 9 8 6 R4 9 8 9 R4 9 8 4 R4 9 8 2 R4 9 9 2 B C R4 9 9 3 B DIREC TION PROC ESS REV " E" R4 9 9 0 Q4 9 0 5 E R4 9 9 5 R4 9 9 6 R4 9 9 1 Q4 9 0 6 C N3C OM4 W16 4 C NSVM C ON2 C 5 10 3 R5 10 6 C 5 10 5 W5 10 0 C C E W5 10 1 1 1 1 W3 W2 C N1VGA10 R5 10 7 C RT C 5 10 0 C 5 10 2 C 5 10 7 W5 10 2 C RT2 B C 5 10 1 SG5 10 2 R5 113 1 R5 10 4 1 1 IC 5101 REV " E" 6 8 7 0 VS2 2 3 9 E C N1E4 C 5 110 D5 10 0 R5 111 R5 112 S
One Panel 2nd Version 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-13 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
DTV-S 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-14 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
D2A POWER BOARD 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-15 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
TUNER INTERFACE 1 2 3 4 5 6 7 8 9 10 G F E D C B A 3828VD0171F CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE LETTER “X” IN THEIR COMPONENTS DESIGNATORS. REPLACE ONLY WITH PART NUMBERS SPECIFIED. 6-16 ALL COMPONENTS WITH “M” IN THE DESIGNATOR ARE A SURFACE MOUNTED COMPONENT.
