Page 1
DBTV1901 SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR’S VERSION A Design and specifications are subject to change without notice.
Page 2
DBTV1901 SERVICE MANUAL COLOR TELEVISION RECEIVER REVISION 1 MFR’S VERSION C PCB010 PCB110 MFR’S VERSION TMX494A TCX352A TMX494B TCX352B Please file this revision with the original version.
Page 3
Change of PCB ELECTRICAL REPLACEMENT PARTS LIST MFR'S VERSION A MFR'S VERSION C REF. NO. PART NO. DESCRIPTION PART NO. DESCRIPTION R416 R002T2010J RC OHM 1/2W C422 P613T1154J CMPL 0.15 UF 100V TF MAIN PCB ASS'Y (VERSION A) MAIN PCB ASS'Y (VERSION C) PCB010 A3J907A01A A3J907A010 TMX494A...
Page 6
MICON/TUNER SCHEMATIC DIAGRAM (MAIN PCB) ACCESSORY TU001 ENV56DB6G3 W835 R128 TM101 R607 C003 RC-DW010 R101 R126 2.7K FROM/TO CHROMA OS101 PIC-37143SY TUNER+5V FROM DEFLECTION/CRT R002 R001 18K 1/2W 18K 1/2W X-RAY R143 FROM POWER DEGAUSS MICON IC TO SOUND/AV IC101 OEC7073A AUDIO_MUTE AUDIO MUTE...
Page 7
CHROMA SCHEMATIC DIAGRAM (MAIN PCB) FROM POWER UNREG+12V Q603 W818 KTC3203_Y R623 120 1/4W Q605 FROM SOUND/AV Q604 KTC3203_Y KTC3203_Y Q606 VIDEO_IN KTC3203_Y 11.3 CF603 SFSRA4M50CF00-A0 R642 D605 11E1-EIC 3.18 8.63 7.96 2.55 08.7 1.70 5.65 C634 2.21 4.92 Y SW OUT FROM/TO SOUND/AV QIF OUT 100P CH...
Page 8
POWER SCHEMATIC DIAGRAM (MAIN PCB) 4A 125V TO MICON/TUNER CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, DEGAUSS REPLACE ONLY WITH THE SAME TYPE 4A 125V (F501) FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TO SOUND/AV TYPE 4A 125V (F501).
Page 10
SOUND/AV SCHEMATIC DIAGRAM (MAIN PCB) J703 (FRONT) AV1-09D-4 TO CHROMA R703 AUDIO 2 AUDIO_IN A_IN R704 V_IN VIDEO 2 VIDEO_IN J702 AV1-09D-3 W807 FROM TV POWER SOUND_GND SOUND+B SPEAKER CD101A CH012002 FROM MICON/TUNER SP1001 S08F21 CD101B 8 OHM R1001 CH012003 AUDIO_MUTE C1002_1 R1003...
Page 11
WAVEFORMS MICON/TUNER 11 1V 20µs/div 200mV 5ms/div 0.5V 20µs/div 12 1V 20µs/div 0.5V 20µs/div 200mV 20µs/div 1V 20µs/div 3 200mV 20µs/div 20V 20µs/div DEFLECTION/CRT 200mV 5ms/div 14 0.5V 5ms/div 9 200mV 20µs/div CHROMA 15 20V 20µs/div 0.5V 5ms/div 0.5V 2ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
Page 12
WAVEFORMS 16 2V 20µs/div 21 50V 20µs/div 26 500mV 20us/div 22 50V 20µs/div 200V 20µs/div SOUND/AV 10V 5ms/div 0.5V 1ms/div 10V 5ms/div 1V 1ms/div 50V 20µs/div 25 500mV 1ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
Page 18
DBTV1901 Series B SERVICE MANUAL COLOR TELEVISION RECEIVER ORIGINAL MFR'S VERSION B Design and specifications are subject to change without notice.
SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.
CONTENTS SERVICING NOTICES ON CHECKING ......................A1-1 HOW TO ORDER PARTS ..........................A1-1 IMPORTANT ..............................A1-1 CONTENTS ..............................A2-1 GENERAL SPECIFICATIONS ........................A3-1~A3-4 DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP ......................B1-1 2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ............... B2-1, B2-2 SERVICE MODE LIST ............................
GENERAL SPECIFICATIONS CRT Size / Visual Size 19 inch / 480.0mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 1Speaker Position Bottom Size 3 Inch Impedance Sound Output 1.5 W 10%(Typical) 1.0 W NTSC3.58+4.43 /PAL60Hz Tuning Broadcasting System System M...
Page 22
GENERAL SPECIFICATIONS Contrast Color Tint (NTSC Only) Sharpness Tuning Bass Treble Balance Back Light Stereo,Audio Output,SAP Video Color Stream Channel(TV/Cable) CH Label Sleep Timer Sound Mute V-chip Rating OSD Language English French Spanish OSD Language Setting English Clock and Sleep Timer Max Time 120 Min Timer...
Page 23
GENERAL SPECIFICATIONS TV/VCR(VCR) Code Play Stop Cable G-11 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type USA,ORION Type Auto Search CH Allocation Channel Lock Just Clock Function Game Position CH Label VM Circuit Full OSD Premiere Comb Filter...
Page 24
GENERAL SPECIFICATIONS PTB Sheet 300 ohm to 75 ohm Antenna Adapter G-13 Interface Switch Front Power System Select Main Power SW Sub Power Channel Up/Reset Channel Down/Enter Volume Up/Set Up Volume Down/Set Down MENU=Volume Up+Volume Down Rear AC/DC TV/CATV Selector Degauss Main Power SW Indicator...
DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.
DISASSEMBLY INSTRUCTIONS REMOVAL AND INSTALLATION OF When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.) REMOVAL NOTE Put the Masking Tape (cotton tape) around the Flat...
Page 27
DISASSEMBLY INSTRUCTIONS INSTALLATION When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.
SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 1 second. Set Key Remocon Key Operations Releasing of V-CHIP PASSWORD.
ELECTRICAL ADJUSTMENTS BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: RF AGC DELAY Read and perform these adjustments when repairing the Place the set with Aging Test for more than 15 minutes. circuits or replacing electrical parts or PCB assemblies. Receive an 63dB monoscope pattern.
Page 30
ELECTRICAL ADJUSTMENTS 2-8: OSD HORIZONTAL Activate the adjustment mode display of Fig. 1-1. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-3) "A" Fig. 2-1 00 OSD Fig.
Page 31
ELECTRICAL ADJUSTMENTS 2-13: Confirmation of Fixed Value (step No.) Please check if the fixed values of the each adjustment items are set correctly referring below. FUNCTION H VCO BRIGHT MAX BRIGHT MIN CONT CENT CONT MIN COLOR MAX COLOR MIN SHARPNESS FM LEVEL LEVEL...
Page 32
ELECTRICAL ADJUSTMENTS 3-3: STATIC CONVERGENCE PURITY AND CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator. minutes before performing the following adjustments.
Page 33
ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CP601 FB401 CP806_1 TP023 TU001 TP022 J801 CP401 CRT PCB T502 L503 CP502 S501B S501A CD101A CD101B MAIN PCB AC IN SPEAKER...
BLOCK DIAGRAM TU001 CHROMA IC CH. UP IC601 M61250FP X602 IC1001 AN7511 3.579545MHz VOL. UP X' TAL AUDIO OUT MICON IC SOUND AMP SP1001 CH. DOWN RF AGC OUT CF601 IC101 OEC7073A SAW FILTER VIF IN (1) VOL. DOWN Q606 AUDIO MUTE VIF IN (2) REG.
Page 37
MICON/TUNER SCHEMATIC DIAGRAM ACCESSORY (MAIN PCB) TU001 ENV56D66G3 TM101 RC-DW010 C003 FROM/TO CHROMA OS101 PIC-28143SY-2 W837 TUNER+5V R002 R001 18K 1/2W 18K 1/2W I2C_OFF MICON IC IC101 OEC7045B C137 R123 OSD_R P50/H.SYNC RED R 4.7K C129 R122 P51/V.SYNC GREEN G OSD_G 4.7K C125...
Page 38
CHROMA SCHEMATIC DIAGRAM (MAIN PCB) FROM TV POWER UNREG+12V Q605 Q604 KTC3203_Y-AT KTC3203_Y-AT Q606 KTC3203_Y-AT 11.3 R639 CF604 EFCT4R5MW5 Q603 KTC3203_Y-AT FROM SOUND/AV C647 R615 CF603 VIDEO_IN EFCT4R5YS5A R638 R646 C638_1 R634 FROM/TO SOUND/AV R611 R642 D605 W806 AUDIO_OUT AUDIO OUT ACL/ABCL 11E1-EIC C604...
Page 39
TV POWER SCHEMATIC DIAGRAM (MAIN PCB) 4A 125V CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE 4A 125V (F501) FUSE. ATTENTION: POUR UNE PROTECTION CONTINUE LES RISQUES TO SOUND/AV D’INCEIE N’UTILISER QUE DES FUSIBLE DE MEME TYPE 4A 125V (F501).
WAVEFORMS 16 2V 20µs/div 21 50V 20µs/div 26 500mV 20us/div 22 50V 20µs/div 200V 20µs/div SOUND/AV 0.5V 1ms/div 10V 5ms/div 10V 5ms/div 1V 1ms/div 50V 20µs/div 25 500mV 1ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
Page 49
SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.
CONTENTS SERVICING NOTICES ON CHECKING ..................... A1-1 HOW TO ORDER PARTS ........................... A1-1 IMPORTANT ..............................A1-1 CONTENTS ..............................A2-1 GENERAL SPECIFICATIONS ........................A3-1~A3-4 DISASSEMBLY INSTRUCTIONS ....................... SERVICE MODE LIST ..........................CONFIRMATION OF USING HOURS ......................NOTE FOR THE REPLACING OF MEMORY IC ..................ELECTRICAL ADJUSTMENTS ........................
GENERAL SPECIFICATIONS G - 1 CRT Size / Visual Size 19 inch / 480.0mmV System CRT Type Normal Deflection degree Magnetic Field BV/BH +0.45G/0.18G Color System NTSC Speaker 1Speaker Position Bottom Size 3 Inch Impedance Sound Output 1.5 W 10%(Typical) 1.0 W NTSC3.58+4.43 /PAL60Hz G - 2...
Page 52
GENERAL SPECIFICATIONS G - 8 OSD Language English French Spanish OSD Language Setting English G - 9 Clock and Sleep Timer Max Time 120 Min Timer Step On/Off Timer Program(On Tim / Off Tim) Wake Up Timer Timer Back-up (at Power Off Mode) more than G - 1 0 Remote...
Page 53
GENERAL SPECIFICATIONS G - 1 1 Features Auto Degauss Auto Shut Off Canal+ CATV Anti-theft Rental Memory(Last CH) Memory(Last Volume) V-Chip Type USA,ORION Type Auto Search CH Allocation Channel Lock Just Clock Function Game Position CH Label VM Circuit Full OSD Premiere Comb Filter Lines...
Page 54
GENERAL SPECIFICATIONS G - 1 3 Interface Switch Front Power System Select Main Power SW Sub Power Channel Up/Reset Channel Down/Enter Volume Up/Set Up Volume Down/Set Down MENU=Volume Up+Volume Down Rear AC/DC TV/CATV Selector Degauss Main Power SW Indicator Power Stand-by On Timer Terminals...
DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 1. REMOVAL OF ANODE CAP remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.
SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 1 second. Remocon Key Operations Set Key Releasing of V-CHIP PASSWORD.
ELECTRICAL ADJUSTMENTS BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS 2-1: RF AGC DELAY Read and perform these adjustments when repairing the Place the set with Aging Test for more than 15 minutes. circuits or replacing electrical parts or PCB assemblies. Receive an 80dB monoscope pattern.
Page 58
ELECTRICAL ADJUSTMENTS 2-9: OSD HORIZONTAL Activate the adjustment mode display of Fig. 1-1. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-3) Fig. 2-1 00 OSD Fig. 2-3 2-10: VIF VCO 120% Place the set with Aging Test for more than 10 minutes.
Page 59
ELECTRICAL ADJUSTMENTS PURITY AND CONVERGENCE 3-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 3-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator. minutes before performing the following adjustments.
BLOCK DIAGRAM TU001 CHROMA IC CH UP IC601 M61206FP X602 3.579545MHz IC351 AN7511 VOL UP X' TAL AUDIO OUT Q607 MICON IC SOUND AMP SP351 CH DOWN RF AGC OUT IC101 OEC7045B CF601 POWER ON CONT SAW FILTER VIF IN (1) VOL DOWN Q606 P02/AUDIO MUTE...
Need help?
Do you have a question about the DBTV1901 and is the answer not in the manual?
Questions and answers