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HT-3768

COLOUR TELEVISION

Service Manual

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2. ...............................

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5.  Disassembly instructions...........................
6.  Specific information..................................
7.  Electrical adjustment..................................

8. Information of Resistors and capacitors.....
9. Damageable parts list................................

10.

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Brief operation instructions

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Technical specifications &

Safety precautions

Servicing precautions

Functions & Location of controls

Appendix

2
3

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10

11
13
30

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34

Features

37cm super flat picture tube
Auto search 218 programs presetting and memory

Child Lock & On Screen Help Function

Haier group

Summary of Contents for HT-3768

Page 1: ...Resistors and capacitors 9 Damageable parts list 10 Brief operation instructions Technical specifications Safety precautions Servicing precautions Functions Location of controls Appendix 2 3 8 10 11 13 30 32 34 35 Features 37cm super flat picture tube Auto search 218 programs presetting and memory Child Lock On Screen Help Function Haier group ...

Page 2: ...tes 12 B Precautions for handling of picture tube 12 C Exploded of cabinet parts 12 6 Specific information 15 A Principle integrated circuits 15 B Service mode and adjusting items and data 20 C Error detection process 22 7 Electrical adjustment 25 8 Information of Resistors and capacitors 27 9 Damageable parts list Replacement parts list 28 10 Appendix 30 Circuit block diagram Circuit diagrams 2 ...

Page 3: ...eplaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of the manufacturer General Guidance An Isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line Use a transformer of adequate power rating as this protects t...

Page 4: ...ADIATION in this TV receiver is the High Voltage Section and the Picture Tube For continued X RAY RADIATION protection the replacement tube must be of the same type as specified in the Replacement Parts List Before returning the receiver to the customer Always perform an AC leakage current check on the exposed metallic parts of the cabinet such as antennas terminals etc to make sure that the set i...

Page 5: ...be used for long time or it is in thunder and lightening please pull out the plug fromAC outlet and the antenna plug from the cover ofthe TVset Explanation on the display tube Generally it is not needed to clean the tube surface However if necessary its surface can be cleaned with a dry cotton cloth after cutting off the power Don t use any cleanser If using hard cloth the tube surface will be dam...

Page 6: ...the insulated clip lead to the picture tube anode button using an insulating handle to avoid personal contact with high voltage 4 Do not spray chemicals on or near this receiver or any of its assemblies 5 Unless specified otherwise in this service manual clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner cotton tipped stick or comparable nonabrasiv...

Page 7: ...devices not classified as anti static can generate electrical charges sufficient to damage ES devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ES devices 6 Do not remove a replacement ES device from its protective package until immediately before you are ready to install it Most replacement ES devices are packaged with leads electrically sho...

Page 8: ...ound both the component lead and the foil CAUTION Work quickly to avoid overheating the circuit board printed foil d Closely inspect the solder area and remove any excess or splashed solder with a small wire bristle brush Remove Replacement Some chassis circuit boards have slotted holes oblong through which the IC leads are inserted and then bent flat against the circuit foil When holes are of slo...

Page 9: ...s possible to diode body Bend the two remaining leads perpendicularly to the circuit board Observing diode polarity wrap each lead of the new diode round the corresponding lead on the circuit board Securely crimp each connection and solder it Inspect on the circuit board copper side the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional sold...

Page 10: ...ped area and clip off any excess jumper wire At other connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on the component side of the circuit board 1 Remove the defective copper pattern with a sharp knife Remove at least 1 4 inch of copper to insure that a hazardous condition wil...

Page 11: ...selection Screen saver when no signal 218 programs Preset Slide curtain power on off display improved eye protection Location of controls Front panel of the TV set Haier He so adphone cket VIDEO R L AUDIO R AUDIO L VIDEO MENU TV AV Volume up down Program up down P Rear panel of the TV set 11 ...

Page 12: ...V AV conversion One digit two digit three digit select Menu item select Menu item adjust Sleep timer Picture mode Call of Menu red start game Volume up 1 2 3 4 5 6 7 8 9 0 SYSTEM DISPLAY PICTURE MENU CH CH CALENDAR TV AV SELC PICTURE HTR 020 IV BRIEF OPERATION INSTRUCTIONS Insert the power plug into the power line socket and insert the antenna plug into the antenna socket on the rear panel Press d...

Page 13: ...number that you do not want to see Then Then select SKIP and select SKIP to ON Now the program number is deleted Repeat the above steps and select SKIP to OFF the deleted program number can be resumed B Volume tuning Press VOLUME buttons to increase and to decrease the volume C Personal preference settings Picture modes Press SELC PICTURE repeatedly to change among MEMORY 1 MEMORY2 MEMORY3 to chan...

Page 14: ...damage EXPLODED VIEW OF CABINET PARTS Model HT 3768 PAL BG HT 3768 Exploded View 1 5 3 4 14 6 THE NAME OF MAIN PARTS 1 FRONT ASSEMBLE 2 CRT 3 LEFT SPEAKER 4 RIGHT SPEAKER 5 BASE BOARD 6 BACK COVER 5 2 Exploded view parts list Model HT 3768 NO Name of part Part specialized code QTY 1 Power button 0090201538 1 2 Front frame 0090202354 3 Jiggle button 0090201537 1 4 Light conductive pole 0090201536 1...

Page 15: ...cuits N203 TC24C08 A2 Main integrated circuits 1 TMPA8803CSN Microprocessor Picture IF sound IF video processing H and V Scan color decoding 2 TDA2611 Vertical output integrated circuits 3 LA7840 Sound power amplifying integrated circuits A3 Electrical circuit analysis 1 Microprocessor and Small signal processing super monolithic integrated circuits TMPA8803CSN TMPA8803CSN is super large integrate...

Page 16: ... Y SIGNAL INPUT 2 4 750 5000 21 Cr SIGNAL INPUT 2 4 700 4500 22 TV GND 0 0 0 23 COLOR SIGNAL INPUT 0 0 0 24 EXTERIOR VEDIO SIGNAL INPUT2 2 4 700 4500 25 TV VCC 3 4 320 300 26 VEDIO SIGNAL INPUT 2 6 750 5000 27 AUTOMATIC BRIGHT CONTROL 4 5 750 5000 28 AUDIO OUTPUT 3 5 750 1400 29 9 VCC 8 8 100 100 30 IF SIGNAL OUTPUT 3 6 700 950 31 SIF SIGNAL OUTPUT 1 8 700 2100 32 EXTERIOR SIGNAL INPUT 4 3 750 140...

Page 17: ...nal will be released at the IF terminal of Z101 to b of the transistor V101 where signals are amplified to compensate for the insertion losses of the sound surface wave filter Single or dual ended input is used for the sound surface wave filters Z101 of this appliance according to system properties Intermediate frequency signals will be transmitted to 41 and 42 of N204 TMP8803SN The mixed signals ...

Page 18: ...stor R443 5 6KΩ of N204 16 provides a reference current to the vertical tooth wave generator The external capacitor C244 0 1uF of pin 2 forms the vertical ramp wave The vertical ramp wave is sending the pin 4 of the vertical scan output integrated circuit N402 that is a complete bridge current drive output circuit After shaped and amplified the vertical ramp wave is output from pin 2 of N402 Infor...

Page 19: ...source The circuits are comprised of switching transistor V513 switching mode transformer T501 bridge rectifier components When the switch is set to on the pulse voltage of the 220V voltage rectified by VD501 rectifier is filtered by the capacitor C507 150uF to obtain 300V direct current which is added through 3 4 of the switching mode transformer T501 to the collective polar of switching transist...

Page 20: ...eat the first step you will enter the D mode Now one D is displayed on the TV screen Press PRO and PRO buttons to select items for adjustment Press VOL and VOL buttons to adjust selected items Press the POWER button to switch off the appliance and go back to the normal state Maintenance menu Table 8 Item Specifications Default Value Variable Mark RCUT RED CUT OFF BALANCE 20 GCUT GREEN CUT OFF BALA...

Page 21: ... PINCUSHION CORRECTION 00 DPCS 50 60Hz PINCUSHION CORRECTION 00 KEY 50Hz TRAPEZIUM CORRECTION 00 KEYS 50 60Hz TRAPEZIUM CORRECTION 00 WID 50Hz HORIZONTAL WIDTH 00 WIDS 50 60Hz HORIZONTAL WIDTH 00 VCP VERTICAL COMPENSATION 00 CNR CONNER CORRECTION 00 HCP HORIZONTAL COMPENSATION 00 SBY SECAM B Y 08 SRY SECAM R Y 08 RAGC RADIO FREQUENCY AGC 23 AFT AUTO FREQUENCY TRACE 15 HAFC HORIZONTAL AUTO FREQUENC...

Page 22: ...be Check to see if rectifying tube is normal Checkswitch powerunit T esttoseeallterminal Resistanceofload Isnormal Checktosee110V 180V etc voltageisnormal Abnormal Normal Normal Normal The failure of horizontal unit or N204 Check the control voltage of V522 or CPU power Check to see if 9v 5v is normal Check N902 N905 Checktoseeifthe collectorvoltageofV522 is24V CheckD501 C507 V503 etc Abnormal No ...

Page 23: ...1 Abnormal Abnormal Normal Normal Test flament voltage Test the base voltage of V444 Check the voltage of V432 collector is normal Video amplifying board is abnormal InspectT401 R437 etc Inspect the circuit from pin50 52 51 of N204 to video amplifying Lower Higher T402 V432 or 5 1are brok V411 is not well welded or open Abnormal Normal Check to see if 9V voltage is normal at No 17 of N204 Change w...

Page 24: ...pheral components of N204 Inspect 24V power supply Check to see if the deflection yorks are connected C433 is open or weldless Inspect peripheral component of N402 and N402 itself 4 None No Yes Inspect the circuit from CPU to tuner Antenna or tuner is abnormal No Yes Inspect V101 Z101 N204and PIF part Enter D MODE or enter S MODE with customer remote controller Make RAGC tuned to 2Dor so Noise on ...

Page 25: ...llector open Touch No 7of V701 with black probe to see if noise exists Picture exists but no sound Make C703 open Multimeter is at band R 1K Red probe connect to ground Touch No 6 of N701 with black probe 7 Yes No Inspect the circuit from No 50of N204 to No 3 of XZ603 Inspect R617 Yes No Check to see if V611 is open or not well welded Lack of red Check to see if voltages of XS602 are normal Change...

Page 26: ... 2 Screen voltage adjustment 1 Switch on the power and receive PAL system circular signal Warm up the TV set for 15 min 2 Enter the adjustment D state Press the button then a bright horizontal line appears Adjust screen potentiometer to let the horizontal line just appears 3 Focus adjustment 1 Receive electronic circular signal 2 Set picture mode on standard mode 3 Adjust focus potentiometer until...

Page 27: ...tem of Capacitor Example CL42 17 50V 2F4 104 Z Type Voltage Value pF Tolerance CL21X 100V 223 J Type Voltage Value pF Tolerance CL110X 25V 100 F 20 Type Voltage Value Tolerance 104 10 104 223 22 103 Numbering system of resistor Example RY17S 2W 390 J 05 E A Type Wattage Value Tolerance RS11 1 2W 1 8K K Type Wattage Value Tolerance ABBREVIATION OF PART NAME AND DESCRIPTION RESISTOR CAPACITOR PART N...

Page 28: ...094400663 FU501 FUSE T2 5A 250V 0094000150 C507 al electrolytic capacitor 400 USR 150uF M 0094201434 N902 IC KSA24C04 0094400542 N402 IC TA8403K 0094400352 SW501 SWITCH KDC A06 0094000370 A901 RECEIVE HS0038A2 0094000136 U101 TUNER TDC 3G2 9V 0094000151 V432 H transistor 2SD1651 0094400465 E C B B CE KSC2331 YTA B CE KSR1010TA KSR2010TA BC548 CTA EBC CBE KSC815 YTA KSA539 YTA E C B 2SD18887YD 28 ...

Page 29: ...34 D10B681J T 1 6W 680 1 R234 35 D10B681J T 1 6W 680 1 R235 36 D10B681J T 1 6W 680 1 R236 37 D10B102J T 1 6W 1K 1 R237 38 D10B102J T 1 6W 1K 1 R238 39 D10B102J T 1 6W 1K 1 R239 40 D10B102J T 1 6W 1K 1 R240 41 D10B102J T 1 6W 1K 1 R241 42 D10B102J T 1 6W 1K 1 R242 43 D10B102J T 1 6W 1K 1 R243 44 D10B102J T 1 6W 1K 1 R244 45 D10B122J T 1 6W 1 2K 1 R245 46 D10B152J T 1 6W 1 5K 1 R246 47 D10B152J T 1 ...

Page 30: ...116 D10B104J T 1 6W 100K 1 R316 117 D10B104J T 1 6W 100K 1 R317 118 D10B124J T 1 6W 120K 1 R318 119 D10B224J T 1 6W 220K 1 R319 120 D10B334J T 1 6W 330K 1 R320 121 D10B564J T 1 6W 560K 1 R321 122 D10C2R2J T 1 4W 2 2 1 R322 123 D10C330J T 1 4W 33 1 R323 124 D10C471J T 1 4W 470 1 R324 125 D10C182J T 1 4W 1 8K 1 R325 126 D10C272J T 1 4W 2 7K 1 R326 127 D10C392J T 1 4W 3 9K 1 R327 128 D10C472J T 1 4W ...

Page 31: ...T 50V 0 01u 1 C120 195 C2FF103Z T 50V 0 01u 1 C114 196 C2FF103Z T 50V 0 01u 1 C113 197 C2FF103Z T 50V 0 01u 1 C310 198 C2FF103Z T 50V 0 01u 1 C304 199 C2FF103Z T 50V 0 01u 1 C309 200 C2FF103Z T 50V 0 01u 1 C233 201 C2FF103Z T 50V 0 01u 1 C232 202 C2FF103Z T 50V 0 01u 1 C225 203 C2FF103Z T 50V 0 01u 1 C929 204 C2FF103Z T 50V 0 01u 1 C924 205 C2FF103Z T 50V 0 01u 1 C915 206 C2FF103Z T 50V 0 01u 1 C9...

Page 32: ...0M 50V 1u 1 C245 273 E20F1R0M 50V 1u 1 C236 274 E20F1R0M 50V 1u 1 C217 275 E20F1R0M 50V 1u 1 C216 276 E20F2R2M 50V 2 2u 1 C103 277 E20F2R2M 50V 2 2u 1 C926 278 E20F2R2M 50V 2 2u 1 C703 279 E20F2R2M 50V 2 2u 1 C443 280 E20F2R2M 50V 2 2u 1 C300 281 E20F4R7M 50V 4 7u 1 C101 282 E20F4R7M 50V 4 7u 1 C705 283 E20F4R7M 50V 4 7u 1 C206 284 E21H1R0M 160V 1U 1 C411 285 E20H100M H 160V 10u high temperature m...

Page 33: ...3 DR0031XX T TJ1010 1 VD555 354 large module 4DZ certain voltage diode 1 355 DZ0001XX T RD6 2EB3 HZ7A1 1 VD551 356 DZ0002XX T RD5 1EB2 HZ5C1 1 VD922 357 DZ0004XX T RD10EB2 HZ11C1 1 VD436 358 DZ0006XX T RD3 6L HZ4A2 1 VD501 359 DZ0006XX T RD3 6L HZ4A2 1 VD902 360 DZ0010XX T RD8 2EB3 HZ9A2 1 VD519 361 DZ0011XX T RD9 1EB2 HZ9B2 1 VD202 362 DZ0011XX T RD9 1EB2 HZ9B2 1 VD203 363 DZ0011XX T RD9 1EB2 HZ9...

Page 34: ... 428 NXXX005S threee AV socket 1 429 NXXX0070 AC SOCKET 2S large module 1 XZ501 430 NXXX0210 SPEAKER SOCKET little module two core 1 XZ701 431 NXXX0210 SPEAKER SOCKET little module two core 1 XZ901 432 NXXX0230 2S SOCKET middle module KEa 1 XZ500 433 NXXX0242 3S minitype moudle 1 XZ213 434 NXXX0242 3S minitype moudle 1 XZ218 435 NXXX0250 DY SOCKET middle module DYa 1 XZ411 436 sta transformer 1 43...

Page 35: ...D1 6 3 0rivet 1 P46 493 PNXX0020 D1 6 3 0rivet 1 P47 494 PNXX0020 D1 6 3 0rivet 1 P48 495 PNXX0020 D1 6 3 0rivet 1 P5 496 PNXX0020 D1 6 3 0rivet 1 P6 497 PNXX0020 D1 6 3 0rivet 1 P7 498 PNXX0020 D1 6 3 0rivet 1 P8 499 PNXX0020 D1 6 3 0rivet 1 P9 500 PNXX0020 D1 6 3 0rivet 1 P56 501 PNXX0020 D1 6 3 0rivet 1 P57 502 PNXX0020 D1 6 3 0rivet 1 P58 503 PNXX0020 D1 6 3 0rivet 1 P59 504 PNXX0020 D1 6 3 0r...

Page 36: ......

Page 37: ...B Circuit Diagrams 1 ...

Page 38: ...Sincere Forever Haier Group Tel 86 532 8938356 Web site http www haier com ...

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