Haier HT-3768 Service Manual
  1. Manuals
  2. Brands
  3. Haier Manuals
  4. TV
  5. HT-3768
  6. Service manual

Haier HT-3768 Service Manual

Colour television
Hide thumbs Also See for HT-3768:
Table of Contents

Advertisement

Quick Links

See also: Owner's Manual
COLOUR TELEVISION

Service Manual

1.
2.
3.
4.
5. Disassembly instructions...........................
6. Specific information..................................
7. Electrical adjustment..................................
8. Information of Resistors and capacitors.....
9. Damageable parts list................................
10.
Features
37cm super flat picture tube
Auto search 218 programs presetting and memory
Child Lock & On Screen Help Function
Haier group
HT-3768
Technical specifications &
Safety precautions
Servicing precautions
Functions & Location of controls
Brief operation instructions
Appendix
.............................
- 1 -
.
....................................
...............................
...............
........................
.......... ..........
..
2
3
8
10
11
13
30
32
34
35

Advertisement

Table of Contents
loading

Related Manuals for Haier HT-3768

Summary of Contents for Haier HT-3768

  • Page 1: Service Manual

    HT-3768 COLOUR TELEVISION Service Manual Technical specifications & Safety precautions ........Servicing precautions ....... Functions & Location of controls ....Brief operation instructions ......5. Disassembly instructions......6. Specific information........7. Electrical adjustment........8. Information of Resistors and capacitors..9. Damageable parts list........

  • Page 2: Table Of Contents

    Contents 1 Technical specifications & Safety precautions ………………. 2. Servicing precautions…………………………………………….. Functions & Location of controls …………………………….. Brief operation instructions…………………………………….. 5. Disassembly instructions………………………………………... A. Important notes………………………………………………... B. Precautions for handling of picture tube………………….. C. Exploded of cabinet parts……………………………………. 6. Specific information……………………………………………..A.

  • Page 3: Technical Specifications & Safety Precautions

    I. TECHNICAL SPECIFICATION & SAFETY PRECAUTIONS POWER SUPPLY: AC150-AC 250V, 50 /60Hz Tuning system: voltage synthesized type auto-search fine tuning system IF: 38.9MHz Power consumption: ≤ 70W Antenna input impedance: 75Ω Receiving system: a) Color system: PAL/NTSC3.58MHz/4.43MHz b) Broadcast TV system: B/G Language displayed: English Video input: 1.0V (75Ω)

  • Page 4: Servicing Precautions

    the resistor 10mm away from PCB. Keep wires away from high voltage or high temperature parts. Due to the high vacuum and large surface area of the picture tube, extreme care should be taken in handling the Picture Tube. Do not lift the Picture Tube by its Neck. X-RAY Radiation Warning: The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and...
  • Page 5 1. When you clean the TV set, please pull 4. To prevent the TV set from firing and out the power plug from AC outlet. Don't electric shock, don't clean the cabinet and the screen with make the TV set rain benzene, petrol and other chemicals.
  • Page 6 General Servicing Precautions 1. Always unplug the receiver AC power cord from the AC power source before: a. Removing or reinstalling any component, circuit board module or any other assembly of the receiver. b. Disconnecting or reconnecting any receiver electrical plug or other electrical connection.
  • Page 7 Electrostatic ally Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components are usually called Electrostatic ally Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
  • Page 8 3. Keep the soldering iron tip clean and well tinned. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire bristle (0.5 inch, or 1.25cm) brush with a metal handle. Do not use freon-propelled spay-on cleaners. 5. Use the following unsoldering technique a.
  • Page 9 Remove the defective transistor by clipping its leads as close as possible to the component body. Bend into a “U” shape the end of each of three leads remaining on the circuit board. Bend into a “U” shape the replacement transistor leads. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the “U”...

  • Page 10: Functions & Location Of Controls

    whenever this condition is encountered. At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections). 1.

  • Page 11: Location Of Controls

    Audio/video input t interfaces Multiple picture modes 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 R-AUDIO-L VIDEO adphone R/L AUDIO VIDEO cket MENU TV/AV...

  • Page 12: Brief Operation Instructions

    Video (C input terminal Antenna input deo (Y) input terminal Video (C input terminal Video input terminal Audio (L)input terminal S-VIDEO S-VIDEO Audio (R)input terminal L-AUDIO IN-R VIDEO IN Remote Controller Standby Program number Mute Sleep timer One-digit/two-digit/ -/-- three-digit select Program up Volume up Program down...

  • Page 13: Disassembly Instructions

    Press MENU button on the remote controller then use the “ “ key to call up the “tune program” menu on the screen. Then Press the menu” “ item to select it.Use the “ ” key to select the bar “auto search program” then press the “...

  • Page 14: Exploded View Parts List

    EXPLODED VIEW OF CABINET PARTS Model: HT-3768(PAL/BG) HT-3768 Exploded View THE NAME OF MAIN PARTS 1.FRONT ASSEMBLE 2.CRT 3.LEFT SPEAKER...

  • Page 15: Specific Information

    Rear cover 0090202355 SPECIFIC INFORMATIONS A. Principle integrated circuits A1. HT-3768 color TV set composed of the following sections (1) Small signal processing: super monolithic integrated circuits N204(TMPA8803CSN). and memory N901 (AT24C08). (2) Sound power amplifying: integrated circuits N701 ( TDA2611).
  • Page 16 5000 BAND2 15000 KEY INPUT DIGITAL GND 10000 CPU RESET 1000 CPU CLOCK 15000 CPU ClOCK TEST 4500 +5 VCC SIGNAL GND HORIZONTAL SYNC SIGNAL INPUT HORIZONTAL RETURN PULSE SIGNAL INPUT CHARACTER HORIZONTAL LOCATION 1400 HORIZONTAL AGC VERTICAL SIGNAL PRODUCE 1500 LOCATION VERTICAL RETURN PULSE SIGNAL...
  • Page 17 5000 COLOR DECODE PLL +9V VCC 1100 RED SIGNAL OUTPUT 1100 GREEN SIGNAL OUTPUT 1100 BLUE SIGNAL OUTPUT TV SIMULATE GND 4500 +5V VCC 7500 MUTE 12500 C SERIAL BUS DATA LINE 0 12500 C SERIAL BUS COLOCK LINE 0 12500 10000 TUNE VOLTAGE...
  • Page 18 Table 4 Grounding Resistance Working Function Positive Negative Voltage (V) +16V POWER SUPPLY 0.43 AMPLIFIED AUDIO SIGNAL 0.58 OUTPUT GROUND RIPPLE FILTER 0.66 GROUND AUDIO SIGNAL INPUT 0.76 NEGATIVE FEEDBACK 2.05 0.78 3. Analysis of vertical sync and vertical scan output circuits The field sync signals segregated from compound sync signals are used to activate the vertical frequency segregation system which commences when a set amount of vertical sync pulse signals are tested.
  • Page 19 brightness signals including compound sync signals are transmitted to the internal sync segregation circuits, where horizontal sync and vertical sync pulses are segregated. R321 (10K), R462 (12K) C452 (3900pF) VD436 and T402 are connected to N204 (13) are phase-lock loop filters. Horizontal pumping signals are transmitted from (13) of N204 to horizontal promotion transistor V444 (2SC2383), and then drive the H-DRIVE transformer.

  • Page 20: Service Mode And Adjusting Items And Data

    and filtered via VD515 and C542 to obtain +25V direct current voltage to supply the vertical scan IC. The pulse voltage output from (14) is rectified and filtered via VD513 and C532 to obtain +15V direct current voltage. +12V direct current voltage output from N506 (3), after rectification of the secondary source, +9V and +5v are supplied to the decoder chip.
  • Page 21 TV-3.58 SHARPNESS AV-3.58 SHARPNESS TV-4.43 SHARPNESS AV-4.43 SHARPNESS SHPX SHARPNESS MAX VALUE SHPN SHARPNESS MIN VALUE TXCX OSD CONTRAST MAX VALUE RGCN OSD CONTRAST MIN VALUE VCD DATUM0 VCD DATUM1 HPOS 50Hz HORIZONTAL POSITION VP50 50Hz VERTICAL POSITION 50Hz VERTICAL HEIGHT 50/60Hz HORIZONTAL POSITION VP60 60Hz VERTICAL POSITION...

  • Page 22: Error Detection Process

    SELF COL COLOUR CENTER VALUE CHECK SELF OSD POSITION OPTION You can change the DATA with “*” mark when necessary. C. Error Detection Process No light and sound Check to see if Fuse3 is normal Abnormal Normal Check to see 110V 180V Check D501, C507, etc.
  • Page 23 No raster Whether G2 voltage is normal Abnormal Normal Test flament voltage Test the base voltage of V444 Normal Abnormal Normal Abnormal Check to see if b.e Heater Resistor Check the voltage Check the circuit open voltage of V411 is of all pins of XS603 from pin13 of N201 existed?
  • Page 24 Horizontal bright line Make R328 open. Multimeter is at range R 1K. Red probe connects to ground. Touch No.5 of N402 with black probe. Bright line flashes for a moment Check to see if voltage of No.3 at Check to see if R907 and N402 is normal R448 are not well welded or R448 become abnormal...
  • Page 25 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 Make V701 collector open. Touch Power amplifier is normal. No.7of V701 with black probe to Inspect N204and peripheral see if noise exists components of N204...

  • Page 26: Electrical Adjustment

    VII. ELECTRICAL ADJUSTMENT A. Safety precautions 1. It is safe to adjust after using insulating transformer between the power supply and chassis input to prevent the risk of electric shock and protect the instrument. 2. Never disconnect leads while the TV receiver is on. 3.

  • Page 27: Information Of Resistors And Capacitors

    horizontal size is 90-92%. 8. Adjustment of character positions Adjust OSD for the horizontal positions of the screen menu. VIII. INFORMATION RESISTORS CAPACITORS RESISTORS & CAPACITORS-PARTS NO.CODE Notes: 1.part numbers are indicated on most mechanical parts. Please use this part number for parts orders. 2.The unit of resistance is (ohm).K=1000 ,M=1000K 3.The unit of capacitance is...

  • Page 28: Damageable Parts List Replacement Parts List

    Terminal view of transistors KSC815-YTA KSR1010TA KSA539-YTA KSR2010TA 2SD18887YD BC548-CTA KSC2331-YTA DAMAGEABLE PARTS LIST REPLACEMENT PARTS LIST Location Part Name Specification Stock Number Code XS601 GZS8-6-5 0094300098 SOCKET SWITCH V613 2SC4584 0094400663 transistor FU501 FUSE T2.5A-250V 0094000150 al electrolytic C507 400-USR-150uF-M 0094201434 capacitor...
  • Page 29 126 element list compact code:000854 serial number parts code module amount PCB place code large module 1RC carbon film resistance 1 D10B4R7J-T 1/6W 4.7 1 R444 1 R701 2 D10B4R7J-T 3 D10B330J-T 1/6W 33 1 R113 4 D10B101J-T 1/6W 100...

  • Page 30: Appendix

    77 D10B103J-T 1/6W 10K 1 R277 78 D10B103J-T 1/6W 10K 1 R278 79 D10B103J-T 1/6W 10K 1 R279 80 D10B103J-T 1/6W 10K 1 R280 81 D10B103J-T 1/6W 10K 1 R281 82 D10B103J-T 1/6W 10K 1 R282 83 D10B103J-T 1/6W 10K 1 R283 84 D10B103J-T 1/6W 10K...
  • Page 31 159 S10F123J-C 2W 12K 1 R553 160 S10F183J-C 2W 18K 1 R606 161 S10F183J-C 2W 18K 1 R626 1 R616 162 S10F183J-C 2W 18K 163 S10F223J-C 2W 22K 1 R565 resistance 164 large module 1RS 165 C10D126K-T 1/2W 12M 1 R531 166 large module 1RT 167 P10X180J-C PTC 18OHM(degauss nimble to heat 3 pin)
  • Page 32 1 C307 237 E20C470M 16V 47u 1 C295 238 E20C470M 16V 47u 239 E20C470M 16V 47u 1 C244 240 E20C470M 16V 47u 1 C240 1 C920 241 E20C470M 16V 47u 242 E20C470M 16V 47u 1 C916 243 E20C101M 16V 100u 1 C230 244 E20C101M 16V 100u...
  • Page 33 315 L3X1150K-T 15uH-K 1 L102 316 L3X1150K-T 15uH-K 1 L901 1 L305 317 L3X1150K-T 15uH-K 318 L3X1150K-T 15uH-K 1 L302 319 L3X1150K-T 15uH-K 1 L230 1 L201 320 L3X1150K-T 15uH-K 321 L3X1150K-T 15uH-K 1 L104 322 large module 4DC photoelectricity coupling ware 323 RX0001XX PC817B/C(ic) 1 VD515...
  • Page 34 1 Z901 415 large module 6OL lead and meet element power wire with plus(2m) 416 LXXX0010C 1 W501 417 LXXX0146-H 2P LINE(250mm especially for haier) 1 XZ1106 418 LXXX0176 1 XZ412 419 LXXX0188 TD19 local control board wire(180mm) 1 XZ1004...
  • Page 35 471 PNXX0010 D2.5*3.5rivet 1 P54 472 PNXX0010 D2.5*3.5rivet 1 P63 473 PNXX0010 D2.5*3.5rivet 1 P64 474 PNXX0020 D1.6*3.0rivet 1 P12 1 P15 475 PNXX0020 D1.6*3.0rivet 1 P18 476 PNXX0020 D1.6*3.0rivet 477 PNXX0020 D1.6*3.0rivet 1 P19 478 PNXX0020 D1.6*3.0rivet 1 P2 479 PNXX0020 D1.6*3.0rivet 1 P21...

  • Page 37: Circuit Diagrams

    B. Circuit Diagrams - 1 -...
  • Page 38 Sincere Forever Haier Group Tel :86-532-8938356 Web site : http://www.haier.com...

Table of Contents