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Haier HT-3718 Service Manual

Colour television
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COLOUR TELEVISION

Serv ice Manual
Features
2
I C bus control
Turning TV on/off with curtain-fashion
218 programmes stored
Entire channel CATV(470MH
Multi-picture and multi-volume modes selection
Audio/Video input and output,S-Video terminal
Black background protection without signal
On-time,off-time,appointing programme
English OSD
Childlock
Haier group
HT-3718
I.
Precautions.................................1
2.
Specifications..............................5
3.
4.
Troubleshooting...........................34
5.
6.
Electrical Parts List.....................41
7.
Bolck Diagram.............................55
8.
Schematic Diagrams...................56
)
Z
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Summary of Contents for Haier HT-3718

  • Page 1: Table Of Contents

    HT-3718 COLOUR TELEVISION Serv ice Manual Precautions.........1 Specifications......5 Alignment and Adjustments..7 Troubleshooting......34 Exploded Views and Parts List..40 Electrical Parts List.....41 Bolck Diagram......55 Schematic Diagrams....56 Features I C bus control Turning TV on/off with curtain-fashion 218 programmes stored Entire channel CATV(470MH...

  • Page 2: Precautions

    1.PRECAUTIONS INPORTANT SAFETY NOTICE These parts are identified by many electrical and mechanical parts in this chassis have special safety-related characteristics. ！in the Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommterminaled in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
  • Page 3 SERVICEING PRECAUTIONS CAUTION: Before servicing receivers covered by this service manual and its supplements and addterminala, read and follow the SAFETY PRECAUTIONS. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions. Remember: Safety First.
  • Page 4 connecting the test receiver positive lead. Always remove the test receiver ground lead last. 9. Use with this receiver only the test fixtures specified in this service manual. CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity.
  • Page 5 maintain tip temperature within the range of 500 F to 600 2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead. 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.

  • Page 6: Specifications

    2. TECHNICAL SPECIFICATION 1. PWER SUPPLY AC 90v-250v 50/60Hz 2. COLOUT SYSTEM: PAL SECAM NTSC4.43/3.58 (AV) 3. TV SYSTEM: B/G D/K 4. CRT: 14” 5. AERIAL INPUT IMPEDANCE: 75Ω Standard Coaxial Cable ≥1W 6. SOUND OUTPUT POWER: ≤60W 7. POWER CONSUMPTION: 8.
  • Page 7 Products functions TYPE TYPE HT-3718 HT-3718 FUNCTIONS FUNCTIONS TA1238 Audio output power(w) Tube Super woofer PAL SECAM Color system NO of built-in speakers NTSC (A V) 3.58/4.43 Broadcast system B/G D/K Analog surround stereo No.of preset channels Treble/bass lifting and balancing...

  • Page 8: Alignment And Adjustments

    3.Alignment and Adjustments Functions: • C bus control • Display Full Function on Screen and infrared Remote Control • ASM System and fine Circuit, 100 Programs stored from 0 to 99 • Picture mode stored (don’t Adjust Brightness repeatedly) • Audio/Video input and output, S-video terminal •...
  • Page 9 Control A. Local control buttons HT-3718 HT3728 Power switch button Infrared sensor window Power indicator Program up/down button Volume up/down button TV/AV alternating button Menu display button Audio (R) input Audio (L) input Video input...
  • Page 10 CONNECTING TO OTHER EQUIPMENT The sockets son the back cover Aerial socket Video input socket Video output socket Audio input socket Audio output socket S- video socket Audio output (L) socket Audio output (R) socket Connecting to AV input sockets on the back cover connect the video and audio outputs of a VCR OR VCD player etc.
  • Page 19 The integrated circuit used in this set (1) TB1238AN: Picture intermediate frequency, sound intermediate frequency, video signal processing, chrominance signal processing, RGB output circuit and horizontal and vertical vibration scanning circuit. (2) TMP87CK38N: Super central microprocessor (3) LA7830: Vertical scanning circuit. (4) LA4275: Sound amplifier circuit.
  • Page 20 N251 TN1275AZ Reference resistance (KΩ) Reference voltage (V) Forward Function Reverse (red (black With Without grounding) grounding) signal signal Y output 2.96 Delay switch 4.04 R-Y output 2.43 R-Y output 0.31 B-Y output 2.44 B-Y blanking control 0.31 Recognition filter 4.54 Vacant 2.58...
  • Page 21 Function Reference Voltage(V) Reference Resistance(KΩ ) Without With Forward(Ω) Backward(Ω signal signal RF AGC output 2000 IF AGC filtering 2000 Color demodulation APC 3000 filtering 4.43MHz crystal oscillator 3000 Y/C circuit grounding Analog RGB and AKB mode alternating Analog R signal input 3000 Analog G signal input 3000...
  • Page 22 Function Reference Voltage(V) Reference Resistance(KΩ ) Without With Forward(Ω) Backward(Ω signal signal output Digital circuit power supply SECAM B-Y signal input 2000 SECAM R-Y signal input 2000 Y signal input 3600 Line AFC filtering 2000 External video/Y signal input 2000 Digital circuit grounding PIF composite video signal 2000...
  • Page 23 N901 87CM38N-3D27 Function Reference Voltage(V) Reference Resistance Without With Forward(Ω) Backward(Ω) signal signal Power supply grounding Tuning voltage output 8000 Vacant pin 8000 Mute 8000 External mute 8000 Vacant pin 8000 Standby power supply 8000 Vacant pin 1~4.2 1~4.2 8000 Band 1 3500 Band 2...
  • Page 24 Function Reference Voltage(V) Reference Resistance Without With Forward(Ω) Backward(Ω) signal signal Vacant pin 10000 Infrared receiving input 10000 Line synchronizing signal 10000 input Clock bus control 10000 Data bus control 10000 Vacant pin 10000 Vacant pin 10000 Vacant pin 10000 Power supply 2700 N101...
  • Page 25 The signals from Pin N201 (47) go through the sound intermediate frequency wave trap Z235 (D/K system) or Z236 (B/G system) and the emitter follower V212 so that the video complete TV signals are got out and sent to TV/AV electronic switch circuit through Pin (43). One part of the output signals go into the video signal processing circuit, the other go in the color signal processing circuit via C/VIDEO electronic switch.
  • Page 26 Power supply circuit The power supply circuit of HT-3718 is a typical free-running pulse width switch power supply. The structure of the main circuit belongs to step-down type. It is a cold mechanism power supply. The circuit is mainly composed of switch tube V513, exciter tube V512, switch transformer T501 and rectifying filter circuit.
  • Page 27 electrode of V513, the pulse width of which is controlled by capacitance C514. The collector electrode and emitter of V512 are merged between the base electrode and the emitter of switch tube V513. The conducting state of V512, i.e., the current through V512 controls the conducting time of V513.
  • Page 28 Adjustment A. Safety Precautions 1. It is safe to adjust after using insulating transformer between the power supply line 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 29 (2) Switch on the 220V main power supply and press the P+, P- buttons on user’s remote controller to check grid, electronic circle, color bar, test card (without color), three primary colors, color test card signals on position number 0, 1, 2, 3, 4, 5 respectively. It is required that no program is missed, otherwise use auto search or manual search to have all the signals received.
  • Page 30 4. Adjustment Enter the D-MODE maintenance state with special remote controller Press the D-MODE ON/OFF button on the factory remote controller 1 to enter the maintenance state. Character D will appear on the top right corner of the screen and the following items and data to be adjusted on the top left part: RCUT After entering the adjustment state, press button↑...
  • Page 31 Item Data Content RCUT Red dark balance GCUT Green dark balance BCUT Blue dark balance GDVR Green bright balance BDVR Blue bright balance Press the ⊟ button on the remote controller. A horizontal bright line will appear on the screen. Then adjust the screen grid (G2) potentiometer on the horizontal output transformer in such a way that the bright line on the screen is just visible.
  • Page 32 When the adjustment finishes, do not forget to switch off the set with the remote controller to quit the S-MODE maintenance state. (3) Parameter record list for factory adjustment items HT-3718 Factory Adjustment (D-MODE) Items Data Reference List Item Data...
  • Page 33 Item Data Content Item Data Content COLP P system chrominance WIDS 50/60 Hz horizontal size intermediate value COLS S system chrominance Frame compensation intermediate value SCNT Subcontrast Corner angle correction CNTC Subcontrast Horizontal compensation intermediate value CNTN 00 Min. subcontrast value SECAM B-Y BRTX Max.
  • Page 34 Item Data Content Item Data Content HPOS 50Hz horizontal center SELF Self-inspection tone TNTC intermediate value VP50 50Hz frame center SELF Self-inspection chrominance intermediate value 50Hz frame size Automatic recognition system 50/60 horizontal Screen display width center adjustment VP60 60Hz frame center Optional...

  • Page 35: Troubleshooting

    4.TROUBLESHOOTING No raster and no sound Check the fuse Abnormal Normal Check loading voltages of 112V 150V Check VD503∼VD506 V513 C507 Normal Abnormal Check if the connector electrode Check if all loading resistors are normal voltage of V552 is 26V. Normal Abnormal Abnormal...
  • Page 36 No raster Check if G2 voltage on CRT board is normal Normal Abnormal Check heater voltage Check the base electrode voltage of V444 Anormal Normal Normal Abnormal Check The heater Check the circuit Check voltage voltages resister is betwecn bace electrode between pin 32 at pins at X602 broken.
  • Page 37 Horizontal bright line Break R908 , let multimeter preset on R 1K and red meter rod grounding, let black meter rod tap pin 4 at N402.see if the bright line can wide at instant. There is breakdown in the vertical Check if R907 R448 output grate.
  • Page 38 Picture OK, no sound Break C700,let red meter rod ground and let black meter rod tap pin6 at N701, the speakers has snapping. If power amplifier is normal , Break the connector electrode of check N201 sound IF circuit V701, let the black meter rod and N201.
  • Page 39 RASTER OK, NO PICTURE, NO SOUND Whether there are noise dots? Whether there are voltages Check RAGC item of IC in every pin of tuner bus is set “00”. Use the remote controller and Check picture IF channel enter S-MODE and adjust and V231, V212, N201 RAGC to near 2D Aerial system or tuner...
  • Page 40 No words There is black words? Check L902,C926,C925 Check the circuit between pin 22pin 24 at D901 and pin 14pin 16 at N201 Abnormal Normal Check circuit between Replace V922,R915,C450 and pin 5 at compartment FBT.

  • Page 42: Electrical Parts List

    6.Electrical parts list Name Code Location Spcification Unit percent HT-3718WKL 10903800112 TZ-01 0094000202 37SX110Y22-DC05 Screw 0090600035 SJ2825-87 ST3*8F Rubber washer 0090300091 1mm, Clamp 0090200247 TMMOA101 Brand 0090200560 MTFA5008AA--Q Deflection wire 0090400176 JF4331-611--Q Degaussing coil 0094500447 HXC-35 CRT grounding assembly 0090400175 JE214-02-4--Q Screw 0090600034...
  • Page 43 Wire 0090400269 JT2281-B0064Q Wire 0090400270 JC2541-B----Q Back cover assembly 0090800340 BJH5004-----Q Back cover 0090200464 MTAA5019AC--Q Cloth 0090300098 15*100 Package assembly 0090801490 BBC5204-----Q Carton 0090501587 MTED5165CA--Q Plastic cover 0090500090 MTEA0021AF--Q Right pad 0090500211 MTEE5005AK--Q Left pad 0090500212 MTEE5006AK--Q staple 0090100165 65*2 Accessory poke 0090500094 MTEA0023AF--Q...
  • Page 44 Resister 0094100023 R235 RT13-1/6W-1K ±5%------T Resister 0094100023 R251 RT13-1/6W-1K ±5%------T Resister 0094100023 R252 RT13-1/6W-1K ±5%------T Resister 0094100023 R423 RT13-1/6W-1K ±5%------T Resister 0094100023 R907 RT13-1/6W-1K ±5%------T Resister 0094100023 R908 RT13-1/6W-1K ±5%------T Resister 0094100023 R912 RT13-1/6W-1K ±5%------T Resister 0094100023 R945 RT13-1/6W-1K ±5%------T Resister 0094100023 R957...
  • Page 45 Resister 0094100033 R292 RT13-1/6W-10K ±5%------T Resister 0094100033 R293 RT13-1/6W-10K ±5%------T Resister 0094100033 R258 RT13-1/6W-10K ±5%------T Resister 0094100034 R102 RT13-1/6W-15K ±5%------T Resister 0094100034 R212 RT13-1/6W-15K ±5%------T Resister 0094100034 R929 RT13-1/6W-15K ±5%------T Resister 0094100034 R294 RT13-1/6W-15K ±5%------T Resister 0094100779 R515 RT13-1/6W-22K ±5%------T Resister 0094100779 R551...
  • Page 46 Resister 0094101036 R451* RT15-1/2W-1.2K ±5%------T Resister 0094101002 R560 RT15-1/2W-3.3K ±5%------T Resister 0094101003 R462 RT15-1/2W-6.8K ±5%------T Resister 0094100954 R552 RT15-1/2W-47K ±5%------T Resister 0094100956 R501 RT15-1/2W-220K ±5%------T Resister 0094100956 R561 RT15-1/2W-220K ±5%------T Resister 0094101301 R520 RS11-1/2W-100K ±10%------T Resister 0094101301 R521 RS11-1/2W-100K ±10%------T Resister 0094101090 R531...
  • Page 47 Capacitor 0094200008 C632 CD110-16V-10 F-M------F Capacitor 0094200008 C975 CD110-16V-10 F-M------F Capacitor 0094200008 C976 CD110-16V-10 F-M------F Capacitor 0094201043 C205 CD110-16V-22 F-M------F Capacitor 0094201043 C206 CD110-16V-22 F-M------F Capacitor 0094200988 C107 CD110-16V-47 F-M------F Capacitor 0094200988 C203 CD110-16V-47 F-M------F Capacitor 0094200988 C219 CD110-16V-47 F-M------F Capacitor 0094200988 C282...
  • Page 48 Capacitor 0094201094 C253 CL21X-50V-0.1 F-K------F Capacitor 0094201094 C255 CL21X-50V-0.1 F-K------F Capacitor 0094201094 C444 CL21X-50V-0.1 F-K------F Capacitor 0094201094 C991 CL21X-50V-0.1 F-K------F Capacitor 0094201094 C992 CL21X-50V-0.1 F-K------F Capacitor 0094201094 C413 CL21X-50V-0.1 F-K------F Capacitor 0094201094 C707 CL21X-50V-0.1 F-K------F Capacitor 0094201115 C277 CL21X-50V-0.22 F-K------F Inducer 0094500316 L232...
  • Page 49 Jumper 0094101102 V261 0.6mm/5mm------B Jumper 0094101102 V262 0.6mm/5mm------B Jumper 0094101102 V263 0.6mm/5mm------B Jumper 0094101102 WR295 0.6mm/5mm------B Jumper 0094101103 W101 0.6mm/7.5mm------B Jumper 0094101103 W102 0.6mm/7.5mm------B Jumper 0094101103 W103 0.6mm/7.5mm------B Jumper 0094101103 W104 0.6mm/7.5mm------B Jumper 0094101103 W105 0.6mm/7.5mm------B Jumper 0094101103 W106 0.6mm/7.5mm------B Jumper 0094101103 W204...
  • Page 50 Jumper 0094101103 W956 0.6mm/7.5mm------B Jumper 0094101103 W957 0.6mm/7.5mm------B Jumper 0094101103 W958 0.6mm/7.5mm------B Jumper 0094101103 W959 0.6mm/7.5mm------B Jumper 0094101103 WC422 0.6mm/7.5mm------B Jumper 0094101103 WC416 0.6mm/7.5mm------B Jumper 0094101103 WR971 0.6mm/7.5mm------B Jumper 0094101103 WR972 0.6mm/7.5mm------B Jumper 0094101104 W207 0.6mm/10mm------B Jumper 0094101104 W220 0.6mm/10mm------B Jumper 0094101104 W221...
  • Page 51 Jumper 0094101105 W926 0.6mm/12.5mm------B Jumper 0094101105 W981 0.6mm/12.5mm------B Jumper 0094101105 W982 0.6mm/12.5mm------B Jumper 0094101105 W983 0.6mm/12.5mm------B Jumper 0094101105 W984 0.6mm/12.5mm------B Jumper 0094101105 WR250 0.6mm/12.5mm------B Jumper 0094101105 WR570 0.6mm/12.5mm------B Jumper 0094101105 WR916 0.6mm/12.5mm------B Jumper 0094101106 W224 0.6mm/15mm------B Jumper 0094101106 W235 0.6mm/15mm------B Jumper 0094101106 W286...
  • Page 52 Capacitor 0094201372 C505 CT81-10-2B4-1KV-1000PF-K-10-C-A Capacitor 0094201372 C506 CT81-10-2B4-1KV-1000PF-K-10-C-A Capacitor 0094201055 C553 CT81-10B-2B4-1KV-470PF-K-07-C-A Capacitor 0094201055 C554 CT81-10B-2B4-1KV-470PF-K-07-C-A Capacitor 0094201055 C555 CT81-10B-2B4-1KV-470PF-K-07-C-A Capacitor 0094201055 C560 CT81-10B-2B4-1KV-470PF-K-07-C-A Capacitor 0094201056 C556 CT81-10B-2B4-2KV-220PF-K-07-C-A Capacitor 0094201217 AW414 CT81-10-2B4-2KV-470PF-K-07-C-A Capacitor 0094201373 C516 CT81-10-2B4-2KV-680PF-K-07-C-A Capacitor 0094201374 C534 DE0910E471K-KX-10-C-A Capacitor 0094201215 C535...
  • Page 53 Transistor 0094400662 V101 2SC2216(O)----D-A Transistor 0094400600 V444 2SC2383(O)----D-A Transistor 0094400539 V512 2SC3807(R)----B-A Transistor 0094400575 V901 2SD400(D)----D-A Transistor 0094400575 V902 2SD400(D)----D-A Transistor 0094400552 V701 2SC536(E)----D-A Jumper 0094101205 W284 0.6mm/5mm------A SAW filter 0094600082 Z101 D38.9 Filter 0094600081 Z231 LT5.5MHZ Filter 0094600002 Z232 LT6.5MHz trap 0094600181...
  • Page 54 Resister 0094100025 R733 RT13-1/6W-1.5K ±5%------T Resister 0094100034 R732 RT13-1/6W-15K ±5%------T Resister 0094100946 R740 RT14-1/4W-33 ±5%------T Resister 0094101118 R708 RS11-1/2W-2.7K ±5%------T Resister 0094101118 R718 RS11-1/2W-2.7K ±5%------T Resister 0094101118 R728 RS11-1/2W-2.7K ±5%------T Capacitor 0094201088 C701 CC1-08-CH-63V-100pF-J------F Capacitor 0094201088 C711 CC1-08-CH-63V-100pF-J------F Capacitor 0094200977 C702 CT1-05-2B4-63V-390PF-K------F Capacitor...
  • Page 55 0094400565 LA4275 Screw 0090600067 GB9074.4-88 M3*10 0090600066 GB6170-86 M3 heatsink assembly 0090800219 BJB0067-----Q Heatsink 0090100115 MTBT2001BC--Q 0094400357 L7812CV Screw 0090600012 SJ2824-87 ST3*8F...

  • Page 56: Bolck Diagram

    7.Block Diagram (1)Signal shooting block Sound power amf. IF.video color H.V oscillation scan Tuner signal prossing H output V output EPROM Secam TA1275Z Remote co Infrared sensor AV input/output (2) TB1238AN Ａ EXT. EXT.C.IN EXT.Y.IN SIF band SIF trap pass filter unit unit Color subcarry...
  • Page 58 Sincere Forever Haier Group Tel:86-532-8938356 Web side:http://www.haier.com...

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