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Haier HT-3718 Service Manual
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Haier HT-3718 Service Manual

Haier HT-3718 Service Manual

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HT-3718
COLOUR TELEVISION
Serv ice Manual
I.
2.
3.
4.
5.
6.
7.
8.
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
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
)
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Summary of Contents for Haier HT-3718

  • Page 1 All manuals and user guides at all-guides.com 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...
  • Page 2 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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.

  • Page 6: Technical Specification

    All manuals and user guides at all-guides.com 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.
  • Page 7 All manuals and user guides at all-guides.com 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...

  • Page 8: Alignment And Adjustments

    All manuals and user guides at all-guides.com 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) •...
  • Page 9 All manuals and user guides at all-guides.com 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...

  • Page 10: Connecting To Other Equipment

    All manuals and user guides at all-guides.com 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.
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  • Page 19 All manuals and user guides at all-guides.com 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.
  • Page 20 All manuals and user guides at all-guides.com 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...
  • Page 21 All manuals and user guides at all-guides.com 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...
  • Page 22 All manuals and user guides at all-guides.com 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...
  • Page 23 All manuals and user guides at all-guides.com 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...
  • Page 24 All manuals and user guides at all-guides.com 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...
  • Page 25 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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.
  • Page 29 All manuals and user guides at all-guides.com (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 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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.
  • Page 34 All manuals and user guides at all-guides.com 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...

  • Page 35: Troubleshooting

    All manuals and user guides at all-guides.com 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.
  • Page 36 All manuals and user guides at all-guides.com 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...
  • Page 37 All manuals and user guides at all-guides.com 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...
  • Page 38 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 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...
  • Page 40 All manuals and user guides at all-guides.com 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 41 All manuals and user guides at all-guides.com...
  • Page 42 All manuals and user guides at all-guides.com 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...
  • Page 43 All manuals and user guides at all-guides.com 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...
  • Page 44 All manuals and user guides at all-guides.com 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...
  • Page 45 All manuals and user guides at all-guides.com 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...
  • Page 46 All manuals and user guides at all-guides.com 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...
  • Page 47 All manuals and user guides at all-guides.com 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...
  • Page 48 All manuals and user guides at all-guides.com 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...
  • Page 49 All manuals and user guides at all-guides.com 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...
  • Page 50 All manuals and user guides at all-guides.com 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...
  • Page 51 All manuals and user guides at all-guides.com 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...
  • Page 52 All manuals and user guides at all-guides.com 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...
  • Page 53 All manuals and user guides at all-guides.com 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...
  • Page 54 All manuals and user guides at all-guides.com 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...
  • Page 55 All manuals and user guides at all-guides.com 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 All manuals and user guides at all-guides.com 7.Block Diagram (1)Signal shooting block Sound power amf. IF.video color RGB 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.
  • Page 57 All manuals and user guides at all-guides.com...

  • Page 58: Sincere Forever

    All manuals and user guides at all-guides.com Sincere Forever Haier Group Tel:86-532-8938356 Web side:http://www.haier.com...