Haier RGBTV-25F99 Service Manual
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Haier RGBTV-25F99 Service Manual

Haier RGBTV-25F99 Service Manual

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COLOUR TELEVISION

Service Manual

1. Technical specifications &
2. Servicing precautions................................
4. Brief operation instructions........................
5. Disassembly instructions...........................
6. Specific information..................................
7. Electrical adjustment..................................
9. Damageable parts list................................
10.System block diagram...............................
Features
64cm pure flat picture tube
Auto search 218 programs presetting and memory
Child Lock & On Screen Help Function
16:9 Mode
Haier group
RGBTV-25F99
Safety precautions.....................................
2
3
8
10
11
13
30
32
34
35

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Summary of Contents for Haier RGBTV-25F99

  • Page 1: Table Of Contents

    RGBTV-25F99 COLOUR TELEVISION Service Manual 1. Technical specifications & Safety precautions........2. Servicing precautions........ 3. Functions & Location of controls....4. Brief operation instructions......5. Disassembly instructions......6. Specific information........7. Electrical adjustment........8. Information of Resistors and capacitors..9. Damageable parts list........
  • Page 2 Contents 1. Technical specifications & Safety precautions....2. Servicing precautions............3. Functions & Location of controls........4. Brief operation instructions..........5. Disassembly instructions............. Important notes Precautions for handling of picture tube Exploded of cabinet parts 6. Specific informations............Principle integrated circuits Service mode and adjusting items and datas Error detection process 7.

  • Page 3: Safety Precautions

    I. TECHNICAL SPECIFICATION & SAFETY PRECAUTIONS POWER SUPPLY: AC 150-250V, 50 Hz * Tuning system: voltage synthesized type autosearch fine tuning system * Power consumption: ¡Ü120W * Antenna input impedance: 75¦¸ * Receiving system: a) Color system: PAL/SECAM/NTSC3.58MHZ/4.43MHZ b) Broadcast TV system: D/K, B/G, I, M * Language displayed: English/Russian * Video input: 1.0VPP (75¦¸) * Video output: 1.0VPP (75¦¸)

  • Page 4: Servicing Precautions

    II SERVICEING PRECAUTIONS Warning and cautions 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 5: Servicing Precautions

    CAUTION Before servicing receivers covered by this service manual and its supplements and addenda, 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 6 on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a groundedtip soldering iron to solder or unsolder ES devices. 4. Use only an antistatic type folder removal device. Some solder removal devices not classified as "antistatic"...
  • Page 7 with solder braid) before removing the IC. Replacement Carefully insert the replacement IC in the circuit board. Carefully bend each IC lead against the circuit foil pad and solder it. Clean the soldered areas with a small wirebristle brush.(It is not necessary to reapply acrylic coating to the areas).
  • Page 8 4. Route the jumper wire along the path of the outaway copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped 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.

  • Page 9: Functions & Location Of Controls

    III.FUNCTIONS & LOCATION OF CONTROLS * Complete frequency range CATV (470MHz) * Preset of 218 programs. Curtaindrawing type of display when powered up. * Various kinds of picture modes and sound modes * Screen display of menu in English/Russian * Program scan * Surrounding stereo * I C bus control with digital technology * Zooming of pictures...

  • Page 10: Remote Control

    Buttons on the remote controller Remote control Standby Program number Display on the screen Sleep timer TV/AV HELP Help AV/TV exchange Former programme Mute Mono/stereo Calling menu Program up MENU Volume down Volume up Program down SCAN ZOOM Program scan Zoom FUNC Setting function menu...

  • Page 11: Brief Operation Instructions

    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 down the power switch of the TV set. The red indicator light goes on. Follow the steps below. A£®Program preset 1.

  • Page 12: Disassembly Instructions

    NEVER LIFT TUBE BY ITS NECK! The picture tube must not be scratched or subjected to excessive pressure as fracture of glass may result in an implosion of considerable violence which can cause personal injury or property damage EXPLODED VIEW OF CABINET PARTS Model: RGBTV-25F99...

  • Page 13: Exploded View Parts List

    Exploded view parts list Model: RGBTV-25F99 Name of part Part specialized code QTY. Front frame 0090200120 Left speaker 0094000018 Right speaker 0094000018 Color picture tube 0094000927 Bracket 0090802087 Rear cover 0090801480 Flank AV 0094300018...

  • Page 14: Specific Information

    VI.SPECIFIC INFORMATIONS A. Principle integrated circuits 1. RGBTV25F99 color TV set composed of the following sections (1) Microprocessor control: microprocessor N901 (WH2000) and memory N902 (KS24C08). (2) Small signal processing: super monolithic integrated circuits N201 (TDA8844) (3) Sound processing and power amplifying: integrated circuits N701 (TDA9859) and sound power amplifying integrated circuits N601 (TDA7297) (4) Line and field scan output integrated circuits: field output integrated circuits N301 (TDA8350Q), line output tube V403 (2SD1887YD), line output transformer T444...
  • Page 15 Table 1 Working Ground Resistance (R) Step Function Voltage Positive Negative (¦¸) (¦¸) Tuning voltage control output 19.9K 19.9K UHF channel selection control 3.7M 2.4M VHF-H channel selection control 3.7M 2.4M VHF-L channel selection control 3.7M 2.4M B/G sound system selection control 3.7M 1.4M D/K sound system selection control...
  • Page 16 Clearing recovery, low-level effective 3.7M 2.5M +5V power supply 21.8K Neutral point 3.8M 2.4M Remote control signal input Grounding Production control Brightness and color segregation 23.9K control AV1, AV2 and SVHS switching 23.8K control input C serial bus clock line C serial bus datum line 2.
  • Page 17 Internal video signal input 3.9M 3.6M Grounding Audio signal input 6.2M 4.7M SECAM decoder decoupling External video signal input 6.1M 4.4M Dark current test input 4.4M 3.7M B signal output 7.6K 7.6K G signal output 7.5K 7.5K R signal output 7.5K 7.6K Beam current limit and field max.
  • Page 18 High pressure tracing and circuit 23.1K 22.8K breaker input Capacitor connection from field 6.2M 4.6M tooth wave Field reference current formation 39.0K AGC decoupling 6.2M 4.6K RF AGC output 4.8K 4.8K Audio frequency connection 4.5M 4.6M without aggregation Sound demodulation 6.2M 4.6M decoupling...
  • Page 19 Some other combined television signals are connected via V205 and V206, which are band eliminating triodes functioning as switches. When the 12 base pin of CPU has a high electrical output level, V206 is connected using PAL system signals. When 12 base pin has a low electrical output level, V206 is disconnected and V205 is connected for NTSC3.58 system signals.
  • Page 20 Grounding Right track audio frequency 10.8K 10.8K output Right track audio frequency 4.6M 3.1M input Bass control capacitor 4.6M 3.1M connection Bass control capacitor 4.7M 3.1M connection Neutral point High control capacitor 6.2M 4.2M connection Audio frequency output and 8.8K 8.8K right track C bus clock line...
  • Page 21 6. Analysis of sound and bass power amplifying circuits Sound power amplifying circuits are composed of integrated circuits TDA7297 and peripheral components. TDA7297 is an integrated electrical circuit for muting and power for double track stereo sound power amplifying with an output power of 15+15W. The output of TDA7297 for sound is BTL and no decoupling capacitor is used in the output circuits.
  • Page 22 geometric processing, is transmitted from (47) and (46) of N201 to (1) and (2) of field output circuit N301. The external resistor R258 (39K ) of N201 (52) provides a reference current to the field tooth wave generator. The external capacitor C233 (104) of (51) forms a capacitor for the field tooth wave.
  • Page 23 centering. The capacitor C238 (103) connected to (42) is for wave filtering of PH2 tester. Line pumping signals are transmitted from (40) of N201 to line promotion triode V402 (KSC2331), and then drive the deflection coil to produce a magnetic field through the triode tube V403 (2SD1887) after being amplified through the switch to control the horizontal scan of the electronicbeam.

  • Page 24: Service Mode And Adjusting Items And Datas

    10. Analysis of switch power circuits The installed switch power source is a typical autonomous pulse switch power source. When the switch is set to on or off, the pulse voltage of the 220V voltage from the transmission line system rectified by VD810 rectifier is filtered by the capacitor C806 (220u) to obtain +300V direct current, which is added to (1) of the power integrated circuits N801 (KA3S0680RFBYDFU inlet) through (1)(4) of the switch transformer T801 (BCK10002).
  • Page 25 If 2.GEOMETRY is selected, a half image or a full image can be displayed in rotation if button 8 is pressed. If 3.PICTURE is selected, a horizontal line can be displayed or removed if button 0 is pressed. Maintenance menu 1 IF Adjustment (Table 7) Item Specifications Range...
  • Page 26 Maintenance menu 3 PICTURE (Table 9) Adjustment of acceleration limit: press button 0 to adjust the acceleration limit and a bright line will appear. White balance: Multi audio and video mode degaussing, fixing R pumping, adjusting B and G pumping. Maintenance menu 4 MULTISET (Table 10) Item Specifications...
  • Page 27 Maintenance menu 6 OPTION (Table 12) Item Specifications Range Default Remark Value OPTION1 Not adjustable OPTION2 Not adjustable ROWCON Character display vertical 0~1FH position CLMCON Character display horizontal 0~1FH position OPTION3 Not adjustable Maintenance menu 7 NICAM (Table 13) Item Specifications Range Default...

  • Page 28: Error Detection Process

    C. Error Detection Process 1. Raster free If +B is normal Abnarmal Nomal Check to see if voltage Inspect bulb filament, video is nomal when W936 is emission and shield grid voltage. broken. Abnormal None Check to see if Check to see if CPU CRT cathode voltage is normal.
  • Page 29 3. Failure of remote control Check to see if receiver voltage is normal. Abnormal Normal Inspect CPU voltage. Inspect receive. Inspect N804 base pin. Inspect R942 and C921. Check to see if voltage Inspect N901. output available at F802. 4. Screen display Check to see if character polarity of preduction mode is altered.
  • Page 30 5. Failure of TV sound Check to see if audio frequency signal output available at N201(55) Available Check to see if audio Check to see if audio frequency intermediate frequency signal input at N701(3) and (5). input avaiable at N201(1). Available Check to see if audio frequency Inspect N201(56).

  • Page 31: Electrical Adjustment

    VII. ELECTRICAL 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 32 Receive grid signal. Press factory handset button to enter the adjustment status. Enter GEOMETRY. First adjust PSC/NSC until the geometrical distortion in the eastwest direction is minimum. Adjust PEC/NEC until the geometrical distortion in the four corners is Minimum. Adjust PET/NET until the upper and bottom keystone distortion is minimum. Adjustment of character positions Adjust ROWCON and CLMCON for the vertical and horizontal positions of the screen menu.

  • Page 33: Information Of Resistors And Capacitors

    VIII. INFORMATION OF RESISTORS AND CAPACITORS RESISTORS & CAPACITORS PARTS 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 uF(microfarad). UF=1000PF Numbering system of Capacitor Example CL42...

  • Page 34: Terminal View Of Transistors

    Terminal view of transistor KSC815-YTA KSR1010TA KSA539-YTA KSR2010TA SA614-YK 2SD18887YD KSC2331-YTA BC548-CTA...

  • Page 35: Damageable Parts List

    IV. DAMAGEABLE PARTS LIST Model:25F99 Circuit di agram Name of part Part specialized code QTY. remark N301 0094400185 V403 TRANSISTOR 0094400184 N501 0094400186 N801 0094400189 C806 CAPACITOR 0094200132 L801 POWER FILTER 0094500031 R601¡¢R602 FUSE RESISTOR 0094101529 R408 FUSE RESISTOR 0094100122 F801 FUSE 0094000012...
  • Page 38 -F/B -F/B 2-IN 1-IN...
  • Page 39 TO C & F 180V 7-5.1V 6-8V 3-12.7V 3-12.7V...
  • Page 40 G N D V D D 4-15V...
  • Page 41 Sincere Forever Haier Group Tel:86-532-8938356 Web side:http://www.haier.com...

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