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SERVICE MANUAL
Colour Television
1.
Safety precautions......................................................................................3
2.
TV block diagram.......................................................................................4
CAUTION
THIS MANUAL CAREFULLY TO DIAGNOSE
TROUBLE CORRECTLY BEFORE OFFERING
SERVICE .
CONTENTS
Haier model:
21F07
Customer model:
HTAF21B
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Summary of Contents for Haier 21F07
- Page 1 CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLE CORRECTLY BEFORE OFFERING SERVICE . SERVICE MANUAL Colour Television Haier model: 21F07 Customer model: HTAF21B CONTENTS Safety precautions……………………………………………………………..……………3 TV block diagram……………………………………………………………………..…….4...
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Page 2: Table Of Contents
Replacement of memory IC………………………………………………………….……5 Service adjustment……………………………………………………………..…………...5 ICs functional description…………………………………………………………………8 Test point waveform………………………………………………………………………10 All ICs voltages……………………………..……………………………………………….10 Purity / convergence adjustment………………………………………………………11... - Page 3 1. SAFETY PRECAUTIONS The design of this product contains special hardware, many Isolation Check circuits and components especially for safety purposes. For (Safety for Electrical Shock Hazard) continued protection, no changes should be made to the After re-assembling the product, always perform an isolation original design unless authorized in writing by the check on the exposed metal parts of the cabinet (antenna manufacturer.
- Page 4 Block diagram TDA8377PS/N2 series with mono intercarrier sound demodulator...
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Page 5: Replacement Of Memory Ic
3. REPLACEMENT OF MEMORY IC 1. MEMORY IC. This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and deflection circuits. 2. PROCEDURE FOR REPLACING MEMORY IC (1) Power off Switch the power off and unplug the power cord from AC outlet. (2) Replace IC Be sure to use memory IC written with the initial data values. - Page 6 Adjustable Items Direct access key Items Description Preset Remark “1” 5/6HSH Horizontal shift “2” 5/6VSL Vertical slop 5/6VAM Vertical amplitude 5/6SCL S-correction 5/6VSH Vertical shift 5/6VOF OSD Vertical offset HOF* OSD Horizontal offset “3” Black level offset R Black level offset G White point R White point G White point B...
- Page 7 2. OP2 Function Description Preset Remark Bit 7 1=21dBµV 0=26dBµV Bit 6 1=Enable Bit 5 ARABIC_SET 1=Enable Bit 4 FARSI_SET 1=Enable Bit 3 CYRILLIC_SET Bit 2 EUROUP_SET 1=Enable Bit 1 AUTO_SOUND Bit 0 1=Enable 3. OP3 Function Description Preset Remark Bit 7 RUSSIA 1=Enable...
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Page 8: Ics Functional Description
7. OP7 Function Description Preset Remark Bit 7 FMWS 1=Enable Bit 6 HOTEL 1=Enable Bit 5 PROG_ID 1=Enable Bit 4 1=Enable Bit 3 TWIST 1=Enable Bit 2 BYELORUSSIAN 1=Enable Bit 1 UKRANIAN 1=Enable Bit 0 1=Enable 8. OP8 Function Description Preset Remark Bit 6... - Page 9 IREF Reference current input Vertical sawtooth capacitor TUNER AGC Tuner AGC output AUDEEM/SIFIN1 *1 Audio deemphasize or SIF input DECSDEM/SIFIN2 Decoupling sound demodulator GND2 Ground 2 for TV processor SNDPLL/SIFAGC *1 Narrow band PLL filter Automatic Volume Levelling HOUT Horizontal output FBISO Flyback input/sandcastle output AUDEXT...
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Page 10: Test Point Waveform
In 1 Ch 1 input Out 2 (+) Ch 2 output (+) 4. N301: Vertical output (TDA8357A) Symbol Function Symbol Function INV IN Input PUMP UP Pump up power INV IN Input V OUT Vertical output Pump up power V PRO Vertical protection V OUT Vertical output... -
Page 11: Purity / Convergence Adjustment
TDA8377 0.18 0.17 TDA8357 AN 7522N 2.75 0.35 24C08/PCF8598 8. PURITY / CONVERGENCE ADJUSTMENT... - Page 12 PURITY ADJUSTMENT WEDGE Demagnetize CRT with the demagnetizer. DEFLECTION YOKE Loosen the retainer screw of the deflection yoke. Remove the wedges. Input a green raster signal from the signal generator, and turn the screen to green raster. Move the deflection yoke backward. P/C MAGNETS Bring the long lug of the purity magnets on the short P: PURITY MAGNET...
- Page 13 STATIC CONVERGENCE ADJUSTMENT 1. Input a crosshatch signal. 2. Using 4-pole convergence magnets overlap the red and blue lines in the center of the screen (Fig. 1) and turn them to magenta (red/blue). (FRONT VIEW) 3. Using 6-pole convergence magnets overlap the magenta (red/blue) and green lines in the center of the screen and turn them to white.
- Page 14 MENU TV/AV TJC3-2Y AV1-VINAV1-AL AV1-AR CNB02 CNS01 RS01 CT01 RT02 RS03 CNS02 RB04 RB03 RB02 RB05 RB01 CNB01 1.8K 1.2K TJC3-2Y CNT01 1/6W-100 TJC3-10A A6-5V R208 A6-5V N202 R286 R220 R212 R211 R215 R278 R222 24C08 CN704 CN200 CN703 A6-5V 3.3K 3.3K 3.3K...
- Page 15 Sincere Forever Haier Group Haier Industrial Park, No.1, Haier Road 266101, Qingdao, China http://www.haier.com...