Table of Contents
Advertisement
Quick Links
SERVICE MANUAL
FEATURES
DVD-TV 20" COMBO
AUTO TUNE/181 CHANNES
DVD/VCD/SVCD/CD/CD-R/CD-RW/JPEG/MP3 COMPATIBLE
FORMATO DE VIDEO 4:3PS、4:3LB
DOLBY AC-3 DECODE
PANATAL LOCK
ATSC TUNER
CAUTION
THIS MANUAL CAREFULLY TO DIAGNOSE
TROUBLE CORRECTLY BEFORE OFFERING
SERVICE .
Colour Television
Customer model:
Haier model:
DTA21F81
TCF20
READ
TV-8888-113
Advertisement
Table of Contents
Related Manuals for Haier DTA21F81
Summary of Contents for Haier DTA21F81
- Page 1 CAUTION READ THIS MANUAL CAREFULLY TO DIAGNOSE TROUBLE CORRECTLY BEFORE OFFERING SERVICE . SERVICE MANUAL Colour Television Haier model: DTA21F81 Customer model: TCF20 FEATURES DVD-TV 20” COMBO AUTO TUNE/181 CHANNES DVD/VCD/SVCD/CD/CD-R/CD-RW/JPEG/MP3 COMPATIBLE FORMATO DE VIDEO 4:3PS、4:3LB DOLBY AC-3 DECODE PANATAL LOCK...
-
Page 2: Table Of Contents
CONTENTS Safety precautions……………………………………………………………..……………3 TV block diagram……………………………………………………………………..…….4 Replacement of memory IC………………………………………………………….……5 Service adjustment……………………………………………………………..…………...5 ICs functional description…………………………………………………………………12 Test point waveform………………………………………………………………………14 All ICs voltages……………………………..……………………………………………….15 Purity / convergence adjustment………………………………………………………16 DVD maintenance…………………………………………………………………………18 10. Circuit Diagram …………………………………………………………………………19... -
Page 3: Safety Precautions
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: Tv Block Diagram
Block diagram R2J10165GC series with stereo intercarrier sound demodulator... -
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 AGC Adjustment Receive 60dBµ (1mV) VH colour bar pattern signal. Select RF AGC item. Adjust value, to noise reduce gradually and just disappeared point. CRT cut off and white balance adjustment a) CRT cut off adjustment 1. Select item VG2B, then adjust value to 32. 2.
- Page 7 Maintenance Service and Trouble shooting No raster Whether G2 voltage is normal Abnormal Normal Test filament voltage Test the base voltage of Q402 Normal Abnormal Normal Abnormal Heater Resistor Check to see if be Check the circuit Check the voltage open voltage of Q402 is from pin15 of IC201...
- Page 8 Maintenance Service and Trouble shooting Horizontal bright line Make R429 open. Multimeter is at range R Χ 1K. Red probe connects to ground. Touch No.5 of IC401 with black probe. Bright line flashes for a moment Check to see if voltage of pin2 at Check to see if the voltage of IC401 is normal pin 11 and pin12 of IC201 is...
- Page 9 Maintenance Service and Trouble shooting Picture exists but no sound Make C713/C714 open. Multimeter is at band RΧ1K. Red probe connect to ground. Touch No.6 OR No.8 of IC701 with No noise Have noise Make C713 OR C714 collector Power amplifier is abnormal. open.
- Page 10 Adjustable Items P1： Items Preset Remark Description H PHASE 0 ~ 31 Horizontal shift ★ Vertical amplitude V SIZE 0 ~ 63 ★ Vertical shift V POS 0 ~ 7 ★ Vertical slop V LIN 0 ~ 63 ★ V SC 0 ~ 63 S emendation ★...
- Page 11 P6： Items Preset Remark Description 0 ~ 1 № English OSD ；ON = Y；OFF = N 0 ~ 1 № French OSD ON = Y；OFF = N 0 ~ 1 № Spanish OSD ON = Y；OFF = N 0 ~ 1 №...
-
Page 12: Ics Functional Description
U DL 0 ~ 3 № U signal delay adjust V DL 0 ~ 3 № V signal delay adjust LCNR 0 ~ 63 № Down pillow shape distortion P11： Items Preset Remark Description C TRAP 0 ~ 3 2 №... - Page 13 VIF APC VIF APC RF AGC RF AGC VIF IN2 VIF IN2 VIF IN1 VIF IN1 VIF AGC VIF AGC VIF VCC F/B VIF VCC F/B VIF VCC(5.0V) 5.0V POWER EXT AU （R） IN/EXT AU1 EXT AU（R）IN/EXT AU1 IN AU BYPASS AU BYPASS SIF MIX F/B SIF MIX F/B...
-
Page 14: Test Point Waveform
3. IC701: Sound power amplify (TFA9800J) Symbol Function Symbol Function -INV1 Non-inverting input 1 Supply voltage Mute/standby switch SGND Signal ground M/SS input Supply voltage ripple SVRR -INV2 Non-inverting input 2 rejection output Out 1 Output 1 PGND Power ground OUT2 Output 2 4. -
Page 15: All Ics Voltages
7. IC voltages R2J10165G 0.02 4.9 0.03 4.72 0.04 0.15 2.05 8.04 2.99 2.36 3.2 0.83 0.93 2.04 1.15 1.15 2.97 3.2 3.76 3.91 5.59 2.28 8.73 3.29 1.97 2.73 5.68 2.86 2.74 0.17 1.47 1.47 2.53 3.09 3.3 3.45 2.4 3.43 3.15 3.43 2.47 8.03 2.57 2.49 2.59 8.87 0.42 4.9 4.94 4.95 3.82 1.96 0.33 2.9 4.95 4.94 4.95 0.16 4.95... -
Page 16: Purity / Convergence Adjustment
8. PURITY / CONVERGENCE ADJUSTMENT 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. - Page 17 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 18: Dvd Maintenance
9. DVD Part: Introduction of MTK1389D maintenance NOTE: MTK1389D type LSIC decode .MTK1389D consists RF,SERVO,DSP,DECODE,VIDEO DAC and AUDIO DAC. Under normal power supply conditions, the maintenance plan for MT1389D mono-chip is: first the reset circuit resets the MT1389D, after the crystal oscillator circuit gave the clock signal to MT1389D, MT1389D will start the initialization check for Flash、E PROM、SDRAM, after everything is checked to be normal, it will start initialization check for built-in Audio DAC, servo and motor Driver IC . -
Page 19: Circuit Diagram
10.Circuit Diagram... - Page 20 Sincere Forever...