21” Colour Television SERVICE MANUAL Haier model: 21F7A-P Customer model:MT2024 PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.
. CONTENTS 1. Safety precautions……………………………………………………………..……………3 2. TV block diagram……………………………………………………………………..…….4 3. Replacement of memory IC………………………………………………………….……5 4. Service adjustment……………………………………………………………..…………...5 5. ICs functional description…………………………………………………………………8 6. Test point waveform………………………………………………………………………10 7. All ICs voltages……………………………..……………………………………………….10 8. Purity / convergence adjustment………………………………………………………11 9.
. 1. SAFETY PRECAUTIONS 1. The design of this product contains special hardware, many circuits and components especially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only. 9. 2. Alterations of the design or circuitry of the products should not be made.
. 2. Block diagram TDA8377PS/N2 series with mono intercarrier sound demodulator 4 PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.
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. (3) Power On Plug the power cord into the AC outlet and switch the power on.
Adjustable Items Direct access key “1” Items 5/6HSH Description Horizontal shift Preset ON Remark A “2” 5/6VSL 5/6VAM 5/6SCL 5/6VSH 5/6VOF HOF* Vertical slop Vertical amplitude S-correction Vertical shift OSD Vertical offset OSD Horizontal offset 21 45 20 38 38 20 A A A A A A “3” RED GRN WPR WPG WPB Black level offset R Black level offset G White point R White point G White point B 32 32 32 26 36 A A A A A “4” TOP VOL 9860 HDOL AGC VG2B IFO AGC Take-over point Volume Sub-volume of TDA9860/5
2.
5. ICs functional description 1. N501 UOC TDA8377 SYMBOL PIN STAND BY output.
RESET VDDP P1.0/INT1 P1.1/T0 P1.2/INT0 60 61 62 63 64 Ground Digital supply to periphery (+3.3 V) AV1 / AV2 mode Output. AV /S-VHS mode Output. Remote control signal input. Note Pin TV SVHS AV1 AV2 62 63 1 1 0 1 0 0 1 0 2. N902 24C08/PCF8598 PIN Function 1 2 3 4 5 6 7 8 GND GND Upper resistance GND SDA data wire SCL clock wire GND +5V Power 3.
6. Test point Waveforms 3.8Vpp 2.5Vpp 2.5Vpp H H H H TDA8377 PIN40 TDA8377 PIN53 95Vpp TDA8377 PIN52 0.9Vpp TDA8377 PIN51 5Vpp 2.6Vpp 1.2Vpp H TDA8377 PIN38 95Vpp 95Vpp H H CRT KG CRT KR H H H CRT KB TDA8377 PIN33 TDA8377 PIN34 1.3Vpp 0.8Vpp 1Vpp V V TDA8377 PIN21 TDA8377 PIN22 TDA8377 PIN59 7. IC voltages TDA8377 PIN V PIN V PIN V PIN V 1 0 17 4 33 0.5 49 1.9 2 3.8 18 0 34 0.3 50 5.0 3 3.6 19 4 35 0 51 2.4 4 3.3 20 0.5 36 1.7 52 2.4 5 3.5 21 0.7 37 2.4 53 2.4 6 4.4 22 0.
8. PURITY / CONVERGENCE ADJUSTMENT PURITY ADJUSTMENT WEDGE DEFLECTION YOKE 1. Demagnetize CRT with the demagnetizer. 2. Loosen the retainer screw of the deflection yoke. 3. Remove the wedges. 4. Input a green raster signal from the signal generator, and turn the screen to green raster. P CRT 5. Move the deflection yoke backward. 6. Bring the long lug of the purity magnets on the short lug and position them horizontally. (Fig2) 7.
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. 4. Repeat 2 and 3 above, and make the best convergence. Fig. 1 (FRONT VIEW) DYNAMIC CONVERGENCE ADJUSTMENT RED 1.
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0090207744 0090600015 0090506507 0090506312 0090505495 0090500018 0090206957 0094011232A BACK-COVER SCREW CARTON PACKING BAG FOR USER MANNUAL SERVICE CARD PLASTIC BAG PVC REMOTE CONTROLLER MTAA2110AC--Q SJ2824-87 ST4*12F 240*160 11、Exploded view 26 PDF 文件使用 "pdfFactory Pro" 试用版本创建 www.fineprint.com.
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