Service Manuals, User Guides, Schematic Diagrams or docs for : HAIER TV 21FA11 HAIER+21FA11-AM+TV-8888+HTAF21S

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HAIER+21FA11-AM+TV-8888+HTAF21S


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                    CAUTION                      READ
                    THIS MANUAL CAREFULLY TO DIAGNOSE
                    TROUBLE CORRECTLY BEFORE OFFERING
                    SERVICE .




          SERVICE MANUAL
Colour Television




                             Haier model:
                              21FA11-AM
                            Customer model:
                                HTAF21S
                                                       .




                                               CONTENTS
1.   Safety precautions......................................................................................3

2.   TV block dia ram.......................................................................................4
                g

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




                                                       2
                                                                      .



1. SAFETY                                                                 PRECAUTIONS
1.   The design of this product contains special hardware, many           9.  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. Replacement parts must be identical to those               terminals, video/audio input and output terminals, Control
     used in the original circuits. Service should be performed by            knobs, metal cabinet, screw heads, earphone jack, control
     qualified personnel only.                                                shafts, etc.) to be sure the product is safe to operate without
                                                                              danger of electrical shock.
2.   Alterations of the design or circuitry of the products should        10. The surface of the TV screen is coated with a thin film which
     not be made. Any design alterations or additions will void the           can easily be damaged. Be very careful with it when handle
     manufacturer's warranty and will further relieve the                     the TV. Should the TV screen become soiled, wipe it with a
     manufacturer of responsibility for personal injury or property           soft dry cloth. Never rub it forcefully. Never use any cleaner
     damage resulting therefrom.                                              or detergent on it.

3.   Many electrical and mechanical parts in the products have            (1)   Dielectric Strength Test
     special safety-related characteristics. These characteristics              The isolation between the AC primary circuit and all metal
     are often not evident from visual inspection nor can the                   parts exposed to the user, particularly any exposed metal
     protection afforded by them necessarily be obtained by using               part having a return path to the chassis should withstand a
     replacement components rated for higher voltage, wattage,                  voltage of 3000V AC (r.m.s.) for a period of one second.
     etc. Replacement parts which have these special safety                     (...Withstand a voltage of 1100V AC (r.m.s.) to an appliance
     characteristics are identified in the parts list of Service                rated up to 120V, and 3000V AC (r.m.s.) to an appliance
     manual. Electrical components having such features are                     rated 200V or more, for a period of one second.)
     identified by shading on the schematics and by (  ) on                     This method of test requires test equipment not generally
     the parts list in Service manual. The use of a substitute                  found in the service trade.
     replacement which does not have the same safety                      (2)   Leakage Current Check
     characteristics as the recommended replacement part                        Plug the AC line cord directly into the AC outlet (do not use
     shown in the parts list of Service manual may cause shock,                 line isolation transformers during this check). Using a
     fire, or other hazards                                                     "Leakage Current Tester", measure the leakage current from
                                                                                each exposed metal part of the cabinet, particularly any
4.   Don't short between the LIVE side ground and                               exposed metal part having a return path to the chassis, to a
     ISOLATED (NEUTRAL) side ground or EARTH side                               known good earth ground (water pipe, etc.). Any leakage
     ground when repairing. Some model's power circuit is                       current must not exceed 0.5mA AC (r.m.s.).
     partly different in the GND. The difference of the GND is                  However, in tropical area, this must not exceed 0.2mA AC
     shown by the LIVE: (                ) side GND, ISOLATED                   (r.m.s.).
     (NEUTRAL): (       ) side GND and EARTH: (      ) side GND.                Alternate Check Method
     Don't short between the LIVE side GND and ISOLATED                         Plug the AC line cord directly into the AC outlet ( do not use
     (NEUTRAL) side GND or EARTH side GND and never                             a line isolation transformer during this check.). Use an AC
     measure with a measuring apparatus (oscilloscope etc.) the                 voltmeter having 1000 ohms per volt or more sensitivity in
     LIVE side GND and ISOLATED (NEUTRAL) side GND or                           the following manner. Connect a 1500 10W resistor
     EARTH side GND at the same time. If above note will not be                 paralleled by a 0.15F AC-type capacitor between an
     kept, a fuse or any parts will be broken.                                  exposed metal part and a known good earth ground (water
                                                                                pipe, etc.). Measure the AC voltage across the resistor with
5.   If any repair has been made to the chassis, it is                          the AC voltmeter. Move the resistor connection to each
     recommended that the B1 setting should be checked or                       exposed metal part, particularly any exposed metal part
     adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).                              having a return path to the chassis, and measure the AC
                                                                                voltage across the resistor. Now, reverse the plug in the AC
6.   The high voltage applied to the picture tube must conform to               outlet and repeat each measurement. Any voltage measured
     that specified in Service manual. Excessive high voltage can               must not exceed 0.75V AC (r.m.s.). This corresponds to
     cause an increase in X-Ray emission, arcing and possible                   0.5mA AC (r.m.s.).
     component damage, therefore operation under excessive                      However, in tropical area, this must not exceed 0.3V AC
     high voltage conditions should be kept to a minimum, or                    (r.m.s.).
     should be prevented. If severe arcing occurs, remove the AC                This corresponds to 0.2mA AC (r.m.s.)
     power immediately and determine the cause by visual
     inspection (incorrect installation, cracked or melted high
     voltage harness, poor soldering, etc.). To maintain the proper
     minimum level of soft X-Ray emission, components in the
     high voltage circuitry including the picture tube must be the
     exact replacements or alternatives approved by the
     manufacturer of the complete product.

7.   Do not check high voltage by drawing an arc. Use a high
     voltage meter or a high voltage probe with a VTVM.
     Discharge the picture tube before attempting meter
     connection, by connecting a clip lead to the ground frame
     and connecting the other end of the lead through a 10k 2W
     resistor to the anode button.

8.   When service is required, observe the original lead dress.
     Extra precaution should be given to assure correct lead
     dress in the high voltage circuit area. Where a short circuit
     has occurred, those components that indicate evidence of
     overheating should be replaced. Always use the
     manufacturer's replacement components.


                                                                      3
                                                       .


2.   Block diagram TDA8378PS/N2 series with mono intercarrier sound demodulator




                                                       4
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.
    (4) Check and set SYSTEM default value:
        1) Press "MUTE" 



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