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Maintenance Service and Trouble shooting

Make C703 open. Multimeter is at band R

1K. Red probe

connect to ground. Touch No.7 of N701 with black probe

Picture exists but no sound

Make V701 collector open. Touch

No.7of V701 with black probe to

see if noise exists

Power amplifier is abnormal.

Inspect N701 and peripheral

components of N701

Inspect V701

、

V103

Check to see if

+20V exists

Inspect N204 and peripheral

I20V

Yes

Have noise

No noise

power supply

component of N204

Yes

Inspect

Inspect the circuit

from No.50of N204 to

Yes

Change V611 or

weld V611 again

Check to see if voltages of

XZ601 are normal

Lack of red

Check to see if V611 is

Inspect R616,R617,R236

open or not well welded

No.3 of XZ603

Содержание 21F3A-T

Страница 1: ...ELEVISION Service Manual MODEL 21F3A T THAILAND Features 54cm pure flat picture tube Auto search 218 program presetting and memory Child lock on screen help function Haier Group NO M AS TH 21T3A T 8823 Edition 2003 3 1 ...

Страница 2: ...nd Cautions 6 6 Net dimension 12 7 Parts and Functions 13 8 Remote Controller Functions 14 9 Program Diagram 15 10 Maintenance Service and Trouble shooting 16 11 Circuit Diagram 22 12 Circuit Explanation 23 13 Adjustment 28 14 Exploded View 34 15 List of Parts 35 16 Damageable Parts List 45 17 Information of Resistors and Capacitors 46 1 ...

Страница 3: ...e illumination and Series Introduction 21 F 3A T Compony of Signal processor IC T Toshiba Product Code illumination and Series Introduction CRT size unit inch Type of CRT F pure flat Model series of cabinet mumber 2 ...

Страница 4: ...uilt in speakers 2 17 AUDIO Auto volume leveling 40 Audio output power W 3 18 AV input back 1 side1 41 Total power input W 70 19 AV output back 1 42 Voltage range V 220 20 DVD terminal back 1 43 Power frequency Hz 50 21 S video jack back 1 44 Time of sleep timer MINS 120 22 Headphone socket side 1 45 Net weight KG 24 23 JACK SCART socket 46 Gross weight KG 26 47 Net dimension MM 576 395 458 48 Pac...

Страница 5: ...ltage synthesized type auto search fine tuning system IF 38 9MHz Power consumption 70W Antenna input impedance 75Ω Receiving system a Color system PAL NTSC3 58MHz 4 43MHz b Broadcast TV system B G Language displayed THAILAND Video input 1 0VP P 75Ω Audio input 436m Vrms 40KΩ 4 ...

Страница 6: ...orts of the circuitry that might be inadvertently introduced during the service operation If any fuse or Fusible Resistor in this TV receiver is blown replace it with a specified one When replacing a high wattage resistor Oxide Metal Film Resistor over 1W keep the resistor 10mm away from PCB Keep wires away from high voltage or high temperature parts Due to the high vacuum and large surface area o...

Страница 7: ...he TV set isn t going to be used for long time or it is in thunder and lightening please pull out the plug from AC outlet and the antenna plug from the cover of the TVset Explanation on the display tube Generally it is not needed to clean the tube surface However if necessary its surface can be cleaned with a dry cotton cloth after cutting off the power Don t use any cleanser If using hard cloth t...

Страница 8: ...ton using an insulating handle to avoid personal contact with high voltage 4 Do not spray chemicals on or near this receiver or any of its assemblies 5 Unless specified otherwise in this service manual clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner cotton tipped stick or comparable nonabrasive applicator 10 by volume Acetone and 90 by volume is...

Страница 9: ...fficient to damage ES devices 6 Do not remove a replacement ES device from its protective package until immediately before you are ready to install it Most replacement ES devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparable conductive material 7 Immediately before removing the protective material from the leads of a replacement ES device touc...

Страница 10: ...lacement Some chassis circuit boards have slotted holes oblong through which the IC leads are inserted and then bent flat against the circuit foil When holes are of slotted type the following technique should be used to remove and replace the IC When working with boards using the familiar round hole use the standard technique as outlined Removal Desolder and straighten each IC lead in one operatio...

Страница 11: ...er side the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between th...

Страница 12: ...n at connections other than IC Pins This technique involves the installation of a jumper wire on the component side of the circuit board 1 Remove the defective copper pattern with a sharp knife Remove at least 1 4 inch of copper to insure that a hazardous condition will not exist if the jumper wire opens 2 Trace along the copper pattern from both sides of the pattern break and locate the nearest c...

Страница 13: ...Net dimension 6 Net dimension Haier 12 ...

Страница 14: ...r Headphone socket Video R L audio 2 Rear panel of the TV set S VIDEO Y Cb Cr OUT IN VIDEO AUDIO VIDEO AUDIO Antenna input socket Video Cr input terminal Audio left channel input terminal Audio right channel input terminal Audio left channel output terminal Audio right channel output terminal Video Cb input terminal Video Y input terminal Video input terminal Video output terminal S VIDEO input te...

Страница 15: ...button Used for setting lock for channel searching channel AV and clock etc 1 2 3 4 5 6 7 8 9 10 11 13 14 15 16 17 18 19 20 21 22 Menu Select Adjust Button Use this button to adjust the menu the volume and the channels as well as to control the game Chromaic Belt Length Adjust Button this machine has not this function Program Play forward Button Calendar on BAR Button this machine has not this fun...

Страница 16: ...s the key 2 Manual search and fine tune Press MENU button then use the key to call up the tune program menu on the screen Then Press the menu item to select it Use the key to select the bar Manual search program then press the to make sure 3 Deleting channel number Press Program up down buttons to select a channel to skip Press MENU to call Menu then use the key to call up the TUNING menu on the s...

Страница 17: ... Horizontal and Vertical scan output circuits Vertical output integrated circuits N402 LA7840 Horizontal output transistor V411 2SD1879 Horizontal flying back transformer T402 JF0501 19910 4 Switch power supply switch transformer T501 BCK 08A6F power transistor V503 2SC4236 5 AV switch integrated circuits N203 TC4053 A2 Main integrated circuits 1 TMPA8823CSN Microprocessor Picture IF sound IF vide...

Страница 18: ...v is normal Check the control voltage of V572 or CPU power pin Check N902 V905 ect Normal Normal Abnormal Checktosee110V 180V etc voltageisnormal T esttoseeallterminal Resistanceofload Checkswitch power unit Check to see if rectifying tube is normal Check the Loader Change rectifying diode Abnormal Normal Abnormal Normal Abnormal Normal Abnormal The failure of horizontal unit orN204 Maintenance Se...

Страница 19: ...rmal Normal Check the voltage Heater Resistor open Check to see if be voltage of V411 is existed Check the circuit from pin13 of N204 to V444 No raster Whether G2 voltage is normal Change wrong component or check Check to see if 9V voltage is normal at PIN 17 of N204 Check Z901 N204 and Check 9V power supply Abnormal Normal Test filament voltage Test the base voltage of V444 Maintenance Service an...

Страница 20: ...mal Yes No Make R328 open Multimeter is at range RΧ1K Red probe connects to ground Touch No 5 of N402 with black probe Bright line flashes for a moment Horizontal bright line 3 Normal and N402 itself 4 Enter D MODE or enter S MODE with c remote controller 19 Snowy noise exist No sound and picture Not exist Exist Check to see if RAGC is at 00 mode Check to see if voltage output available at tuner u...

Страница 21: ...wer amplifier is abnormal Inspect N701 and peripheral components of N701 Inspect V701 V103 Check to see if 20V exists Inspect N204 and peripheral Inspect 20V Yes No Yes No Have noise No noise power supply component of N204 6 Yes No Inspect Inspect the circuit from No 50of N204 to Yes No Change V611 or weld V611 again Check to see if voltages of XZ601 are normal Lack of red Check to see if V611 is ...

Страница 22: ... or buildings Check if the direction of the antenna is changed The antenna may be disconnected or falling out Check ifthe direction of the antenna is changed The batteries in the remote control may be exhausted The batteries may be improperly installed Check if there are obstacles between the remote control and the remote infrared ray receiver Check if there is strong light interference around the...

Страница 23: ...11 Circuit Diagram The value of differrent component maybe changed for advantages Circuit Diagram 22 ...

Страница 24: ...Circuit Explanation 2 PCB Diagram 23 ...

Страница 25: ...und IF Amplifier Video and audio signal Processing RGB Output Circuits and H V Sync pulse segregation SAW Sound Power Amplifier Main Processor ROM Audio Video In Out Horizontal Scan Output Vertical Scan Output CRT Infrared Receiver Remote Controller 24 ...

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