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TROUBLE DIAGNOSIS

(2) Symptoms of MAIN or SUB PCB Trouble

<Symptom.1> Only a weak discharge shows on the screen, but it is displaying No images.
<Symptom.2> Images are abnormal
<Symptom.3> Particular input signal (Video, PC or Component etc.) does not work.
<Symptom.4> No SOUND
<Symptom.5> Occasionally, set does not operate normally. Turning off and on the AC power make

the set to operate normal again.

<Symptom.6> Remote Control or KEY does not work.
<Symptom.7> POWER SHUT DOWN occur (refer to Service Manual I. 9-3 )

(3) Representative Symptoms caused by bad Connection between PCBs.

[Note] Dust or extraneous materials may cause bad connections. Most of the time, applying soft

brush, AIR FRESHER, or breath to clean dust or extraneous materials can solve it. And
then reassemble the Connector.

9-3. Trouble Diagnosis and Repairing Method for Representative Symptoms

(1) When POWER SHUT DOWN occurs

<1> Definition of “SHUT DOWN”

- While LED color is green, POWER PCB does not make any operating noise. (Red: STAND

BY, Green: Operating)

- When the set is turned on power relay does not operate normally, and POWER PCB does not

make any operating noise.

<2> Trouble Repairing Procedure

- As shown in Fig. 5, first check whether “LOW VOLTAGE” part or “HIGH VOLTAGE” part has

problems.

- If “LOW VOLTAGE” part’s problem is detected, diagnose and repair the SET as shown in Fig. 6.
- If “HIGH VOLTAGE” part’s problem is detected, diagnose and repair the SET as shown in Fig. 6.
- <Caution1> When disconnecting/connecting connectors, you MUST turn “OFF” the AC power

and check the direction and position of the connectors before working.

- <Caution2> Whenever you reassemble connectors connecting High Voltage Board and

POWER PCB(CN805, CN806), remaining voltage still exists in the POWER PCB
could cause electric shock and damage the set. Therefore always reassemble the
connectors several minutes after AC power is off. To be more careful, using a
MULTIMETER you should check to see if Vsus is less than 10V and then connect
connectors.

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Содержание DT-4220 NH

Страница 1: ...erformance without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Information Center http svc dwe co kr DAEWOO ELECTRONICS Corp Se...

Страница 2: ...ICE MODE 28 5 3 Description Of SERVICE MODE Items 30 6 Adjusting Method 33 6 1 Adjusting WHITE BALANCE 33 6 2 Adjusting POWER PCB 34 7 SOFTWARE UPGRADE Method 36 8 Main PCB Trouble Diagnosis 39 8 1 MA...

Страница 3: ...G make sure to check if any screw is missing when assembling reassembling Do not leave any screws inside the set 5 If you open the BACK COVER you will see a Panel Gas Exhaust Tube Picture 1 1 inside t...

Страница 4: ...VHS 50 60Hz Y C 1 set 3 2 DTV DVD INPUT 1080 i 720P 480P 480i 576P 576i Y Pb Cb Pr Cr COMPONENT SIGNAL 2sets 3 3 SCART INPUT SCART COMPOSITE R G B SOUND R L 2sets 3 4 PC INPUT VGA SXGA Dot clock 120MH...

Страница 5: ...2 ASPECT RATIO 16 9 4 3 NUMBER OF PIXELS 853 H X480 V 4 4 DISPLAY COLOR 1 677 Million Colors 8bits for each RGB 4 5 CELL PITCH 1 08 H x 1 08 V mm 1 Pixel a Set of RGB Cells 4 6 PEAK LUMINANCE 400cd m...

Страница 6: ...37 927 85 039 VESA O 800x600 35 156 56 250 VESA O O 37 879 60 317 VESA O O 48 077 72 188 VESA O O 46 875 75 000 VESA O O 53 674 85 061 VESA O O 1024x768 48 363 60 004 VESA O O 56 476 70 069 HP VESA O...

Страница 7: ...SA 053 054 BAIRD 043 102 BASIC LINE 028 060 072 BLAUPUNKT 026 085 090 097 106 108 BRANDT ELECTRONIQUE 043 044 089 BUSH 027 028 060 072 118 119 120 CAPEHART 060 CGE 038 043 089 CONTINENTAL EDISON 043 0...

Страница 8: ...43 073 086 IMPERIAL 038 095 INGELEN 043 044 089 105 INGERSOL 077 INNO HIT 092 ITT 018 043 083 102 ITT NOKIA 043 044 089 105 JENSEN 043 JVC 003 006 009 043 044 046 084 089 111 114 124 KENWOOD 018 043 0...

Страница 9: ...100 101 OPTONICA 048 049 ORION 010 030 031 032 058 072 077 OSAKI 038 054 PANASONIC 016 070 087 088 106 PATHE MARCONI 043 044 089 PENTAX 017 024 PERDIO 038 PHILIPS 005 040 042 045 048 049 053 064 078 0...

Страница 10: ...048 049 057 074 SHINTOM 028 SIEMENS 085 090 097 105 108 SIERA 048 090 108 SINUDYNE 077 SONY 047 050 051 076 080 STERN 043 044 089 STS 017 SUNKAI 072 SYLVANIA 038 052 SYMPHONIC 038 052 TASHIKO 038 TAT...

Страница 11: ...089 ZENDER 089 ZOPPAS 043 044 2 DVD Maker Brand Name Code Number 3 digit List ANAM 158 159 AKAI 154 DAEWOO 152 160 DENON 157 161 HYUNPAZ 162 KENWOOD 156 LG 150 168 169 MAGNAVOX 155 ONKYO 165 166 167 P...

Страница 12: ...BRIDGE 059 CAMBRIDGE ARD200 103 CHAPARRAL 011 CONNEXIONS 038 041 095 DAEWOO 002 DISKXPRESS 038 050 DRAKE 001 039 043 060 077 ECHOSTAR 015 020 046 049 064 065 071 085 ELTASAT 058 FERGUSON 044 047 051 0...

Страница 13: ...ANTZ 032 MASPRO 048 052 092 095 106 108 113 121 MATSUI 019 109 119 METZ 089 MINERVA 089 MULTISTAR 079 NEC 029 035 072 NEIRU 078 NOKIA 087 098 105 NORSAT 045 PACE 010 052 063 066 PACE MSS SERIES 066 PA...

Страница 14: ...0 123 124 TELEFUNKEN 082 TELEMAX 017 THORN FERGUSON 022 044 047 051 052 062 063 066 TRIACL 083 TRIAD 084 100 UNIDEN 057 074 075 079 VIDIO WAY 014 VORTEC 081 082 WINERSAT 093 WISI 003 021 025 026 046 W...

Страница 15: ...14 DT 4280NH BLOCK DIAGRAM 3 BLOCK DIAGRAM...

Страница 16: ...IC140 IC114 IC102 IC134 IC121 IC132 IC104 IC904 IC903 IC901 PC901 TUNER LED KEY PC101 PC102 PC102 PC900 JA109 JP117 PA102 P100 TO PWR TO PWR TO PDP MODULE PC103 TP116 TP117 TP130 TP128 TP204 TP205 TP1...

Страница 17: ...these signals and swithes out a selected signal Then the signal goes into IC132 for video processing SCART RGB signal goes directly into IC132 The output of IC132 goes through IC134 and IC140 for dei...

Страница 18: ...17 Description of A V MAIN and SUB PCB and POWER TP184 Horizontal sync output of IC140 TP187 Vertical sync output of IC140 TP181 Data enable output of IC140...

Страница 19: ...put 24bit digital RGB HV Output 24bit digital RGB HV Main TP Input Color Bar Pattern TP143 145 TP181 184 187 188 4 2 3 DTV DVD signal Both DTV Y Pb Pr and DVD Y Cb Cr share same jack and signal path I...

Страница 20: ...19 Description of A V MAIN and SUB PCB and POWER Main TP Input 480P Color Bar Pattern TP261 Y signal Input to IC121 TP134 Clock output to IC121 TP135 Horizontal sync output of IC121...

Страница 21: ...es through IC140 for digital image processing Main IC A IC109 Switching IC Input Analog RGB H V Output Analog RGB H V B IC114 A D converter Input Analog RGB H V Output 24bit digital RGB H V C IC140 Im...

Страница 22: ...gnal graphic card of AV device reads EDID data from IC101 ROM Then DVI signal is directly inputted to IC112 which outputs digital 24bit RGB and H V The output goes through IC140 for digital image proc...

Страница 23: ...ncer which improves picture quality greatly Outputs of IC149 are inputted to IC150 which is a LVDS transmitter The converted LVDS signal is transmitted to the digital board Main IC A IC149 Video enhan...

Страница 24: ...uch as Volume Balance and Equalize The outputs of IC904 are passed to IC901 left and IC903 right respectively to amplify the signals KEY and LED PCBs send signals received from key buttons and LED to...

Страница 25: ...z 66Hz Inrush Current Below 30A at AC264V Output Voltage is shown below No Output Voltage Variable Voltage Current Ripple Noise Rating Range Accuracy Rating mVp p 2 V V 1 A 1 Vs 175 160 190 5V 0 4 1 5...

Страница 26: ...12V GND 9 12V 10 NC Pin number CN806 is connected to CN301 of HIGH VOLTAGE PCB CN805 is connected to CN302 of HIGH VOLTAGE PCB CN803 is connected to PC103 of MAIN PCB CN801 is connected to PC900 of S...

Страница 27: ...26 Description of A V MAIN and SUB PCB and POWER 4 4 Interface with PDP Module PDP Module A V POWER...

Страница 28: ...Colour Temp Normal 2 Sound Balance 0 CENTER Effect Off AVC Off Mode Normal 120 Hz 0 CENTER 500 Hz 0 CENTER 1 5 KHz 0 CENTER 5 KHz 0 CENTER 10 KHz 0 CENTER 3 Screen Mode 16 9 4 Features Background Opa...

Страница 29: ...om firmware version The actual data applied to each set is equal to the data of when executing Servide Mode Reset Level 1 Sub Brt 24 Sub Cont 8 Bias R 32 Bias G 32 Bias B 32 Gain R 14 Gain G 16 Gain B...

Страница 30: ...AI ON 8 MSP 34xx Sc pScale 21 FM pScale 25 NC pScale 51 9 M2 Contrast 1 H Posi Full 30 Language 0 Option 2 CIK Full C40 0 CIK Full C56 0 Vposi Full 132 10 Misc Tst Ptrn AT Tst Ptrn MA AT Search ON ON...

Страница 31: ...not need to change initial values 1 DVI Brt For BRIGHTNESS adjustment DVI 2 DVI Cont For CONTRAST adjustment DVI 3 VPC3230 VIDEO DECODER control values Used to adjust picture quality of VIDEO S VIDEO...

Страница 32: ...deo S video Component 3 Color For COLOR adjustment Video S video Component 4 NR Noise Reduction Filter adjustment Video S video Component 7 Enhncr Picture Quality Enhancer Used to adjust picture quali...

Страница 33: ...ues service mode user menu 2 LEVEL 2 Reset all except PW181 1 values 3 FACTORY Reset user menu values 13 PANEL 1 50Hz Mode STD1 Standard Mode 1 Peak Luminance 100 False Contour Good STD2 Standard Mode...

Страница 34: ...0 005 y 0 275 0 005 and the Color Temperature to greater than 10 000 K 6 Attach the sensor of White Balance Meter to 40 of white level on the screen 7 Adjust White Balance by varying the values of R...

Страница 35: ...roblem after power adjustment classify as a defect and contact PDP module maker 1 Vs Vsus Voltage Sustain Voltage Measurement equipment Digital Volt Meter DC Volt mode Adjusting TP TP204 See Picture 6...

Страница 36: ...pper center of DATA BAR in PDP Module Typical Voltage Picture Picture 6 2 Picture 6 2 Power Adjustment Points Note 1 Auto Normal S W This switch is used to test power board therefore for normal operat...

Страница 37: ...e to the serial port of the computer 3 Connect the opposite end of the serial cable to RS 232C port of SUB PCB 4 Run Flashupgrader exe in the PC to excute the program as shown below 5 Select current U...

Страница 38: ...WARE UPGRADE Method 6 Select correct COM Port and Baud Rate 115200 as shown below Then press Flash button to finish setup 7 Turn on the ac power and then upgrade program will start the download as sho...

Страница 39: ...38 SOFTWARE UPGRADE Method 8 When the upgrading is complete a window below will be opened Press Finish button to complete the process...

Страница 40: ...R BAR pattern for detail examination only 8 Main PCB Trouble Diagnosis Does No signal screen appear Is the signal input Jack properly connected Does input source AV device work Is a weak discharge det...

Страница 41: ...COMPOSITE Input Check Positive polarity of CE203 located near IC132 S VHS input Check Negative polarity of CE284 located near IC159 If above signals do not appear MAIN PCB needs to be replaced 3 With...

Страница 42: ...gnal do not appear replace MAIN PCB 2 Check TP124 V SYNC TP125 H SYNC when 800 X 600 4 With Component inputs Check TP136 V sync TP135 H sync If signals do not appear replace MAIN PCB 3 When DTV 1080i...

Страница 43: ...42 Main PCB Trouble Diagnosis If above signal do not appear replace MAIN PCB...

Страница 44: ...rectly connected With a Video input video sound Outputs of 4th and 19th of JA109 ok Check 11th pin of IC901 903 Is the sound output of JP901 in JACK PCB normal Problem of SPEAKER or SOUND CABLE So rep...

Страница 45: ...k AC connection 2 Check Power S W ON 3 Check other PCBs 1 Replace the CONNCETOR 2 Replace Key PCB Check the connection of KEY PCB toMAIN PCB Check MAIN PCB Check start N N N Y Y Does LED turn on green...

Страница 46: ...ller working Does Set turn on by pressing a key button Using an oscilloscope check TP113 near PC101 Does it output a signal whenever a remote controller button is pressed 1 Check AC connection 2 Check...

Страница 47: ...voltage table lists 3 7 are NOT normal Or when set to high voltage output voltage table list 1 2 are NOT normal Refer to 4 3 When output condition of Power PCB is set to low voltage output voltage ta...

Страница 48: ...asure DIODE VOLTAGE SHORT OPEN TEST Screwdriver or electric screwdriver plastic adjusting tool Oscilloscope for detailed examination only 5 Each BLOCK operations explained in this manual include OSCIL...

Страница 49: ...finition of SHUT DOWN While LED color is green POWER PCB does not make any operating noise Red STAND BY Green Operating When the set is turned on power relay does not operate normally and POWER PCB do...

Страница 50: ...n is BLACK but Weak Discharge luminescence exists OSD does not show on screen and the set does not respond to remote controller or KEY panel buttons 2 PCB CHECK PRIORITY MAIN PCB SUS PCB 3 Repairing P...

Страница 51: ...refer to Fig 4 Turn AC power ON STAND BY YES Replace POWER PCB NO Disconnect CN801 CN803 CN805 CN806 of POWER PCB and set AUTO NORMAL S W of Power PCB to AUTO SHUT DOWN occur LOW VOLTAGE part is prob...

Страница 52: ...Controller Unplug Connectors connecting High Voltage and DIGITAL PCB CN601 Unplug Connectors connecting High Voltage and DATA PCB CN7 AC PWR OFF SHUT DOWN occur Replace High Voltage Or SCAN PCB SHUT D...

Страница 53: ...GH VOLTAGE SHUT DOWN occurs YES YES NO NO AC PWR OFF AC PWR ON PWR ON with Remote Controller Replace Scan Relay Board Replace failed PCB SHUT DOWN accur Diagnosis Complete Replace High Voltage Board D...

Страница 54: ...l PKG 485AS07290 PKG42B3C1 01D 06 15 GLASS FILTER 485A101180 42L4 MESH 16 CONNECTOR 4850705N31 12505HS 05 12505TS ULW 650 17 CONNECTOR 4850706N23 12505HS 06 12505TS ULW 500 18 CONNECTOR 4850710N16 YMH...

Страница 55: ...54 11 STRUCTURE OF PDP SET...

Страница 56: ...55 STRUCTURE OF PDP SET COMPONENTS PICTURE REMARK 1 PDP MODULE with F SUPPORT 1a HIGH VOLTAGE PKG 1b Common Bypass PKG 1c Common Relay PKG R...

Страница 57: ...56 STRUCTURE OF PDP SET COMPONENTS PICTURE REMARK 1d Data Relay PKG L 1e Data Relay PKG R 1f Scan Relay PKG T 1g Scan Relay PKG B...

Страница 58: ...57 STRUCTURE OF PDP SET COMPONENTS PICTURE REMARK 1h Digital PKG 2 MAIN BOARD 3 SUB BOARD 4 POWER BOARD...

Страница 59: ...58 STRUCTURE OF PDP SET COMPONENTS PICTURE REMARK 5 FRONT MASK 6 FILTER GLASS 7 BACK COVER...

Страница 60: ...59...

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