Daewoo DPN-4274NHS Service Manual Download Page 52

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TROUBLE DIAGNOSIS

Fig. 6 Trouble Diagnosis Flow when LOW VOLTAGE “SHUT DOWN” occurs

YES

Unplug Connectors connecting High

Voltage and POWER PCB(CN806)

AC PWR "ON" =>

PWR "ON" with Remote Controller

"SHUT DOWN"

occur?

AC PWR "OFF" =>

AC PWR "ON" =>
PWR "ON" with Remote 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 DOWN"

occur?

Replace DIGITAL

Or DATA PCB

Replace MAIN

PCB

Replace SUB

PCB

Unplug Connectors connecting SUB
and POWER PCB(CN801)
Unplug Connectors connecting High
Voltage and POWER PCB(CN805)
Unplug Connectors connecting SUB
and MAIN PCB(JP117)

Turn AC PWR OFF

Set VOLTAGE SWITCH of POWER

PCB to LOW (Picture 6-2)

Summary of Contents for DPN-4274NHS

Page 1: ...rformance 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 Ser...

Page 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...

Page 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...

Page 4: ...AM PAL M N NTSC4 43 S VHS 50 60Hz Y C 2 sets each 3 2 DTV DVD INPUT 1080 i 720P 480P 480i 576P 576i Y Pb Cb Pr Cr COMPONENT SIGNAL 2 sets each 3 3 PC INPUT VGA SXGA Dot clock 120MHz 15 PIN D SUB 1 set...

Page 5: ...RGB 8BIT each 4 5 CELL PITCH 1 08 H X1 08 V mm 1 Pixel a Set of RGB Cells 4 6 PEAK LUMINANCE 400cd m2 WITH FILTER GLASS 4 7 CONTRAST RATIO 1500 1 Dark Room 4 8 VIEWING ANGLE 160 degree VERTICAL HORIZ...

Page 6: ...A O O 720x400 31 469 70 087 IBM O O 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 0...

Page 7: ...OO 004 012 014 017 068 069 094 096 097 098 102 103 104 DAYTRON 094 DBX 018 029 044 048 DENON 202 219 222 DISH 005 DYNATECH 057 ELECTROHOME 063 EMERSON 013 023 031 033 035 037 041 042 043 050 087 110 1...

Page 8: ...ENDE 048 ONKYO 215 OPTIMUS 211 OPTONICA 057 058 PANASONIC 070 074 078 086 114 125 224 225 PENTAX 019 026 037 039 067 PHILCO 037 039 PHILIPS 037 039 058 075 087 PILOT 087 PIONEER 019 027 052 212 220 PO...

Page 9: ...082 129 214 STS 019 SYLVANIA 037 039 063 TANDY 017 TATUNG 044 048 TEAC 044 048 TECHNICS 037 039 226 TEKNIKA 025 037 039 087 THOMSON 203 204 TMK 013 TOSHIBA 015 019 047 051 063 085 098 112 TOTEVISION 0...

Page 10: ...r 3 digit List ANAM 358 359 AKAI 354 DAEWOO 352 360 DENON 357 361 HYUNPAZ 362 KENWOOD 356 LG 350 368 369 MAGNAVOX 355 ONKYO 365 366 367 PANASONIC 357 370 PHILIPS 355 PIONCER 353 SAMSUNG 351 363 364 TH...

Page 11: ...TAR 064 095 097 101 ELECTRO HOME 092 EUROPLUS 115 FUJITSU 024 028 029 034 GENERAL INSTRUMENT 003 011 023 065 103 HUGHES 072 137 JANIEL 066 JERROLD 067 KATHREIN 110 LUXOR 068 MACOM 017 065 069 070 071...

Page 12: ...Brand Name Code Number 3 digit List SONY 105 138 STARCAST 047 SUPER GUIDE 027 123 124 TEECOM 030 033 078 090 091 093 109 TOSHIBA 002 126 143 UNIDEN 023 032 048 049 050 051 054 055 081 082 083 089 103...

Page 13: ...046 EASTERN 063 066 070 ELECTRICORD 039 GE 076 GEMINI 015 029 032 060 GI 001 GOLDEN CHANNEL 037 HAMLIN 055 056 061 HITACHI 001 061 HOSPITALITY 074 080 JERROLD 001 002 003 011 015 016 017 073 M NET 043...

Page 14: ...8 049 051 052 SHERITECH 029 SIGNAL 037 SIGNATURE 001 SKYLIFE 004 SL MARX 037 SPRUCER 053 081 STARCOM 002 011 015 016 STARGATE 015 037 SYLVANIA 071 TADIRAN 037 TANDY 024 TELECAPATION 028 TEXSCAN 036 07...

Page 15: ...14 3 BLOCK DIAGRAM...

Page 16: ...15 4 Description of A V MAIN and SUB PCB and POWER 4 1 Block Diagram of main IC and TP...

Page 17: ...hed composite video signal goes into IC130 and then to IC132 The switched Y C signal is directly inputted to IC132 One of composite video signal or Y C goes through IC134 for deinterlacing and IC140 f...

Page 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...

Page 19: ...age Processor Input 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 a...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 28: ...ce 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 Opaque Language English Keypad Lock...

Page 29: ...emote Controller 1 Check initial data of Service mode 1 PW 181 1 Sub Brt 24 Sub Cont 8 Bias R 32 Bias G 32 Bias B 32 Gain R 14 Gain G 16 Gain B 16 2 PW 181 2 DVI Brt 16 DVI Cont 0 Sharp Filter Normal...

Page 30: ...28 Contrast 64 Color 64 NR Off 7 Enhncr B W ON FCT ON ACR ON Gamma ON Dither ON SEISAI ON 8 MSP 34xx Sc pScale 21 FM pScale 25 9 Misc Tst Ptrn AT Tst Ptrn MA TV AT OFF ON 10 Info firmware version info...

Page 31: ...ot need to change initial values 1 DVI Brt For BRIGHTNESS adjustment DVI 2 DVI Cont For CONTRAST adjustment DVI 3 Sharp Filter For SHARPNESS adjustment Video S video 3 VPC3230 VIDEO DECODER control va...

Page 32: ...values do not need to be adjusted after replacing MAIN PCB Therefore you do not need to change initial values 1 Bright For BRIGHTNESS adjustment Video S video Component 2 Contrast For CONTRAST adjust...

Page 33: ...TD1 Standard Mode 1 Peak Luminance 100 False Contour Good STD2 Standard Mode 2 Peak Luminance 100 False Contour Bad HIQ1 High Image Quality Mode 1 Peak Luminance 70 False Contour Very Good HIQ2 High I...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 54: ...PKG42B3E2 01B 14 Digital 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 450 18...

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

Page 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...

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

Page 58: ...57 COMPONENTS PICTURE REMARK 1h Digital PKG 2 MAIN BOARD 3 SUB BOARD 4 POWER BOARD...

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

Page 60: ...59...

Page 61: ......

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