LG RT-20LA30, Service Manual

Page 1: ...TION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS MF 002A MODEL RT 20LA30 website http biz LGservice com e mail http www LGEservice com techsup html Dec 2001 Printed in Korea P NO 3828VD0090E ...

Page 2: ...TS Contents 2 Safety Precautions 3 Servicing Precautions 4 Descriptions of Controls 6 Adjustment Instruction 9 Troubleshooting 18 Exploded View 20 Exploded View Parts List 21 Replacement Parts List 22 SVC Sheet ...

Page 3: ...perform an AC leakage current check on the exposed metallic parts of the cabinet such as antennas terminals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on positioin connect one lead of...

Page 4: ...s are integrated circuits and some fieldeffect transistors and semicounductor chip components The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity 1 Immediately before handling any semiconductor component or semiconductor equipped assembly drain off any electostatic charge on your body by touching a known earth ground Alter...

Page 5: ...the corresponding lead on the circuit board 4 Securely crimp each connection and solder it 5 Inspect on the circuit board copper 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 ...

Page 6: ...ee the next page 1 POWER switches the set on from standby or off to standby 2 NUMBER BUTTONS switches the set on from standby or directly select a number 3 MENU selects a menu 4 D D E E Programme Up Down selects a programme or a menu item switches the set on from standby F F G G Volume Up Down adjusts the volume adjusts menu settings OK accepts your selection or displays the current mode 5 Q VIEW ...

Page 7: ...text function Battery installation The remote control handset is powered by two AAA type batteries To load the batteries turn the remote control handset over and open the battery compartment Install two batteries as indicated by the polarity symbols and marked inside the compartment Note To avoid damage from possible battery leakage remove the batteries if you do not plan to use the remote control...

Page 8: ...TANDBY INDICATOR r r illuminates brightly when the set is in standby mode dims when the set is switched on 8 REMOTE CONTROL SENSOR 9 HEADPHONE SOCKET Connect the headphone plug to this socket 10 AUDIO VIDEO IN SOCKETS AV2 Connect the audio video out sockets of exter nal equipment to these sockets S VIDEO AUDIO IN SOCKETS SAV Connect the video out socket of an S VIDEO VCR to the S VIDEO socket Conn...

Page 9: ...ng Equipment 1 Pattern Generator 408NPS READER which 10 STEP is possible 2 A Remote Control for Adjustment 4 2 Adjustment 1 Select RGB LEVEL by pressing SVC Key of Remote Control for Adjustment 2 Adjust that until 9th and 10th STEP is undistinguished by using VOL Key in R LVL item 3 Adjust G LVL and B LVL as same way 4 When adjustment is finished Store it by pressing OK key And escape it by pressi...

Page 10: ...SCART 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 OPTION Data 200 PRO TEXT I II SA TOP A2 ST SYS 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

Page 11: ... SCART 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 OPTION Data 200 PRO TEXT I II SA TOP A2 ST SYS 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ...

Page 12: ... 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 SCART 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 OPTION Data 200 PRO TEXT I II SA TOP A2 ST SYS 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 24...

Page 13: ...RESERVED RESERVED ACMS 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 LANG 5 6 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 BBACK 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 VOL 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 DATA 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 ...

Page 14: ...3 Arab France Arab English Arab Hebrew 1 Arab Hebrew 2 Farsi English Farsi France Farsi all DATA KEY TSS PANEL IIC T MD SA CH AU MONO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0...

Page 15: ... 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 DATA KEY TSS PANEL IIC T MD SA CH AU MONO 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 ...

Page 16: ...0 1 0 INVT 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 DATA KEY TSS PANEL IIC T MD SA CH AU MONO 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

Page 17: ...1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 INVT 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 ...

Page 18: ...nd the pin legs of P802B connector recheck them 2 Check and repair the IC806 807 SI4925 IC801 SI786 IC803 SI4808 P502 and Pin 21 connector 1 Check and fix P503B connector being slipped out 2 Check and fix the components at P502 LCD module and at main board 3 Check Pin50 Cracked components and 1 Check and repair tuner board and main board soldering at tuner board 2 Solder Q101 2 Dark screen 1 Defec...

Page 19: ...MEMO 19 ...

Page 20: ... 20 EXPLODED VIEW 310 330 560 540 300 120 400 430 410 420 112 174 A4 530 570 520 550 ...

Page 21: ...K COVER ASSY 410 4811V00019A BRACKET ASSY ABS STAND 420 4950V00081B METAL HINGE FIXER SUS304 430 3550V00202A COVER A V ABS 520 6871VMM644J PWB ASSY MAIN 530 6871VSM814E PWB ASSY MF002A MX LE LT LL 540 6871VSMA74A PWB ASSY MF 002A CTL ASSY RE RL RN 550 6871VSM812F PWB ASSY MF002A TUNER 560 6871VSMA75A PWB ASSY MF 002A POWER ASSY RE RL R 570 6633VA0003D INVERTER ASSEMBLY 15VOLT KUBNKM022AVOLT 850VOL...

Page 22: ...08 IC509 IC801 IC809 IC850 IC851 IC852 IC854 IC901 IC902 IC903 IC904 IC905 L1 L2 IC506 IC802 IC803 IC806 IC807 IC808 Q50 Q90 Q101 Q103 Q105 Q107 Q201 Q202 Q203 0IZZVC0019C 0IAL241610B 0ISO204000A 0IFA752700A 0ISA721700C 0IIT323000D 0IKE780900H 0IHY100100A 0ISM941000A 0ISO210100B 0ISH092100B 0ITI808300B 0IMR882840B 0ISS416162B 0IKE702700D 0ICTMMO003A 0IKE703300E 0ITC786000A 0IKE781200P 0ISH092100B ...

Page 23: ...L TP5 470UF KME 16V M FL TP5 220UF KME 25V M FL TP5 220UF KME 25V M FL TP5 LOCA NO PART NO DESCRIPTION C814 C816 C819 C820 C826 C827 C828 C871 C872 C880 C881 C882 C904 C908 C909 C910 C914 C916 C922 C926 C927 C928 C930 C935 C936 C937 C938 C940 C943 C944 C945 C951 C954 C955 C959 C960 C1101 C1102 MJ201 PJ801 PJ802 DJ201 EJ201 SJ201 P1101 P1102 P1103 0CE475DK618 0CE107DH618 0CE106DF618 0CE227DH618 0CE...

Page 24: ...6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001A 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001A 6210TCE001A 6210TCE001E 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210TCE001G 6210VC0004A 6210VC0004A 6210VC0004A 6210...

Page 25: ...RESONATOR CRYSTAL SX 1SMD SUNNY RADIAL 14 318MHZ RESONATOR CRYSTAL SX 1SMD SUNNY RADIAL 14 318MHZ RESONATOR CRYSTAL HC49U KJE RADIAL 18 432MHZ 30P MANUAL OWNERS UKR BZ03 LG RU EN 061M REMOTE CONTROLLER ADAPTER RF 100 220VVOLT 15VOLT REMOTE CONTROLLER RECEIVER 38 0KHZ TUNER TAFC Z140D LOCA NO PART NO DESCRIPTION MISCELLANEOUS For Capacitor Resistors the charactors at 2nd and 3rd digit in the P No m...

Page 26: ...H INPUT 4 CVBS 1 S VHS 2 RGB YCrCb 1 F B 1 CVBS OUTPUT Y Cr Cb OUTPUT IC1 MICOM TXT 6 0MHz POWER DC to DC Converter SI786 SI4808DY T801 30V 5V SCL SDA CVBS SIF IF AGC 5V 3 3V 33V Y U V 480P Y U V 480P 0 5 0 7 Y U V 4 2 2 4 2 2 Y U V Analog R G B H V Dual Audio AMP LA4282 L SPK R SPK R G B FB TEXT H V 2H CLK 5V 3 3V 3 3V 9V 3 3V 3 3V 5V FOR RESET IC 3 3V 3 3V 3 3V 8 0V 15V H sync H Sync SEP 3 3V 5 ...

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Page 28: ...PRINTED CIRCUIT BOARD MAIN TOP ...

Page 29: ...MAIN BOTTOM ...

Page 30: ...MX TOP MX BOTTOM SPEAKER TOP TUNER TOP TUNER BOTTOM CONTROL TOP CONTROL BOTTOM ...

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