User manual LG 42PC35-ZC SERVICE MANUAL

[. . . ] Internal Use Only website:http://biz. LGservice. com PLASMA TV SERVICE MANUAL CHASSIS : PD73A MODEL : 42PC35 42PC35-ZC CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. CONTENTS SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ADJUSTMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 TROUBLE SHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 REPLACEMENT PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 SCHEMATIC DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PRINTED CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Copyright©2007 LG Electronics. Only for training and service purposes -2- LGE Internal Use Only SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Schematic Diagram and Replacement Parts List. [. . . ] Check the St-by 5V signal circuit. Does the high tension output appear? No Does the VSC signal Vs-ON appear?Check the Vs, Va voltage output circuit. Does the VSC low pressure output appear?Check the VSC Vs-ON signal Does the high tension output voltage occur?Yes No When the Y, Z B/D Module input connector, does Power Board high tension output voltage drop? No When removing the Y B/D Module input connector, does output voltage drop?Check the Z B/D Module output circuit No When removing the Z B/D Module input connector, does output voltage drop? Yes 9. Check the Y B/D Module output circuit Manufacture's model passage Copyright©2007 LG Electronics. Only for training and service purposes - 19 - LGE Internal Use Only 1-2. 42" Power Board Structure(EAY32808901) (1) Pin Layout (2) Pin Spec AC INLET NO 1 2 3 4 5 6 7 8 9 10 11 12 13 Wafer P/N CN1 AC NC AC ANALOG & DIGITAL BOARD P1 AC Det RL-ON STB 5V GND Vs-ON 5V Det M5V-ON STB 5V GND NC 6V GND 3. 4V-ON SMW250-013P SMW250-13P SMW250-10P SMW250-12P YH396-08V YH396-09V YH396-04V SMW250-08P P2 19V 19V GND GND 6V GND 3. 4V GND 12V GND P3 3. 4V 3. 4V GND GND 6V 6V GND GND 12V 12V GND GND PDP MODULE P11 Vs Vs NC GND GND Va GND 5V P12 5V GND Va GND GND GND NC Vs Vs P21 5V 5V GND GND READY P22 GND GND GND GND 5V 5V 5V 5V Copyright©2007 LG Electronics. Only for training and service purposes - 20 - LGE Internal Use Only 2. 2) Non does not come into the front LED. (2) Procedure check No Is the power cord plugged in?Plug in the power cord. Is the Line Filter and Power Board Cable connected?Yes No Replace the Fuse. Is the Power Board and 13P of VSC Board Cable connected?Yes No Connect the Cable. After removing the cables, connect them to the Power Board(except the SC101 connection cable), and change the AC voltage marking to manual. When ST-BY 5V does not operate, replace the Power Board. Copyright©2007 LG Electronics. Only for training and service purposes - 21 - LGE Internal Use Only 3. Protect Mode (1) Symptom 1) After lighting up once, it does not discharge minutely from module. 2) The rely falls. (there is an audible "click") 3) The color of the front LED turns from green to red. (2) Procedure check Is the Power Board normal ?For normal operation, corresponding COF failure means the module should be relaced. No Is the output voltage normal after removing P900, P901 of VSC Board?Yes If it operates normally after removing the P900, P901 : Replace the VSC Board No Is the output voltage normal after removing P1, 2, 4, 9, 10 connectors of the Ctrl-B/D?No Is the output voltage normal after removing P1, 2, 3, 4, 5 connectors of the X-B/D?Yes If the output voltage is normal after removing the P1, P2, P3 : Replace the right X-B/D If the output voltage is normal after removing the P4, P5 : Replace the left X-B/D No Is the appropriate Fuse (FS1, FS2) on Z-B/D? [. . . ] SCART &AV JACK GND TP1200 P_3. 3V 14. AV SWITCH SCART1_VIN JP1230 TP1213 TP1258 22 READY ZD1206 30V CDS3C30GTH GND 21 VIN 20 VOUT 19 GND 18 GND 17 S_FB 16 R 15 . 14 JP1205 JP1204 TP1201 ZD1227 30V TV_VOUT TP1262 TP1259 TP1203 GND READY CDS3C30GTH R1201 0 R1275 0 1/10W 5% 22 GND 21 VIN 20 R1200 470K R1203 C1242 OPT READY JP1214 TP1214 JP1206 TP1202 TP1249 C1241 OPT READY CDS3C30GTH R1224 1K C 75 R1271 1K C R1274 75 R1202 68 SCART2_VIN +9V_MSP4450 C1232 100uF 16V C1247 100uF 16V 75 R1214 R1270 1K R1259 1K B E Q1204 2SC3875S JP1208 B E VOUT 19 R1230 75 DTV/MNT_VOUT TP1435 L1412 HB-1M2012-800JT ZD1218 30V TP1204 JP1203 C1210 220pF GND 13 . 10 TP1215 R1244 75 R1242 JP1209 30V CDS3C30GTH ZD1219 TP1271 L1219 3. 3uH . 16 CIN 15 JP1212 C1215 330pF SCL_5V 30V ZD1226 CDS3C30GTH R1402 100 C1452 15pF 50V 75 R1229 75 R1239 0 TP1437 TP1244 . [. . . ]