LG 55LH40 Service Manual Download Page 24 | Manualshive

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LGE Internal Use Only

Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes

• AUDIO PATH

AUDIO TROUBLESHOOTING

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Summary of Contents for 55LH40

Page 1: ... READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LA92B MODEL 55LH55 55LH55 UA North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO MFL58436010 0904 REV00 ...

Page 2: ...right LG Electronics Inc All right reserved Only for training and service purposes 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 14 TROUBLE SHOOTING 18 BLOCK DIAGRAM 29 EXPLODED VIEW 34 SVC SHEET ...

Page 3: ...heck 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 position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed metallic part has a return path to...

Page 4: ...n your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge b...

Page 5: ...e 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 the replaced...

Page 6: ...tes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL CSA IEC specification CE EMC FCC ICES IEC specification CE No Item Specification Remark 1 Receiving System ATSC NTSC M 2 Aspect Ratio 16 9 3 LCD Module LC370WUF SBM1 With Inverter FHD Trumotion 240Hz 37LH55 UA LC420WUF SBM1 Without Inverter FHD Trumotion 240Hz 42LH55 UA LC47...

Page 7: ...gy Saving Off 100 Test Condition Minimum 65 75 85 Full white pattern Medium 43 53 63 Maximum 17 27 37 Screen Off 15 10 OPC Black luminance 75 150 Gray Input Test Condition difference of OPC white No Luminance Vivid mode 4 window white pattern on off mode difference 255 Gray Input Case white black No Luminance difference 11 Dielectric Voltage GND 1500 V min at 100mA 1 5KV IEC60065 SIGNAL 3000 V min...

Page 8: ...of central white window and mark peak brightness in max brightness degree measure the same condition in video signal RGB signal Luminance uniformity measure specification 1 Impress 100 255Gray Level full white pattern at the same peak brightness measurement 2 Measure average brightness in 5 points Signal Picture Mode Dynamic Contrast Dynamic Color Black Level OPC RF NTSC M Vivid High High Low Off ...

Page 9: ...generally simple test measurement The Correct measure specification is followed by IEC61988 2 CD JAPAN EIAJ 2710 9 LGE Internal Use Only Copyright LG Electronics Inc All right reserved Only for training and service purposes A H 4mm B V 4mm H V Active Area 8 Component Video Input Y CB PB CR PR No Specification Remark Resolution H freq kHz V freq Hz Pixel Clock MHz 1 720 480 15 73 60 13 5135 SDTV DV...

Page 10: ...0 09 25 17 EGA 2 720 400 31 469 70 08 28 32 DOS 3 640 480 31 469 59 94 25 17 VESA VGA 4 800 600 37 879 60 31 40 00 VESA SVGA 5 1024 768 48 363 60 00 65 00 VESA XGA 6 1280 768 47 776 59 870 79 5 CVT WXGA 7 1360 768 47 712 60 015 85 50 VESA WXGA 8 1280 1024 63 981 60 020 108 00 VESA SXGA 9 1600 1200 75 00 60 00 162 VESA UXGA 10 1920 1080 67 5 60 148 5 HDTV 1080P 10 2 DTV Mode No Resolution H freq kH...

Page 11: ...FF FF FF FF 00 1E 6D 02 00 01 01 01 01 10 01 13 01 03 68 73 41 78 0A CF 74 A3 57 4C B0 23 20 09 48 4C A1 08 00 A9 40 81 80 61 40 45 40 31 40 30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20 50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 39 60 3F 1F 52 10 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 00 36 0 1 ...

Page 12: ...02 20 3A 80 18 71 38 2D 40 58 2C 04 05 7E 8A 42 00 00 30 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 7E 8A 42 40 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 7E 50 8A 42 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 60 00 7E 8A 42 00 00 18 26 36 80 A0 70 38 1F 40 30 70 20 25 00 7E 8A 42 00 00 1A 00 00 00 00 00 00 BA 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 02 03 1F F1 47 10 22 20 05 84 03 02 26 15 07 50 10 09 07 ...

Page 13: ... V Wide Range PSU 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 02 03 1F F1 47 10 22 20 05 84 03 02 26 15 07 50 10 09 07 07 67 03 0C 00 40 00 B8 2D E3 05 03 01 02 20 3A 80 18 71 38 2D 40 58 2C 04 05 7E 8A 42 00 00 30 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 7E 8A 42 40 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 7E 50 8A 42 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96 60 00 7E 8A 42 00 00 18 26 36 80 A0 70 38 1F ...

Page 14: ...he circumstance of above 15 C for 3 hours Caution When still image is displayed for a period of 20 minutes or longer especially where W B scale is strong Digital pattern 13ch and or Cross hatch pattern 09ch there can some afterimage in the black level area 3 Main PCB check process APC After Manual Insert executing APC 3 1 Boot file Download 1 Execute ISP program Mstar ISP Utility and then click Co...

Page 15: ...tting In Stop 4 3 Etc Ship out mode Service Option Default USB Download S W Update Option 5 Board level adjustment 5 1 ADC adjustment 5 1 1 Overview ADC adjustment is needed to find the optimum black level and gain in Analog to Digital device and to compensate RGB deviation 5 1 2 Equipment Condition 1 Jig RS 232C protocol 2 Input MSPG 925FS Model 209 Pattern 65 Only component 3 RGB Adjust use inte...

Page 16: ...Set TV in adj mode using POWER On Key 2 Press ADJ key Æ EZ adjust using adj R C 3 Using CH KEY select 7 TEST PATTERN then press Enter to place inHEAT RUN mode and wait for 5 minutes 4 Zero calibrate the probe of Color Analyzer then place iton the center of LCD module within 10 cm of the surface 5 Press ADJ key Æ 6 White Balance then press the cursor to the right KEY When is pressed Full White inte...

Page 17: ...increases from 0 If change is not seen replace Eye Q II sensor step 2 step 3 step 4 step 5 step 6 7 GND and Internal Pressure check 7 1 Method 1 GND Internal Pressure auto check preparation Check that Power Cord is fully inserted to the set If loose re insert 2 Perform GND Internal Pressure auto check Unit w fully inserted power cord and A V arrives to the auto check process Connect D terminal AV ...

Page 18: ...RGB H V Half NIM Tuner MAX3232 Saturn5 Saturn5 ATSC US ATSC US LGE3159 MPEG2 Linux Scaler IF SIF TU_CVBS Reset IF_AGC SDA SCL_5V HDMI4 HDMI 2 RX TX RX TX REAR REAR JACK PACK JACK PACK TR Buffer VSB Demod TS In 0 7 TS_clk SOP Val EEPROM AV Compone nt 1 Y Pb Pr L R CVBS Y C L R Compone nt 2 Y Pb Pr L R SCL SDA_3 3V LCD Module FHD 120Hz FHD Trumotion240Hz FRC IC LGE7329 DDR2 Qimonda Hynix FRC Block F...

Page 19: ...on 1 A changeof Brightness means Backlight dimming is operating by dark imagebecause of OPCfunction 2 A phenomenon of flicker a specially bright areais Sideeffect becauseof OPC function Recheck After OPC Off YES Ex1 A change of total brightness adding local bright image or caption In excluding a caption In including a caption Ex2 A phenomenon of moment flicker a specially bright area after changin...

Page 20: ...cause Main chip L GE3159 have some troubles After checking thoroughly all path once again You should decide to replace LGE3159 or n Check all power domain of LGE7329 IC801 3 3V 1 9V_CORE 1 26V crystal output X800 12MHz FRC_RESET Measure Power waveform at L800 L801 L802 L803 L804 L806 because it s more easy to check Can you see the normal waveform YES This board has big problem because FRC chip LGE...

Page 21: ... all power domain of LGE7329 IC801 3 3V 1 9V_CORE 1 26V crystal output X800 12MHz FRC_RESET Measure Power waveform at L800 L801 L802 L803 L804 L806 because it s more easy to check Can you see the normal waveform This board has big problem because FRC chip LGE7329 have some troubles After checking thoroughly all path once again You should decide to replace LGE7329 Although you replace it you cannot...

Page 22: ...r domain of LGE7329 IC801 3 3V 1 9V_CORE 1 26V crystal output X800 12MHz FRC_RESET Measure Power waveform at L800 L801 L802 L803 L804 L806 because it s more easy to check Can you see the normal waveform This board has big problem because FRC chip LGE7329 have some troubles After checking thoroughly all path once again You should decide to replace LGE7329 Although you replace it you cannot see norm...

Page 23: ...Power of this chip you should decide to replace this or not YES YES YES NO NO NO NO YES YES Check all power domain of LGE7329 IC801 3 3V 1 9V_CORE 1 26V crystal output X800 12MHz FRC_RESET Measure Power waveform at L800 L801 L802 L803 L804 L806 because it s more easy to check Can you see the normal waveform This board has big problem because FRC chip LGE7329 have some troubles After checking thoro...

Page 24: ... 24 LGE Internal Use Only Copyright LG Electronics Inc All right reserved Only for training and service purposes AUDIO PATH AUDIO TROUBLESHOOTING ...

Page 25: ... should decide to replace item or not 2 AV Component RGB PC Check JK1206 JK1202 JK1205 Can you see the normal waveform NO JK701 JK707 JK700 JK702 JK703 may have problem Replace this Jack Check the input PinAA3 Y1 AE1 AF3 AE3 AE2 AA1 AB1 AB2 AC2 AB3 AC3 of LGE3159 IC100 Can you see the normal waveform NO YES After checking audio signal line you should decide to replace item or not YES Check the Out...

Page 26: ...YES YES NO NO NO NO After checking the Power Select Pin Etc of this chip you should decide to replace this or not Check DDC communication lines IC502 Check the output of TDA9996HL IC502 _HDMI1 2 3 or HDMI4 Can you see the normal waveform Check HDCP communication lines IC105 YES Check the Output Pin Audio_MASTER_CLK MS_LRCK MS_SCK MS_LRCH of LGE3159 IC100 Can you see the normal waveform Check IC600...

Page 27: ... has big problem because Main chip BCM3553 have some troubles After checking thoroughly all path once again You should decide to replace BCM3553 or not After checking audio signal line you should decide to replace item or not YES NO After checking the Power I2C Reset of this chip you should decide to replace this or not NO YES After checking audio signal line you should decide to replace item or n...

Page 28: ... to check Can you see the normal signal Check the input of JK601 Can you see the normal waveform YES NO NO This board has big problem because Main chip LGE3159 have some troubles After checking thoroughly all path once again You should decide to replace LGE3159 or not After checking audio signal line you should decide to replace item or not YES After checking the Jack you should decide to replace ...

Page 29: ...phone Data 0 7 IF SIF TU_CVBS Reset IF_AGC SDA SCL_5V JTAG CLK TDI TDO MS RST HDMI4 Addr 0 1 CS Audio L R Audio L R for RGB HDMI 2 SPDIF RX TX RX TX REAR REAR JACK PACK JACK PACK SCL SDA_3 3V TR Buffer VSB Demod X tal Reset Switch Reset IC 12MH z TS In 0 7 TS_clk SOP Val EEPROM Data 16 31 DDR2 512Mbit Qimonda Hynix AV Component 1 Y Pb Pr L R CVBS Y C L R Component 2 Y Pb Pr L R Digital Audio Coaxi...

Page 30: ... LGE7329 FRC LGDT3305 SDA_0 SCL_0 MEMC_SDA MEMC_SCL SDA_1 SCL_1 SDA_SUB AMP SCL_SUB AMP FE_DEMOD_SDA FE_DEMOD_SCL 5V_GENERAL TUNER FE_TUNER_SDA FE_TUNER_SCL 5V_TU OPTION AT24C512 EEPROM_SDA EEPROM_SCL 3 3V LGE3159 ISP_RXD ISP_TXD 5V_ST TDA9996HL TDA9996_SDA TDA9996_SCL CAT24WC08 HDCP HDMI_SDA HDMI_SCL 3 3V_HDMI Saturn 5 ISP Debug Port TDA9996HL I2C Map ...

Page 31: ...N POWER_ON OFF POWER_ON_DELA Y EN Module Tcon 24V PSU 20V Lips L602 24V_AMP PSU 20V_AMP Lips NTP3100L SSM6N15FU 3 3V_ST 5V L709 5V_GENERAL MP2212 12V MP2212 EN 5V_EXT SC156515 SC4215 3 3V_PVSB 1 2V_PVSB 3 3V_AVDD_PVSB 3 3V_DVDD_PVSB 1 2V_DVDD_PVSB LGDT3305 3 3V NTP3100L AZ1117 1 8V_AMP NTP3100L SC4215 1 8V_DDR 1 8V_S_DDR MSD3158 HYB18TC512160B2F MX25L3205 MP2212 1 26V_VDDC L711 L717 IC705 MSD3158v...

Page 32: ...D_MEMPLL AVDD_LPLL AVDD_DM AVDD_OTG 3 3V_VDDP 3 3V SC4215 1 8V_DDR L101 Saturn5 LGE3159 Saturn5 LGE3159 L715 L703 L709 L711 L109 L103 L106 L108 L107 L102 W7 AVDD_AU J7 N7 AVDD_33_1 5 H17 T20 V20 AVDD_MEMPLL R20 AVDD_LPLL W8 AVDD_DM H8 AVDD_USB H9 W10 VDDP_1 8 G12 W18 AVDD_DDR_1 11 D16 Y22 VDDC_1 27 H7 AVDD_MPLL EN EN Main IC POWER MANAGEMENT D4 HWRESET L717 IC702 IC103 IC704 IC705 IC701 IC100 SI49...

Page 33: ... 1 8V_MEMC MP2305DS 3 3V Ursa1 LGE7329 Ursa1 LGE7329 L715 FRC IC POWER MANAGEMENT APE8953 1 26V_MEMC L714 3 3V_MEMC EN MSD3158 M11 RESET 3 3V_ST K6 J11 AVDD_DDR1 7 L9 AVDD_MEMPLL E5 H6 VDDC_1 5 L803 L800 MEMC_RESET R248 100 IC707 IC704 IC708 IC100 IC801 12V MP2212 EN IC706 5V_EXT SI4925 EN Q706 POWER_ON OFF POWER_ON_DELAY EN L709 5V_GENERAL EN 5V_ST ...

Page 34: ...cal and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer ...

Page 35: ...24 0 1 u F C2131 0 1 u F C183 0 1 u F C2104 0 1 u F C2127 0 1 u F C2126 0 1 u F C2119 OPC_EN L104 0 1 u F C100 22 R183 22 R184 0 R223 OPT 5V_HDMI_4 22 R269 OPT POWER_DET OPT R274 SB_MUTE PANEL_CTL POWER_DET INV_CTL POWER_ON OFF DBG_RX 0 R215 0 R216 0 R217 0 R218 0 R239 0 R240 0 R202 0 R203 3 3K R131 0 OPT R2113 0 OPT R2114 0 OPT R284 4 7K R2106 OPT 4 7K R197 OPT 1 2K R2108 1 2K R2107 0 OPT R285 0 ...

Page 36: ... r O p t i c JST1223 001 JK601 1 GND 2 VCC 3 VINPUT 4 FIX_POLE 1K R638 SPDIF_OUT 001 W29 ADMC5M03200L_AMODIODE 5 6V D1211 ZENER ADMC5M03200L_AMODIODE 5 6V D1212 ZENER ADMC5M03200L_AMODIODE 5 6V D1213 ZENER ADMC5M03200L_AMODIODE 5 6V D1214 ZENER ADMC5M03200L_AMODIODE 5 6V D1220 ADMC5M03200L_AMODIODE 5 6V D1221 ADMC5M03200L_AMODIODE 5 6V OPT D1222 ADMC5M03200L_AMODIODE 5 6V OPT D1224 ADMC5M03200L_AM...

Page 37: ...05 AM12 3 3V_ST 0 R572 0 R525 GND 0 R524 1K R521 OPT 0 R599 D2 _HDMI4 005 AF20 D0 _HDMI4 005 AG20 AVRL161A1R1NT VR506 OPT 0 R598 0 R593 CK _HDMI4 005 AH20 JP507 CK _HDMI4 005 AH20 1K R1506 OPT D0 _HDMI4 005 AG20 3 6K R518 OPT 0 R596 D2 _HDMI4 005 AF20 CEC_REMOTE 005 H8 005 H26 005 H17 005 L27 005 AM11 D1 _HDMI4 005 AF20 DDC_SCL_4 005 AH20 005 AM25 47K OPT R1507 0 R523 D1 _HDMI4 005 AG20 0 1 u F 16...

Page 38: ...u F 50V C613 22000pF 50V C623 0 0 1 u F 50V C642 0 0 1 u F 50V C641 100 R601 5 6 R614 22000pF 50V C624 MS_LRCH 001 W26 SPK_R 006 AJ18 4 7K R618 0 R610 0 1 u F 50V C635 10K R612 1 8V_AMP 24V_AMP 120 ohm L610 22000pF 50V C618 DA 8580 EAP38319001 L606 2S 1S 1F 2F MLB 201209 0120P N2 L604 WAFER ANGLE P600 1 SPK_R 2 SPK_R 3 SPK_L 4 SPK_L 3 3 R621 33pF 50V C609 SPK_L 006 AH11 1 8V_AMP 3 3 R623 33pF 50V ...

Page 39: ...78 10uF 6 3V C754 OPT C766 BLM18PG121SN1D L719 CB3216PA501E L724 47K R739 47K R740 10K OPT R721 10K R720 3 3V_ST 0 R713 10K OPT R753 2SC3875S ALY OPT Q708 E B C INV_CTL 001 AR31 BLM18PG121SN1D L717 0 R771 0 OPT R773 RL_ON 001 AR32 10K R733 OPT 22uF 16V C732 22uF C733 OPT 1N4148W_DIODES 100V D700 OPT 1 10W 56K 1 R770 1 10W 18K 1 R769 NR8040T3R6N 3 6uH L710 BLM18PG121SN1D L720 GND 47 R737 10nF 50V C...

Page 40: ...2 220nH L1012 I F _ C o i l 20K R1011 SC4215ISTRT IC1000 3 VIN 2 EN 4 NC_2 1 NC_1 5 NC_3 6 VO 7 ADJ 8 GND 100uF 16V C1019 1 2V_PVSB 0 1 u F 50V C1022 10K R1012 5V_EXT MLB 201209 0120P N2 L1013 0 R1003 ISA1530AC1 Q1000 E B C ISA1530AC1 Q1001 E B C OPT C1074 OPT C1075 100 R1030 OPT POWER_EN 001 AR30 007 AH18 1uF 16V C1010 CB3216PA501E L1009 0 1 u F 50V C1016 47uF 16V C1039 0 1 u F 16V C1037 OPT AS78...

Page 41: ...3 A5 K8 CK R3 NC5 L3 BA1 J 7 VSSDL L7 CAS F2 VSSQ4 B3 U D M M2 A10 AP K2 CKE R7 NC6 M7 A2 N7 A6 M8 A0 J 1 VDDL K3 W E E8 LDQS P7 A11 K9 ODT A2 NC1 N2 A3 P2 A7 H8 VSSQ1 F7 LDQS A8 UDQS R2 A12 L8 CS E2 NC2 E7 VSSQ5 D8 VSSQ6 D2 VSSQ7 A7 VSSQ8 B8 VSSQ9 B2 VSSQ10 P9 VSS1 N1 VSS2 J 3 VSS3 E3 VSS4 A3 VSS5 G9 VDDQ1 G7 VDDQ2 G3 VDDQ3 G1 VDDQ4 E9 VDDQ5 C9 VDDQ6 C7 VDDQ7 C3 VDDQ8 C1 VDDQ9 A9 VDDQ10 R1 VDD1 M...

Page 42: ...R 8 R5 MADR 11 P5 WEZ T6 BADR 1 R6 BADR 0 P6 MADR 1 T7 MADR 10 L11 AVDD_DDR_7 R7 MADR 5 P7 MADR 9 T8 MADR 12 R8 MADR 7 P8 MADR 3 N8 MCLKE K10 GND_16 F7 VDDC_3 T9 MDATA 4 R9 MDATA 3 K7 GND_13 P9 MDATA 1 T10 MDATA 6 K11 AVDD_DDR_3 R10 MDATA 11 P10 MDATA 12 T11 MDATA 9 R11 MDATA 14 J 1 1 AVDD_DDR_1 P11 DQM 1 T12 DQM 0 R12 DQS 0 P12 DQSB 0 H11 VDDP_1 T13 DQS 1 R13 DQSB 1 P13 MDATA 15 T14 MDATA 8 R14 M...

Page 43: ... CAS F2 VSSQ4 B3 U D M M2 A10 AP K2 CKE R7 NC6 M7 A2 N7 A6 M8 A0 J 1 VDDL K3 W E E8 LDQS P7 A11 K9 ODT A2 NC1 N2 A3 P2 A7 H8 VSSQ1 F7 LDQS A8 UDQS R2 A12 L8 CS E2 NC2 E7 VSSQ5 D8 VSSQ6 D2 VSSQ7 A7 VSSQ8 B8 VSSQ9 B2 VSSQ10 P9 VSS1 N1 VSS2 J 3 VSS3 E3 VSS4 A3 VSS5 G9 VDDQ1 G7 VDDQ2 G3 VDDQ3 G1 VDDQ4 E9 VDDQ5 C9 VDDQ6 C7 VDDQ7 C3 VDDQ8 C1 VDDQ9 A9 VDDQ10 R1 VDD1 M9 VDD2 J 9 VDD3 E1 VDD4 A1 VDD5 B9 DQ...

Page 44: ...ND 8 WARM_ST 9 IR 10 GND 11 3 3V_ST 12 PWR_ON 13 GND 10uF 10V C1245 100 R1231 OPT USB DOWN STREAM KJA UB 4 0004 JK1204 1 2 3 4 5 5V_USB_1 0 0 1 I 2 5V_USB_1 0 0 1 I 2 ENKMC2838 T112 D1204 A1 C A2 0 R1220 0 R1221 LED_MOVING LED_R 001 AR32 0 R1222 LED_B 001 AR32 THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X RADIATION FILRE AND ELECTRICAL SHOC...

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