LG UltraGear 34GL750 Service Manual Download Page 11

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LGE Internal Use Only

Only for training and service purposes

2. No Screen on

Replace FFCable

Module Back Light On?

Check IC601, IC602

Replace LED Driver IC

Check Panel Power 10V (L700)

Check IC700 Output 10V

Replace IC700 &

Recheck

Check Panel eDP AUX

P300 (#9, 10, 36, 37)

Check IC300, IC303

Repair Main B/D

Check FFC Cable for Damage or

Open Conductors

Check LED Driver Output

(P601, P602 - 1, 2, 5, 6)

Replace T-Con Board or Module

Check P201 (PIN No.69)

Replace G-SYNC Module

Check WLED_ENABLE High?

(IC601,IC602 27pin)

Replace G-SYNC Module

Summary of Contents for UltraGear 34GL750

Page 1: ...AL LM71C 34GL750 34GL750 BB Any reproduction duplication distribution including by way of email facsimile or other electronic means publication modification copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual The material covered by this prohibition includes...

Page 2: ...ctronics Inc All rights reserved Only training and service purposes CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 6 BLOCK DIAGRAM 7 EXPLODED VIEW 8 DISASSEMBLY 9 TROUBLE SHOOTING GUIDE 11 CONTENTS ...

Page 3: ...l 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 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 meta...

Page 4: ...ame Mode Input Close Hot Key Gamer1 Gamer2 FPS1 FPS2 RTS Reader Function Game Mode Aspect Ratio S E S On Screen Control 7 Power Code Length 1 00 0 04M Refer to Suf power cord table Weight 0 13kg 10 Color Black 8 Cable DisplayPort Length 1 5 0 05 M Weight 0 095kg 10 Color Black Impedance 1 Cable 100Ω 5Ω 2 Connector 100Ω 5Ω HDMI Length 1 5 0 05 M Weight 0 0887kg 10 Color Black Impedance 1 Cable 100Ω...

Page 5: ...91 493 1330 1280 48 32 80 1280 x 720 V Lines 119 912 763 720 3 5 35 7 H Pixels 187 25 130 035 1440 1280 160 112 248 1280x1024 V Lines 119 958 1066 1024 1 3 38 8 H Pixels 174 50 83 894 2080 1920 48 32 80 1920x1080 V Lines 74 973 1119 1080 3 5 31 9 H Pixels 235 50 113 221 2080 1920 48 32 80 1920x1080 V Lines 99 930 1133 1080 3 5 45 10 H Pixels 285 50 137 26 2080 1920 48 32 80 1920x1080 V Lines 119 9...

Page 6: ...Tx Rx LED Driver IC LED Driver IC UART B L L ED CTRL_R I2C US B3 0 DN Q C B L CTRL B L L ED CTRL_L J o y stick Control M NT BTN E E P ROM P anel data S N HDCP u s er setting EE_I2C I2S FPGA_I2C E E_I2C I 2 C LV SHT I2C_ CTL H D MI_DDC FP G A_I2C I2C Key0 key1 ADC US B3 0 UP S E L2 D P HDMI SEL I2C I2C A UX _I2C I2C UART DP T ransmitter e DP Upper S l a ve HBR1 A UX _I2C L VD S S e rial F l ash 8Mb...

Page 7: ...nical parts in this chassis have special safety related characteristics These parts are identified by in the EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE ...

Page 8: ...y Separation 1 Put a product on a curved packing 2 Pull a button and disassemble a stand 3 Using a screw Driver remove screws 4ea 3 Back cover Assembly 1 Using plastic jig disassemble a back cover Sequence is like a below Detail method Bottom corner Bottom corner Put a jig at the corner Using thumb pull a jig upwards The thumb make it easy the principles of the lever Push a back cover ...

Page 9: ... jig into the center Put a jig at the top corner Pull a jig into the center Other hands push up a backcover 2 After Back Cover separation disassemble LED Cable and eDP Cable 3 Disassemble screws 2ea Module Rear shield 4 Disassemble Control PCB Ass y Latch Type 34UC98 88 model is common structure 5 Disassemble screws 10ea Module Cabinet Side Side Side Bottom Bottom Top Push a latch rib ...

Page 10: ...r Replace X100 N Check C701 Voltage Level 19V Check Power connector OK Replace Adapter Y N Y Check IC703 Output Voltage Level 3 3V Replace IC703 Recheck Y N Check X100 Clock 27MHz Check IC701 702 Output Voltage Level 5V Replace IC701 702 Recheck N Y Replace IC107 Flash Memory Y Y Check IC705 Output Voltage Level 2 5V 1 2V Replace IC705 Recheck N ...

Page 11: ... Driver IC Y N N Check Panel Power 10V L700 Check IC700 Output 10V Replace IC700 Recheck Y N Check Panel eDP AUX P300 9 10 36 37 Check IC300 IC303 Repair Main B D Y N Check FFC Cable for Damage or Open Conductors Check LED Driver Output P601 P602 1 2 5 6 Replace T Con Board or Module Y Check P201 PIN No 69 Replace G SYNC Module N Check WLED_ENABLE High IC601 IC602 27pin Y Replace G SYNC Module N ...

Page 12: ...Replace the G SYNC Module Check input signal format Is it supported Check JK102 for proper connection or Damage Replace the Connector N Y Check HDMI Cable for Damage or Open Connector Y Check I2C Signal EDID Replace the IC100 N Y Check IC102 AUX Signal J1 H1 Replace the IC102 N Y Check IC103 AUX Signal 3 4 Replace the IC103 N Y Y ...

Page 13: ...urposes 4 No Video DP Replace the G SYNC Module Check input signal format Is it supported Check JK101 for proper connection or Damage Replace the Connector N Y Check DP Cable for Damage or Open Connector Y Check IC101 AUX Signal 29 30 Replace the IC101 N Y Y Check IC103 AUX Signal 3 4 Replace the IC103 N Y ...

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