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Copyright © 2011 LG Electronics Inc. All rights reserved.
Only for training and service purposes

LGE Internal Use Only

Check video output

Follow procedure All source audio trouble 

shooting  

Y

Follow procedure digital TV video 

trouble shooting

N

N

Replace Mstar IC (IC1)

Digital TV Audio

Trouble Shooting Guide

Содержание 42PT330

Страница 1: ...Y PRECAUTIONS IN THIS MANUAL CHASSIS PU14K MODEL 42PT330 350 350C 42PT330 UB 42PT350 UD 42PT350C UD 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 MFL67002603 1106 REV01 ...

Страница 2: ... Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 7 BLOCK DIAGRAM 12 EXPLODED VIEW 13 CIRCUIT DIAGRAM ...

Страница 3: ...t s Neck 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 met...

Страница 4: ...Humidity 65 10 3 Power Voltage Standard input voltage 100 V 240 V 50 60Hz Standard Voltage of each product is marked by models 4 Specification and performance of each parts are followed each drawing and specification by part number in accordance with BOM 5 The receiver must be operated for about 5 minutes prior to the adjustment DQA Request 3 Test Method 1 Performance LGE TV test method followed 2...

Страница 5: ...TV 01 135 3 Input Voltage 1 AC 100 V 240 V 50 60Hz 2 AC 100 V 120 V 50 60Hz 4 Market NORTH AMERICA 5 Screen Size 106 cm 42 inch Wide 1024 768 42T3N 127 cm 50 inch Wide 1024 768 50T3N 127 cm 50 inch Wide 1920 1080 50R3 152 cm 60 inch Wide 1920 1080 60R3 6 Aspect Ratio 16 9 7 Tuning System FS 8 PDP Module PDP42T3 1024 768 PDP50T3 1024 768 PDP50R3 1920 1080 PDP60R3 1920 1080 9 Operating Environment 1...

Страница 6: ...dness R G B 100IRE 255Gray Blue X Unlimitedness 0 150 0 158 100 Window White Pattern Y Unlimitedness 0 065 0 075 Picture Vivid Medium 100 Window 85IRE 100 Window White 2 Color coordinate uniformity 0 020 average 0 020 Pattern Picture Vivid Medium 3 Color Cool 0 261 0 276 0 291 White 85IRE 216Gray 100 Temperature 0 268 0 283 0 298 Window White Pattern Medium 0 270 0 285 0 300 100 Window 0 278 0 293...

Страница 7: ...Press the ADJ KEY on R C and enter EZ ADJUST Select 4 WHITE PATTERN by using D E CH and select White by using F G VOL Set is activated HEAT run without signal generator in this mode Single color pattern RED BLUE GREEN of HEAT RUN MODE uses to check panel Caution If you turn on a still screen more than 20 minutes Especially digital pattern cross hatch pattern an after image may be occur in the blac...

Страница 8: ... M M 1EA 2 Connection Diagram for Measuring refer to fig 1 fig 1 Power PCB Assy Voltage adjustment 6 2 Adjustment method 1 Vs adjustment refer fig 1 1 Connect terminal of D M M to Vs pin of P812 42 P811 connect terminal to GND pin of P812 42 P811 2 After turning VR901 voltage of D M M adjustment as same as Vs voltage which on label of panel left top deviation 0 5V 2 Va adjustment refer fig 1 1 Aft...

Страница 9: ...lor temperature 8 2 Connecting Picture of the Measuring Instrument On Automatic control Inside PATTERN is used when W B is controlled Connect to auto controller or push control R C ADJ Key Enter the mode of White Balance the pattern will come out 9 LGE Internal Use Only Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes 0 003 0 003 0 003 PC for communicati...

Страница 10: ... WARM Control is carried out three times Temperature COOL R offset G offset B offset is set to 128 Control R Gain and G Gain Each gain is limited to 192 Temperature MEDIUM R offset G offset B offset is set to 128 Control R Gain and G Gain Each gain is limited to 192 Temperature WARM R offset G offset B offset is set to 128 Control G Gain and B Gain Each gain is limited to 192 9 HDCP SETTING Not ne...

Страница 11: ...sing IN STOP key by SVC remocon Red LED are blinked alternatively And then Automatically turn off Must not AC power OFF during blinking 12 4 Internal pressure Confirm whether is normal or not when between power board s ac block and GND is impacked on 1 5kV dc or 2 2kV dc for one second 13 Default Service option 13 1 ADC Set V R Gain adjustment Value default 128 V G Gain adjustment Value default 12...

Страница 12: ... 12 LGE Internal Use Only Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes BLOCK DIAGRAM ...

Страница 13: ... 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 IMPORTANT SAFETY NOTICE A10 A9 LV1 A12 A21 A2...

Страница 14: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 15: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 16: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 17: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 18: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 19: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 20: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 21: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Страница 22: ......

Страница 23: ...Copyright 2011 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only Startrek Trouble Shooting Guide PU14K ...

Страница 24: ...PDIF RX TX RX TX JACK PACK JACK PACK at REAR at REAR JACK PACK JACK PACK at SIDE at SIDE TR Buffer VSB Demod X tal Reset Switch Reset IC 12MHz TS In 0 7 TS_clk SOP Val EEPROM EEPROM EEPROM EEPROM AV Component 1 Y Pb Pr L R CVBS L R Component 2 Y Pb Pr L R LVDS PDP Module USB2 0 DivX DP DM O C Protector 5V 5V MPEG2 8051 Digital AMP TAS5707 I2S mute reset SCL SDA_3 3V DDR2 1Gbit Hynix Samsung EEPROM...

Страница 25: ... 2 1 2V_PVSB VSB IC DDR STBY FET Q303 Power_SW VSB_Ctrl 5V_MST AVDD_MPLL VDDP AVDD_MEMPLL AVDD_ADC AVDD_DM AVDD_OTG AVDD_AU AVDD_LPLL AVDD_33 AVDD_DDR 1 3V_VDDC AVDD_MLINK DDR1 8V 3 3V_PVSB 1 2V_DVDD 3 3V_DVDD 3 3V_AVDD USB MIC2009YM6 5V 5V_USB HDMI switch 5V AZ1117H 3 3V_TU Tuner 5V_TU_CVBS Audio AMP HDCP NVRAM Serial Flash 17V EEPROM RGB MAX3232 EEPROM HDMI L303 L315 IC302 L323 L9 L8 L7 L6 L5 L4...

Страница 26: ... TP AV2 L R COMP1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2...

Страница 27: ...y Check P301 All Voltage Level 16V 5V Check Power connector OK Replace Power board Y N Y Check C311 Voltage Level 5V Replace Q302 Y N Check IC303 pin2 Voltage Level 3 3V Replace IC303 Y N Check IC203 Flash Memory Check IC302 pin2 Output Voltage Level 3 3V Replace IC302 N Y Power Up Boot Fail Trouble Shooting Guide ...

Страница 28: ...OMP1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI ...

Страница 29: ...N Check GPIO Path of IC1 N Y Electrical Specifications Power Supply Sequence Input Signal Timing Specification Control Signal Register Check CAS It should satisfy the Pixel Clock on CAS No OSD Trouble Shooting Guide 26 35 7 28 Va OVP 24 38 5 26 Vs OVP 22 41 7 24 M5V OVP 20 45 5 22 17V OVP 18 50 0 20 5V OVP 16 55 6 18 Va UVP 14 62 5 16 Vs UVP 12 71 4 14 Vs OCP 10 83 3 12 M5V UVP 8 100 0 10 17V UVP ...

Страница 30: ... Check Signal X1 output N Y SCL continue SDA continue ACK By Slave 9 1 D0 D7 9 ACK By Slave Command Data for Addr Stop By Master D6 SCL 8 SDA 0 0 1 1 1 A7 W Start By Master Chip ID Address Byte 0x1C ACK By Slave 0 1 9 1 A6 A1 A0 Command Address Addr A 7 0 0 Write only Master VSC Image Board Slave PDP Module Sample Signal on C715 C717 SCL SDA ACK signal Check Low OK High Error Replace X1 N Check SM...

Страница 31: ...L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 Opt...

Страница 32: ...s Replace Tuner Y N Check Tuner Power IC306 2pin 3 3V IC307 2pin 1 8V Replace IC306 or IC307 Y N Y Replace Mstar IC1 has problems N Y Check LD401 color Bad Tuner Replace Tuner None Green Check Demodulator Input Clock X402 25MHz Replace it X402 N Y Check PDP Module Control board Refer to Module CAS Check P701 or P703 21 RA2 22 RA2 19 RB2 20 RB2 Digital TV Video Trouble Shooting Guide ...

Страница 33: ... L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 Op...

Страница 34: ... purposes LGE Internal Use Only Check RF Cable Check CVBS signal IC401 16 Pin Replace Tuner IC401 Y N Check Tuner Power IC306 2pin 3 3V IC307 2pin 1 8V Replace IC306 or IC307 Y N Y Replace Mstar IC1 CVBS waveform sample Defend on the input signal Analog TV Video Trouble Shooting Guide ...

Страница 35: ... L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 Op...

Страница 36: ... LGE Internal Use Only Check input signal format Is it supported Check signal C25 C26 C27 C44 C46 C47 Y Check the damage of JK609 And Replace Connector N Y Replace IC1 N Replace Mstar IC1 Y Check Component Cable Measured signals depend on the input signal Component Video Trouble Shooting Guide ...

Страница 37: ...MP1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3...

Страница 38: ... it supported Check signal Hsync Vsync R666 R667 Replace R645 R646 Check signal R58 R59 R60 Y Y N Check JK601 Replace connector JK601 Y N Y Replace R15 R17 R18 N Replace Mstar IC1 Y Check Signal C14 C16 C17 Replace C14 C16 C17 N Check RGB Cable conductors for damage Y Measured signals depend on the input signal RGB Video Trouble Shooting Guide ...

Страница 39: ...MP1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3...

Страница 40: ... signal format Is it supported Check signal R30 Rear AV Rear R29 Side AV Replace Resistor Y N Check AV port of JK609 Rear Check JK603 Side Replace or reseat connector Y N Y Replace Mstar IC1 Check AV Cable S Video Cable for damage or open conductors Y Measured signals depend on the input signal AV Video Trouble Shooting Guide ...

Страница 41: ...P1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 ...

Страница 42: ... supported Y Check JK501 JK502 JK503 for proper connection or damage Replace connector Y N Y Check HDMI Cable for damage or open conductors Check EDID EEPROM IC502 503 504 Power 8 I2C Signal 5 6 Replace Mstar IC1 N Check HDCP IC501 Power 8 I2C Signal 5 6 Replace IC502 503 504 Y N Replace IC501 Y N Check Mstar IC1 HDMI Video Trouble Shooting Guide ...

Страница 43: ...L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 Opt...

Страница 44: ...Replace L803 L804 Y N Check IC801 Power 16V L303 3 3V L801 L802 Check 16V P301 1 2 3 3V IC303 2 Y N Check Connector JK801 Check Mstar I2S Output R817 R818 R819 Y Replace IC1 N Check speaker for damage Y Check IC801 Status PDN 19 Reset 25 is High Check Reset R829 PDN R812 They must be High 3 3V N Replace JK801 N Replace the Speaker N Y Y All Source Audio Trouble Shooting Guide ...

Страница 45: ...L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 Opt...

Страница 46: ...ved Only for training and service purposes LGE Internal Use Only Check video output Follow procedure All source audio trouble shooting Y Follow procedure digital TV video trouble shooting N N Replace Mstar IC IC1 Digital TV Audio Trouble Shooting Guide ...

Страница 47: ... L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 Op...

Страница 48: ... procedure All source audio trouble shooting Y Follow procedure analog TV video trouble shooting N Replace Mstar IC IC1 Check IC401 pin38 for 3 3V Check IC306 output N Y Check SIF signal IC401 18 Replace IC401 N Y Check SIF signal C51 Check SIF line N Y SIF waveform sample Defend on the input signal Y Analog TV Audio Trouble Shooting Guide ...

Страница 49: ... RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 Optica...

Страница 50: ... RGB JK603 AV Side Replace connector or cable if found damaged N Y Check signal R619 R623 Component1 R606 R608 Component2 R637 R638 RGB R616 R618 AV Rear R633 R634 AV Side Replace the Resistor N Y Check IC1 signal C20 C21 C22 C23 C28 C29 C33 C34 C12 C13 Replace Capacitor N Y Follow procedure All source audio trouble shooting Component RGB AV Audio Trouble Shooting Guide ...

Страница 51: ...P1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 ...

Страница 52: ...eserved Only for training and service purposes LGE Internal Use Only Follow procedure All source audio trouble shooting Check EDID EEPROM IC502 503 504 Power 8 I2C Signal 5 6 Replace IC or re download EDID data Y N HDMI Audio Trouble Shooting Guide ...

Страница 53: ...1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3 O...

Страница 54: ...ghts reserved Only for training and service purposes LGE Internal Use Only Check Signal JK604 3 Check SPDIF signal R641 Replace Mstar IC Y N Y Replace JK604 SPDIF waveform sample Defend on the input signal Optical Audio Trouble Shooting Guide ...

Страница 55: ...MP1 L R RGB L R TP_IN1 AV1 AV2 AV1 AV2 24C512 24C512 AT NT VSB LGDT3305 VSB LGDT3305 LVDS Con HD FHD LVDS Con HD FHD AV1 L R GPIO I2S Mstar Saturn 4L of MPEG decoder RGB RGB HDMI1 COMP1 SPDIF Component 1 Analog RGB 3input SIF SIF Analog Audio 6input Analog Audio 3output SPI Flash 8MB Flash 8MB HDMI 1 12MHz 25MHz HDMI2 COMP2 Side HDMI COMP2 L R UART MAX3232 MAX3232 RS 232C Component 2 HDMI 2 HDMI 3...

Страница 56: ...2 0 Cable for damage or open conductors Check L703 voltage level 5V Y N Replace L703 Check JK702 Replace JK702 Y N Replace Mstar IC Y Exception USB power could be disabled by inrushing current In this case remove the device and try to reboot the TV AC power off on Check IC701 N Replace IC701 Y USB Audio Trouble Shooting Guide ...

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