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LGE Internal Use Only

Copyright ©

LG Electronics. Inc. All rights reserved.

Only for training and service purposes

3. Analog RF Video Trouble Shooting guide

Check TU3001 Pin7(Video output)

Can you see the normal signal?

Check tuner 5V power L3000

YES

NO

Could you measure voltage of TU3001 & IIC lines?

Are they all normal?

Check Mstar LVDS output

NO

You should check power line

& IIC lines.

YES

You should replace TUNER.

NO

Check IC5000

YES

YES

Check tuner 3.3V power L3001

Replace L3001

NO

Replace IC5000

Replace L3000

YES

NO

Check tuner 1.8V power L3003

Replace IC3000 or IC3000

NO

Check RF cable & signal

YES

NO

Replace Mstar(IC101)

or main board

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Содержание 49LX560H

Страница 1: ... MFL69175104 1612 REV02 CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL Internal Use Only CHASSIS LA5CJ LA5CG MODEL 49LX570H 560H MODEL 49LX570H 560H U ...

Страница 2: ...t LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 USB DOWNLOAD 8 TROUBLE SHOOTING GUIDE 9 BLOCK DIAGRAM 17 EXPLODED VIEW 18 ...

Страница 3: ...o 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 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 par...

Страница 4: ...ctrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharg ing 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 e...

Страница 5: ...he 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 replace...

Страница 6: ...e 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 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 4 Model General Specification No Item Specification Remarks 1 Receiving System ATSC NTSC M 64 QAM 25...

Страница 7: ...45 000 60 000 74 250 HDTV 720P 4 1280 720 44 960 59 940 74 176 HDTV 720P 5 1920 1080 33 750 60 000 74 250 HDTV 1080I 6 1920 1080 33 720 59 940 74 176 HDTV 1080I 7 1920 1080 67 500 60 000 148 500 HDTV 1080P 8 1920 1080 67 4320 59 940 148 352 HDTV 1080P 9 1920 1080 27 000 24 000 74 250 HDTV 1080P 10 1920 1080 26 970 23 976 74 176 HDTV 1080P 11 1920 1080 33 750 30 000 74 250 HDTV 1080P 12 1920 1080 3...

Страница 8: ... the message Copying files from memory 4 Updating is starting 5 Updating Completed the TV will restart automatically 6 If your TV is turned on check your updated version and Tool option explain the Tool option next stage If downloading version is more high than your TV have TV can lost all channel data In this case you have to channel recover if all channel data is cleared you didn t have a DTV AT...

Страница 9: ...SET and UPDATE pin Check switch SW501 SW502 Y N Check X5000 Clock 32 768KHz Check X5000 application circuit or Replace X5000 Y N Check IC5002 IIC communication state Check IIC line orreplace IC5002 N Check IR input state of IC5002 57pin Check IR board N Y Re download PTC Micom Y Check LVDS Cable Check LCD Module Controlboard Y Replace Cable N Check P401 Voltage Level 13 2V L403 Check powerconnecto...

Страница 10: ...Check tuner 5V powerL3000 YES NO Could you measure voltage of TU3001 IIC lines Are they all normal Check Mstar LVDS output NO You should check power line IIC lines YES You should replace TUNER NO Check IC5000 YES YES Check tuner 3 3V powerL3001 Replace L3001 NO Replace IC5000 Replace L3000 YES NO Check tuner 1 8V powerL3003 Replace IC3000 or IC3000 NO Check RF cable signal YES NO Replace Mstar IC1...

Страница 11: ... Shooting guide Check RF Cable Check IIC Signal TU3001 3 4Pin Check IIC line and level shifter circuit Y N Check Tuner5V Power L3000 Check L3000 Y N Y Check X201 and application circuit Check IF Signal TU3001 10 11 Pin Check tuner application circuit or replace tuner N Y Replace X201 N Y Replace IC101 Replace IC5000 N Y Replace L3000 ...

Страница 12: ...1 may have problem Replace this Jack Check the input of Mstar IC101 Measure waveform at C227 because it s more easy to check Can you see the normalwaveform Y This board hasbig problem because Main chip Mstar have some troubles After checking thoroughlyall path once again You should decide to replace Mstaror not Y Check input signal issupported format Y Check AC cable for damage or open conductor Y...

Страница 13: ... JK802 may have problem Replace this Jack This board hasbig problem because Main chip Mstar have some troubles After checking thoroughlyall path once again You should decide to replace Mstar ornot Check input signal format Is it supported Y Check AC cable for damage For damage oropen conductor Y Y Check HDMI Switch IC Power Check L800 3 3V Not stand by mode Y Swap HDMI Switch IC is there same Prob...

Страница 14: ...yall path once again You should decide to replace Mstaror not YES Check input signal format Is it supported YES Check AC cable for damage For damage oropen conductor YES Check RF Cable Signal Check Audio AMP output L5503 L5504 L5505 L5506 Y Check TU3001 Pin1 SIF Output Can you see the normalsignal Y Could you measure voltage of TU3001 IIC lines Are they all normal N You should check power line IIC...

Страница 15: ...rm Replace P3300 JK5001 Y N Check AC cable for damage For damage oropen conductor Y Y Check the input of Mstar IC101 Measure waveform at C209 C211 because it s more easy to check Can you see the normalwaveform Y Check Audio AMP output L5503 L5504 L5505 L5506 Y Replace L5503 L5504 L5505 L5506 N This board hasbig problem because Main chip Mstar have some troubles After checking thoroughlyall path on...

Страница 16: ...After checking thoroughlyall path once again You should decide to replace Mstar ornot Check the output of Mstar IC101 Measure waveform at R123 IC5600 Pin23 24 because it s more easy to check Can you see the normal signal YES NO This board hasbig problem because Main chip MStar have some troubles After checking thoroughlyall path once again You should decide to replace Mstaror not Check Audio AMP o...

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

Страница 18: ...EW Many electrical and mechanical 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 NO...

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