LG W1946S Service Manual Download Page 14 | Manualshive

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Copyright 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

LGE Internal Use Only

TROUBLESHOOTING GUIDE

1. NO POWER

NO POWER

(POWER INDICATOR OFF)

CHECK U201

NO

NO

CHECK POWER BOARD,

AND FIND OUT A SHORT

POINT AS OPENING

EACH POWER LINE

CHECK IC1(3.3V)

IC1(1.8V) LINE

NO

CHECK CRYSTAL(X501)

YES

YES

YES

CHECK P605 VOLTAGE

PIN5, PIN6 (5V)?

IS IC1 PIN

1

(3.3V)

IC1 PIN

4

(1.8V)

CHECK U201 PIN1

PULSE

1

2

1

3

1

4

Waveforms

1

P605-#5,6

2

IC1-#2

3

IC-#2

4

U201-#1

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Summary of Contents for W1946S

Page 1: ...NITOR SERVICE MANUAL Website http biz LGservice com CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM84K MODEL Same model for Service Internal Use Only W1946S W1946S BFW ...

Page 2: ...FC 30000 1 Typ 3 SIGNAL Refer to the Timing Chart 3 1 Sync Signal Type Separate Sync SOG Digital 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 7 V 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal 28 61kHz Vertical 56 75Hz 4 MAX RESOLUTION 1360 x 768 60Hz 5 POWER SUPPLY 5 1 Power Adaptor Built in Power Input AC 100 240V 50 60Hz 0 8A 5 2 Power Consumption 6 ENVIRONMENT 6 1 ...

Page 3: ... pen as this may result in damage to the panel Protect the module from the ESD as it may damage the electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the ...

Page 4: ...eat sinks are correctly installed 8 Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sen...

Page 5: ... by gently prying up on the lead with the soldering iron tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire b...

Page 6: ... and carefully crimp it around the IC pin Solder the IC connection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This ...

Page 7: ...75 59 94 525 480 10 2 33 640 x 480 H Pixels 37 5 840 640 16 64 120 3 V Lines 31 5 75 500 480 1 3 16 640 x 480 H Pixels 37 879 1056 800 40 128 88 4 V Lines 40 0 60 317 628 600 1 4 23 800 x 600 H Pixels 46 875 1056 800 16 80 160 5 V Lines 49 5 75 0 625 600 1 3 21 800 x 600 H Pixels 49 725 1152 832 32 64 224 6 V Lines 57 283 74 55 667 624 1 3 39 832 x 624 H Pixels 48 363 1344 1024 24 136 160 7 V Line...

Page 8: ... face down 5 Disassemble back cover Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only DISASSEMBLY Set Good Position Bad Position If you can t release the stand base even the locking knob is at a release position Please push the indicated knob down and retry it Pushing the PUSH button Take the stand body from hinge body ...

Page 9: ...right reserved Only for training and service purposes LGE Internal Use Only BLOCK DIAGRAM Analog R G B ADC TMDS RX MCU Scaler LVDS TX OSD SSC Flash ROM D SUB LIPS Panel 5V 3 3V Key Flash ROM Regulator 5V 3 3V 1 8V AC input 5V 12V Ready Crystal ...

Page 10: ...analog to digital interpolates input to 1360X780 W1946S resolution signal and outputs 8 bit R G B signal to transmitter 2 Power Part This part consists of the one 3 3V and one 1 8V regulators to convert power which is provided 5V in Power board 12V is provided for inverter in W1946S Also 5V is converted 3 3V and 1 8V by regulator Converted power is provided for IC in the main board The inverter co...

Page 11: ...r transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor 3 Energy Transfer This part function is for transfer the primary energy to secondary through a power transformer 4 Output rectifier and filter This part function is to make a pulse width modulation control and to provide the driver signal to power switch to adjust the duty cycle during different AC inpu...

Page 12: ...need setup Windows 2000 XP Need to Port Setup This program is available for LCD Monitor only 1 Port Setup a Copy UserPort sys file to c WINNT system32 drivers folder b Run Userport exe c Remove all default number d Add 300 3FF e Click Start button f Click Exit button 2 EDID Read Write 1 Run WinEDID exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b Click Upda...

Page 13: ...switch at the right side of the display 2 Wait for about 5 seconds and press MENU POWER switch for 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a CLEAR ETI To initialize using time c Auto Color W B balance and Automatically sets the gain and offset value press key for over 3 sec d AGING Select Aging mode on off b Module To select applied ...

Page 14: ...IDE 1 NO POWER NO POWER POWER INDICATOR OFF CHECK U201 NO NO CHECK POWER BOARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK IC1 3 3V IC1 1 8V LINE NO CHECK CRYSTAL X501 YES YES YES CHECK P605 VOLTAGE PIN5 PIN6 5V IS IC1 PIN1 3 3V IC1 PIN4 1 8V CHECK U201 PIN1 PULSE 1 2 1 3 1 4 Waveforms 1 P605 5 6 2 IC1 2 3 IC 2 4 U201 1 ...

Page 15: ... 3V NO RASTER OSD IS NOT DISPLAYED CHECK POWER BOARD LIPS CHECK P605 VOLTAGE PIN5 6 5V NO NO NO NO 1 CONFIRM BRIGHTNESS OSD CONTRL STATUS 2 CHECK MICOM DIM ADJ PORT CHECK P605 PIN10 POWER BOARD LIPS CHECK PULSE AS CONTACTING PROBE TO THE LAMP WIRE OF THE LCD MODULE REPLACE LCD MODULE YES 1 2 3 4 YES YES YES Waveforms 1 P605 5 6 2 P605 9 3 P605 10 Brightness 100 5 LAMP CURRENT 3 P605 10 Brightness ...

Page 16: ...HECK PIN 1 2 SOLDERING CONDITION 2 CHECK X501 3 TROUBLE IN U201 CHECK U201 PIN51 3 3V PIN30 1 8V NO NO NO CHECK IC1 3 3V IC1 1 8V U201 PIN 1 2 14 3MHZ CHECK CONNECTION LINE FROM D SUB TO U201 TROUBLE IN CABLE OR LCD MODULE YES YES NO RASTER OSD IS NOT DISPLAYED CHECK U201 PIN16 H SYNC AND PIN17 V SYNC IS PULSE APPEARED AT SIGNAL PINS YES 1 Waveforms 1 U201 1 ...

Page 17: ... training and service purposes LGE Internal Use Only 4 TROUBLE IN DPM TROUBLE IN DPM TROUBLE IN U201 CHECK PC PC IS GOING INTO DPM MODE NO CHECK H V SYNC LINE NO YES CHECK P611 AND R612 SYNC APPEARED CHECK U201 PIN 16 17 SYNC PULSE YES 1 H SYNC 2 V SYNC Waveforms 1 2 ...

Page 18: ...EXPLODED VIEW 19 910 920 400 410 450 460 420 200 300 330 310 320 340 ...

Page 19: ......

Page 20: ......

Page 21: ......

Page 22: ...P NO MFL61926869 Printed in China Jan 2010 ...

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