3-17 3-18

CIRCUIT DIAGRAM1. POWER(SMPS) CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS, UNDER NO CIR-CUMSTANCES SHOULD THE ORIGINAL DESIGN BEMODIFIED OR ALTERED WITHOUT PERMISSIONFROM THE LG ELECTRONICS CORPORATION. ALLCOMPONENTS SHOULD BE REPLACED ONLY WITHTYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR-

CUIT. SPECIAL COMPONENTS ARE SHADED ON THESCHEMATIC FOR EASY IDENTIFICATION.THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIF-

FER FROM THE ACTUAL CIRCUIT USED. THIS WAY,IMPLEMENTATION OF THE LATEST SAFETY ANDPERFORMANCE IMPROVEMENT CHANGES INTOTHE SET IS NOT DELAYED UNTIL THE NEW SERVICELITERATURE IS PRINTED.

NOTE : 1. Shaded( ) parts are critical for safety. Replace only

with specified part number.2. Voltages are DC-measured with a digital voltmeter

during Play mode.

NOTES) WarningNOTES) Parts that are shaded are criticalNOTES) With respect to risk of fire orNOTES) electricial shock.

NOTES : Symbol denotes AC ground.

Symbol denotes DC chassis ground.

3-19 3-20

TRACKING LOOP

FOCUS LOOP

SLED LOOP

SPINDLE LOOPWAVEFORM

5 6

5

2. DVD DSP CIRCUIT DIAGRAM

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3. DRIVE & RF CIRCUIT DIAGRAM

TRACKING LOOP

FOCUS LOOP

SLED LOOP

SPINDLE LOOPWAVEFORM

1

6

23

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4. MPEG CIRCUIT DIAGRAM

Optical/Coaxial out

CVBS

Y/Pb/Pr(Componet)Y/C(S-VHS)

WAVEFORM

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• WAVEFORMS

IC2A1 Pin 39, Focus ErrorIC2A1 Pin 38, PE

IC2A1 Pin 36Tracking Error

IC501 Pin 114Component Y

IC2A1 Pin 36VBR TRACKING Error

Q2A6 Collector output(TP2AO)RF

IC201 Pin 80, SLED FGIC201 Pin 154, SLED FMO

IC2A1 Pin39, Focus Error(in Focus Search)IC201 Pin 88, Focus Drive(FDO)

IC501 Pin 118, Composite IC501 Pin 112, Chrominance(Super video out Mode)

Tek Stop : 2.50MS/s 4 Acqs

M20.0µs 2 Apr 199914:47:27

Glitch Ch1Ch3 500mV

[T ]

T

3

IC501 Pin 114, Luminance(Super video out Mode)

Tek Stop : 1 00kS/s 3290 Acqs

M 500µs CH1 280/mV

Edge Slope

Type <Edge>

SourceCh1

CouplingDC

Level280mV

Mode&

Holdoff

3

Ch3 1.00V

[ T ]

Slope

T

IC501 Pin 98, MPEG Clock(27MHz)

IC501 Pin 112Component Pb

IC501 Pin 110Component Pr

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5. AUDIO CIRCUIT DIAGRAM

2CH R SIGNAL

2CH L SIGNAL

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6. MEMORY CIRCUIT DIAGRAM

program download fail

Digitron all not display system not workry

Tray not open/close

Digitron all not display system not working

Tray not open/close

Digitron all not display system not working

Digitron all not display system not working

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7. FRONT CIRCUIT DIAGRAM

Remocon not operate

SYSTEM not operateSYSTEM not operate

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8. A/V JACK CIRCUIT DIAGRAM

S VIDEO (C)

AUDIO (L)AUDIO (R)

COMP.VIDEOS VIDEO (Y)

16:9 can’t be changed

3-35 3-36

• CIRCUIT VOLTAGE CHARTIC203 IC201 IC301 IC3F1 IC501 IC305 IC2A1 IC2M1

PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY1 3.18 3.16 3.12 0 3.17 3.16 0 0 3.12 3.1 3.06 3.05 0 0 2.11 2.142 3.12 2.69 3.12 0 0 0 0 0 0 0.41 0.29 0.35 3.16 3.13 2.1 2.123 3.12 2.69 3.12 0 3.16 0 0 0 0 0.47 3.06 3.05 3.16 3.13 2.11 2.114 0 0 3.12 0 3.16 0 0 0 1.75 1.73 3.06 0.33 0.75 1.55 2.1 2.155 3.12 2.74 3.12 3.12 3.17 3.16 0 0 0 0.49 0 0 2.04 3.02 2.1 2.126 3.12 2.71 3.12 3.12 3.17 3.16 0 0 0 0 0 0 0 0 0 07 3.18 3.17 3.12 0 0 0 0 0 0 0.37 0 0.34 0 0 0 08 3.12 2.68 3.12 3.12 3.17 3.16 0 0 0 0.35 0.4 0 0 0.33 2.11 2.129 3.12 2.63 0 0 0 0 3.13 2.92 0 0.33 0 3.05 0 0 2.02 1.9910 0 0 3.12 3.12 0 0 0 0 3.22 3.19 0.33 0 0.44 0 2.1 2.1211 3.12 2.7 3.12 3.12 0 0 3.13 3.12 0 0 0.41 0 1.72 1.19 2.11 2.1212 3.12 2.7 3.12 0 0 0 3.2 3.2 0 0 0 0 2.06 2.3 2.09 2.1313 3.18 3.17 3.12 3.12 3.17 3.16 3.2 3.2 0 0 0 0.46 2.25 3.08 3.25 2.2314 0 0 3.12 0 0 0 0 0 0 0 0 0 1.32 3.13 2.51 015 3.12 3.04 3.12 0 0 0 0 0 0 0.79 3.06 3.05 1.46 2.27 2.51 016 3.12 0 3.12 0 2.17 2.18 3.19 0 0 0.74 0 0 0 2.4 0 017 3.12 3.02 3.12 0 0.38 2.21 0 0 0 0 3.09 3.07 0 0 2.18 018 0 0 3.13 3.12 0.41 0.61 0 0 0 0.71 0 2.82 0 0 0 019 0 0 3.13 0 0 0 0 0 3.22 3.1 2.84 3.03 0 0 0 020 0 3.12 0 0 0 0 0 0 3.22 3.13 3.05 2.76 0 0 1.52 1.8921 3.13 0 3.13 0 0 0 0 0 3.22 3.13 0 0 3.01 5.01 1.88 1.8922 3.13 3.17 0 0 0 0 0 0 1.64 0 0 1.38 3.85 5.01 0 023 3.13 0 0 0 0 0 0 0 0 0 0.8 0.79 0 0 3.13 024 0 0 3.13 0 0 0 0 0 3.22 3.13 0 0 0 0 0 025 3.18 0 3.12 0 0 0 3.11 3.11 0 3.13 1.14 1.1 0 0 7.95 7.9226 0 0 0 0 3.21 3.16 3.17 3.2 0 3.13 0.38 1.54 3.31 3.63 3.92 3.7127 0 0 0 3.12 0 0 0 0 3.22 3.11 0 0 0 0 3.92 3.7128 3.12 0 0 0 0 0 3.11 0 0 1.1 0 0 3.14 3.16 3.9 3.7429 0 3.12 0 0 0 0 0.61 1.07 0 0 0 0.05 5.15 5.14 3.95 3.6830 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 031 0 3.17 0 3.12 0 0 0.6 0 0 0 0 0 0 0 0 032 0 0 0 0 0 0 0 0 3.22 1.39 0 0 0 0 1.18 4.233 3.1 0 3.12 0 0 0 0.59 0 3.22 0.8 0 0 0 0 1.18 3.4334 3.18 0 3.12 0 0 0 0 0 1.75 1.52 0.34 0 5.03 4.99 0 035 1.5 0 3.12 0 0 0 0.61 0 3.22 2.76 3.03 3.05 2.29 2.34 3.92 3.7536 0 3.12 0 0 0 0 0 0 3.22 3.11 0 0.34 2.2 2.3 3.93 3.7337 0 0 1.51 0 0 0 3.18 0 3.22 3.03 0 0 2.2 2.2 3.92 3.7338 3.18 0 0 0 3.17 3.16 0 0 3.22 2.83 0 0 2.29 2.26 3.92 3.6839 3.12 3.12 0 0 0 0 0 0 3.22 3.08 0.56 0 2.24 2.24 7.95 7.9440 3.12 3.12 0 0 0 0 2.17 0 0 0 0.56 0 0 0 7.91 7.8741 0 3.17 0 0 0 0 0 0 0 0 0 3.05 5.03 5.01 0 042 3.12 0 0 0 0 0 0.38 2.28 0 0 3.03 0.45 0 0 0 043 3.12 0 0 0 0 0 0 0 0 0.34 3.03 3.05 0 0 0 044 3.18 0 0 0 0 0 0.41 0.65 3.22 3.11 0 0 5.03 1.59 0 045 3.12 3.12 0 0 3.17 3.15 0 0 0.45 0.33 0 0.44 2.3 2.3 7.95 7.9446 2.76 3.12 1.56 0 0 0 0 0 0 0 0 0 2.3 2.3 2.11 2.1247 0 0 0.91 0 3.17 3.15 0 0 0 0 0.38 0 1.74 2.3 2.1 2.1248 3.12 1.65 0 2.19 0 0 0 0 0 0 0 0 0 2.11 2.1249 3.12 3.14 0.53 0 0 0 0 3.03 0 0 050 0 0 0 0 0 0.43 0.39 0.36 3.05 2.3 2.351 0.64 0 3.17 0 0.42 0.45 0 0.34 2.3 2.352 0.43 0 3.17 3.19 0.43 0.35 0 0 2.3 2.353 0 0 3.11 2.91 3.12 3.11 0 0 2.3 2.354 2.58 0 0 0 0 0 0.41 0 2.3 2.355 0 0 0 0 0 0.33 3.03 3.05 2.3 2.356 3.11 0 0 0 0.39 0.36 0 0.34 2.3 2.357 0 0 3.17 3.19 0 0 0 0 2.3 2.358 1.65 0 0 0 0 0 0 0 2.3 2.359 1.79 0 0 0 0 0.42 0 0 2.29 2.360 0 0 0 0 0.44 0.4 0 0.79 2.29 2.361 3.13 0 0 0 0.44 0.47 0 0.79 0.36 0.5662 0 0 0 0 3.12 3.11 0 2.26 0.37 0.6263 3.13 0 0 0 0.45 0.35 0 0.74 5.03 5.0264 0 0 0 0 0 0 0 0.78 0 065 0 0 0 0 0 0 0 066 3.12 0 0 0 0 0 0 067 0 0 0 0 0 0.31 3.11 3.168 3.13 3.12 3.11 3.1 1.51 0 1.6 1.5969 4.08 0 0 0 0 1.5 0 070 3.13 0 0 3.16 1.47 0 0 071 0 0 3.11 3.1 0 0 0 072 3.13 3.13 0 0 0 0 0 073 0 0 0 0 0 0 0 074 0 0 3.11 3.1 0 0 0 0.4575 0.78 0 0 0 3.12 3.11 3.04 3.0576 1.41 0 0 0 1.48 1.26 0 077 0.77 0 0 0 1.74 1.74 0 078 0.77 0 0 0 1.54 1.54 0 079 2.1 2.11 3.17 0 1.56 1.55 0 080 2.12 2.11 0 0 3.11 3.1 0 0.3481 3.18 0 3.17 0 3.01 3.01 1.69 0

IC203 IC201 IC301 IC3F1 IC501 IC305 IC2A1 IC2M1PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY82 3.18 0 3.17 3.19 0 0 0 083 1.93 1.93 2.12 2.27 0 0.33 0 084 2.11 2.11 0 0 1.74 5.12 0 085 0 0 4.41 4.41 0 0 0 0.3386 0 0 0 0 0 0 0 087 1.93 0 0 0 1.42 3.1188 2.1 0 3.17 3.19 1.87 3.1189 1.93 1.92 2.66 0 1.67 1.7490 1.59 0 0 3.17 0 091 0.8 0 3.19 0 3.11 3.1192 2.36 2.36 3.19 3.19 0 3.1193 2.24 1.6 3.19 3.19 3.11 3.1194 1.58 1.56 0 0 0 0.3495 1.64 1.62 3.13 3.13 0 0.3496 1.58 1.62 0 0 2.82 3.1197 1.58 1.56 3.19 3.19 0 098 0 0 3.19 3.19 0.85 0.9299 0 0 0.36 0.36 0.89 0.93100 1.58 0 0 0 0 0101 3.18 0 1.79 1.74102 3.18 0 3.23 3.1103 2.01 2.01 0 0104 2.01 2.01 0 0105 0 0 0 0106 3.12 0 0 0107 2.07 3.12 3.23 3.09108 0.41 0 1.74 1.74109 0 0 0 0110 2.15 0 1.75 1.3111 0 0 0.34 0.74112 0 0 0 1.39113 0 0 3.2 3.1114 0 0 0.49 0.64115 0 0 0 0116 0 0 1.17 1.29117 0 0 1.79 1.74118 0 0 0 0.74119 0 0 1.17 1.28120 3.12 0 2.04 1.82121 0 0 0 0122 3.12 3.12 0 0123 3.12 3.12 0 0.36124 0 0 0 0.36125 3.12 3.12 3.16 3.1126 3.12 0 0 0.36127 2.42 0 0 0128 0 0 0 0129 2.41 0 0 0130 3.18 3.17 0 0131 3.12 3.12 0 0132 3.12 0 0 0133 0 0 3.13 0134 3.12 3.12 0 0135 3.12 3.12 1.74 1.74136 2.45 2.33 0 0137 1.68 1.65 0 0138 1.77 1.87 0 0139 2.45 2.33 0 0140 2.61 0.32 3.13 3.1141 2.54 0 0 0142 3.12 0 0 0143 0 0 0 0144 0 0 0 0145 0 0 3.13 3.09146 2.54 0 0 0147 2.54 0 0 0148 2.54 0 0 0149 2.54 0 0 0150 4.76 0 0 0151 4.13 0 0 0152 0 0 0 0153 0 0 0 0154 0 0 3.13 3.1155 3.12 0 0 0156 3.12 0 3.13 3.09157 3.12 0 0 0158 0 0 0 1.73159 0 0 1.74 1.73160 0 0 1.12 1.83161 2.64 2.62 3.13 0162 3.18 3.16 0 0

IC203 IC201 IC301 IC3F1 IC501 IC305 IC2A1 IC2M1PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY163 3.18 3.15 0 0164 2.02 0 0 0165 2.08 0 0 0166 2.09 0 0 0167 1.57 0 0 0168 2.51 0 0 0169 1.6 1.57 3.13 3.1170 3.13 3.01 3.13 0171 2.53 0 0 0172 0 0 0.44 0.6173 3.11 0 0.4 2.15174 3.11 0 2.2 2.15175 3.11 3.1 0 0176 0 0 0.66 0.8177 3.12 0 0 0178 3.12 2.59 0.65 0.83179 3.11 3.03 0.65 0.79180 0 0 0.67 0.79181 0 0 0 3.1182 0 0 3.13 3.1183 0 0 0 0184 0 0 3.13 3.1185 0 0 0 0186 3.17 0 0 0187 0.69 0 0 0188 3.18 3.12 0 0189 0.66 0.77 0 3.1190 0.65 0 0 0191 0.67 0.87 0 0192 0 0 0 1.75193 2.21 2.17 3.13 3.09194 0.41 0 3.13 3.16195 0.45 0 0 0196 0 0 3.13 3.1197 0 0 0 0198 0 0 3.13 0199 0 3.12 3.13 3.1200 0 0 0 3.1201 0 0 0 0202 0 1.22 3.18 0203 0 1.22 3.18 3.1204 0 0 0 0205 3.11 3.11 0 0206 1.53 3.11 0 3.1207 3.12 0 0 0208 3.12 3.12 0.37 0209 0 0210 3.13 3.1211 0 0212 0 0213 0 0214 0 0215 0 0216 0 0217 0 0218 0 0219 0 0220 0 3.12221 0 0222 0 0223 0 0224 0 0225 3.13 0226 0 0227 0 0.41228 0 0229 0 0230 0 0231 0 0232 0 0.43233 3.24 0234 0 0.45235 0 0.34236 0 0237 0 0238 0 0239 0 0240 0 0.36241242243

3-37 3-38

IC901 IC401 IC402 PIN STOP PLAY STOP PLAY STOP PLAY1 3.46 3.47 2.98 2.98 5.47 5.472 0.64 0.66 3.26 3.26 5.47 5.473 0 0 0 0 5.47 5.474 0 0 1.57 0 0 05 0 0 1.58 1.58 5.47 5.476 5.1 5.09 1.3 0 5.47 5.477 0 0 0 0 5.47 5.478 0 0 3.24 3.24 11.95 11.959 0 0 0 010 0 0.95 3.2 3.1911 4.88 0 4.85 4.8412 0 0 2.31 013 0 0 2.35 014 0 0 2.35 015 5.14 5.14 0 016 3.68 3.64 0 017 0 0 4.91 018 0 5.08 2.34 2.3419 2.27 0 2.34 2.3320 0 0 0 021 0 022 0 023 0 024 0 5.0625 0 026 5.11 5.0927 0 028 0 0293031323334353637383940414243444546474849505152535455565758596061626364

IC503 IC502 IC2A4 IC2A2 IC206 IC504 IC506PIN STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY1 0 0 0 0 4.87 4.39 1.57 1.56 2.63 2.64 2.11 2.19 (IN)0 02 3.1 3.1 5.03 5.03 2.3 2.31 1.57 1.56 2.74 0 5.05 5.05 (OUT)1.80 03 5.03 5.03 0 0 2.29 2.29 1.57 0 2.74 2.76 2.37 2.444 0 0 5.1 5.1 0 0 0 0 0 0 0 05 0 0 0 0 2.29 2.29 1.62 1.62 1.92 1.886 0 0 5.04 5.04 2.3 2.31 1.62 1.62 2.28 07 5.05 5.05 0 0 2.51 2.45 1.62 1.62 2.28 08 0 3.15 5.03 5.04 5.02 5.02 5.04 4.99 5.04 09 0 010 0 011 0 0.4612 0 0.1513 3.11 3.114 0 015 0 016 0 017 3.09 3.0918 5.15 5.1419 0 020 5.15 5.15

Q2M1 Q2A1 Q2A6 Q2A5 Q2A2STOP PLAY STOP PLAY STOP PLAY STOP PLAY STOP PLAY

E 0 0 5.02 0 0 2.41 2.34 2.35 5.02 4.95B 0 0 0 0 3.62 3.72 3.82 0 0 0C 0 3.14 0 0 0 3.1 0 0 5.01 4.94