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ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS
1. MAIN, FRONT & TUNER PART
No
Symptom
1
No Power
2
Not available Remocon
3
Not available to Volume Control
4
Not available to Key Control
5
No sound
6
No Line out signal
7
Not avaliable to Telephone Mute
8
Not avaliable to
ANT(Motor Type) Control
9
Not avaliable to Remote
(Power AMP)
10 No output Beep sound.
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
SECTION 2 ELECTRICAL
Check Point
SYSTEM CONTROL
Checked the Fuse.
Checked the Back up Vdd, Gnd.
Checked the Micom Back Up Vdd.
Checked the Micom Ground.
Checked the Reset.
Checked the X-tal.
Checked the ACC In.
Checked the Detachable Switch.
Checked the Flipdown Switch.
Checked the Key Line.
Checked the Remocon Sens Vdd, Line. CN404(5), IC402(81), RM901
Checked the Encoder Volume.
Checked Tact Switch.
Checked Key Line.
Checked the E-VR Vdd.
Checked the E-VR Ground.
Checked the E-VR Control.
Checked the E-VR Signal In/Out.
Checked the E-VR Mute Control
Checked the Power IC Vdd.
Checked the Power IC Ground.
Checked the Power IC Control.
Checked the Power IC Signal In/Out.
Checked the E-VR Output.
Checked the Output.
Checked the Telephone Mute Control.
Checked the Mute Control.
Checked the ANT Control.
Checked the Remote Control.
Checked the Beep Control.
CN302
CN302(15,16)
IC301(14), D428,
IC402(30,47,50,99,100)
IC402(20,51,97,98)
IC401, IC402(90)
X401, X402
Q301, Q302, IC402(40), CN302(14)
SW400, IC402(70)
CN407(24), IC402(69)
IC402(52,53)
EV901, IC402(74,75)
SW901 ~ SW909, SW911 ~ SW919
IC402(52,53)
IC601(15)
IC601(1,22)
IC601(20,21), IC402(3,4)
IC601(3,4,5,6,7,10,11)
IC601(12,13,14,15)
IC601(19), IC402(14)
IC801(6,20)
IC801(1,2,8,13,18,24)
IC801(4,22), IC402(17,18)
IC801(11,12,14,15)
IC801(3,5,7,9,17,19,21,23)
IC601(12,13,14,15)
JK601
CN406(2)
IC402(38), Q312, Q313
CN302(10), IC301(12,13), IC402(35)
IC301(2), CN406(1), Q311
IC402(80), R801
2-1
Location No.
LGE Internal Use Only
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