LG flatron M1740A - Troubleshooting Guide

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Check Micom ID & Version
Check Key Board
NO
NO
NO
Check Lips
Change Micom
Check Crack of Damage
Of Circuit Item
Around U903,U906
NO
Check U402
YES
YES
CHECK J901 Voltage
Pin #1,#2 : 15V
Pin #5,#6 : 5V
Check U903 Pin #3 : 3.3V
Check U906 Pin #3 : 1.8V
Check X401 : 14.318Mhz
1
2
3
4
5
1 2
Waveforms
J901-#1,2(15V) J901-#5,6(5V)
4 5
U906-#3(1.8V) X401(14.318Mhz)
3
U903-#3(3.3V)
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
YES
YES