Troubleshooting Guide - LG flatron M1740A Service Manual

NO POWER
(POWER INDICATOR OFF)
1
CHECK J901 Voltage
Pin #1,#2 : 15V
2
Pin #5,#6 : 5V
Check Micom ID & Version
3
Check U903 Pin #3 : 3.3V
4 Check U906 Pin #3 : 1.8V
5
Check X401 : 14.318Mhz
Check Key Board
Waveforms
1
J901-#1,2(15V)
4
U906-#3(1.8V)

TROUBLESHOOTING GUIDE

1. NO POWER
YES
YES
YES
YES
2
J901-#5,6(5V)
5
X401(14.318Mhz)
NO
NO
NO
NO
3 U903-#3(3.3V)
- 15 -
Check Lips
Change Micom
Check Crack of Damage
Of Circuit Item
Around U903,U906
Check U402