Troubleshooting - Samsung LTM225W Service Manual

5 Troubleshooting

5-1 No Power
Does proper DC 14V
1-1
appear at Pin 1 of CN923?
Yes
Does proper DC 3.3V_A
1-2
appear at Pin 2 of IC811?
Yes
Does proper DC 2.5V_A
1-3
appear at Pin 3 of IC802?
Yes
Does proper DC 3.3V_B
1-4
appear at Pin 1 of IC805?
Yes
Does proper DC 2.5V_B
1-5
appear at Pin 3 of IC806?
Yes
Does proper DC 5V_A
1-6
appear at Pin 2 of IC812?
Yes
Does proper DC 5V_A
1-7
appear at Pin 2 of
1-8
IC804 and Pin 2 of IC967?
Yes
Does proper DC 12V
1-9
appear at Pin 2 of IC807?
Yes
Does proper DC 8V_A
1-10
appear at Pin 3 of IC803?
LTM225W
No
Check SMPS's part and adapter.
IC811 is bad.
No
Change main assy.
(BN94-00397A)
IC802 is bad.
No
Change main assy.
(BN94-00397A)
IC805 is bad.
No
Change main assy.
(BN94-00397A)
IC806 is bad.
No
Change main assy.
(BN94-00397A)
IC812 is bad.
No
Change main assy.
(BN94-00397A)
IC804 or IC967 are bad.
No
Change main assy.
(BN94-00397A)
IC807 is bad.
No
Change main assy.
(BN94-00397A)
IC803 is bad.
No
Change main assy.
(BN94-00397A)
CONFIDENTIAL
5-1