Troubleshooting - Samsung LA22N21B Service Manual

5 Troubleshooting

5-1 No Power
LAMP off, power indicator
LED red color?
Yes
Does proper DC 14V
appear at C605, C682, C686?
Yes
Does proper DC A3.3V,
A5V, A1.8V, D1.8V appear at
C684, C687,C645,C643?
Yes
Does proper DC 5V, 3.3V,
2.5V, 9V, DNI1.8V appear at
C609, C625, C635, C652, C654?
Yes
Does proper DC 33V,
SNI_3.3V,
+3.3V_MD, +2.5V_MD1,
+2.5V_MD2, 8V, 8V_3D , SNI_1.8V
appear at C613, C437, C463,
C477,C484,
C664, C666, C453?
Yes
A power is supplied to set?
LA22N21B
No
Check a connection a power cable.
(BH39-10339X)
No
Change a adaptor.
(BN44-00109A)
Check a IC611,IC612,IC605.
No
Change a main PCB ass'y.
(BN94-00496X)
Check a IC902, IC601, IC603, IC604,
No
IC606, IC607. Change a main PCB ass'y.
(BN94-00496X)
Check a IC602, FT403, FT406, FT407, FT408,
No
IC608, IC609, FT404.
Change a main PCB ass'y.
(BN94-00496X)
Check a other function.
No
(No picture part)
Replace a lcd panel.
(BN07-00125A, BN07-00114A)
5 Troubleshooting
5-1