Samsung LA22N21B Service Manual page 39

5-5 No Picture (Video_CVBS)
Power Indicator is off.
Lamp on, no picure.
Yes
Dose the signal
8
appear at #6 of IC202?
Yes
Does the signal appear at
9
#72 (Y), #71 (C) of IC201?
Yes
Does the digital data
appear at output of
10
RA201, 202 (Y),
RA203, 204 (C)?
Yes
Does the digital data
appear at output of
11
RA408, 409 (Y),
RA416, 417(C)?
Yes
Does the digital data
3
appear at output of
RA555~RA559, RA561?
Yes
Does the digital data appear at
4
output of RA402~RA407?
Yes
Does the digital data appear at
5
output of FT501~FT503,
FT505 ?
Yes
Check a LVDS cable?
Replacea lcd panel?
(BN07-00114A, BN07-00125A)
LA22N21B
No
Check a A/V cable and video signal.
(BN39-00057A)
Check a connection harness.
No
Change a A/V input jack ass'y
(BN96-00894A).
Check a IC202.
No
Change a main PCB ass'y
(BN94-00496X).
Check a IC201 and IC902.
No
Change a main PCB ass'y
(BN94-00496X).
Check a IC405 and IC406.
No
Change a main PCB ass'y
(BN94-00496X).
Check a IC565, IC105 and IC506.
No
Change a main PCB ass'y
(BN94-00496X).
Check a IC403.
No
Change a main PCB ass'y
(BN94-00496X).
Check a IC503.
No
Change a main PCB ass'y
(BN94-00496X).
No
Please, Call to Samsung Co. LTD.
5 Troubleshooting 5 Troubleshooting 5 Troubleshooting
5-9