Samsung LA22N21B Service Manual page 34

5 Troubleshooting
5-3 No Video (Digital PC Signal)
Power Indicator is off.
Lamp on, no video.
Yes
Check a PC source and check
the connectionn of DVI cable?
Yes
Does the digital data
6
appear at FT302 ~FT305
(Data, Clk +/-)?
Yes
Does the digital data
appear at output of
7
RA308~RA311,
RA313, RA314 ?
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)
5-4
No
Input a digital PC signal and connected
cable. (BN39-00126A)
No
Check a DVI cable. (BN39-00126A)
Check a IC301 and IC105.
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.
LA22N21B