Daewoo LCD TV, Service Manual

Page: 16 / 56

Hardware Troubleshooting : Digital Board
-16-
1.3 In case of DTV mode
START
Select Air/Cable in Ant. Set correctly
Check the SMPS and input voltage
IC501 Problem.
Replace the Main PCB
Check the path from
TU101 to IC101
Check
1. The SNR is over 15dB
2. “Get 1SecSer” is “0”
The signal quality is poor.
1. Check the ANT or its connection is correct
2. Consult a local installer.
Perhaps Connector and Cable
Problem.
Replace the Main PCB
Check
the “Ant. Set” is correct
in Menu
Yes
No
Check
the LVDS connector and cable
is correct
Check
the LVDS signal output of IC501 is correct
(Pin A14, B14, A15, B15, A16, B16, A17,
B17, A18, B18, A19, B19)
Yes
No
No
Yes
Check
the input power of
IC501 is correct
No
No
Is “Lock status” “1(LOCK)”
when “Digital signal status” is
“on” in Service mode S10?
Yes
Check the path from IC301 to IC501
Yes
Does
digital signal input from IC301
to IC501
No
Check the path from IC301 to IC501
Yes
Does
TS signal input from IC101
to IC301
No
Yes
No