Main Pcbs Trouble Diagnosis; Main Pcb Trouble Diagnosis; Common Checking Process When "No Signal Of Noraster - DAEWOO ELECTRONICS DLM-26C2 Service Manual

7. Main PCBs Trouble Diagnosis

7-1. MAIN PCB Trouble Diagnosis

7-1-1. Common checking process when "No signal of Noraster"

No signal : OSD is working but no images are displaying
No raster : OSD as well as images in not working
Check Start
Does No signal screen
appear?
Y
Is the signal
input Jack properly
Y
Does input source
(AV device) work?
Y
Is input selection
in the Correct mode?
Y
Replace Main PCB
And / or Sub PCB
N
Check the connection
N
of Jack
(LCD and AV device)
N
Check AV device
N
Check input mode
Is a weak
Discharge detected
in the screen?
Y
Is LVDS connection
Correctly connected?
Y
Is waveform of H/V,
CLK in the Main PCB
Normal?
Y
Check other PCBs
and connectors
-30-
1. Check AC connection
N
2. Check Power S/ W ON
3. Check other PCBs
Check LVDS connection
N
Panel & PW30 of Main
PCB
N
Replace Main PCB
and / or Sub PCB