Samsung LE40M71B Service Manual page 30

4-2-4 No Picture (Tuner_CVBS)
Power Indicator is off.
Lamp on, no picure.
Yes
Dose the signal appear
4
at R5118?
Yes
Does the signal appear at
4
#8 of IC4001?
Yes
Does the digital data appear at
3
output of RA6053~5?
Yes
Does the digital data appear
at the output of IC4003
(RA6019_120Hz~6021_120Hz)?
Yes
Does the digital data appear
at the input of IC6003, 6004
(RA6001_120Hz~RA6003_120Hz,
RA6005_120Hz, RA6009_120Hz,
RA6016_120Hz, RA6018_120Hz)?
Yes
Does the digital data appear
at the out of L6001~12?
Yes
Check a LVDS cable?
Replace a lcd panel?
No
Connect the RF cable and
check RF signal.
No
Check a B+ voltage (#7 of Tuner) 5V,
change a main PCB ass'y
No
Change a main PCB ass'y.
No
Check a IC4001.
Change a main PCB ass'y.
No
Check IC4003
Change a main PCB ass'y.
No
Check IC6005
Change a main PCB ass'y.
No
Check IC6003,4
Change a main PCB ass'y.
No
Please, Call to Samsung Co. LTD.
4 Troubleshooting
4-7