Service manual

Troubleshooting
7-10 Samsung Electronics
Video output error in
RCA Jacks
Power level is
normal at pin 6, 17, 20, 25, 28,
31, 36, 39 in VIC50?
27MHz clock input
is normal at pin 4 in
VIC50?
Check the connection between
pin 2 in PIC6 and Emmiter in PQ24.
Check the connection between
pin 10 in VIC6 and pin 4 in VIC50.
Yes Yes
No No
MRST is high state
at pin 40 in VIC50?
Yes
No
Control signal is
normal at pin 41, 42 in VIC50?
(When power on
or open)
Yes
No
SYNC signal is
normal at pin 7, 8 in
VIC50?
Check the soldering of VIC50.
Yes
Check the connection between
pin 1 in FIC1 and pin 40 in VIC50.
Check the connection between
pin 86, 87 in MIC1 and pin 41, 42 in VIC50.
Check the connection with
pin 180, 182, 184 ~ 189 in VIC1.
Video data are inputed
normally at pin 9 ~ 16 in
VIC50?
Analog signals output
normally at pin 30, 27, 24,
29, 23, in VIC50?
Yes
No
Yes
D
Change VIC50.
No
No
Check the soldering of VIC50.
Change VIC50.
No
No
Analog signals
are inputed normally at pin 2, 4,
7 in VIC51, 52?
Power is normal
at pin 16 in VIC51, 52?
Check the connection between
VIC50 and VIC51, 52.
Check the connection between
VIC51, 52 and Emmiter of PQ24.
Yes
No No
Pin 1 in VIC51, 52 is in
Low state?
Yes
No
Video signals of
about 2V appear at pin 10, 13, 15
in VIC51, 52?
Yes
No
Video signals of
about 1V appear at
output jacks?
Check the soldering of
VIC51, 52.
Yes
Connect to ground.
Check the connection between
VIC51, 52 and output jacks.
Check the RCA cable.
Yes
D
Change VIC51, 52.
No
No