VSX-74TXVi
210
1
2
3
4
1
2
3
4
C
D
F
A
B
E
• It is assumed that there is no loose connection or damage in the
LCRs.
• There must not be an abnormality in pattern.
Step 2: Power supply and clock
Step 1: Connections
CN1001, CN1002
Is soldering of
the connectors
OK?
Solder the connectors
correctly.
No
,
C1002 (+ side)
C903 (+ side)
Is the voltage
5V?
No
5V input
3.3V
Check the INTERFACE Assy
and DC/DC Assy.
Check the INTERFACE Assy
and DC/DC Assy.
Yes
Is the voltage
3.3V?
No
Check the soldering of IC901.
If soldering has not been done
correctly, replace IC901.
Check the soldering of IC911.
If soldering has not been done
correctly, replace IC911.
Check the soldering of X501 or
IC501. If soldering has not been
done correctly, replace X501 or
IC501.
Check the soldering of X101 or
IC101. If soldering has not been
done correctly, replace X101 or
IC101.
Check the soldering of CN101.
If soldering has not been done
correctly, replace CN101.
Check the soldering of IC902.
If soldering has not been done
correctly, replace IC902.
Check the soldering of IC903.
If soldering has not been done
correctly, replace IC903.
Check the soldering of IC904.
If soldering has not been done
correctly, replace IC904.
Yes
Yes
To Step 2
To Step 3, 4
C
Step 3: HDMI
IC101 (pins 39, 40,
43, 47, 48, 51, 52)
Do signals
(approx. 0.5 Vp-p)
run in all the
lines?
Step 3-1: Rx
No
TMDS_RX1
L
K
A
B
D
C906 (+ side)
1.8V
Is the voltage
1.8V?
No
Yes
E
C909 (+ side)
3.3V
Yes
R118-R124
X'TAL
Is oscillation
of 27 MHz
output?
No
Yes
Is the voltage
3.3V?
No
Yes
F
C913 (+ side)
Yes
1.8V
Is the voltage
1.8V?
No
G
Q911 Emitter
UNReg input
Is the voltage
about 12V?
No
Yes
H
C918 (+ side)
5V
Is the voltage
5V?
No
Yes
I
X501
X'TAL
Is oscillation
of 15.7 MHz
output?
No
Yes
J
HDMI Troubleshooting
A