Pioneer VSX-LX52 Service Manual page 39

5
Step 4-3: HDMI IN 4 (Front IN)
CN1601 (Pin 20)
V+5_f
No
Is the voltage
Check the soldering of CN1601.
around 5 V ?
O
Yes
Diagnose the FRONT HDMI &
USB Assy.
Check the source equipment.
CN1601 (Pin 16)
Hot plug detect
No
Is the voltage
Check the soldering of CN1601.
around 5 V ?
Yes
Check IC1601 and its peripheral
circuits.
CN1601 (Pins 14,15)
DDC (SDA/SCL)
Does
No
a signal output in
Check the soldering of CN1601.
constant period
?
Yes
Diagnose the FRONT HDMI &
USB Assy.
CN1601
TMDS signal
(Pins 2,3,5,6,8,9,11,12)
Is there
No
0.5Vp-p in CLK
Check the soldering of CN1601.
and DATA?
Yes
Diagnose the FRONT HDMI &
USB Assy.
IC1601 (Pins 48,49,51,
TMDS signal
52,54,55,57,58)
Is there
No
Check the soldering between
0.5Vp-p in CLK
IC1601 and CN1601.
and DATA?
N
Yes
IC1601 (Pins 25,26,
TMDS signal
28,29,31,32,34,35)
Is there
No
Check IC1601 and its peripheral
0.5Vp-p in CLK
circuits.
and DATA?
N
Yes
A
To Step 5
5
6
Analog IN, HDMI OUT
Step 5: COMPONENT IN
Step 5-1: HDMI OUT (more than 480p)
CN1254 (Pin 5)
NG
Is the voltage
P
NG
CN1254 (Pins 13,15,17)
analog video
NG
Q1151,Q1155,Q1157
(Emitter), (side B)
signals output at
NG
IC1701 (Pins 2,5-8,12-19,
25-28,59-62,64),R1706
(side B)
signals output?
NG
IC1807,IC1808(side B),
IC1809,IC1810(side B),
IC1811(side B)
(Pins 11-17)
signals output?
Whole
diagram
VSX-LX52
6
7
COMPDET
No
Check CN1254 and diagnose
the COMPONENT Assy.
"H" ?
Yes
Y_IN, CB_IN, CR_IN
Is there a
No
Check CN1254 and diagnose
the COMPONENT Assy.
signal? *
* Diagnose it from the COMPONENT Assy side.
Yes
SG_A, SG_B, SG_C
Are the
No
Check Q1151, Q1155, Q1157 and
its peripheral circuits.
emitter?
Yes
Q** RXHSYNC, RXVSYNC, VOCLK
Are the
No
Check IC1701 and its peripheral
circuits.
Yes
P** HSYNC, VSYNC, PDE, PDCLK
Are the
No
Check IC1807-IC1811 and its
peripheral circuits.
Yes
Check IC1501 and its peripheral
circuits.
B
To Step 5-2
7
8
A
B
C
D
NG
E
F
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