Pioneer VSX-LX53 Service Manual page 41

5
QQ
3 7 63 1515 0
Step 2: Xtal
Step 2-1: VIDEO BLOCK
IC904 (Pins 4,5)
Is there a
27 MHz output?
Yes
X1101 (Pins 1,3)
Is there a
28 MHz output?
Yes
X1201 (Pins 1,3)
Is there a
20 MHz output?
Yes
To step 3-1
Step 3: Reset
Step 3-1: VIDEO BLOCK
TE
L 13942296513
IC604 (Pin 76)
Is the
voltage of around
3.3 V?
Yes
IC904 (Pin 21)
Is the
voltage of around
3.3 V?
Yes
voltage of around
IC604 (Pin 82)
Is the
voltage of around
3.3 V?
Yes
R1226
www
Is the
voltage of around
3.3 V?
.
Yes
5
http://www.xiaoyu163.com
No
Check the X901 and its
peripheral circuits.
(H: around 1.5 Vp-p)
No
Check the X1101 and its
peripheral circuits.
(H: around 1 Vp-p)
No
Check the X1201 and its
peripheral circuits.
(H: around 1.8 Vp-p)
XHDRXRST
No
Replace IC604.
XHDRXRST
No
R720
Is the
No
Replace IC604.
3.3 V?
XVSRST
No
Replace IC604.
XVSRST
x ao
No
y
Replace R1226.
i
(Check it with the series resistance immediate
before the through-hole because this product is
IC1204BGA package.)
http://www.xiaoyu163.com
6
8
IC604 (Pin 80)
Is the
voltage of around
3.3 V?
IC1602 (Pin 25)
Is the
voltage of around
3.3 V?
IC604 (Pin 81)
Is the
voltage of around
3.3 V?
IC1603 (Pin 25)
Q Q
3 6 7 1 3
Is the
voltage of around
3.3 V?
R295 (Signal side)
Is the
voltage of around
3.3 V?
IC1102 (Pin 51)
Is the
voltage of around
3.3 V?
If any type of video does not output
u163
from all of video outputs, Replace
DIGITAL MAIN ASSY.
.
If specific video does not output, go
to an appropriate flowchart from
among Step 4 depending on the
symptom of the unit.
VSX-LX53
6
7
2 9 9 4 2 8
XHDTX1RST
No
Replace IC604.
Yes
XHDTX1RST
No
Check the patterns between
IC604 (Pin 80) and IC1602 (Pin 25)
(Include R711,R1648).
Yes
XHDTX2RST
No
Replace IC604.
Yes
XHDTX2RST
1 5 0 5 8 2 9 9 4
No
Check the patterns between
IC604 (Pin 81) and IC1603 (Pin 25)
(Include R710,R1649).
Yes
(Analogue Input Only)
XVDECRST
No
Replace Assy.
Yes
XVDECRST
No
R1118
Yes
Is the
No Check the patterns
voltage of around
between
3.3 V?
IC101 and R1118.
Yes
m
co
7
8
9 9
A
B
C
2 8 9 9
D
E
F
41
8