Pioneer VSX-1020-K Service Manual page 31

5
HDMI & DVC Block Troubleshooting
<When no image is displayed after the unit is turned on, the HDMI LED on the front panel lights, and the HDMI or analog signal is input.>
• If conversion between 480i and 480p is not possible, it is most likely that IC800 is in failure. Check its peripheral circuits.
• Assume that the LCRs are neither in poor connection nor damaged.
• Analog video Convert (Ex.: S → COMPONENT) is satisfied by diagnosing the input and output.
• Although diagnosis is assumed to be performed from Side A, the wiring numbers on Side B are also described in the flowchart.
• This shows failure analysis for the HDMI & DVC Part of the D-MAIN Assy.
• The confirmation of peripheral circuits means mainly a power supply of IC, a sync signal, a existence of the input/output signal,
a conduction check and the appearance check of the bridges.
A
• The parts marked like in the following chart are located in "Check Points of the D-MAIN Assy."
Step 1: Power supply
CN1900 (Pins 1, 2)
V+13_UN
Is the
No
voltage of around
Check the MAIN Assy.
13 V input
?
A
Yes
L1902
V+5_DDD
Is the
No Check Q1900 and its periphery.
voltage of 5 V
(Pins 1,2,5,6: around 9 V
output?
B
Yes
R1916
V+5_HD
Is the
Check Q1900 and its periphery.
No
voltage of around
(Pins 1,2,5,6: around 9 V
5 V output?
C
Yes
L1931
V+3R3_HHH
Is the
No Check Q1930 and its periphery.
voltage of around
(Pin 1: around 7.5 V Square wave
3.3 V output
?
D
Yes
L1932
V+1R8_HHH
Is the
No Check Q1931 and its periphery.
voltage of around
(Pin 1: around 5.5 V Square wave
1.8 V output
?
D
Yes
5
6
Pin 3: around 6 V Square wave)
NG
Check IC1900 and its
peripheral circuits.
Pin 3: around 6 V Square wave)
NG
Check IC1900 and its
peripheral circuits.
Pins 5,6: around 16.5 V)
NG
Check IC1930 and its
peripheral circuits.
Pins 7,8: around 16.5 V)
NG
Check IC1930 and its
peripheral circuits.
6
7
IC1100 (Pin 5) (side B)
Is the
voltage of around
3.3 V output
?
Yes
IC1101 (Pin 5) (side B)
Is the
voltage of around
3.3 V output
?
Yes
IC1102 (Pin 5) (side B)
Is the
voltage of around
2.5 V output
?
Yes
IC1104 (Pin 5) (side B)
Is the
voltage of around
1 V output
?
Yes
To Step 2
VSX-1020-K
7
8
V+3R3_EM_V
No
Check IC1100 and its peripheral
circuits.
V+3R3_EM_D
No
Check IC1101 and its peripheral
circuits.
V+2R5_EM
No
Check IC1102 and its peripheral
circuits.
V+1_EM
No
Check IC1104 and its peripheral
circuits.
8
A
B
C
D
E
F
31