Pioneer PDP-435PG Service Manual page 62

1
• Block diagram of the shutdown signal system
Note:
A
The figures 1 - 5 indicate the number of times
the LED flashes when shutdown occurs in the
corresponding route.
HD AUDIO AMP
ASSY
A1
IC3504
AMP
A_NG
B
IC3502
VOLUME IC
• Diagnosis of shutdown
SD Circuit in
LED
Operation
C
Communication
1 time failure of the
panel-drive IC
Communication
failure of the
module IIC
2 times
(Check the
D
shutdown
subcategory on
the Factory menu.)
Power decrease of
3 times
DIGITAL-DC-DC
E
Panel having
4 times
higher temperature
5 times Audio failure
F
60
1
2
DIGITAL VIDEO ASSY
TXD_IC4
RXD_IC4
PANEL IF
CLK_IC4
ASSY
IC4_CE
IC4_BUSY
R7 R4 D15
5
2
IC4002
EEPROM
A_SCL
2
A_SDA
B_SCL
B_SDA
Reason for
Defective Assy
Shutdown
Communication failure
of IC4
DIGITAL VIDEO
Writing failure of IC4
Communication failure
DIGITAL VIDEO
of the EEPROM (4K)
Communication failure
of the EEPROM (2K)
Disconnection of cable CN4009 - CN3501
PANEL IF
Defective 114-pin FPC CN4004 - CN5001
Defective volume IC
HD AUDIO
Defective DC-DC
converter
DIGITAL VIDEO
Defective RST IC
POWER SUPPLY No startup of 12 V
Cable disconnected
DIGITAL VIDEO
Panel having higher
temperature
Speaker short-circuited Speaker terminals
HD AUDIO Defective AMP IC
HD AUDIO Disconnection of cable CN4009 - CN3501
PDP-435PE
2
3
IC5401
IC4
3
IC5302
1
OR
RST2
2
IC5201
E_SCL
MODULE UCOM
E_SDA
TEMP1
Point to be Checked
IC4 BLOCK,
PANEL FLASH BLOCK
MODULE UCOM
BLOCK
PANEL IF BLOCK
HD AUDIO AMP Assy
DIGITAL DD CON
BLOCK
PANEL FLASH BLOCK
CN5202 - CN1071
Surrounding temperature
HD AUDIO AMP ASSY
3
4
IC5301
3.3V-RST
PANEL SENSOR
ASSY
IC5003
1.5V-RST
IC5206
EEPROM
TE1
D4
IC1072
4
TEMP.
SENSOR
Possible
Remarks
Defective Part
IC5401, IC5305
After turning the unit
on again, check if the
data on the version
can be read with the
GS1 command.
IC5206
IC4002
Check if the cable is
disconnected or not
securely connected.
Check if the 114-pin
ADY1081 FPC is broken or not
securely connected.
IC3502
Check if 3.3 V and 1.5
V are activated.
U5602
IC5301, IC5302,
IC5303
Shutdown occurs
when the sensor
temperature becomes
74°C or more (PDP-
435PE) or 74°C or
more (PDP-505PE).
Check if the speaker
cables are in contact
with the chassis, etc.
IC3504
Check if the cable is
disconnected or not
securely connected.
4