Philips DVD634, Service Manual, Page: 22 / 54

Diagnostic Software, Trouble Shooting and Test Instructions
EN 22 DVD634 /0X1 5.
5.3.6 No RC and FTD Display
Figure 5-6 No RC and FTD display
Front board no function FTD
no display or Remote
control no function
Check Power
supply to Front
board
Put the Mains switch to ON
•
Check supply voltage at connector
1101
Pin 1
--> +5V
Pin 3 --> -30V ( VKK )
Pin 4 --> -20V ( VGL+1 )
Pin 5 --> -23V ( VGL-1 )
•
Check / Replace cable connection to
con 1101
•
Check / Replace Power Supply Unit
NO
Check IR signal
at pin 5 of con
1104 of Front Bd
with a Remote
YES
•
Check +5V to pin 2 of IR receiver
7101 on the Front board
•
Check / Replace resistor 3113.
•
Check / Replace IR receiver IC 7101
on the Front board
NO
Check VFD
controller grid
and segment
output
YES
•
Check +5V supply at pin 38/44 of
IC 7100 on Front Board
•
Check /Replace R3100 and R3102
•
Check VEE voltage at pin 27 of
IC 7100 -->
-25V
•
Check /Replace R3107
•
Check serial data input at pin 6/8/9 of
VFD controller IC 7100
•
Check / Replace VFD controller IC
7100 on the Front Bd
NO
YES
YES
Check filament
voltage VGL+1 &
VGL-1 to FTD
•
Check filament voltage at FTD
Pin 1/2 -->
-20V ( VGL+1 )
Pin 31/32 --> -24V ( VGL-1 )
•
Check / Replace R3101 and D6100
on the front board
•
Check / Replace FTD display 1100 on
the Front board
NO
•
Check pulses at pin 15/16 of VFD
controller IC 7100
•
Check / Replace diode D6102 and
D6103 on the front bd
•
Check / Replace VFD controller IC
7100 on the Front bd
Check local
keyboard key
functionality
NO
YES
END
CL 26532068_025.eps
100702
PM3380B
ch1
1 T
Pin 15
10V / AC
2ms / div
10V / AC
2ms / div
Pin 16
PM3380B
ch1
1 T
IR SIGNAL
1
ch1
2V / div DC
2ms / div