Philips DVD733 Service Manual page 23

Diagnostic Software, Trouble Shooting and Test Instructions
5.3.6 No RC and FTD Display
Front board no function FTD
no display or Remote
control no function
Put the Mains switch to ON
Check Power
supply to Front
board
YES
Check IR signal
at pin 5 of con
1104 of Front Bd
with a Remote
YES
Check VFD
controller grid
and segment
output
YES
Check filament
voltage VGL+1 &
VGL-1 to FTD
YES
Check local
keyboard key
functionality
YES
END
•
NO
•
•
•
•
NO
•
•
•
•
NO
•
•
•
•
NO
•
•
•
•
NO
•
Figure 5-6 No RC and FTD display
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
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
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
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
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
DVD733 /xx1 5.
IR SIGNAL
ch1
1
2V / div DC
2ms / div
Pin 15
PM3380B
ch1
1 T
10V / AC
2ms / div
Pin 16
PM3380B
ch1
1 T
10V / AC
2ms / div
CL 26532068_025.eps
100702
EN 23