Philips FWD55, Service Manual

Page: 10 / 55

2-2
REPAIR INSTRUCTIONS ( MAIN UNIT )
2-2
A C E G I
K
MAIN UNIT REPAIR CHART 1/3
ALL FUNCTION
VFD DISPLAY
AND KEY
POWERSUPPLY
AUDIO LINE
DIGITAL LINE
DVD NO VIDEO
A
All f unction
No working
Checkall system
all cable is loos e
or bad INT
Panel stanby LED
show working or Not
RE-insert and fi x
the cable
Checkback power PCB
F901 bad cause damage
ChangeF901
CheckCN953
5V if right
Checkrepair control
PCB Standby circuit
Check+5V power
supply circuit
CheckRB102
Pin5=5V
Checkrepair switch
power circuit (about B)
Checkall Voltage
3.3V and 1.5V
give circuit
VCC=5V
VCC33=3.3V
VDD=1.5V
CheckIC106 Pin203
Pin186(osc
frequency 27MHz)
Repairmain pcb between
U107 to IC106
circuit
B
VFD display No show
and key function
Checkcontrol pcb
RB300,RB301cable
loose or bad INT
ChecktestRB300
Pin4=-24V Pin5=5V
Pin9,8=AC3.5V
Checktest RB301
Pin3/CLK,Pin4/DATA
and pin2/CE
CheckVFD control
PCB section bad
cause damage
RE-insert and fi x
the cable
Checkback power
PCB power supply
circuit
CheckIC106
AND IC300
C
Power supply
No working
All voltage
No output
CheckF901 bad
CauseDamage
ChangeF901
+12V No output
+5V No output
-27V No output
CheckD959 and its
conjoint part
CheckD960 and its
conjoint part
CheckD963 and its
conjoint part
YES
NO
NO
BAD
NO
YES
YES
WORK
NO
CHECK
CORRECT
YES
YES
YES
NO
NO
NO
NO
YES
NO
YES
YES
B
NO WORKING
NO SHOW
FUNCTION
NO WORKING
NO OUTPUT
NO OUTPUT
D F H J
USB FUNCTION
NO WORKING
MIC FUNCTION
NO WORKING
TUNER FUNCTION
NO WORKING
AUX IN NO SOUND
TAPE FUNCTION
NO WORKING