Philips FWD872/98 Servise Manual page 9

REPAIR INSTRUCTION
A B
ALL FUNCTION POWERSUPPLY
VFD DISPLAY
NO WORKING NO WORKING
NO SHOW
AND KEY
FUNCTION
A
All f unction
No working
Checkall syste m
YES
RE-insert and fi x
all cable is loos e
the cabl e
or ba d INT
NO
NO
Pan el stanby LED
Checkback power PCB
show working or Not
F901 ba d cau se da mage
YES
CheckCN953
5V if right
YES
Checkrepair control
PCB Stan dby circuit
WORK
Checkrepair switch
NO
CheckRB102
power circuit (about B)
Pin5=5V
VCC=5V
CHECK
VCC33=3. 3 V
VDD=1.5V
CORRECT
Checkall Voltage
CheckIC106 Pin203
YES
3.3V and 1.5V Pin186( o sc
freque ncy 27MHz)
give circuit
YES
Repairmain pcb betw een
U107 to IC106
circuit
2 - 1
MAIN UNIT REPAIR CHART 1/3
C D E
DIGITAL LINE
AUDIO LINE
NO OUTPUT
NO OUTPUT
VFD display No show
and ke y function
BAD
Checkcontrol pcb
Change F901
RB300, R B301cable
loose or ba d INT
NO
Check+5V power
supply ci r cuit
ChecktestRB300
Pin4=-24V Pin5=5V
Pin9,8= AC3.5V
Checktest RB301
Pin3/CLK,Pin4/DATA
and pin2/CE
CheckVFD control
PCB secti o n ba d
cau se da mage
F G
DVD NO VIDEO USB FUNCTION
NO WORKING
B
YES
RE-insert and fi x
the cabl e
NO
Checkback power
NO
PCB power supply
circuit
NO
NO CheckIC106
AND IC300
YES
2 - 1
H I
MIC FUNCTION
TUNER FUNCTION
AUX IN NO SOUND
NO WORKING
NO WORKING
C
Power suppl y
No working
+12V No output
NO
All voltage
+5V No output
No output
YES
CheckF901 ba d -27V No output
Cause Damage
YES
Change F901
J
K
TAPE FUNCTION
NO WORKING
CheckD959 a nd its
conjoint pa rt
CheckD960 a nd its
conjoint pa rt
CheckD963 a nd its
conjoint pa rt