Philips HTS3548W/55 Service Manual page 8

REPAIR INSTRUCTIONS (part one)-Main Unit
A B
Power Supply
All F unction
No Working No Wo rking
A
All function
No working
YES
Check all sy stem
Re-insert and fix
all cable is l oose
the cabl e
or badINT
NO
NO
Pa nel stanby LED Check back power
sh ow working or No t F901 bad cause da ma ge
Check CN905 2pin
BK5V if right
Check repair control
WORK
PC B Standby circuit
NO
Check repair switch
Check RB901 1pin
power circuit ( See B)
+5V=5V
CHECK VCC=5V
VD33= 3.3V
VD18= 1.8V
CORRECT
Check all Voltage
YES Check IC208 Pin234 OS C
3.3V and 1.8V
frequenc y 27MHz
give circuit
Repairma in pcb betw een
IC202IC206IC208andIC602
circuit
2 - 2
MA IN UNIT REPAIR CHART
C E F
All F unction Audio line IN
Wireless
No Sound No Output
No Output
B
Power Supply
No working
All Voltage
No Output
BAD
Change F 901
OK
NO
Check F 901
Check +5V power
supply circuit
Bad Cause Damage
YES
Check BK5V +5V
Working or No t
YES
G H I
COAXIA L In
DVD A udio MP3 In
No Sound
No Sound No Sound
+35.5V Voltage
No Output
No
-27V Voltage
No Output
+12V Voltage
No Output
YES
+5 V Voltage
No Output
BK 5V Voltage
No
No Output
No
Check Repair IC 901 IC 902
And It s co nn circui t
2 - 2
1/3
L
M O
TunerNo Sound No Svideo Output HDMI No Output
C
All Functio n
Check Q901 Q909 IC 901
And It s Conj oi nt Part No S ound
Yes
Check PO WE R IC
Check Q912 IC 902
And It s Conj oi nt Part Vo ltage + 35.5V
OK
Check Q912 IC 902
Check Q305C
And It s Conj oi nt Part Vo ltage 3.3V
OK
Check Q912 IC 902
Check Q902C
And It s Conj oi nt Part Vo ltage 3.3V
OK
Check Q912 IC 902 Check IC 505 51P IN
And It s Conj oi nt Part
HIGH( 3.3V) ORLO W( 0V)
Yes
Check IC 501 IC 502 IC 503 IC 504
And It s Conj oi nt Part
P Q
No CVBS Output No Y Pr Pbou tput
No
See Contents B
No CheckQ306 D304 ZD303
And It s co nn part s
No CheckQ902 ZD905 IC505
And It s co nn part s
CheckQ501 Q502 IC505
LOW
And It s co nn part s