Ma In Unit Repair Chart; Repair Instructions - Philips HTS3548/51 Service Manual

REPAIR INSTRUCTION (Part One)
A B
Po wer Su pply
A ll F unctio n
No Wo rkin g No Wo rkin g
A
All function
No working
YES
Check all system
Re-insert and fix
all cable is loose
the cable
or bad INT
NO
NO
Pa nel stanby LED Check back power
show working or Not F901 bad cause damage
Check CN905 2pin
BK5V if right
Check repair control
WORK
PCB 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 OSC
3.3V and 1.8V
frequency 27MHz
give circuit
Repair main pcb between
IC202 IC206 IC208and IC602
circuit
2 - 1

MA IN UNIT REPAIR CHART 1/ 3

C E G
A ll F unctio n A udi o line IN
DVD A udi o
No So und No Ou tput
No So und
Power Supply
No working
All Voltage
No Output
BAD
Change F901
OK
NO
Check F 901
Check +5V power
supply circuit
Bad Cause Damage
YES
Check BK5V +5V
Working or Not
YES
H I
CO AX IA L In
MP 3 In
No So und
No So und
B
+35.5V Voltage
No Output
No -27V Voltage
No Output
+12V Voltage
No Output
YES
+5V Voltage
No Output
BK5V Voltage
No
No Output
No Check Repair IC901 IC902
And Its conn circui t
2 - 1
L
M O
T uner No So und No Sv ideo Output HD MI No Ou tput
C
All Function
Check Q901 Q909 IC901
And Its Conjoint Part No Sound
Yes
Check POWER IC
Check Q912 IC902
And Its Conjoint Part Voltage + 35.5V
OK
Check Q912 IC902 Check Q305 C
And Its Conjoint Part Voltage 3.3V
OK
Check Q912 IC902
Check Q902 C
And Its Conjoint Part
Voltage 3.3V
OK
Check IC505 51PIN
Check Q912 IC902
And Its Conjoint Part HIGH(3.3V) OR LOW(0V)
Yes
Check IC501 IC502 IC503 IC504
And Its Conjoint Part
P Q
No CVBS Ou tput No Y Pr Pb ou tput
No
See Contents B
No CheckQ306 D304 ZD303
And Its conn parts
No CheckQ902 ZD905 IC505
And Its conn parts
LOW CheckQ501 Q502 IC505
And Its conn parts