Philips L04L Service Manual page 32

EN 32 5.
5.8.2
Power Supply
Set Not Working
Check Power
Supply Mains
Switch
Bridge Rectifier
Not Ok
circuit 6500
Ok
Check DC
voltage at
2505/2507
Ok
Check
Check
fusible
7512
resistor 3532
Figure 5-5 Fault finding tree "Set not working"
Set Does Not Start Up
Software
No
loaded?
Yes
Check
voltage
across 2552
Is Vbatt
approximately
140V
Yes
Check
voltage 2562
&2563
16V
Yes
Check 3V
across 2535
Yes
Check 6V
across 2535
Figure 5-6 Fault finding tree "Set does not start up"
L04L AA Service Modes, Error Codes, and Fault Finding
Check fusible
resistor 3510 &
circuit before it
Not Ok
Check IC7511 &
IC7531
Ok
Check other
Set able to fusible resistor
No
start-up and capacitor in
the circuit
Yes
End
E_14480_057.eps
Set Unable
to Start
Change
Fuse Blown? Yes
Fuse
Load
Software
Check Power
No
Supply circuit
No
Set able to Check Line
Yes No
Start Transistor 7405
Yes
End
E_14480_058.eps
5.8.3
Deflection
One Thin Vertical Line
Quick check:
•
Set in protection mode.
•
LED blinking with error "3".
One Thin Vertical Line
Deflection Circuit in
200mV to 30mV & V
approximately 500mV
190204
Replace transistor
Figure 5-7 Fault finding tree "One thin vertical line"
One Thin Horizontal Line
Quick check:
•
Set in protection mode.
•
LED blinking with error "2".
One Horizontal
Check all connection
and peripheral at
Deflection Circuit
Check transistor
(7451, 7523, 7543) at
Vertical Deflection Circuitry
Check Vertical
Deflection Circuit
170204
Figure 5-8 Fault finding tree "One thin horizontal line"
LED Blinking
Check all
connection and
peripheral at
place
Check
Line Transistor
7405
Is V between
Check Horizontal
BE
CB Yes
Thin Line
LED Blinking
in place
Replace transistor
Deflection
Circuitry
E_14480_059.eps
170204
E_14480_060.eps
170204