Philips 32PF9968/10 Service Manual page 15

5.7 Protections
If a fault situation is detected, an error code will be generated;
and, if necessary, the television set will go into protection
mode. Blinking of the red LED at a frequency of 3 Hz indicates
the protection mode. In some error cases, the microprocessor
does not put the set in protection mode. The error codes of the
error buffer and the blinking LED procedure can be read via the
Service Default Menu (SDM), or via ComPair.
To get a quick diagnosis the chassis has three service modes
implemented:
• The Customer Service Mode (CSM).
• The Service Default Mode (SDM).
• The Service Alignment Mode (SAM).
For a detailed description, see the "Customer Service Mode,
Service Default mode" and "Service Alignment Mode" sections.
5.8 Fault Finding and Repair Tips
Notes:
• It is assumed that the components are mounted correctly
with correct values and no bad solder joints.
• Before any fault finding actions, check if the correct options
are set.
5.8.1 NVM Editor
In some cases, it can be handy if one directly can change the
NVM contents. This can be done with the "NVM Editor" in SAM
mode. In Chapter "Alignments", Paragraph "Geometry", the
default NVM values are given.
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"
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 Does Not Start Up
Software
loaded?
Yes
Check
voltage
across 2552
Figure 5-6 Fault finding tree "Set does not start up"
5.8.3 Deflection
One Thin Vertical Line
Quick check:
• Set in protection mode.
• LED blinking with error "3".
190204
L04A AD 5.
Set Unable
to Start
Change
No Fuse Blown? Yes
Fuse
Load
Software
Is Vbatt
Check Power
approximately No
Supply circuit
140V
Yes
Check
voltage 2562
&2563
No
16V
Yes
Check 3V
across 2535
Yes
Check 6V
across 2535
Set able to
Yes No
Start
Yes
End
EN 15
Check Line
Transistor 7405
E_14480_058.eps
170204