Philips 42PF9945 Service Manual page 30

8. Electrical Alignments
Index of this chapter:
1. General alignment conditions
2. Hardware alignments
3. Software alignments
4. Option settings
8.1
General Alignment Conditions
8.1.1
Start Conditions
Perform all electrical adjustments under the following
conditions:
•
Power supply voltage: 230 V_ac / 50 Hz (± 10 %).
•
Connect the set to the mains via an isolation transformer
with low internal resistance.
•
Allow the set to warm up for approximately 20 to 30
minutes.
•
Measure voltages and waveforms in relation to chassis
ground (with the exception of the voltages on the primary
side of the power supply).
Caution: never use heatsinks as ground.
•
Test probe: Ri > 10 Mohm, Ci < 20 pF.
a
ariable
SB +3.3SBSW
5.2
VOLTAGE ADJUST DIRECTION
UP
DOWN
Procedure:
•
See figure above.
•
The six potmeters influencing VSB, +3V3_VSB_SW, VCC,
D5V, 8V6, and VFAN are not critical for matching. In case
of doubt values can be checked versus mentioned
voltages.
•
The five potmeters VS, VA, VSET, VE, and VSCAN have
to be matched with the values displayed on the PDP-label.
•
Start with aligning potmeter VR8008 to adjust VS and then
respectively VR8010 (VA), VR8003 (VSET), VR8005 (VE),
and VR8004 (VSCAN).
sc s
ariable ariable ariable
cc D5
3.3 3.3 5.2
VR8001
PFC
VR8002
VSB
VR8011
+3V3_VSB_SW
Figure 8-1 Supply Alignment
Electrical Alignments
•
Use an isolated trimmer/screwdriver to perform
alignments.
8.1.2
Initial Settings
Perform all electrical adjustments with the following initial
settings (via the "Active Control" button on the RC):
1. To avoid the working of the lightsensor, set "Active Control"
to "Off".
2. Set "Smart Picture" to "Natural".
3. Set "Active Display" to "Off".
4. Set contrast to max (100).
8.2
Hardware Alignments
There are no alignments needed, except in case the PDP has
been exchanged or the PDP-supply has been exchanged. In
that case both must be matched.
e set
ariable
8 6 FAN
8.6 12
VR8008
VS
VR8010
VA
VR8009
VCC
VR8007
8V6
ALARM BOARD
VR8012
I2C OVP UVP
DV5
•
To double check, repeat whole sequence again, to check
the correct value.
8.3
Software Alignments
Put the set in SAM mode (see the "Service Modes, Error Codes
and Fault Finding" section). The SAM menu will now appear on
the screen. Select ALIGNMENTS and go to one of the sub
menus. The alignments are explained below.
FTP1.1E 8.
REMARKS
ariable per set
Fixed for all sets
VR8005
VE
VR8004
VSCAN
VR8006
VFAN
VR8003
VSET
CL 36532075_058.eps
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EN 89