Philips 26PF7521D, Service Manual

Page: 33 / 44

Alignments EN 33 LC4.41E AB 8.
8. Alignments
Index of this chapter:
8.1 General Alignment Conditions
8.2 Hardware Alignments
8.3 Software Alignments
Note: Figures below can deviate slightly from the actual
situation, due to the different set executions.
8.1 General Alignment Conditions
Perform all electrical adjustments under the following
conditions:
Mains voltage and frequency: 220-240 V / 50/60 Hz.
Allow the set to warm up for approximately 10 minutes.
Test probe: Ri > 10 M
Ω
; Ci < 2.5 pF.
8.2 Hardware Alignments
There are no hardware alignments foreseen for the IBO Zapper
module.
8.3 Software Alignments
With the software alignments of the Service Alignment Mode
(SAM) the geometry, white tone and tuner (IF) can be aligned.
To store the data: Use the RC button Menu to switch to the
main menu and next, switch to ‘Stand-by’ mode.
8.3.1 ADC Gain and Grey Scale Alignment
The table below shows a number of NVM settings used for
each model of TV set. Be sure to use the correct editor in the
SAM menu (NVM Editor or SC NVM Editor), because the first
one is used for the Hercules NVM, and the second one for the
SCALER (SC) part of the TV set.
Caution:
• Do not change the NVM settings without
understanding the function of each setting, because
incorrect NVM settings may seriously hamper the
correct functioning of the TV set!
• Do not change the Scaler NVM settings, as this will
hamper the DVI / HDMI functionality of the TV set!
• Always note down the existing NVM settings, before
changing the settings. This will enable you to return to the
original settings, if the new settings turn out to be incorrect.
Table 8-1 ADC gain and grey scale alignment
SDTV ADC Gain settings: Use the NVM Editor in SAM to set these values in
the Hercules NVM
Setting
Hercules NVM Address
(decimal value)
42PF5521D/10/12
42PF7521D/10/12
50PF7521D/10 (TBD)
NVM_ADC_GAIN_R 006 135
NVM_ADC_GAIN_G 007 185
NVM_ADC_GAIN_B 008 165
SDTV Greyscale settings: Use the SC NVM Editor in SAM to set these values
in the Scaler NVM
Setting
Scaler NVM Address
(decimal value)
42PF5521D/10/12
42PF7521D/10/12
50PF7521D/10 (TBD)
ADC_RED_OFFSET2 338 070
ADC_GRN_OFFSET2 339 070
ADC_BLU_OFFSET2 340 070
ADC_RED_GAIN 341 150
ADC_GRN_GAIN 343 150
ADC_BLU_GAIN 345 150
PC Greyscale settings
Setting
Scaler NVM Address
(decimal value)
42PF5521D/10/12
42PF7521D/10/12
50PF7521D/10 (TBD)
ADC_RED_OFFSET2 325 070
ADC_GRN_OFFSET2 326 070
ADC_BLU_OFFSET2 327 070
ADC_RED_GAIN 328 240
ADC_GRN_GAIN 330 240
ADC_BLU_GAIN 332 240
HD Greyscale settings
Setting
Scaler NVM Address
(decimal value)
42PF5521D/10/12
42PF7521D/10/12
50PF7521D/10 (TBD)
ADC_RED_OFFSET2 351 064
ADC_GRN_OFFSET2 352 075
ADC_BLU_OFFSET2 353 064
ADC_RED_GAIN 354 180
ADC_GRN_GAIN 356 180
ADC_BLU_GAIN 358 180