Alignments - Philips TC7.1U CA Service Manual

8. Alignments

Index of this chapter:
8.1 General Information
8.2 Factory Mode (Service Menu, Service Mode)
8.3 Alignment procedure
Note: Figures below can deviate slightly from the actual
situation, due to the different set executions.
8.1 General Information
Perform all electrical adjustments under the following
conditions:
• Power supply voltage: 120 V
• Connect the set to the mains via an isolation transformer
with low internal resistance.
• Allow the set to warm up for approximately 15 minutes.
• Measure voltages and waveforms in relation to correct
ground (e.g. measure audio signals in relation to
AUDIO_GND).
Caution: It is not allowed to use heatsinks as ground.
• Test probe: Ri > 10 Mohm, Ci < 20 pF.
• Use an isolated trimmer/screwdriver to perform
alignments.
8.2 Factory Mode (Service Menu, Service Mode)
For certain alignment procedures, you will need to enter
Factory Mode (Service Menu). See also figure on next page.
Note: All system data in Factory Mode of "Key 8" and "Key 9"
are not adjustable when servicing, otherwise, the set will work
abnormally.
8.2.1 How To Enter
1. Press and hold the VOLUME DOWN key tightly on the TV
until minimum level.
2. Then, while holding the VOLUME DOWN key, press the "0"
key three times on the remote control (RC).
/ 60 Hz (± 10%)
AC
Alignments TC7.1U CA
8.2.2 How To Navigate
• Press "UP (^) / DOWN (v)" cursor key on the RC to select
option.
• Press "LEFT (<) / RIGHT (>)" cursor key on the RC to
adjust or select option.
• Press "0-9", "CC", "SLEEP", "CLEAR", "MUTE" or
"PICTURE" on the RC as the shortcut key to access factory
menu. All changes in factory data will be saved in
EEPROM automatically.
A few special modes:
• Vertical Stop mode is used to confirm the screen voltage.
Press "GO BACK" key in factory mode and repress "GO
BACK" key to exit.
• White Balance Alignment mode: Press "OK" key on the
factory RC to cut off the I2C control from the CPU to other
ICs. This is only valid during automatic adjustment of the
white balance.
• Initialization of the EEPROM: In Factory Mode, press the
"CLEAR" button. After the screen display "ROM INIT",
press the ">" button to initialize the EEPROM. When the
screen displays "ROM INIT OK", the initialization is
completed.
• Factory Mode Initialization of the EEPROM: In Factory
Mode, press the "MUTE" button to initialize the "Factory-
Out" status:
– V-CHIP: "Off".
– Picture presets: "Sports".
– Sound presets: "Theatre".
– Volume: "30".
– Source type: "Cable".
– CC select: "CC1".
– CC Display: "Off".
– Video mode: "DTV".
– Language: "English".
– Format: "Normal 4:3".
– Time zone: "Eastern".
– Off Time: "Off".
– On Time: "Off".
– AVL: "Off".
– Virgin Mode: "On".
8.2.3 How To Exit
Press the "Ana/Dig" button to exit the Factory Mode.
8. EN 31