Philips 55PP9401 Service Manual page 54

Chassis Horizontal Phase (Coarse) Adjustment
Adjustment Pre paration
1. Video Controls: Brightness to 90%; Contrast to maximum.
Adjustment Procedure (Normal Mode)
1. Input an NTSC crosshair signal.
2. Set the screen format to Normal.
3. Press the Service Only switch on the Convergence board and display the digital convergence
crosshatch pattern.
4. Mark the center of the digital convergence crosshatch pattern with a small piece of tape, or
hold a finger at the center of the pattern.
5. Press the Service Only switch to return to Normal Mode.
6. Enter the I 2 C Service Menu, select item H POSI, and adjust the data value so that the center
of the video matches the marked location.
7. Exit the I 2 C Service Menu.
Adjustment Procedure (16 x 9 Mode)
Note: The I 2 C Service Menu cannot be entered in the 16 x 9 HD Mode.
8. Input any 1080i (2.14H) signal.
9. Change the screen format to 16 x 9 HD Mode.
10. Press the Service Only switch on the Deflection board and display the digital convergence
crosshatch pattern.
11. Mark the center of the digital convergence crosshatch pattern with a small piece of tape, or
hold a finger at the center of the pattern.
12. Press the Service Only switch to exit the digital convergence crosshatch pattern.
13. Turn the set's power off and back on, or change the screen format to Normal.
14. Enter the I 2 C Bus Alignment Menu and select item 9, H POSI.
Note: To enter the I 2 C Bus Alignment Menu with power off, press and hold the Source
button, then press and release the Power button.
15. Press the Select key on the remote control transmitter to change to HD Mode. The H POSI
option will change to H POSI H, so that the 16 x 9 Mode data values may be changed.
16. Adjust the data value slightly.
17. Exit from the I 2 C Menu.
18. Change the screen format to 16 x 9 Mode.
19. Confirm that the center of the video matches the marked location of the center of the
crosshatch determined in step 11.
20. If the horizontal position is not yet correct, repeat steps 8 through 19.
7618 Service Adjustments page 23