Panasonic PT-60LCX64-K, Service Manual, Page: 103 / 279

VCOM ADJUSTMENT (PT-43LCX64/
50LCX64)
Purpose:
To set the optimum LCD common voltage.
Symptom of Misadjustment:
The picture will be flickering.
Test Pattern Signal:
•
70 % Red Horizontal Signal: "2 Red 70 %" in "2 Horizontal" of "3
Phase"
• 70 % Green Horizontal Signal: "3 Green 70 %" in "2 Horizontal"
of "3 Phase"
• 70 % Blue Horizontal Signal: "4 Blue 70 %" in "2 Horizontal" of "3
Phase"
1. Connect the PC(2) to the RGB Input 1 Terminal with the
RGB Cable.
2. Set to RGB 1 mode by pressing TV/VIDEO key on the
remote.
3. Supply 70% Red Horizontal signal. (PC (2) output should
be 720p resolution (1280 x 720).)
Note:
A Desk Top PC with a video graphics card compatible
with 720p resolution must be used.
1. Select "Vcom R Adjust" in software (1) menu by 2( ), 8( )
key on the 10-key keyboard.
2. Adjust "Vcom R Adjust" by pressing 4( ), 6( ) key on
the 10-key keyboard so that there are no flicker on the
whole screen.
3. Supply 70% Green Horizontal signal.
4. Then, select "Vcom G Adjust" in software (1) menu.
5. Adjust "Vcom G Adjust" by pressing 4(
), 6( ) key on
the 10-key keyboard so that the flicker on the whole
screen becomes minimum and uniformity.
6. Supply 70% Blue Horizontal signal.
7. Then, select "Vcom B Adjust" in software (1) menu.
8. Adjust "Vcom B Adjust" by pressing 4(
), 6( ) key on
the 10-key keyboard so that the flicker on the whole
screen becomes minimum and uniformity.
9. After above steps, add 16 steps to the data of "Vcom R
Adjust", "Vcom G Adjust" and "Vcom B Adjust" by
pressing 6(
) key on the 10-key keyboard.
Note:
The picture will be flickering a little bit immediately after
data addition (This is normal).
10. Then, end the software (1).
TP
PC(1)/(2), Test Pattern Signal
or PC(1) with 720p video
graphics card
Refer to Description below
SPECIFICATION EQUIPMENT
ADJ.
Vcom R
Adjust
Vcom G
Adjust
Vcom B
Adjust
INPUT
(RGB Input 1 Terminal)
70 % Red Horizontal Signal
(RGB Input 1 Terminal)
70 % Green Horizontal Signal
(RGB Input 1 Terminal)
70 % Blue Horizontal Signal
CAUTION:
Be sure to complete the VCOM adjustment within 10
minutes after turing on the unit power.
If adjusting takes more than 10 minutes, wait for approx. 2
hours after turning off the unit power. Then, re-adjust.
CAUTION:
This method is for use with PC which has a 720p video
graphics card to output the Test Pattern Signal.
PT-60LCX64-K
103