23
LC-22AD1E
4. Adjustment
(1) +B adjustment (R3717)
a) Receive the standard colour bar signal.
b) Connect a digital voltage meter to TP3722.
Adjust the voltage to 5.00V±0.02V using R3717 (trimming VR). Specified value: 5.00V±0.02V
Note: Since the reference voltage for all of the supply voltages is 5V, make sure you set the 5.00V
adjustment accurately.
(2) +B adjustment (R4525)
a) Receive the standard colour bar signal.
b) Connect a digital voltage meter to TP4531.
Adjust the voltage to 13.00V±0.05V using R4525 (trimming VR). Specified value: 13.00V±0.05V
Note: Since this is the reference voltage for the power supply for gradation, make sure you perform this
adjustment accurately.
(3) Counter-bias adjustment
• This adjustment minimizes the flicker on the screen.
• To set the COM BIAS shown on the first page of the adjustment
process, perform this adjustment at 50 Hz and 60 Hz,
respectively.
a) Refer to the previous item 2 on page 22 to Entering the
adjustment process mode.
The first page of the adjustment process, shown in the diagram
on the right (Fig. 3-1), will be brought up.
b) Select [G/A] on the second page of the adjustment process
using the cursor “(")” key, and press the “OK” key (Fig. 3-2).
(The second layer item appears.)
• Next, press the cursor ”(")” key twice, to bring up the third
page of the second layer (Fig.3-3).
• Select [G/A TEST PATTERN 1], on the third page.(In this
case, the set value should be [0].)
• Press the cursor “(û)” key repeatedly to set the value to
[14].(In this case, [14] is [dot reverse flicker pattern 2].)
• Press the “RETURN” key and the cursor “(')” key to return
to the first page of the adjustment process.
c) Select [COM BIAS 50] on the first page, using the cursor
“(')/(")” keys.
d) Press the cursor “(Û)/(û)” keys repeatedly. Stop pressing
it when the flicker on the screen is at the lowest level possible.
(In this example, the set value [COM BIAS 50] is [105].)
e) Next, select the first page, [COM BIAS 60], using the cursor
“(')/(")” keys.
Press the cursor “(Û)/(û)” keys repeatedly. Stop pressing
it when the flicker on the screen is at the lowest level possible.
(In this example, the set value [COM BIAS 60] is [108].)
WLD 26 VER 1.000 DTV VER
INCH SIZE 22
MODEL AD1E
ERROR NO RESET 0
1BIT_AMP ERR 0
PUBLIC MODE OFF
COM BIAS 60 100
COM BIAS 50 100
PAL TAMP 20
SECAM TAMP 20
AV AMP 20
TAMP L 160
Y READ VALUE
TAMP M 168
Fig. 3-1
First page of the first layer of the adjustment process
WLD 26 VER 1.000 DTV VER
12C DATA 000000000000
12C DATA WAIT
MSP
VPC
G/A
TUNER
FLI12310
DSP
DOLBY
DELAY
TEXT
OTHERS
Fig. 3-2
Second page of the first layer of the adjustment process
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