SERVICE MODE [FACTORY MODE] AND ADJUSTMENTS
The method of entering
the factory menu is {SOURCE, 2, 5, 8, 0.}
- Press 1 to enter page1, the function is Cotez Feature Setting, to set LOGO, frequency etc,.
- Press 2 to enter page2, the function is Color Temperature Setting. The color temperature now is 12000.
- Press 3 to enter page3, the function is Auto Color setting, to set AUTO COLOR of each channel.
Write EEPROM N401, NA02,
NS01, NB06, NB15.
Main board adjustment
A. Connect X401 of main board and IR board,
insert 11-pin wire of power board to XB7, then the indicator light of IR board
should be red.
B. Press POWER on the remote control, now the
indicator light of IR board turns blue, test XB7 PIN1 to be 9V, PIN3 5V,
PIN5/PIN6 12V, PIN9 3.3V, LB04 3.3V, NS03 PIN2 1.8V, N404 PIN2 2.5V.
C. Connect PC and serial terminal, flash write
HDCP KEY.
TV board adjustment
IF amplifier adjustment
A. Base on 3.3 a), connect 6-pin wire of power
board and X04 of TV board, press POWER on the remote control, now the indicator
light of IR board turns blue, TEST PIN2 of X04 to be 5V, PIN4 9V, L07 3.3V.
B. Input +5V to TP1 and 0V to TP2, input 38.9m
IF signal to J1(use IF signal generator), adjust L10 to let X08 be 1.6V.
C. Input 0V to TP1 and +5V to TP2, input 33.5m
IF signal to J1(use IF signal generator), adjust RP01 to let X08 be 1.6V.
D. Joint the tuner J1.
Unit connect
adjustment
Connect the main
board, TV board, IR board, SCART connect board and keyboard.
Press POWER button on
the remote control, the indicator light on IR board turns blue, test X12 PIN1
of TV board to be +24V.
AGC adjustment
A. Receive 60dB signal of D-8 and test X07 with
DC voltmeter.
B. Adjust RP201 to let the data of voltmeter
just below 4.0V.
C. Input 100dB signal of antenna,
the picture should not no-synchronous or distortion; the color should not
disappear when input 30dB-40dB low signal and the picture should
synchronous and the sound normal.
VGA adjustment
Mode preset
Input VG-848 of VGA
signal(PATTERN 980:1 dot ON/OFF), select TIME877(720*400/70Hz), the TV will auto adjust to
full screen, or enter display menu to do auto correction.
Adjust TIME885(640*480/60Hz,TIME854(800*600/60Hz)
by using the same method.
VGA channel Auto color
Input VG848 of VISA
mode signal to VGA channel, enter factory menu of Auto Color Setting item,
select VGA and press enter to do Auto Color.
YPbPr Auto Color
Input a high
definition signal of VG-848, enter factory menu of Auto Color Setting item,
select YpbPr and press enter to do Auto Color.
AV Auto Color
Input FLUKE VIDEO
signal of PAL, select PATTERN of 100% Color bar, enter factory menu of Auto
Color Setting item, select VIDEO1 and press enter to do Auto Color.
SCART Auto Color
Connect SCART1 RGB
signal, input FLUKE signal of PAL system, PATTERN of 100% Color bar, enter
factory menu of Auto Color Setting item, select SCART1 and press enter to do
Auto Color.
Performance check
TV function
Connect RF-TV terminal
to the central signal source, enter the search menu à auto search, check if there is station
skipping, manual search, fine tuning, the output of earphone and speaker, the
picture are normal.
SCART/AV/S terminal
Input
SCART1(RGB+CVBS)/SCART2(CVBS+YC)/AV/S signal, check if the picture and sound
are normal.
AUDIO OUT/VIDEO OUT
terminal
Separate input signal
at the status of TV/SCART/AV/S, connect AUDIO/VIDEO OUT to the monitor and
check if the sound and the picture of the AUDIO OUT are normal.
SCART terminal
check the content of
SCART OUTPUT
Separate input signal
at the status of TV/SCART/AV/S, connect AUDIO/VIDEO OUT to the monitor, check
if the picture and sound of SCART1 OUTPUT are the picture and sound of TV when
input SCART1(RGB+CVBS) and check if they are normal; check if the picture and
sound of SCART2 OUTPUT are the picture and sound of the present signal when input
SCART2(CVBS+YC) and check if they are normal.
Check the function of
SCART INPUT
A. Connect SCART1 and
the signal generator after turn on, the TV should auto switch to SCART1 RGB or
SCART1 CVBS. Connect SCART2 and the signal generator after turn on, the TV
should auto switch to SCART2 CVBS or SCART2 YC.
B. SCART signal generator sends CVBS signal
(color bar and multi-burst) to SCART1, check if the picture is normal, the OSD
should be SCART1 VIDEO; the OSD should be SCART1 RGB when SCART1 signal switches
to RGB format.
C. SCART signal generator sends CVBS signal
(color bar and multi-burst) to SCART2, check if the picture is normal, the OSD
should be SCART2 VIDEO; the OSD should be SCART2 S-VIDEO when SCART2 signal
switches to YC format.
D. Disconnect SCART signal, the
unit should return to the present TV situation. {Note: the function is act
except VGA, YPBPR, HDMI.}
VGA terminal
Input VGA signal
(VG-848 signal generator), separate input VGA format signal of table 1 and
check if the picture and sound are normal after auto correction. If the image is interfered, press the auto adjust
button on the remote control again and check if it is normal.
