XOCECO LC-32HU56S, Service Manual

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4
Fig-1 adjustment flow-chart
4. Adjustment instruction
4.1 Unit adjustments
Connect all the boards according to wiring diagram, then power on and observe the display.
Method for entering factory menu: press “INPUT”, “2”, “5”, ”8” and “0” in turn to enter factory
menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust
value items, press “MENU” repeatedly to exit.
Method for software upgrading: When software upgrading please enter factory menu first, select
ISP of OPTION, set ISP to 1 and you can begin to upgrade. After upgrade finished, it needs to set
ISP back to 0. If the picture can’t display when upgrading, it needs to solder JB1 on main board.
Please unsolder JB1 again after upgrading.
4.2 Initialization
Enter factory menu, select “OPTION”, “EEPROM” and “HOTEL OPTION” sub-menu, adjustment of
items to see table4.
Table1 sub-menu adjustment
Items Preset Introduce
HOTEL 0 1: HOTEL OPTION of factory menu is optional
0: HOTEL OPTION of factory menu is not optional
LOGO 1 1: display LOGO in no signal or turn on
0: no LOGO display
ADC PRESCALE 046 Software will preset the data according unit
SIF PRESCALE 02E Software will preset the data according unit
BACK LIGHT FF Software will preset the data according the type of panel
ALL COLOR 1 1: white balance of each channel auto offset based on the HDMI white
balance
0: white balance of each channel adjust the offset base separately
Note: don’t set ALL COLOR to 1after the offset adjustment, if you do so, the
adjusted parameter of each channel will recover to the parameter of HDMI.
EEPROM-MEMORAY
RECALL
> EEPROM Initialization (operate when EEPROM data chaos)
4.3 Adjustment for AFT voltage and AGC voltage of IF channel in TV
4.3.1 IF AFC adjustment
Disconnect J1(B face), input 38.9MHz PAL signal of 80dB to the pole of J1 near L11, Adjust L5
to value 1.25V of TP2. Enter factory menu, adjust TDA4470 from BG to LL, input 33.9MHz SECAM
signal of 80dB, adjust R71 to value 1.25V of TP2 then solder J1.
4.3.2 IF AGC adjustment
Input 184.25MHz(PAL/BG) RF signal of 60dBuv to RF terminal, adjust R64 to value 4V of TP4
and there should be no obvious snowy picture. Increase the signal to 90dBuv and it should be
display normally and no obvious noise.
Performance check
Preset ex-factory