XOCECO LC-19HU56S, Service Manual

4 

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, for adjusting   

items see table 4. 

Table 4 sub-menu adjustment 

Items Preset 

Remarks 

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 to different status. 

SIF PRESCALE 

02E 

Software will preset the data according to different status.   

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 3.75 V

±

0.25 V 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. 

4.4 White balance adjustment 

4.4.1 white balance adjustment of HDMI 

a. Input VG-849 signal from HDMI: TIMING854 (800* 600/60Hz) and eighth-level gray scale 

signal of PAT920. Use color analyzer CA210 to adjust white balance. 

b. Enter submenu of COLOR TEMP, Select 9300k of color temperature 

c. Fix value of B OFF, adjust R OFF and G OFF, let the color coordinate of the second level be 

(285, 293) and the brightness be about 3nit-6nit. Fix value of B GAIN, adjust R GAIN and G GAIN, 

let the color coordinate of the seventh level be (285, 293). Adjust R OFF, G OFF, R GAIN and G 

GAIN repeatedly until the value of the two levels gray-scale are (285, 293).

4.4.2 VGA/YPBPR/AV white balance check and correct 

a. Connect VG-848 signal of VGA to VGA terminal: TIMING854 ( 800 x 600 / 60Hz) 

(PATTERN:CROSS) and auto adjust to full screen, then input PAT948 black/white signal, enter 

factory menu ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), 

check if the white balance is normal, if not, enter COLOR TEMP menu and set ALL COLOR to 0 and 

fine adjust according to the method of 4.4.1c)