XOCECO LC-19HU26, Service Manual

4 

BACK LIGHT 

FF 

Software auto preset according the screen 

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   

EEPROM-MEMORAY 

RECALL 

> 

EEPROM Initialization (operate when EEPROM data chaos) 

 
3.2 Adjustment for AFT voltage and AGC voltage of IF channel in TV 
3.2.1 IF AFT adjustment 

Disconnect J1(B face), input 38.9MHz PAL signal of 80dB from 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 wed J1.   
3.2.2 IF AGC adjustment 

Input 184.25MHz RF signal (PAL/BG) of 60DBuv from RF terminal, adjust R64 to value 4V of 

TP4 and there should be no obvious snowy picture. Increase the signal to 90DBVuv and it should 
be display normally and no obvious noise. 
3.3 White balance adjustment 
3.3.1 VGA white balance check   

a.  Input VG-848 signal of VGA: TIMING854(800* 600/60Hz) (PATIERN: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, set ALL COLOR to 0 and fine adjust according the method of 3.3.2 
3.3.2 VGA white balance correct 

a. Input VG-848 signal to VGA: TIMING854(800*600/60Hz) 8 level gray scale of PAT920, 

adjust the balance with CA210. 

b.  Enter COLOR TEMP sub menu and select color temperature of standard(9300K) 
c.  Fixed B GAIN, adjust R GAIN, G GAIN to let the color coordinate of the seventh level be 

285,293; Fixed B OFF, adjust R OFF, G OFF to let the color coordinate of the second level be 
285,293 and the brightness be 3nit ~10nit or so. Repeat adjust R GAIN, G GAIN, R OFF and G OFF, 
until the two color coordinate of the level gray scale be 285,293. 
3.3.3 YPbPr/AV white balance check and correct 
    a. Connect VG-848 signal of YPBPR to YPBPR terminal and input TIMING972(1080i/60HZ) 
color bar of PAT908(include black/white bar), Enter submenu of ADC ADJ, Select AUTOTUNE and 
wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL 
COLOR to 0 and fine adjust according the method of 3.3.2 b, c. 

b. Input AV signal(PM5518, 8 gray levels) to VIDEO terminal, check if the white balance is 

normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.3.2 b, c.     
Note: it can’t set back to 1 once ALL COLOR changes to 0. 

4 Software upgrade   

When software upgrading please enter factory menu first, enter 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 web JB2 of 01S board. Please disconnect JB2 again after 
upgrading.