XOCECO LC-26HU36S, Service Manual

4 

BACK LIGHT 

28 

Adjust according different 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   

ISP 

0 

0: no unit upgrade on the assembly line 

1: unit upgrade on the assembly line   

NO STANDY 

00 

01: turn on;    00: memory function of turn on;    10: standby 

INIT VOLUME 

0-100 

Volume of turn on 

INIT CHANNEL 

1-200 

Channel of turn on 

INIT SRC 

Source   

Source of turn on 

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 AFC adjustment 

Disconnect J401(B face), input 38.9MHz PAL signal of 80dB from J401 near the socket, Adjust 

L404 to value 0.9V of TP402. Enter factory menu, adjust TDA4470 from BG to LL, input 33.9MHz 
SECAM signal of 80dB, adjust RP402 to value 0.9V of TP402, then wed J401.   
3.2.2 IF AGC adjustment 

Input 184.25MHz RF signal of 60DB from RF terminal, adjust RP401 to value 4V of TP404 

and there should be no obvious snowy picture. Increase the signal to 90DBV and it should be 
display normally and no obvious noise. 
3.3 White balance adjustment 
3.3.1 white balance adjustment of HDMI 

a. Input VG-848 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. Fixed value of B GAIN, adjust R GAIN and G GAIN, let the color coordinate of the seventh 

level be 285 and 293. Fixed value of B OFF, adjust R OFF and G OFF, let the color coordinate of 
second level be 285 and 293 and the brightness be about 3nit-10nit. Adjustment R GAIN, G GAIN, 
R OFF and G OFF repeatedly until the value of the two levels gray-scale be 285 and 293.

3.3.2 VGA/YPBPR/AV white balance check and correct 

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 3.3.1 

b. 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 

c. 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     

Note

: it can’t set back to 1 once ALL COLOR changes to 0.