Sanyo LCD-26XR7 Service Manual page 6

BACK LIGHT
ALL COLOR
ISP
NO STANDY
INIT VOLUME
INIT CHANNEL
INIT SRC
EEPROM-MEMORAY
RECALL
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.
28 Adjust according different screen
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
0 0: no unit upgrade on the assembly line
1: unit upgrade on the assembly line
00 01: turn on; 00: memory function of turn on; 10: standby
0-100 Volume of turn on
1-200 Channel of turn on
Source Source of turn on
> EEPROM Initialization (operate when EEPROM data chaos)
4