Sunday, May 31, 2015

SANYO LCD-19XR7- LCD-20XR7 SERVICE MODE AND POWER SUPPLY CIRCUIT

SANYO BLU RAY

SANYO LCD-19XR7- LCD-20XR7 

LCD TV


SERVICE MODE AND POWER SUPPLY CIRCUIT 

SERVICE MODE
Connect all the boards according to wiring diagram, connect with power 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” continuously to exit.
Initialization
Enter factory menu, select “OPTION”, “EEPROM” and “HOTEL OPTION” sub-menu, adjustment of
items
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 auto preset according the unit
SIF PRESCALE  

02E

Software auto preset according the unit

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)

Adjustment for AFT voltage and AGC voltage of IF channel in TV
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.
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.
White balance adjustment
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
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.
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),
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.
Performance check
TV function
Enter searching menu
auto search, connect RF-TV terminal with central signal source and check
if the picture is normal, if there are channels be skipped. Check TXT and parental control.
AV, YPbPr terminals
Input AV/S, YPbPr/YCbCr HD signal, check if it is normal.
VGA terminal
Insert VGA terminal, input VGA format signal of 640X480@60 Hz and check if the display is normal.
check sound channel
Check the speaker of each channel.
other function check
Check the turn on/turn off timer, asleep timer, picture/sound mode, OSD, freeze/mute, stereo, ect.
POWER SUPPLY CIRCUIT 
CLICK ON THE IMAGE TO ZOOM IN