Sanyo LCD 47XR8DA – How to enter service mode – adjustment procedure – 

Adjustment instructions - How to enter Service Mode - SMPS schematic

Unit adjustments
1Connect all the boards according to wiring diagram, then power on and observe the display.
2 Method for entering factory menu:
a) Press “SOURCE”, “2”, “5”, ”8” and “0” in turn to enter factory menu;
b) Press “CH+” and “CH-” to move the cursor to the adjustment page of the level one factory menu, then press ”OK” to enter;
c) Press “CH+” and “CH-” to move the cursor up and down;
d) Press “VOL-” and “VOL+” to adjust the item when the cursor move to a certain adjust item;
e) Press “MENU” to exit to the previous factory menu;
f) Press “EXIT” to exit the factory menu at any situation;
g) Press “OK” to enter the sub factory menu;
h) ADC ADJUST, ADC correction of VGA, Component channel;
i) W/B ADJUST, white balance adjustment;
j) POWER Mode, set the turn-on modes. Standby---standby when power on; Mem---memory; ForceOn---power on; ForceOn can be used for aging; set the “power mode” to “Standby” when preset ex-factory unless the client appointed it;
k) ISP Mode, ON---soft upgrading through VGA port with ISP device, OFF---DDC function of VGA; the setting will not be memory and will be “OFF” when power on again;
l) REST ALL, initialization of the factory and user data; after this item is confirm, the unit will restart and display the guiding image.
m) Factory Data Reset, factory data initialization (including white balance adjustment, ADC correction and other adjusted data);
n) Factory Channel Preset, preset the factory channel; please connect to the center signal source when operating; the present digital frequency is CH28 (529.5MHz), CH33 (564.5MHz) for Australia and CH45 (666MHz) for UK, if the signal changes, perform “DTV manual search” in “Channel” menu and the operation needs 15s or so.

o) MST Debug, the default is OFF. OFF---RS-232 should match the design criterion; ON--- it should be convenient for using exploitation tool to adjust. The setting will not be memory and will be “OFF” when power on again;

p) Backlight: adjust the backlight brightness, adjust the data and test the voltage of X804 pin2 (PWM), let the voltage to be the corresponding PWM voltage which the brightness is maximum. It will be preset and doesn’t need adjust.

q) SSC Adjust, adjust the frequency spectrum expand, it will be preset and doesn’t need adjust.

r) AUDIO Curve, adjust the sound curve, it will be preset and doesn’t need adjust.

s) Picture Mode, set the picture values of each channel. Normally, they are preset and needn’t adjust.

t) There is data in EEPROM after software upgrade, please perform Reset All before the first adjustment.

ADC correction in VGA channel

a) Switch to VGA channel.

b) Press” SOURCE”, then press “2, 5, 8, 0” in turn to enter the level one factory menu.

c) Move the cursor to “ADC ADJUST” and press OK to enter the sub-menu.

d) Input VGA signal (VG-848 Timing:856(1024x768/60Hz), Pattern:920 Gray 8 step(H)). Move the cursor to “mode”, press CH+ and CH- to select “RGB”, move the cursor to “AUTO ADC” and press OK to adjust automatically till complete

ADC correction in YPbPr channel
a) Switch to YPbPr channel.
b) Press” SOURCE”, then press “2, 5, 8, 0” in turn to enter the level one factory menu.
c) Move the cursor to “ADC ADJUST” and press OK to enter the sub-menu.
d) Input YPbPr signal (VG-848 Timing:978(483P), Pattern:984 SMPTE Color Bar). Move the cursor to “mode”, press CH+ and CH- to select “YPbPr(HD)”, move the cursor to “AUTO ADC” and press ENTER to adjust automatically till complete.
e) Input YPbPr signal (VG-848 Timing:978(483P), Pattern:984 SMPTE Color Bar). Move the cursor to “mode”, press CH+ and CH- to select “YPbPr(SD)”, move the cursor to “AUTO ADC” and press ENTER to adjust automatically till complete.

White balance adjustment

The default of color temperature of COOL is 12000K and the coordinate is (272, 278); color temperature of NORMAL is 9300K and the coordinate is (285,293), color temperature of WARM is 6500K and the coordinate is (313,329).

Adjustment steps

Before the white balance adjustment, please let the unit working at least 30 minutes and at a stable situation, use BBY channel of the white balancer CA-210.

a) Switch to HDMI channel;

b) Press” SOURCE”, then press “2, 5, 8, 0” in turn to enter the level one factory menu.

c) Move the cursor to “W/B ADJUST” and press OK to enter the sub-menu.

d) Input DVI/HDMI signal 1024X768/60Hz 16 step Gray (Timing:856, Pattern:921). Move the cursor to “MODE”, press CH+ and CH- to select “HDMI” or other HDMI channel, move the cursor to “TEMPERTURE” and press CH+ and CH- to select “COOL”.

e) Fix G GAIN, adjust R GAIN, B GAIN and let the color coordinate of the fourteenth scale be (272,278).

f) Fix G OFFSET, adjust R OFFSET, B OFFSET and let the color coordinate of the third scale be (272,278).
g) When adjusting, please keep the color temperature of high light to be X=272±5, Y=278±5 and the low light to be X=272±8, Y=278±8.
h) Move the cursor to “COPY ALL” and copy the data to the other channels.
i) Check if the color temperatures of NORMAL and WARM are up to the mustard (low light acceptable error:±8, high light acceptable error:±5), if not, adjust R-GAIN/ B-GAIN/ R-OFF/ B-OFF.
j) Check the color temperature of COOL, NORMAL and WARM of other channels (ANALOGTV, DVB-T, Video, YPbPr,VGA), if they are not up to the mustard then adjust and store the data separately.
k) The reference of adjustment rule is below:
B gun: lower B gun to increase X, Y coordinate data, while raise B gun to decrease the data.
R gun: raise R gun to increase X coordinate data, while lower R gun to decrease the data; (R gun adjustment will affect X and Lv slightly).
G gun: raise G gun to increase Y coordinate data, while lower G gun to decrease the data; (G gun adjustment will affect Y and Lv greatly)

Performance check

TV function

Connect RF to the center signal source, enter Channel menu → auto search, check if there are channels be skipped, check if the picture and speaker are normal.

AV/S-Video terminals
Input AV/S-Video signal, check if the picture and sound are normal.
YPbPr/YcbCr terminal
Input YUV signal (VG848 signal generator), separately input the YUV signals and check if the display and sound are normal at any situation (power on, channel switch and format convert, etc.)

Software writing and upgrade method with USB port
(1) Make sure the USB device is formatted as FAT32.
(2) Copy the program named Merge.bin to USB device.
(3) Insert the USB device to USB port of the unit, power on and select RF-ATV channel, begin USB upgrade after OSD disappear. It will display blue when read the data from USB device, while display red when write Flash. The flash must be pull out when display red. It will flicker in red and blue if the process of writing is abnormal.
(4) The method are not applicable to all the USB devices, try another one if a certain USB device is inapplicable.

Software writing and upgrade method with ISP writing-device

(1) Main board upgrade: connect a four-pin wire of the ISP writing-device to Debug port(X806) on the main board; Unit upgrade: connect VGA ports of the ISP writing-device and the main board, enter factory menu and set “ISP Mode” to “ON”.

(2) Using Mstar writing-tool on line, click “Connect” menu, if it displays “Device EN25B32“ as shown in fig2, the connection is success, if it fails, select “EN25B52” of “Device” manually and press “Connect” again.

(3) Click “Read” and select the file written (MERGE.bin)

(4) Click “Auto”, select “All chip” , “program” and other items

5) Press “Run” in fig4 to begin writing and there are two steps: Erase and Program.

(6) If the process of writing succeeds, it will display “Pass” near “Run”

7) Repeat step 2) and 5) to write the program to the other units without exit the ISP interface.

SMPS circuit Diagram