AOC N32W551T 32 inch LCD TV – How to enter the service mode, power and audio output schematic, white balance adjustment

ENTER FACTORY MODE [How the enter the service mode]
After orientation OK, set Pattern104 (black picture) on Chroma225.Press 1-9-9-9 on remote to enter the menu on top left of the screen, this menu will show slowly), then from UP key △ option to enter the menu.

White Balance, Luminance Adjustment

Instrument List:
Chroma 2225、 VG848、 Chroma 7120
Adjustment Process:
Instrument Orientation
Connect LCD-TV、 Chroma 2225 and VG848, and set Timing137、 Pattern1 on Chroma2225. Chroma7120’s lens must aim at the center of Pattern1 showed on the LCD-TV’s screen. The distance of chroma7120’s lens and the center of screen is 20cm± 1cm.

ENTER FACTORY MODE
After orientation OK, set Pattern104(black picture) on Chroma225.Press 1-9-9-9 on remote to enter the menu on top left of the screen(refer to fig.1,this menu will show slowly), then from UP key △ option to enter the menu.

PC Mode White Balance Adjustment
Begin to adjust the W/B (White Balance) you should select the Color Temp(Warm and Cold) and enter the son menu from father menu “Scaler”
Set channel color temperature value and brightness on Chroma7120.Set 303 319 350(warm Temp) on CH3 and 278 289 350(cold Temp) on CH4.Press MODE key on Chroma7120 to switch xyY mode.
Use black sleeve on Chroma7120’s lens to ensure no external ray. Set Pattern104 on Chroma2225.Adjust SCALAR RB,GB,BB value to make sure the brightness is the lowest, then set Pattern105 on Chroma2225 and adjust RG,GG,BG value to make the value displaying on Chroma7120 is about 100.Press “Save” to save. Switch to CH4, select cold Temp and then adjust it according to above method. Press “Save” to save.

SMPS schematic [Circuit diagram]

Audio output - schematic

AV MODE W/B ADJUSTMENT
Begin to adjust AV/COMPONENT YPbPr (480I/576I)/COMPONENT T-scaler (480P/720P/1080I) /HDMI W/B, their Color Temp modes.

1.OFFSET(26%) W/B ADJUSTMENT(This is only for AV/TV)： Change the input signal to 26% white level performance .Set the CHROMA7120 to 288 301 30 and MODE_RGB ,then adjust the TV’s RB、 GB、 BB to make  CHROMA7120 display to 100.
2.W/B ADJUSTMENT (100%): Change the input signal to 100% white level performance. Set the CHROMA7120 to 288 301 415 and MODE_RGB , then adjust the TV’s RG、 GG、 BG to make CHROMA7120 display to 100.
3.Save the adjustment. Then change the input signal to 26% white level performance. Set the CHROMA7120 to MODE_RGB and CH3, check whether the color temperature was in SPEC (color spec is x± 15;y± 15;Y± 15). In this time, most of the TV is in SPEC, while the others should be adjusted twice or more to make its color temperature in SPEC.
4.CHECK CUT OFF: Change the input signal to 0% white level performance. Firstly, press the “brightness” from 50% to 0% and make sure the Y is not changed. Secondly, change the input signal to 32 GRAYS performance and make sure the grays is not connected at any position.( as the 5% level is between the first gray and the second gray. 5%=（ 1/32） *1.6。 )
1.The white color temperature in PC Mode should be app.7200K(CIE1931: x=0.303, y=0.319， Y>350), 10300K(CIE1931 : x= 0.278, y= 0.289, Y>350 ).
2.The white color temperature in AV/TV Mode should be app. 8700K(CIE1931:x=0.288±15, Y=0.301±15, Y>370). In this Mode, we should check the black balance, which level is 26% of the white level(1.0Vpp).
3. The white color temperature in HDTV/HDMI Mode should be app. 8700K(CIE1931:x=0.288±15, Y=0.301±15, Y>370)
Those three channels should be factory preset and not be possible to be modified.
The measurement position is the center of the dis1.OFFSET(26%) W/B ADJUSTMENT(This is only for AV/TV)： Change the input signal to 26% white level
performance .Set the CHROMA7120 to 288 301 30 and MODE_RGB ,then adjust the TV’s RB、 GB、 BB to make
CHROMA7120 display to 100.
2.W/B ADJUSTMENT (100%): Change the input signal to 100% white level performance. Set the
CHROMA7120 to 288 301 415 and MODE_RGB , then adjust the TV’s RG、 GG、 BG to make CHROMA7120 display
to 100.
3.Save the adjustment. Then change the input signal to 26% white level performance. Set the CHROMA7120 to
MODE_RGB and CH3, check whether the color temperature was in SPEC (color spec is x± 15;y± 15;Y± 15). In this
time, most of the TV is in SPEC, while the others should be adjusted twice or more to make its color temperature in
SPEC.
4.CHECK CUT OFF: Change the input signal to 0% white level performance. Firstly, press the “brightness” from
50% to 0% and make sure the Y is not changed. Secondly, change the input signal to 32 GRAYS performance and
make sure the grays is not connected at any position.( as the 5% level is between the first gray and the second gray.
5%=（ 1/32） *1.6。 )
1.The white color temperature in PC Mode should be app.7200K(CIE1931: x=0.303, y=0.319， Y>350),
10300K(CIE1931 : x= 0.278, y= 0.289, Y>350 ).
2.The white color temperature in AV/TV Mode should be app. 8700K(CIE1931:x=0.288±15, Y=0.301±15,
Y>370). In this Mode, we should check the black balance, which level is 26% of the white level(1.0Vpp).
3. The white color temperature in HDTV/HDMI Mode should be app. 8700K(CIE1931:x=0.288±15, Y=0.301±15,
Y>370)
Those three channels should be factory preset and not be possible to be modified.
The measurement position is the center of the display (5) at brightness set to center and
Contrast set to max. . The tolerance of the color coordinates should be less than ± 0.015 play (5) at brightness set to center and
Contrast set to max. . The tolerance of the color coordinates should be less than ± 0.015.