Thursday, September 03, 2015

SANYO LED-DP40142 SERVICE MODE AND AUDIO AMPLIFIER CIRCUIT

SANYO BLU RAY

SANYO LED-DP40142 

LED TV

SERVICE MODE AND AUDIO AMPLIFIER CIRCUIT   

Adjustment instruction
At any input source then press the
“< ”, “EXIT” and “OK” (Remote control) to enter factory mode
During Factory menu, if “MENU” key is pushed, system will exit factory mode.

Items of Factory menu
When in Component/ Video (Composite)/ ANT inputs then press the “Left -> Exit -> OK” key of remote control to enter factory mode..
During Factory menu, if “MENU” or “EXIT” key is pushed, system will exit factory mode.
Press up and down key can move high light item from Color Temperature -> Timer Clear -> Preset Channel- >NVRAM Clear-> Full Power -> Source Calibration -> Reset to Default -> RF Burn In -> USB F/W Upgrade -> UART Enable-> Bypass Gamma.
The Timer Clear, NVRAM Clear and Reset to Default items will have a check dialog “yes or no” to do or not. Push “Enter” key can select high light item function. (Press left and right can adjust value)
Display panel Burn in Time on the bottom.
Display model name, firmware version and released date on top.
1) Factory Color Temp data edit
This is used for Factory adjusts color temperature. Don't change this value.
2) Timer Clear
Reset the timer which records hours of LCD panel burn in (Don't clear timer after FW update.) This item will have a check dialog “yes or no” to do or not.
- Time in factory mode: Time function shall be displayed automatically. Saving the total time of system power on (LCD turn on), and count the time automatically. The timer is continuous and saved (per 60 minutes) forever, unless it will be reset by doing “Timer Clear”.
3) Preset channel
Load preset channel for production line.
4) NVRAM CLEAR
Initialize program’s default values to NVRAM for following adjustment items accuracy.
In factory mode it is the first and important step to make sure all values are default value and correct
- Reset settings: Gamma table, Channel table (Favorite channel, Channel label etc.), Model table (H/V Position, Clock, Phase), Source dependent setting (Contrast, Brightness etc.), Common setting (Volume, Language etc.), Parental Control (Rating, Password etc), Closed Caption. To avoid a mistake initial process after factory setting is done. This item will have a check dialog “yes or no” to do the initial or not.
Notice: After this item is processed then the DUT needs to be powered off then AC powered off.
5) Full power (For factory test only)
This is for power consumption testing.
To measure the maximum power consumption of TV set, we adjust the value of following items to maximum.
- Video: Contrast maximum value, Brightness maximum value, Backlight maximum value.
- Audio: Volume maximum value, Bass default value, Treble default value.
Press enter key to turn on Full Power and OSD stay display until press enter key to recover from Full Power
6) Source Calibration (For factory used only, don't do it without correct machine).
Source Calibration (gain/offset) must be adjusted color by firmware automatic adjustment in PC, and Component input source. This item will have a result dialog “OK” or “NG”.
7) Reset to Default
Reset all settings of OSD menu to default value.
- Reset settings: Channel table, Model table (H/V Position, Clock, Phase), Source dependent setting (Contrast, Brightness etc.), Common setting (Volume, Language etc.), Parental Control (Rating, Password etc), Closed Caption.
- Please execute Reset to Default once after FW is upgraded.
8) RF Burn In (For factory test only)
Use “snow” pattern for burn in. Selected items are “On” and “Off”. While turn on burn in mode, firmware will automatically turn off “Auto power off” function. If there is no power supply suddenly, firmware will re-enter burn in mode automatically when power supply is back Pressed the “Power” key, firmware will automatically turn off burn in mode. Burn in mode: Source is “ANT/Cable" and channel is NTSC channel 3.
9) USB F/W Upgrade
- We don't recommend upgrade FW here. We recommend upgrade FW in normal power on status (not in factory menu), just plug in USB with correct FW file name. (Refer to item 7) Upgrade firmware through USB.
10) UART Enable (For factory test only)
Enable to communicate with Auto-Alignment system.
11) Bypass Gamma
For factory test value of gamma.
USB Software updated
(1) Insert the USB with the firmware which the file name is matched with the model name in factory mode.
(2) If system detects the same firmware file name, USB upgrade message would appear automatically.
(3) Press Left key to select “Yes”, and then press OK key to start the upgrading.
(4) Upgrading is starting, please wait for the progress finish.
(5) When the progress completed, please follow the instruction to remove USB and restart by AC off then on.
Working principle analysis of the TV
1. NTSC signals flow:
Antenna signal will be sent to tuner ENV56U05D8F,then Tuner will demodulate and output standard video signal TV-CVBS, and sound SIF signal. TV-CVBS will be sent to the master control IC ZR39748 for video decode, de-interlace and scaler, then output LVDS level drive for panel display. The sound IF (SIF) will be fed into ZR39748, after demodulating, pre-amplifying, bass adjusting and volume control, the sound signal will be transform into digital I2S signal and sent to digital amplifier TAS5707L.
2. Composite/Component signal flow
Composite signal and Component signal will be fed to ZR39748 to perform video decode, deinterlace and scaler, then output LVDS drive level for panel display. Audio signal from Composite/Component terminal via matched resistance is fed to ZR39748 to bass adjust and volume control, the sound signal will be transform into digital I2S signal and sent to digital amplifier TAS5707L.
3. HDMI signal flow
Two HDMI video signals are directly fed to the master control IC ZR39748 to digital decode, image scale, then output LVDS drive level for panel display. HDMI audio signal via decoder built-in ZR39748 to bass adjust and volume control, the sound signal will be transformed into digital I2S signal and sent to digital amplifier TAS5707L.
4. USB signal flow
USB signal via USB connector sent to ZR39748 and its A/D conversion to YPbPr output for ZR39748, then output R/G/B of 24 bit to back end module to Video decode, de-interlace and image scale, then send to LVDS level drive for panel display.

TROUBLE SHOOTING 
Problem
Try these Solutions
NO POWER
Plug this LCD TV into the AC outlet.
Press POWER button on side control or on Remote Control to turn on LCD TV.
Check POWER Indicator. If this indicator blank, this TV has getting trouble.
Remote Control does not work
Check the batteries.
Make sure nothing is between the Remote Receiver and the Remote Control.
Make sure you are not too far from LCD TV when using Remote Control.
Maximum operating range is 5m.
Is direct sunlight or strong artificial light shining on LCD TV‘s Infrared Remote
Receiver? Eliminate the light by closing curtains, pointing the light in a different
direction, etc.
No image
Check the connection between the external equipment and LCD TV.
When turning LCD TV on, it takes a few seconds to display the image.
Check the system that you select is corresponding with the external equipment
or the video equipment.
Make sure the temperature is not out of the Operating Temperature (0°C ~
50°C).
Turn off power, then turn on again, re-start LCD TV.
No sound
Check Audio cable connection from Audio input source.
Adjust the Sound System.
Press VOLUME (+) button.
Press MUTE button.
There are tiny black points and/or bright
point on the TV

Dark or bright points of light (red, green, or blue) may appear on the screen.
This is a characteristic of the LCD panel, not a malfunction of the LCD TV.
LCD panel is produced with very high accuracy technology. There is 99.99% or
more dot pixel, but there is also 0.01 % or less of dot pixel lack or dot pixel that
is constantly lighted. This is not defect.
Regarding LCD panel characteristic, it may occur picture remain (look like a
mirror) when the screen is changed if it displays same screen for a long time.
Changing the picture or turn-off the power supply may recover.
Stripe pattern (more, interference stripes) may show up on the screen depends
on the reflected picture.
Abnormal
color of image
Adjust the value of color.
Select different color system.
AUDIO AMPLIFIER CIRCUIT 
CLICK ON THE IMAGE TO ZOOM IN