Service Modes and Fault Finding
5.
be created in the USB with every operation of “Copy to USB”.
Folder names will automatically increase like CLONE00001,
CLONE00002, etc. (up to 99999)
Copy from USB
There are two steps and both are independent of each other. If
there is file named “hotel_wel.png” in directory
“welcome_image”. It is copied to TV to use as welcome image.
Copy from USB device data to NVRAM. Just the reverse
operation done by copy to USB call. Previously copied NVRAM
files (Flashx.bin) are copied into TV. If there is no flash file or
some of them are available on USB, the available ones are
copied. If no USB is connected, nothing happens.
Note:
For Clone function USB stick (Copy to USB - Copy from
USB) must be formatted to FAT32. If USB is not formatted to
FAT32 the other TVs will not accept cloned data and
performance issues will result
5.3.7
How to Edit S/N(Serial Number) & Model Number
Uploading Procedure To TV
Create “SerialNoModelNo.txt” file in an USB stick. Write the
informations below on this text file.
SerialNo: xxx
ModelNo: yyy
Then apply USB operations. Power on/off.
Downloading Procedure From TV
Create “DownloadSerialModelNo.txt” file in an empty USB
stick. Apply USB operations. After you applied USB operations,
“SerialNoModelNo.txt” file will be created automatically in the
USB stick.
5.4
Fault Finding and Repair Tips
Note:
•
It is assumed that the components are mounted correctly
with correct values and no bad solder joints.
•
Before any fault finding actions, check if the correct options
are set.
5.4.1
LED Blinking problem
When the front LED blinks it indicates that the SSB has gone in
protection mode. In the possibility of a short circuit, the LED
light will blink at a 1 to 2 Hz frequency. It will continue to blink
even after rebooting and until proper repairs are made. Check
the DC-DC sections of the SSB as well as the power supply
unit.
5.4.2
No Backlight Problem.
Backlight pin, dimming pin, backlight supply, stby on/off pin
“backlight_on/off” pin should be “high” when the backlight is
“on”. Q30 connector pin must be “low” when the backlight is
“off”. If it is a problem, please check Q30 and the panel cables.
Also it can be tested in TP7 in main board. See figure
B02, MEDIATEK Main IC, Keyboar 3 Way Switch
.
5.4.3
No Picture via HDMI input
Check if HDCP key is valid. This can be done in CSM.
5.4.4
TV Will Not Start-up from Stand-by
Possible Stand-by Controller failure. Re flash the SW.
5.4.5
CI Module Problem
Supply, supply control pin, detect pins, mechanical positions of
pins.CI supply should be 5V when CI module inserted. If it is not
5V please check CI_PWR_EN, this pin should be low. See
figure
10-4-1 B01, DVB-T/C - CI Interface - USB- Active
5.4.6
Loudspeakers
Make sure that the volume is set to minimum during
disconnecting the speakers in the ON-state of the TV. The
audio amplifier can be damaged by disconnecting the speakers
during ON-state of the set!
5.4.7
Display Option Code
This chassis does not use display option codes.
5.4.8
Staying in Stand-by Mode
This problem indicates a short on V
CC
voltages. Protect pin
should be logic high while normal operation. When there is a
short circuit protect pin will be logic low. If you detect logic low
on protect pin, unplug the TV set and control voltage points with
a multi-meter to find the shorted voltage to ground.
5.4.9
IR Problem
Check LED card supply on MB82S chassis.
5.4.10
No Signal Problem
Check tuner supply voltage; 5V_VCC, 3V3_TUNER and
VDD_1.8. Check tuner options are correctly set in Service
menu. Check AGC voltage at IF_AGC pin of tuner.
5.4.11
Remote Control Incompatibility
This TV set requires the original remote control that it was
shipped with. Only the original remote control guarantees full
compatibility and operation and a healthy service operation.
