Electrohelponline: Samsung QLED TV QE49Q8* - how to upgrade the software, backlight test, how to enter the factory mode, replacing the main board and adjustments

Applicable to:

QE49Q8*, QE55Q8*, QE65Q8*, QE75Q8*, QE85Q8*

Project : Q7Q80D: Chassis: QWH00

TV POWER STANDBY TEST
Power TV On
POWER ON .2Vdc (when off) changes to 3.3Vdc (on)
Note: Will stay On for short time when powered off.
If voltage error or no change:
Jog Function & IR Control Test
If OK replace Main Board:
All 13V supplies for approx. 12.7VDC
If any wrong voltages, remove SMPS connector to Main Board:
All A13V again for 12.7VDC
All Vamp supplies for approx. 18 VDC
If OK replace Main Board:
If still wrong voltage replace SMPS:
OVD_LEVEL (Over Voltage Detect) 3.3Vdc : Operating Normal
If 0V or changing, an SMPS or Panel error exists. Perform Backlight Test.
Backlight On/Off : OV Off to 4.4Vdc On- If missing or error : Replace Main Board.
Backlight ON
Backlight On/Off 0V Off to 3.4Vdc ON (LD Board CN9003A)
Vdrv supplies to LD Board (approx 78V dc with multi meter)
SMPS/PANEL BACKLIGHT TEST
1. Activate Backlights Test : Disconnect Lead Cable from Main to Power supply.
TV Screen for active backlight LEDs.
2. If No BACKLIGHTS
Minus(Control) pins & Plus(Supply) pins voltages on the Panel connector. (with fine test probe on left side of connector only for safety)- If no pin voltages replace SMPS.
If BACKLIGHTS ON BUT PANEL SECTION(S) OFF
SIMPLE BL ERROR TEST:
Check each panel ribbon configuration.
If any have a different number of pins or a different pin or drive configuration do not perform this simple test go to additional backlight test.
If each have same number of pins and exact pin configuration.
Verify exact Panel Backlight error location (dark vertical line)
Turn off TV and Remove AC Power
Swap the two adjacent panel ribbons in that area
Reconnect AC Power and turn on the TV
Check location of defect (dark vertical line)
If the defect remained in the same location the panel is defective.
If the defect moved to another location the LD Board is defective (NOTE: In rare cases the Main Board may be
defective since it provides Local dim control.
BACKLIGHT DIMMING PROBLEMS
Go to Menu > Picture > Expert Settings > Backlight and vary level (0 ~ 50)
If no backlight changes observed :
Panel Connector minus (-) pin voltages and ANA-DIM voltages CNM801 while changing backlight level.
If minus(-) pin voltages don't change, and ANA-DIM changes, replace SMPS
If ANA-DIM doesn't change replace Main Board.
Use : MUTE > 4 > 1 > 9 > EXIT to test Panel Vertical Backlight Sections in normal operation mode.

Factory Mode

Factory Remote
1. Power TV ON.
2. Select TV Source.
3. Info → Factory.
4. Use MENU for return.

Samsung IR Remote
1. TV Power Standby.
2. Press as follows.

NTSC - MUTE > 1 > 8 > 2 > POWER

PAL - INFO > MENU > MUTE > POWER

Important items

Option (must set Option Bytes when replacing Main Board.)

Option → Factory Reset (returns TV to out of box condition. Does not reset Apps.)

SVC → Test Patterns
SVC → Info → ER Count (Important to check for errors.)
Control / EDID (Use to Reset HDMI Operational Errors)

Setting Option Bytes
1. Enter Factory Mode with Service Remote (only).
2. Check Option Byte Table located on GSPN (Fast Track or Tips).
3. Select Option
4. Select each item to change
5. Can Use new Writing Type to enter model (if entered wrong it will not change)
6. Soft power TV Off to load

Performing Factory Reset

1. Enter Factory Mode

2. Select Option / Factory Reset

3. TV will power off.

4. Perform ALL TV Settings (New out of box condition)

Replacing Main Board

When replacing Main Board, certain values needs to be manually input in Factory menu to complete the replacement.

Enter Factory Menu (Use Factory Remote only)

Power TV on: Select TV Source > Info/Factory > Option

Change each value according to the TV Model.

Type, Local Set, SW Model, BOM Model must be set to correct value.

Sample Model: QN85Q900RAFXZA

Check Panel label (located in the back chassis of panel) and choose same Type code from the list.

SVC > Test Patterns

1. Verify "Scaler Pattern" and "US Post Pattern".
2. Verify "FRC Pre Test Pattern".
3. Verify "FRC Post Test Pattern".
4. Verify "SoC TCON Test Pattern".

Factory Mode / Control / EDID (Restoring HDMI Inputs)

Remove ALL HDMI connections

Factory Mode/Control/EDID (Press Enter)

Select EDID/OFF to ON (Right Arrow Key)

Select EDID WRITE ALL (Enter)

Wait to Success (Right Arrow Key)

Confirm EDID WRITE ALL Success (Menu Key)

SVC > Info > ER Count

Check each item listed
IMPORTANT ITEMS
WD Count Watch Dog(Hardware related issue)
AR Count: Auto Reset(software (i.e. Apps) related
WiFi Count(Check all listed items)
BT Count(Check all listed items)
Serdes OCB Optical Cable Error)
AC-Over Voltage Detect(AC Supply related - New 2018)
VCC Fail Count(DC Supply related - New 2018)