Samsung UN TU7000F Series - Page 40

 TV POWER ON SEQUENCE TEST :
Simplied Version (without meter)
1. Verify Standby Light
9 If missing perform Standby Test / Function Test
2. Power TV On
9 Check Standby LED changes and TV Powers On
3. IfStandbylightwon’tchange(doesn’tturnofforash)
9 Check with both Remote & Function Control Power commands
→ If still no change perform Function test
→ If OK replace Main Board
4. If Standby LED Flashes and TV won’t power on
→ Disconnect Panel Cables from Main Board
→ Power TV On
9 Check TV Powers On (Audio OK / Backlight OK / No video)
→ If TV now Powers On replace Panel
→ If TV still won’t Power On replace Main Board
5. Verify Audio is OK & Backlights Turns On
→ If No Audio perform “Audio Troubleshooting” Test
→ If No Backlight perform “Backlight Test”
Extended Version
1. Power TV On
9 Power On/off (pin
8
) .2Vdc (when off) changes to 3.3Vdc (on)
NOTE
• There is a delay from PS-ON to off condition when the TV is powered off.
2. If voltage error or no change:
9 Check Jog Function Control Test
3. If OK replace Main Board.
9 Check All A13V supplies (12.7VDC) (pins
3 5 7 9
)
4. If any wrong voltages, remove SMPS connector to Main Board
9 Check A13V again (12.7VDC) (pins
3 5 7 9
)
→ If voltages are now OK replace the Main Board
→ If voltages are still wrong replace SMPS
5. Verify Backlight Turns On in Normal TV Operation Mode
• If No Backlight
9 Check BLU_PWM (pins
6
) Backlight On/Off & Dim Control: for approx. 0 (Off) to approx. 2.5Vdc (On) depending
on backlight dimming level.
→ If missing/Error replace Main Board
→ If OK perform backlight test
4-6
4. Troubleshooting