Applicable to: Samsung
LED TVs: UN43TU8000F, UN50TU8000F,
UN55TU8000F, UN65TU8000F, UN75TU8000F, UN85TU8000F
Before Removing SMPS
board, Discharge Capacitors
• 43 inches
You have to discharge the SMPS by
using service JIG across leads of Large Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
• If LED ON > LED OFF discharge is completed.
Then verify voltage is less than 10Vdc
across leads with Volt Meter.
Fig-50 inches
You have to discharge the SMPS by using service JIG across leads of Large
Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed. Then verify voltage is less
than 10Vdc across leads with Volt Meter.
55 inches
You have to discharge the SMPS by using service JIG across leads of Large
Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
• If LED ON > LED OFF discharge is completed.
Then verify voltage is less than 10Vdc
across leads with Volt Meter.
65 inches
You have to discharge the SMPS by using service JIG across leads of Large
Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed.
Then verify voltage is less than 10Vdc
across leads with Volt Meter.
75 inches
You have to discharge the SMPS by using service JIG across leads of Large
Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed.
Then verify voltage is less than 10Vdc
across leads with Volt Meter
85 inches
You have to discharge the SMPS by using service JIG across leads of Large
Capacitors as pictured below.
If LED ON -> LED OFF, Discharge is completed.
Then verify voltage is less than 10Vdc across leads with Volt Meter.
Discharge JIG
• If LED ON > LED OFF discharge is completed
Then verify voltage is less than 10Vdc
across leads with Volt Meter.
Disassembly
1. Push and hold down BLU connector
tab to release it’s panel lock connection.
2. Lift to release the lock tab on
upper left side of Board. (Step 4 will assist)
3. Locate a notch in insulation sheet.
(not all models)
1. Push and hold down BLU connector
tab to release it’s panel lock connection.
2. Lift to release the lock tab on
upper left side of Board. (Step 4 will assist)
3. Locate a notch in insulation sheet.
(not all models)
4. Use Open Jig in notch to help
release & smoothly slide SMPS to the Right. (While pushing BLU Tab &
Releasing Lock Tab)
Power Troubleshooting
FUNCTION/IR
Control Test
1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
Check LED 1.7Vdc (pin 14 ) and VCC for
5Vdc (pin 4 )
→ If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
Check Switch Operation activates on
screen display.
If missing:
Check KEY_INPUT1 (pin 11 ) change to 0V
with a command.
• If wrong voltage or no change:
Check Switch for stuck or
miss-operation.
5. Check IR (pin 10 ) operation with Standard Remote command changes. (5V to
3.3V effective DC)
6. Check SDA (pin 17 ), SCL (pin 15 ) for effective 5Vdc (after power on)
→ If missing suspect Function Assy/Cable Assy/Main Assy.
FUNCTION/IR Control Test
of Function/Wi-Fi /BT Module
1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
Check LED (pin 17 ) and VCC for 5Vdc (pin 7 )
→ If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
Check Switch Operation activates on screen display.
If missing:
Check KEY_INPUT1 (pin 11 ) change to 0V with a command.
• If wrong voltage or no change:
Check Switch for stuck or
miss-operation.
5. Check IR (pin 10 ) operation with Standard Remote command changes. (5V to
3.3V effective DC)
6. Check SDA (pin 14 ), SCL (pin 13 ) for effective 5Vdc (after power on)
→ If missing suspect Function Assy/Cable Assy/Main Assy.
Power supply board
(SMPS) connector voltages. – 43 and 50 inches
55 and 65 inches
75 and 85 inches
