Samsung UN43TU8000F Chassis: UWK00-How to discharge the capacitors before repair, How to disassemble and power troubleshooting

 

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