DIY Series 103: Samsung WA88V4 Washing Machine Repair (Power Trip)

Samsung WA88V4 Washing Machine Repair (Power Trip)

Symptoms:

• Samsung washing machine causing power trip when power on.
• After replaced new motor, the motor (rotor) starts spinning immediately after power it on.
• Found that the motor is getting heat up immediately after power on, which is abnormal.
• There is definitely shorted somewhere, and the leakage current go thru the motor continuously and heat up the motor.

Findings:

• Found out that the washing machine was placed under an aircond outdoor unit, where water dripped directly onto the washing machine's control panel (near the place where Triac located), so somewhere on the main control board was shorted.
• After study online, looks like most likely caused by shorted motor Triac on the main control board.
• Since the original Triac (T835H-8F, JieJie Microelectronics) is difficult to get locally, I opted to buy compatible Triac, BTA16-800BW (ordered from TaoBao, by STMicroelectronics). Keyword is "Snubberless" Triac.

Part 1: Changing Motor & Capacitor

• DIY Series 87: Samsung WA88V4 Washing Machine Repair (Part 2 of 2) - Motor
• Since the motor at the above broken again (due to shorted Triac, motor overheated) after few months, this time I replaced a new motor and new capacitor as below:
• Samsung WAS165WTVA Motor (delivered without pulley)
• 6.3mm Cable Lug (for wiring to motor connection)
• 12mm Pulley (bought wrong size, modified to fit, better get 10mm Pulley)
• 8uF Capacitor (smaller in size, added some padding to hold it tight)
• After replaced new motor, the motor (rotor) starts spinning immediately after power it on. No more power trip when power on, but motor spin non-stop after power on.

Part 2: Debug Main Control Board & Changing Triac

• DIY Series 57: Samsung WA88V4 Washing Machine Control Board Malfunction
• This time, I take out the main control board and trying to check and replace the Triac.
• BTA16-800BW (bought from TaoBao)

Photos:

1. Open up the Control Panel to take out the Main Control Board
2. Remove the Main Control Board from Washing Machine
3. Cut the PCB housing where Triac is located
4. Identify the malfunction Triac (T835H) using multimeter
5. Remove both Triac (T835H) from the PCB (better use same Triac on board)
6. Solder new Triac (BTA16-800BW) onto the PCB (top view)
7. Solder new Triac (BTA16-800BW) onto the PCB (bottom view)
8. Reconnect the PCB housing and reconnect it back onto Washing Machine

Tools required:

• Screwdriver
• Mini Saw
• Multimeter
• Soldering Tools

Cost involved:

• Samsung WAS165WTVA Motor: US$30
• 6.3mm Cable Lug (10pcs): US$0.50
• 12mm Pulley: US$1.25
• 8uF Capacitor: US$1.60
• BTA16-800BW (6pcs): US$4 (include shipping from China)

Related Link:

• DIY Series 57: Samsung WA88V4 Washing Machine Control Board Malfunction
• DIY Series 86: Samsung WA88V4 Washing Machine Repair (Part 1 of 2) - Gear Mechanism
• DIY Series 87: Samsung WA88V4 Washing Machine Repair (Part 2 of 2) - Motor