Discover effective repair methods for the Relife RL-304P 6-Port Mobile Charger. Explore solutions for SUNSHINE SS-304D, dead issues, and blast problems.
How To Repair 6 Port Mobile Charger
Problem 1: The charger is completely dead (no power)
How To Repair 6-Port USB Mobile Charger?
Step 1: Check Cable Wire.
Step 2: Check the bridge rectifier (KBP307). If it is shorted or open, replace it.
Step 2: Check the bridge rectifier (KBP307). If it is shorted or open, replace it.
⤳ Test the KBP307 rectifier using a multimeter in diode mode. Replace it if the readings are inconsistent across the pins.
Step 3: Check the main capacitor (400V, 47µF). If bulged or leaky, replace it. ⤳ Inspect the capacitors for bulging or leakage. If any of these symptoms are observed, replace the capacitors to restore smooth DC output.
Step 4: Test the PWM IC (LY9531). If it is faulty, replace the IC. ⤳ Test the PWM IC’s output and check if it’s oscillating properly. If the PWM control isn’t functioning correctly, replace the LY9531 IC.
Problem 2: The charger provides low or unstable voltage.
Repair Solution:
Step 1: Inspect the transformer for any signs of damage. If faulty, replace the transformer.
Step 2: Check the feedback circuit for defective components (like resistors or optocouplers). Replace any damaged parts.
Step 3: Verify the FP6296 IC for stable voltage regulation. If not working, replace the IC.
Problem 3: Charger ports not supplying enough current (slow charging)
Repair Solution:
Step 1: Test the boost section. Check for faulty MOSFETs or inductors. Replace any damaged components.
Step 2: Inspect the Schottky diode (SB10100L). If the diode is shorted, replace it.
Step 3: Check for issues with the power distribution circuit. If it isn’t delivering sufficient current, replace the relevant components.
Problem 4: Overheating during charging
Repair Solution:
Step 1: Inspect the power transistors and diodes for overheating or damage. Replace any overheated components.
Step 2: Ensure proper heating is in place and the charger’s ventilation is clear.
Step 3: Test the PWM controller (LY9531). If it’s driving the circuit too hard, replace it.
Problem 5: Charger display not showing correct voltage or current
Repair Solution:
Step 1: Check the TM1622 IC for proper functionality. If the readings are incorrect, replace the TM1622 IC.
Step 2: Test the XPD738 IC to ensure it is properly converting analogue voltage/current readings. Replace if necessary.
Step 3: Inspect the LCD connections and repair any loose connections or broken wires.
Problem 6: One or more USB ports are not charging.
Repair Solution:
Step 1: Inspect the USB port connectors for physical damage. Replace any faulty connectors.
Step 2: Test the power distribution circuit to ensure all ports are receiving proper voltage and current.
Step 3: Check the 30P45 IC for switching or voltage regulation issues. Replace the IC if needed.
Problem 7: Charger shuts down during operation
Repair Solution:
Step 1: Inspect the overload protection circuit for issues. If it triggers too early, repair or replace faulty components.
Step 2: Test the 22LTH9M IC for accurate current sensing. Replace it if it's causing improper shutdowns.
Step 3: Check for faulty capacitors in the power supply circuit. Replace any failing capacitors.
Problem 8: The Charger working but the display is blank
Repair Solution:
Step 1: Inspect the LCD module. If the display itself is damaged, replace the module.
Step 2: Check the connections between the TM1622 IC and the display. Repair any broken traces or loose connectors.
Step 3: Test the WLX 896 07 IC for display power control issues. Replace the IC if necessary.
Problem 9: The Charger produces a buzzing noise
Repair Solution:
Step 1: Inspect the transformer for loose windings. Tighten or replace the transformer if buzzing is caused by vibration.
Step 2: Check for loose capacitors or inductors. Secure or replace any loose components.
Step 3: Test the PWM controller (LY9531). If it is switching erratically, replace it.
Problem 10: Charger output fluctuates under load
Repair Solution:
Step 1: Test the voltage feedback circuit. Replace any faulty resistors or capacitors affecting feedback stability.
Step 2: Inspect the FP6296 IC for load regulation issues. Replace the IC if it is not maintaining stable output.
Step 3: Verify the Schottky diode (SB10100L) for reverse leakage. Replace the diode if it’s causing voltage instability.
problems and solutions should help troubleshoot and repair the ReLife RL-304P 6-Port USB Mobile Charger effectively.
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