Samsung SM-A045 (Galaxy A04) – MT6357 Power IC

Product Description

Samsung SM-A045 (Galaxy A04) – MT6357 Power IC Hardware Solution

Samsung SM-A045 (Galaxy A04) is a MediaTek based smartphone and its power system is controlled by the MT6357 Power IC. This IC is one of the most important parts on the motherboard. In daily repair work, most dead or no-power problems in this model are related to the MT6357 power IC.

What MT6357 Power IC Does

The MT6357 power IC takes power from the battery and supplies correct voltage to all main sections of the phone. It provides power to the CPU, RAM, eMMC, display, backlight, camera, audio, and network circuits. When the power button is pressed, this IC starts the power-on sequence. If MT6357 is faulty, the phone will not turn on even with a good battery.

Common Problems in SM-A045

From practical experience, these problems are commonly seen when MT6357 is damaged:

Phone completely dead, no vibration or display

No response when pressing power key

Phone stuck on logo or restarting

Very low or zero charging current

MT6357 area heating quickly after battery connection

No display or no backlight

These faults usually happen after water damage, hard drop, charging short, or power surge.

How to Check MT6357 Power IC

First, check battery voltage. It should be around 3.8V to 4.2V. Then check the main power line (VPH_PWR). If battery voltage is present but the phone is still dead, MT6357 becomes the main suspect.

Using a DC power supply is very useful. If there is no current draw or unstable current when the power key is pressed, it usually indicates a power IC problem. Also check for short circuit near the power IC area with a multimeter.

Hardware Repair Solution

In some cases, reflow of the MT6357 IC works if the issue is caused by dry solder or loose joints. But this solution is temporary.

The permanent fix is MT6357 Power IC replacement. Remove the faulty IC carefully using proper hot air temperature. Clean the pads properly and place a new or reballed MT6357 IC. After soldering, check for short circuit before connecting the battery.

Always inspect nearby coils, capacitors, and resistors. Sometimes a small damaged component can also cause power failure or damage the new IC.

Important Precautions

Always remove battery before heating

Do not overheat the board

Use proper flux and tools

Confirm fault before replacing IC

Final Words

In Samsung SM-A045 (Galaxy A04), the MT6357 Power IC plays a major role in power-related issues. With correct diagnosis and careful replacement, most dead or no-power problems can be repaired successfully, unless there is CPU or memory damage.