The LP8550 Chip and Its use in Repairing Backlight Issues on Macbooks and Macbook Airs
The LP8550 Chip – Macbook Backlight Common Failures
When it comes to MacBook and backlight issues, the LP8550 plays a very crucial role. This chip is a white-LED driver that has integrated boost converter and six adjustable current sinks. These current sinks can be controlled using PMW inputs or other compatible serial interface. Based on the LED driver voltage, the boost converter utilizes adaptive output voltage control. This is how the chip significantly minimizes power consumption by tweaking the voltage to the lowest settings possible.
To achieve a crisp, smooth and precise brightness on your Mac screen, LED outputs boast of 8-bit resolution and 13 bit PWM. In most computers, the chip allows for automatic PWM dimming at lower brightness values. A typical LP8550 chip incorporates safety features that will allow you to detect LED outputs with any short faults. In case of boost over current or low input voltage, the chip is turned off to protect your MacBook. A thermal de-rating function reduces the chances of overheating by reducing your backlight brightness when a certain pre-set temperature is reached.
LP8550 Chip and Its Role in Repairing MacBook Backlight Issues
A fried LP8550 can be such a major headache when it comes to backlight problems. If your Mac’s backlight starts acting strangely, flickering or even going completely off, the LED driver is always the main culprit. This is because the LED drivers control almost every aspect of lighting and display on your computer. Due to all these functions, the LP8550 chip is highly susceptible to a wide array of complications such as overheating, or variable voltage.
To combat these weaknesses, the LP8550 chip incorporates plenty of safety features. Some of these features include LED fault detection with both open and short detection. This fault detection feature protects your system from overheating in the LED strings. Since the internal temperature is continuously being monitored, the LP8550 actively reduces the brightness of your Mac’s backlight to significantly cut down thermal loading upon hitting a set trip point.
However, if internal temperatures soar above this threshold, both the boost converter and LED outputs are entirely shut down until things cool down a bit. The boost converter is shielded from being overloaded with higher currents. Normally, everything should be all right after a while, but if the temperatures and voltage hit peak levels, that’s the quickest way to damage the LP8550 chip in your MacBook Air. The great thing about the LP8550 chip is that it will always notify the system about any faults using the Fault pin and I2C register. This way, computer owners can tell if the chip is causing backlight issues with their MacBook and MacBook Air computers.
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