How To Remove Inverter Protection? Complete IC Pin Details

In this guide, we’ll explore how to remove the protection from an inverter IC, with a focus on practical steps to bypass the protection. This process is useful if you’re dealing with an LED TV or another device that goes into protection mode, resulting in issues like blinking backlights or sudden shutdowns. Here’s a simple explanation on how to approach it.

Understanding Inverter Protection

Inverter ICs control the backlight in LED TVs, ensuring smooth operation. However, these ICs often come with a built-in protection feature to safeguard the circuit during electrical faults. Sometimes, this protection is triggered unintentionally, causing the device to malfunction. By adjusting the IC’s pins, you can disable or bypass this protection and get the device working again.

Steps to Identify and Remove Inverter IC Protection

1. Identify the IC Number: Before you can proceed, you need to find the exact IC number on your inverter board. The IC number is typically a combination of letters and numbers printed on the IC chip. Use the Ctrl+F function to quickly search for your IC number in a list of known ICs.
2. Follow the Correct Bypass Method: Each IC has a different method to disable protection. Once you’ve identified your IC number, follow the specific method to remove the protection. Below are some common methods based on IC models:

All IC Protection Remove Methods and Pin Details

SEM2005 Remove Protection

You just need to Short Pin No 1 from an 82K resistor to the ground. And check the Protection of the SEM2005 Inverter IC will be removed easily.

SEM2006 Remove Protection

The SEM2006 Protection Pin is Pin No 5. You Need to short this Pin to the ground.

SEM2105 Protection Pin

Short an LED from Pin number 1 to the ground.

SEM2107 Remove Protection

Short and LED from Pin No 21 to the ground and the protection will be removed from this IC.

SS1091ASN Remove Protection

Connect and LED from Pin No 19 to the ground.

TL5001 Remove Protection

Please Connect an LED from Pin number 5 to the ground.

TA9687 Remove Protection

Connect a 47K resistor from pin 12, Timmer Pin, to the ground

OZ9938 Protection Remove

Short the Pin No 3,6,7 to the ground Remove the grounding resistance to remove the OZ9938 Protection.

OZ960 Disable Protection

Just Short Pin No 2 to the ground and check surely, the protection will be removed.

OZ9970 Protection Remove

You need to connect the 1.8 to 2V to Pin number 4 and the protection will be removed.

OZ9966 Protection Pin

Connect the 10K-ohm resistor from Pin Number 15 to the ground.

OZ9937 Protection Pin

Short the resistor with from Number 14 Timmer Pin to the ground.

OZ9910 Protection Pin

Connect the 82k ohm resistor from Pin Number 6 to the ground

OZ964 Protection Pin

Pin 4 must have a voltage between 1.8 and 2 V.

OZ960 Disable Protection

Pin 4 must have a voltage between 1.8 and 2 V.

OB3316 Protection Pin

Connect and LED from Pin No 5 to the ground.

TL494 Protection Pin

Short the Pin No 1 and 16 to the ground and the protection of the TL494 IC, will be removed/bypassed. If haven’t worked, just sort the Pin No 4

KA7500 Protection Pin

Short the Pin 1 and 16 to the ground and the protection will be removed.

MP1038EY Protection Remove

Just Connect Pin 2 and 11 with each other and the Protection will b removed.

TA9687GN Protection Remove

If you want To remove the protection please connect the 47K Resistor from Pin 12 to the Ground.

Example: Removing Protection from OZ9938

For the OZ9938 IC, you’ll need to short Pins 3, 6, and 7 to the ground. If you encounter a grounding resistance, remove it, and the protection should be bypassed.

Troubleshooting Common Protection Issues

If your LED TV enters protection mode (such as the backlight blinking and then turning off), follow these steps:

1. Check for Protection Mode: Ensure the TV is actually in protection mode by observing its behavior. If the backlight turns on briefly and then shuts down, it’s a sign of protection being triggered.
2. Locate the IC: Open the inverter board and carefully locate the IC. Once you’ve found the IC number, refer to the table above or your IC’s specific documentation.
3. Perform the Bypass: Depending on the IC, short the necessary pins to ground or use a resistor or LED as described.

Precautions

• Always ensure the device is powered off and unplugged before working on the inverter board.
• Work in a static-free environment to avoid damaging sensitive components.
• Use appropriate tools like multimeters to test connections and ensure the changes have resolved the issue.

Conclusion

Removing the protection from an inverter IC requires attention to detail and knowledge of the specific IC’s pin configuration. By following these methods, you can troubleshoot and resolve issues caused by the protection mechanism. Whether it’s for a SEM2005, OZ9938, or another IC, these techniques will help you restore functionality to your LED TV or similar devices.