👉 Sony Bravia Led rojo enciende 6 veces [RESUELTO💯] Problema de parpadeo Electronica Nuñez👉❤️

Summary

In this video, the presenter demonstrates troubleshooting a common issue with a Sony Bravia TV, where it fails to stay on due to backlight problems. After identifying that the TV enters protection mode due to LED backlight failures, the presenter uses an oscilloscope to diagnose the problem. They provide step-by-step instructions on how to bypass the TV's protection mechanism using a resistor to ground the control pin. This method allows the TV to function without disassembling the screen further. The video concludes with confirming that the LEDs are working correctly, restoring full functionality.

Takeaways

• 🔌 The video demonstrates how to troubleshoot a common issue with a Sony Bravia TV that enters protection mode.
• 🔴 When powered on, the TV shows the Sony logo briefly, then turns off and flashes red in standby mode, indicating a backlight protection issue.
• 🔦 The problem likely lies with the backlight controller or one of the LED strips, but it is not necessary to disassemble the TV fully to resolve the issue.
• 📏 The creator uses an oscilloscope to check the return pulses from the LED strips, setting it to 2 volts per division and 500 microseconds.
• 📊 By measuring the return voltages from the three LED strips, the technician confirms that each returns a consistent 4 volts, ruling out damaged LED strips.
• 💡 The next step is to analyze the signals from the backlight controller, specifically checking the error detection and pulse communication.
• 🔧 The technician targets pin 31 on the controller IC, associated with the error line, to monitor the pulse response using the oscilloscope.
• ⚡ The problem is resolved by connecting a 10,000-ohm resistor between pin 31 and ground, eliminating the error pulse and enabling the backlight to stay on.
• 📺 After the repair, the backlight functions correctly, and there are no signs of faulty LEDs or dark spots on the screen.
• ✅ The video concludes with the technician verifying the TV works properly by connecting an HDMI source, showing that the screen displays as expected without further issues.

Q & A

What is the common issue being addressed in the video?

The video addresses a common issue with Sony Bravia screens where the backlight fails, causing the TV to enter protection mode and display a green color, followed by red standby light indicating the problem.

What does the green color on the screen indicate?

The green color on the screen indicates that the divider has been turned on and the TV is starting up.

What does the red standby light signify?

The red standby light signifies that the TV has entered protection mode, indicating a problem with the backlight.

What could be the possible causes of the backlight failure?

The possible causes of the backlight failure could be a faulty backlight controller, damaged LEDs, or a specific LED that is not functioning properly.

What is the purpose of eliminating the protection mode in the tutorial?

Eliminating the protection mode is intended to force the TV to turn on the LEDs, which might still be in good condition, thereby giving the TV some utility without needing to disassemble it further.

What is the first step the presenter takes to diagnose the issue?

The first step the presenter takes is to disassemble the TV and locate the backlight controller to diagnose the issue.

Why does the presenter suggest that disassembling the screen might not be necessary?

The presenter suggests that disassembling the screen might not be necessary because sometimes the issue is with just one LED, and the rest of the LEDs might still function correctly.

What diagnostic test does the presenter perform to check the LED strips?

The presenter performs a diagnostic test using an oscilloscope to check the return pulse from each LED strip to determine if any are damaged.

What do the three flashes on the screen typically indicate?

Typically, three flashes on the screen indicate that there is a problem with the TV's backlight, and it is entering protection mode.

What does the presenter conclude after checking the return pulse from the LED strips?

After checking the return pulse, the presenter concludes that the failure is not due to damaged LED strips since all three reference points of return voltage are showing 4 volts each.

How does the presenter determine the functioning of the backlight controller?

The presenter determines the functioning of the backlight controller by observing the signals on the data points of the integrated circuit, specifically looking at the clk, error, cp, pwm, and ddm signals.

What is the significance of the line CP in the context of the video?

The line CP is significant because it can indicate problems with the integrated circuit if there is an error in frequency or signal level, leading to the TV entering protection mode.

What is the solution the presenter applies to resolve the issue?

The presenter resolves the issue by connecting a resistor between pin 31 of the controller and the negative ground (chassis) to bypass the error signal.

How does the presenter verify that the LEDs are functioning correctly after applying the solution?

The presenter verifies that the LEDs are functioning correctly by checking for uniform lighting and connecting an HDMI signal to display a white screen, ensuring there are no dark spots or shadows indicating damaged LEDs.