Red Light Blinking 2-Times Solution For All Sony Bravia Smart Android LCD/LED TV | MT5566GQVT Protection Pin

Sony Bravia TV's red light is blinking 2 times, how to solve this problem? It is in this presentation. This solution applies to all Sony Bravia Smart Android LCD/LED TVs and provides some information about its Processor MT5566GQVT.

The red light blinking two-times problem on the Sony Bravia TV is an error signal; by this blinking signal, the TV processor starts to reveal a problem with the TV's hardware or software.

Sony Bravia Smart TV Red Light Blinking 2-Times - Solution

Sony Bravia TV red light flashing 2 times

Solution for TV Owners:

Any model of Sony Bravia LCD TV's red light blinking twice problem occurs for several reasons. If you are not a TV technician and the TV's power supply is external, you can collect an AC adapter from the same TV and connect it to your TV to see if the two-time blinking problem is resolved. If the problem persists, consult a qualified LED/LCD TV technician or Sony TV Service Center.

[ Get the Circuit Diagram PDF of RT8295AH IC of Sony Bravia TV here. ]

Solutions for TV Technicians:

• Unplug and Wait: First, unplug the TV from the power source and wait for about a minute. This will allow any residual power to dissipate and might reset some internal components.

• Measure with a meter whether the required voltage is properly output from the TV's AC adapter or SMPS circuit.

• Turn off the TV, then hold the red probe of the volt meter to the main positive supply output terminal; then switch on the TV, keep an eye on the meter screen, and see if the voltage drops during the TV starting time. If this condition drops one or more volts, check the filter capacitors and AC rectifier diodes in the SMPs circuit.

• If you are sure there is no issue with the power supply, then reset the TV.

• The red light blinking 2-times problem on Sony Bravia TV may be due to a TV operating system problem or software problem. In this case, the software can be updated via the TV software update option via WiFi or any other internet connection.

• However, the software problem occurs in very few Sony Bravia TVs, so if the red light blinks two times, the problem occurs on Sony Bravia TV; follow the instructions below to repair it.

(SM4186 IC Schematic Circuit- ClickHere)

How do you repair the Sony Bravia TV's red light that blinks two times?

If there is a short circuit somewhere in the circuit board of the Sony Bravia TV, if overcurrent follows, if there is an overload problem, if there is a low voltage input or output somewhere, in a word, if there is a hardware problem in the TV, the entire circuit of the TV goes into protection mode so that the components of the circuit board do not burn. When the TV is in protection mode, the red light blinks two times as an error signal.

It may also happen that none of those problems mentioned above occur anywhere on the circuit board, so it should be understood that there is a fault in the TV's protection system control circuit. Most of that protection circuit's components are inside the processor, and outside the processor is a resistive voltage divider circuit with two resistors connected in series.

A reference voltage (19.5V) is applied to one side of the series resistor, ground to the other, and a divider voltage is output from the middle; this divided voltage acts as a protection sense for the processor.

To check if the two resistors in the voltage divider circuit are damaged, find out where those two resistors are located on the board.

Sony Bravia Android TV Red Light Blinking Two Times

How do we find the Protection Pin of the MT5566GQVT and voltage divider circuit to repair the Sony Bravia TV 2-times blinking problem?

Many models of Sony Bravia TV use MediaTek processor, whose number is MT5566GQVT. This processor is a QFN or Quad Flat No-Lead Package processor, and its overload protection (OLP) terminal is located on the opposite side of terminal 1 (dot mark) indicated in the figure,

The voltage divider circuit will likely be close to this protection terminal. The two series resistors located near the protection terminal of the MT5566GQVT measure 19.5 volts on one side, which is the voltage divider circuit.

The figure shows a test point near R1, where I measured 19.5 volts with the meter. So, R1 and R2 are both voltage divider circuits. However, the values R1 and R2 are not written in it.

But I know the MT5566GQVT processor has a current of 2.31 Volts and 0.209 mA current going to the protection terminal, so according to Ohm's Law, the value of the total resistor should be calculated by current and volt. 

Ohm's Law R = V ÷ I  or  (R=V/I)
or R = 19.5 ÷ 0.209
or R = 93.30KΩ (Total resistance)

So, the total resistance of R1 and R2 is 93.3 KΩ. The protection terminal of MT5566GQVT requires 2.31 volts, so to get a 2.31 Volts output, we have to calculate the values of R1 and R2 according to the voltage divider formula. The voltage divider formula shows that R1 = 82KΩ and R2 = 11KΩ.

Voltage divider for Sony Bravia

So, to repair Sony Bravia TV's red light blinking 2-times problem, make an 82KΩ (R1) and an 11KΩ (R2) resistor in series, then connect its Vout to the protection pin of the MT5566GQVT Processor.

The Sony Bravia TV's red light blinks two times. To better understand, Watch the video below to repair it.

(Red Light Blinks 6 Times Problem Solution - [Sony Bravia TV] - Click Here )

Video - How to solve red light blinks 2-times