BD9397EFV IC Datasheet Pin Diagram

BD939EFV IC is used in the backlight driver circuit of Sony Bravia LCD TV. The operating voltage of this IC is 9 volts to 35 volts, Temperature - 35°C to 85°C. The PWM frequency of this IC is 500Khz. BD939EFV IC has 40 pins.

BD9397EFV IC Pinout Diagram Datasheet

The backlight voltage is output from six pins from pin 11 to pin 16 of the BD939EFV IC, three of which are Common, from which the required feedback voltage is produced for over-current protection. The supply voltage of the three backlight sticks is output from the other three pins.

Protection Pin of BD9397EFB IC

If there is a short circuit or open circuit in one or more LEDs from the LED stick of the Sony Bravia LCD TV backlight, the red light of the power indicator of this TV will blink six times. Then, the technicians will be interested in knowing the protection pin of this IC.

BD939EFV IC pin-37 is a protection pin; The name of this pin is LSP or LED Short Detection pin. In this case, I recommend changing the Sony Bravia TV's backlights if the red light blinks six times or flushing that error signal.

The pinout diagram of BD939EFV IC is revealed in the figure below.

BD939EFV IC pin configuration, BD939EFV IC Protection pin,
BD9397EFV IC Pin Data or Pinout Diagram

BD9397EFV IC Pin Functions Datasheet

1 - VIN - Voltage Input Terminal
2 - Fail  - Detection Terminal of Abnormality OPEN DRAIN
3 - REG9 - 9 Volts Output From Regulator
4 - NC - Not Connected
5 - N - Switching Output of DC to DC

6 - PGND - Ground of Power Supply
7 - CS - FET Output Current Detection Terminal of DC to DC
8 - OVP - Over Voltage Protection Detector
9 - M_DET - LED / Output Terminal
10 - A GND - Ground Terminal of Analog Section

11 - LED1 - Output Voltage for LED- 1  (Negative for Cathode)
12 - LED2 - Output Voltage for LED- 2 (Negative for Cathode)
13 - LED3 - Output Voltage for LED- 3 (Negative for Cathode)
14 - LED4 - Output Voltage for LED- 4 (Positive for Anode 1)
15 - LED5 - Output Voltage for LED- 5 (Positive for Anode 2)

16 - LED6 - Output Voltage for LED- 5 (Positive for Anode 3)
17 - STB - Control Terminal for Standby
18 - PWM1 - Pulse Width Modulation Signal Input Terminal For Backlight LED1 Dimming
19 - PWM2 - Pulse Width Modulation Signal Input Terminal For Backlight LED2 
20 - PWM3 - Pulse Width Modulation Signal Input Terminal For Backlight LED3 Dimming

21 - PWM4 - Pulse Width Modulation Signal Input Terminal For Backlight LED4 Dimming
22 - PWM 5 - Pulse Width Modulation Signal Input Terminal for Backlight LED5 Dimming
23 - PWM6 - Pulse Width Modulation Signal Input Terminal For Backlight LED6 Dimming 
24 - FAIL RST - Reset Terminal For Output Fail
25 - S6 - A terminal of the Constant Current Setting Resistor For Backlight LED-6

26 - S5 - A terminal of the Constant Current Setting Resistor For Backlight LED-5
27 - S4 - A terminal of the Constant Current Setting Resistor For Backlight LED-4
28 - S3 - A terminal of the Constant Current Setting Resistor For Backlight LED-3
29 - S2 - A terminal of the Constant Current Setting Resistor For Backlight LED-2
30 - S1 - A terminal of the Constant Current Setting Resistor For Backlight LED-1

31 - CP - Non-Reaction Time Setting Capacitor Terminal
32 - SS - Soft Start Time Setting External Capacitor
33 - FB - Feed Back- Error Amplifier Output
34 - RT - DC to DC Frequency Setting Resistor Connecting Terminal
35 - VREF - Voltage Reference For Analog Dimming Voltage Input (DC)

36 - LED LV - Terminal For LED Control Voltage Set
37 - LSP - Voltage Setting Terminal of LED Short Detection
38 - Fail Mode -  Change Terminal For Fail Function
39 - UVLO - Detection Terminal of Low Voltage Malfunction Prevention
40 - A GND - Ground Terminal of Analog Section

BD9397EFV IC is used in the backlight driver circuit of a Sony Bravia 32-inch LED TV. If the 6-times blinking problem occurs even after changing the backlight of the Sony Bravia 32-inch LED TV, you can watch the video tutorial below to learn how to solve it.


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