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Sony Bravia 55XE90 KD-55XE9005 Teardown VR Damage

Published on Wednesday 15 January 2020
Categories: Electronics |

VR Damage Sony TV

Last week my 55 inch Sony Bravia KD 55XE9005 LED HDR 4K Ultra HD Smart Android TV suffered an unfortunate accident with a friend who was playing Richie's Plank Experience on my Oculus Rift. While playing one of the bonus levels she ran across my room and straight into the TV while trying to get away from a virtual bus.

At first we thought the only damage to the screen was only scuff marks which wiped off with some glass cleaner but after powering on the TV, I found the full extent of the damage with the centre part of the display not working and a large crack across the lower part of the screen as you can see on the photo below.

Broken Screen

As the television was now dead and a replacement panel didn’t appear to be available to repair it, we decided to strip it down to see what you get inside a £1000 LED HDR 4K Ultra HD Smart TV before taking the bits to the local recycling centre.

The Teardown

The back cover was held on with cross head screws around the edges and middle.

Back Panel

With the rear plastic cover removed it revealed the circuit boards and mounting brackets on the back of the TV. At the base of the TV are a pair of slimline speakers and between these are three small PCBs, one with an infrared receiver and the second with a WiFi module and antennas and a third with a single IC which we haven’t been able to establish what it does.

Above this is the display driver board and in the centre of the TV panel is a large PCB which is the LED backlight driver.

On the left of the TV is the power input board which uses a DC socket from an external 19V power supply, and this board has input filtering capacitors and inductors.

The right side holds the main input and processing circuit board which has a small RF input daughter board fitted into the lower edge.

Cover Removed

After removing the circuit boards and cables you are left with the display panel and wall mounting bars which are held together with several small screws. The edge of the screen has plastic and metal bezel which is held on with more small screws. The display panel part number was: YD7S550DND01B A2187580A.

PCBs removed

Removing these screws allows you to lift the LCD panel away which revealed the damage from the VR impact. The LCD panel has two long PCBs at the bottom which connect via flat flex to the screen and two connectors to connect to the display driver board.

Sony TV crack

Sony TV LCD Panel

Under the LCD panel are several layers of light diffusing material comprising of a Reflective Polarizer, Prism Sheet, Diffuser plate and Reflective sheet.

Diffuser

Under these are the backlight LEDs with a white reflective layer of plastic which is taped down along the edges.

Sony TV LED backlights

The LED strips are mounted onto aluminium strip PCBs and these are held to the metal chassis using double sided tape.

LED Strips

The glue holding the LED strips onto the back-metal panel was softened using a hair dryer and this allowed us to remove the LED strips from the TV.

Removing the LED Strips

Circuit Boards

All board locations listed below are when viewed from the back of the television.

Small PCBs

Power Input PCB

Located on the left side of the TV, this has a power input socket and power filtering and regulation components.

RF Input daughterboard PCB

The RF input PCB is located on the lower-right side of the TV and is connected to the main input and processing PCB via a header connector. There are a pair of RF input ICs marked Sony D2856ER

Wifi module and antenna PCB

This small PCB located at the bottom of the TV has a WiFi and Bluetooth module which is marked as J20H088 and is made by Foxconn

Infrared Receiver PCB

This small PCB located at the bottom of the TV has infrared receiver module and also a small light sensor.

Unknown function PCB

This small PCB located at the bottom of the TV has a single 5 pin IC marked TA7 184 and two capacitors. I havent been able to find any information about this chip or its function.

Unknown function PCB

Display Driver PCB

Small PCBs

The display driver PCB is located at the bottom of the TV and has a Samsung VTU13B1C display controller IC which appears to be a commonly used 4K display driver on different brands of televisions.

LED Backlight Driver PCB

Backlight driver

The LED backlight PCB is in the centre of the TV and contains driver ICs and power regulation for the LED backlight arrays which are connected by three flat flex cables. The main driver ICs are OZS16TN which are made by O2Micro International Ltd. The manufacturer doesn’t have any datasheets available for this IC. There is also an ARM STM32F071 microcontroller which is an ARM Cortex-M0 Access line MCU with 128 Kbytes Flash, 48 MHz CPU and CEC functions.

Main Processing and Input PCB

Small PCBs

The main processing and input PCB contains the HDMI inputs and outputs and connects to the other circuit boards via ribbon cables and other higher power connectors. The main processor is a Mediatek MT5832DG1U with a second processor marked MST7411FD

Reusing the LED strips

As we now have 14 aluminium backed LED strips with 105 LEDs overall, we are planning to use some of these for lighting our CNC milling machine and lathe.

We have tested the LEDs using our current limited power supply and each LED illuminates at 12 Volts and 160mA which is approximate 2 watts for each LED.

The LEDs are connected in strips of three on the PCBs and so we can either create a current limited 36 Volt power supply or cut the PCB traces on the PCBs and solder wires to the test points each side of the LEDs to power them from a 12 Volt supply.

Small PCBs

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