REPAIRING / SERVICING TV SONY KDL-43WF804

Technical description and composition of the TV SONY KDL-43WF804, type of panel and modules used. Module composition.
Composition
Specifications
SONY KDL-43WF804
LCD TV LED Smart KDL-43WF804 | Year of manufacture: 2018
Screen diagonal: 42.5" (108 cm)
Display format: 16:9
Resolution: 1920x1080
Refresh rate:     50Hz
LED backlight: yes, Edge LED
Smart: yes. Wi-Fi support: yes
Operating system: Android
Support HD: 1080p Full HD, HDR
Viewing Angle: 178 °
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S
Teletext: Yes
Multimedia: MP3, WMA, MPEG4, HEVC (H.265), Xvid, DivX, MKV, JPEG
Stereo sound: there is
Sound Power: 10W (2x5W)
Acoustics: two speakers
Interface: AV, HDMI x4, USB x3, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11ac, Miracast
Headphone jack: yes
TV weight: with stand: 9.9 kg
Without stand: 9.4 kg
Dimensions: with stand 970x631x268mm
without stand 970x571x57mm
AC Consumption: 85W

SONY LED
Model: KDL-43WF804

Chassis/Version: BCX

Panel: T430HVF03.2

LED backlight: 74.43T08.004-00-FC1 LB43044 V1_00_R, LB43044 V1_00_L

T-CON: T430HVN01.9 Ctrl 43T01-C0G

LED driver (backlight): 1-982-630-11 (173684611) A2201000A

PWM LED driver: BD9423EFV

MOSFET LED driver: D2910

Power Supply (PSU): Adapter 19.5V 4.36A 85W

MainBoard: 1-982-626-21 (173684221) A2199475A

IC MainBoard: CPU: MT5832 DGI J, eMMC H26M52208FRP, DRAM, AUDIO, DC/DC

Tag: CE251ZP.JPG

Control: IR: 1-982-772-11 (173690111), WiFi J20H088 1-458-998-11
General advice about LCD LED TV repair
Possible problems

- SONY KDL-43WF804 TV does not turn on, does not respond to the remote control and control panel buttons, does not shine or blink indicators.

With such manifestations, in some cases the Adapter power module is defective.
External power supply of Adapter 19.5V 4.36A 85W type the owner of the TV usually buys himself, it often happens that its repair is not expedient, but the simplest defects typical of the power supply can be seen and easily eliminated after opening it. It is necessary to measure its output voltages, and in case of their absence (complete or partial), you should check the serviceability of power converter keys and rectifier diodes for possible short circuits.
If the semiconductors in the secondary circuits breakdown, the inverter can usually fail in the short-circuit mode, and the mains fuse is often blown when there is a short circuit in the primary circuit power elements.
Breakdown of the Mos-Fet switches used in switching sources is often caused by faults in other elements, such as in the PWM controller supply circuit, in the frequency-retaining or damping circuits, and in the Negative Feedback Stabilization circuit. PWM microcircuits are usually checked by replacing them with new ones or with ones known to be in good working order.

- No picture, sound is there, remote responds. Or the image can appear for a second and then disappear at once.

In these cases the LED panel backlight failure is the most probable. Usually the cause of the trouble is the breakage of the LEDs or in the connectors of the LED strips 74.43T08.004-00-FC1 LB43044 V1_00_R, LB43044 V1_00_L, but sometimes the LEDdriver is also at fault.
It is impossible to detect a breakage in the line of LEDs without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their junctions you will need several tens of volts. Ideally a current source would be suitable for this purpose. You can open up the panel and check each LED separately. Usually, Chinese multimeters will light up one 3 volt LED slightly if you connect the probes to it in the forward direction (red probe to the anode, black probe to the cathode). For twin 6-volt LEDs, the PN junction of its faulty stabilizer can be used as an indicator of the health of the LED. If the LED is faulty, it will either be open or shorted.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.


- The TV set will not turn on, the LED will indicate standby or operation mode, or it will blink.

Repair or diagnosis of the motherboard 1-982-626-21 should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (firmware). Repair and replacement of CPU: MT5832 DGI J, eMMC H26M52208FRP, DRAM, AUDIO, DC/DC chips are made with the necessary equipment and the appropriate component base. Malfunctions associated with the use of soldering technology BGA processor can be localized by the method of heating.

If there is no TV channel reception, but the TV set is working properly from external devices, you must first check the CE251ZP.JPG tuner supply voltage and update the software. It is necessary to check the I2C communication pulses with an oscilloscope.

We would like to remind the TV users once again: Do not try to repair yourself without the appropriate knowledge, experience and necessary qualification!

More on MainBoard repair

An exterior view of the MainBoard 1-982-626-21 is shown in the illustration below:

1-982-626-21

The main features of the SONY KDL-43WF804:

A matrix (LED panel) T430HVF03.2 is installed.
Timing Controller (T-CON) T430HVN01.9 is used to control the matrix.
LED Driver 1-982-630-11, controlled by BD9423EFV PWM controller, is used to power the backlight LEDs. D2910 type switches are used as power elements of the LED driver.
To power all the internal components of the TV SONY KDL-43WF804 uses an external power supply of Adapter 19.5V 4.36A 85W.
MainBoard - the main board (motherboard) is a module 1-982-626-21, with the application of CPU chips: MT5832 DGI J, eMMC H26M52208FRP, DRAM, AUDIO, DC/DC and others.
The CE251ZP.JPG tuner allows you to receive TV programs and tune to channels.

Instructions and updates

Upgrade firmware to v6.6555:

File sony_dtvota_2016_1606555100_eua_auth.zip, version 6.6555 of April 22, 2020 (1,886,350,011 bytes).

For models: KD43XG8305, KD49XG8305, KD49XG8377, KD43XG8388, KD49XG8388, KD43XG8396, KD49XG8396, KD43XG8399, KD49XG8399, KD49XG9005, KD55AG8, KD65AG8, KD43XG8096, KD49XG8096, KD55XG8096, KD65XG8096, KD75XG8096, KD43XG8196, KD49XG8196, KD55XG8196, KD65XG8196, KD65AF8, KD55AF8, KD75XF9005, KD65XF9005, KD55XF9005, KD49XF9005, KD65XF8796, KD55XF8796, KD49XF8796, KD43XF8796, KD65XF8599, KD55XF8599, KD49XF8599, KD43XF8599, KD85XF8596, KD75XF8596, KD65XF8596, KD55XF8596, KD49XF8596, KD43XF8596, KD65XF8588, KD55XF8588, KD49XF8588, KD43XF8588, KD65XF8577, KD55XF8577, KD49XF8577, KD43XF8577, KD65XF8505, KD55XF8505, KD49XF8505, KD43XF8505, KD70XF8305, KD60XF8305, KD55XF8096, KD49XF8096, KD43XF8096, KD65XF7596, KD55XF7596, KD49XF7596, KD43XF7596, KDL49WF805, KDL43WF805, KDL49WF804, KDL43WF804, KD77A1, KD65A1, KD55A1, KD75XE9405, KD65XE9305, KD55XE9305, KD75XE9005, KD65XE9005, KD55XE9005, KD49XE9005, KD75XE8596, KD65XE8599, KD65XE8596, KD65XE8588, KD65XE8577, KD65XE8505, KD55XE8599, KD55XE8596, KD55XE8588, KD55XE8577, KD55XE8505, KD55XE8396, KD55XE8096, KD49XE8396, KD49XE8099, KD49XE8096, KD49XE8088, KD49XE8077, KD49XE8005, KD49XE8004, KD43XE8396, KD43XE8099, KD43XE8096, KD43XE8077, KD43XE8005, KD43XE8004, KD100ZD9, KD75ZD9, KD65ZD9, KD49XD8305, KD43XD8305, KD55XD8005, KD49XD8005, KD43XD8005, KD49XD8077, KD43XD8077, KD49XD8088, KD43XD8088, KD49XD8099, KD43XD8099, KD65XD7504, KD65XD7505, KD55XD7004, KD49XD7004, KD55XD7005, KD49XD7005, KD50SD8005.

The update file and instructions can be downloaded from the manufacturer's website for the KDL-43WF804 model.

Benefits and improvements of the latest update:

Improved power-on time of the TV when it comes out of standby mode.

Manuals and instructions are also available for this model:

Reference Manual (Web Manual). Published Feb 13, 2019.
Reference Manual. Published 28 Nov 2019, size 942 KB.
Other. Published May 09, 2018, size 13.76 MB.
Quick start guide and quick start guide. Published 07 May 2018, size 337 KB.

SONY KDL-43WF804 LCD TV with a 42.5" (108 cm) diagonal 16:9 aspect ratio. This model uses Edge LED side illumination.
The design and technical capabilities of the TV provide for viewing shows and movies in HD quality at a resolution of 1920x1080 pixels in 1080p (Full HD). Image processing is made by modern technology High Dynamic Range (HDR) with an extended range of brightness gradation.
The KDL-43WF804 has built-in SMART Software and pre-installed Android OS. Internet connection can be made via Wi-Fi wireless connection. Video processor supported multimedia file formats: MP3, WMA, MPEG4, HEVC (H.265), Xvid, DivX, MKV, JPEG.
The sound system has a capacity of 10 W (2x5 W) and is equipped with two loudspeakers. NICAM stereo signal processing system and Sound Surround surround sound function are used.
External interface (connection to other devices) is supported by standard input and output connectors: antenna input (RF), AV, HDMI x4, USB x3, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11ac, Miracast. There is a headphone output. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 TV channels.

Power consumption in mains mode is 85 W.

Dimensions: with stand 970x631x268 mm, without stand 970x571x57 mm.

TV weight: with stand 9.9 kg, without stand 9.4 kg.

Warning. The SONY KDL-43WF804 LED TV panel is the most expensive part of the TV.
Avoid hitting the glass and excessive pressure on the screen surface to prevent damage to the LED panel!
It is not safe to get any liquid on the screen. Sometimes a single drop of water is enough, if it drips down the glass onto the stubs, the TV may become unrepairable.