Technical description and composition of the SONY KDL-55W955B TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-55W955B
Panel: LC550EUF (FG) (F1)
LED driver (backlight): 14ST016S-A01 rev: 1.0
PWM LED driver: MSL2166, 32P051C8
MOSFET LED driver: STU04N20
Power Supply (PSU): APS-362 1-893-621-11
MainBoard: 1-889-347-22 - 173462322 - A1992575B
IC MainBoard: CXD4743GB, CXD4739GB, H5TQ4G63AFR, TAS5731
Tuner: 1-889-203-22 - 173457522
Control: Wifi: J20H076 - MCLJ20H076 - 2878D-J20H076
Technical Specifications KDL-55W955B
SONY KDL-55W955B
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-55W955B TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Failure in such cases should begin to be sought in the APS-362 power supply circuits. It is necessary to measure its output supply voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, sometimes you can detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 1-889-347-22 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips CXD4743GB, CXD4739GB, H5TQ4G63AFR, TAS5731 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
We recommend the owners of the KDL-55W955B TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service Manual 30 pages of 2014 for the models ---------------------> KDL-32W700B, KDL-40W607B, KDL-40W580B, KDL-40W609B, KDL-40W700C, KDL-48W730C, KDL-40W590B, KDL-42W700B, KDL-42W800B, KDL-48W580B, KDL-40W600B, KDL-48W590B, KDL-40W600B, KDL-48W600B, KDL-40W605B, KDL-48W605B, KDL-48W607B, KDL-48W609B, KDL-48W700C, KDL-50W700B, KDL-50W790B, KDL-50W800B, KDL-50W805B, KDL-32W700C, KDL-55W700B, KDL-55W790B, KDL-55W800B, KDL-55W807B, KDL-55W950B, KDL-55W955B, KDL-55W957B, KDL-60W605B, KDL-60W607B, KDL-60W610B, KDL-60W630B, KDL-60W840B, KDL-60W850B, KDL-60W855B, KDL-60W857B, KDL-65W950B, KDL-65W955B, KDL-70W830B, KDL-70W840B, KDL-70W850B, KDL-70W855B, KDL-70W856B, KDL-70W857B, KDL-43W780C, KDL-42W815B, KDL-42W817B, KDL-42W828B, KDL-48WM15B, KDL-60WM15B, KDL-55X830B, XBR-85X955B, KDL-65X830B, XBR-85X957B, KDL-70X830B, XBR-49X850B, XBR-49X855B, XBR-55X800B, XBR-55X850B, XBR-55X855B, XBR-55X900B, XBR-55X905B, XBR-65X800B, XBR-65X850B, XBR-65X855B, XBR-65X857B, XBR-65X900B, XBR-65X905B, XBR-65X907B, XBR-65X950B, XBR-65X955B, XBR-70X850B, XBR-70X855B, XBR-79X900B, XBR-79X905B, XBR-79X907B, XBR-85X950B, XBR-85X955B, KD-49X8500B, KD-65X9500B, KD-70X8500B, KD-55X8500B, KD-75S9000B, KD-79X9000B, KD-85X9500B, KD-65S9000B, KD-65X8500B, KD-49X8500B, KD-55X8000B, KD-55X8500B, KD-55X9200B, KD-65X8500B, KD-55X9000B, KD-65X9200B, KD-65S9000B, KD-65X9500B, KD-65S9000B, KD-65X9500B, KD-65X8000B, KD-70X8500B, KD-70X8500B, KD-75S9000B, KD-79X9000B, KD-85X9500B, KD-49X8505B, KD-55X8505B, KD-55X9005B, KD-65S9005B, KD-65X8505B, KD-65X9005B, KD-65X9505B, KD-70X8505B, KD-75S9005B, KD-79X9005B, KD-85X9505B
The appearance of MainBoard 1-889-347-22 is shown in the figure below:1-889-347-22
The appearance of the power supply
Main features of the device SONY KDL-55W955B:
Installed matrix (LED-panel) LC550EUF (FG) (F1).
The LED driver 14ST016S-A01 is used to power the backlight LEDs, it is controlled by the PWM controller MSL2166, 32P051C8. As power elements of the LED driver, keys of the STU04N20 type are used.
The formation of the necessary supply voltages for all nodes of the SONY KDL-55W955B TV is carried out by the APS-362 power module, or its analogs.
MainBoard - the main board (motherboard) is a module 1-889-347-22, using microcircuits CXD4743GB, CXD4739GB, H5TQ4G63AFR, TAS5731 and others.
The tuner 1-889-203-22 - 173457522 provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC550EUF-FGF1
Type: a-Si TFT-LCD, Panel
Diagonal size: 55 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 1209.6x680.4 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 400 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: V-by-One 4 lane, 51 pins
Voltage: 12.0V