Technical description and composition of the SONY KDL-46NX700 TV, panel type and modules used. The composition of the modules.SONY LED
Model: KDL-46NX700
Chassis / Version: BEHS
Panel: LK460D3LA8T
LED backlight: RUNTK4337TP
LED driver (backlight): integrated into PSU
Power Supply (PSU): APS-263 1-881-773-12 1-474-212-11
PWM Power: PFC, PWM, LED-DRIVER
MainBoard: 1-881-779-11
IC MainBoard: MB91F313A, K9F1208U0C, CXA3803R, TAS5707, CXD2817R
Tuner: SUT-HE111Z
KDL-46NX700 Specifications
SONY KDL-46NX700
General recommendations for TV LCD LED repair
Possible malfunctions
- SONY KDL-46NX700 TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
Usually with similar manifestations, the defect is caused by faulty elements in the main power supply module APS-263. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) PFC, PWM, LED-DRIVER, in the absence of external damage and short circuit between the terminals, are checked by replacing them with a known good one.
- There is no image, the screen is black, there is sound, sometimes you can see barely noticeable outlines of the image in the ambient light of the screen.
Usually, in such cases, there is no backlighting of the LED panel (matrix). The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or breakage), sometimes in the violation of the contact connections of the LED strips.
When diagnosing, it must be borne in mind that it is impossible to check for an open in the circuit of the LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally a current source. Opening the panel, you can check each LED separately. Typically, Chinese multimeters will lightly light one 3-volt LED if you connect the probes to it in the forward direction. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the 1-881-779-11 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Often the MB (SSB) board must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - MB91F313A, K9F1208U0C, CXA3803R, TAS5707 and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
In cases where the SONY KDL-46NX700 does not have a picture, but there is sound, the display backlight often does not work.
In LED TVs, the LEDs inside the LK460D3LA8T panel are usually faulty, and less often the LED driver.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Replacing the LEDs requires disassembling the LK460D3LA8T panel. We do not recommend such works on their own to TV owners and craftsmen who have no experience in repairing LCD panels, especially at home.
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and on an open TV, the light is visible through the holes in the panel case.
In this case, the T-CON (Timing Controller) board may be faulty, but often the MainBoard 1-881-779-11 is also faulty. A software failure is also possible. The panel may also be faulty - damage to strips, loops, for example, after moisture ingress. In such cases, first of all, it is necessary to check the panel supply voltage at the LVDS connector, the fuses on the T-CON board or panel brackets, as well as the supply and reference voltages for column and line drivers - VGH, VGL, Vcom.
If they are within the normal range, then the oscilloscope must track the passage of LVDS signals from MainBoard 1-881-779-11, as well as synchronizing signals to loops with drivers.
Flooded LED TV screens can sometimes be restored if no significant damage has formed in the loops and on the panel trims.
Before replacing the CXD2817R tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. You also need to make sure that the tuner and processor can exchange data via the I2C bus
Attention to TV owners! Attempts to repair SONY KDL-46NX700 yourself are not recommended by the manufacturer and can lead to serious negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> AZ1-H CHASSIS FOR MODELS KDL-40NX700, KDL-46NX700
Additional MainBoard RepairThe appearance of MainBoard 1-881-779-11 is shown in the figure below:
1-881-779-11
External view of the power supply
Main features of SONY KDL-46NX700 device:
Installed matrix (LED panel) LK460D3LA8T.
A converter combined with a power supply is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the SONY KDL-46NX700 TV is carried out by the APS-263 power module, or its analogs using PFC, PWM, LED-DRIVER microcircuits.
MainBoard - the main board (motherboard) is a 1-881-779-11 module, using microcircuits MB91F313A, K9F1208U0C, CXA3803R, TAS5707, CXD2817R and others.
The SUT-HE111Z tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SHARP
Model: LK460D3LA8T
Type: a-Si TFT-LCD, Panel
Diagonal size: 46 inch
Resolution: 1920x1080, FHD
Display Mode: ASV, Normally Black, Transmissive
Active Area: 1018.08x572.67 mm
Surface: Clear, Hard coating (2H), Antireflection
Brightness: 640 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 1.06B (8-bit + FRC)
Response Time: 4 (G to G)
Frequency: 240Hz (60Hz Input)
Lamp Type: 2 strings WLED Without Driver
Signal Interface: LVDS (2 ch, 10-bit), 55 pins
Voltage: 12.0V
Instructions and updates:
Improving Internet Security When Using Online Services:PKG4.131EUH-0108 file, version 4.131 dated 01/12/2015 (45,489,836 bytes).
For models: KDL-40NX700, KDL-40NX703, KDL-40NX705, KDL-40NX800, KDL-40NX803, KDL-40NX805, KDL-46NX700, KDL-46NX703, KDL-46NX705, KDL-52NX805, KDL-52NX .........
The update file and instructions can be downloaded from the manufacturer's website for the KDL-46NX700 model.Guides and instructions are also offered for this model:i-Manual. Published on 13 Apr 2014.User's manual. Published on 14 Feb 2011, size 6.58 MB.
The LK460D3LA8T sensor and MainBoard 1-881-779-11 software provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics decomposition at 1080p (Full HD). The input analog video signal can be processed in PAL, SECAM, NTSC systems. Graphic processing and formation of a digital signal picture occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Video processor supported media file formats: MP3, MPEG4, JPEG.
The power of the sound speaker system is 20 W (2x10 W), provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, component, SCART, RGB, VGA, HDMI x4, USB, Wi-Fi. A headphone output is provided. To connect an analog computer or laptop to this TV model, a VGA (D-Sub 15) connector is used, which supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C standards.
The power consumed when operating from the mains is 129 W. APS-263 power supply.
Dimensions: with stand 1127x748x320 mm, without stand 1127x716x64 mm.
TV weight: with stand: 27.8 kg, without stand: 24 kg.
Attention! The panel LK460D3LA8T of the SONY KDL-46NX700 LED TV is the most expensive element.
Avoid impacts on the glass and excessive pressure on the screen surface to avoid damage to the LED panel!
It is unsafe for any liquid to spill on the screen. Sometimes one drop of water is enough, if it flows down the glass onto the plumes, the TV may become unrepairable.