Technical description and composition of the SONY KDL-46V4000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-46V4000
Chassis / Version: EG1L_L
Panel: LTY460HB08 002
Inverter (backlight): SSB460HA24 Rev0.3
PWM Inverter: 2903 PBLX
Trans Inverter: 1055R A810J
Power Supply (PSU): IP5
PWM Power: R2A20112 (PFC 16pin), CXD9841P
MainBoard: 1-877-114-12 - I1545598F - 603N4007-02R
IC MainBoard: CXB1444R, TPA310002
Technical Specifications KDL-46V4000
SONY KDL-46V4000
General recommendations for repairing TV LCD
It is reasonable to start the repair of the SONY KDL-46V4000 TV with a careful external inspection before proceeding to the diagnosis of the malfunction. It is advisable to carefully internal and external components. Often, for certain external signs, the repairman can draw some conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a hint in the assumptions about the causes and consequences of the malfunction.
In the absence of any signs of operability, when the SONY KDL-46V4000 does not turn on and does not signal anything with the control lights on the panel, the IP5 power supply module is most likely faulty. When diagnosing and repairing the power supply, first of all, it is necessary to check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes or power switch.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason, and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip R2A20112, CXD9841P from the manufacturer.
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked.
When repairing the SSB460HA24 Rev0.3 inverter, it is often necessary to disable the protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
When repairing an MB board, you must check its components CXB1444R, TPA310002. Defective items should be replaced.
Attention to users! Self-repair of a SONY KDL-46V4000 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram -------------> Sony KDL-40V4000, KDL-46V4000, KDL-52V4000 CHASSIS EG1L-L
PSU / schematic diagram -------------> Sony 1-876-467-11, 1-876-467-21 IP5 Power supply
The appearance of MainBoard 1-877-114-12 is shown in the figure below:1-877-114-12
1-877-114-12 can be used on TVs:
SONY KDL-40L4000 K (Panel LTZ400HA07 A03), SONY KDL-40V4210 (Panel LTZ400HA07), SONY KDL-46V4000 (Panel LTY460HB08 002), SONY KDL-40U4000 (Panel LTY400HA11).
PSU Advanced
The KDL-46V4000 uses an IP5 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the R2A20112 16pin PWM controller, which eliminates the charge current of the rectifier filter's electrolytic capacitor from the network directly through the open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the device SONY KDL-46V4000:
Installed matrix (LCD panel) LTY460HB08 002.
The SSB460HA24 inverter is used to power the backlight, controlled by the 2903 PBLX PWM controller. A transformer 1055R A810J is installed in the inverter converter.
The necessary supply voltages for all nodes of the SONY KDL-46V4000 TV are generated by the IP5 power supply module, or its analogs using the R2A20112 (PFC 16pin), CXD9841P microcircuits.
MainBoard - the main board (motherboard) is a module 1-877-114-12, using microcircuits CXB1444R, TPA310002 and others.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY460HB08
Type: a-Si TFT-LCD, Panel
Diagonal size: 46 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 1018.08x572.67 mm
Lamp Type: CCFL