Technical description and composition of the SONY KDL-32V4000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-32V4000
Chassis / Version: SE2AG
Panel: LTZ320AA01
T-CON: 320WTC2LV8.4
Inverter (backlight): SSI320-12co1 rev04
PWM Inverter: OZ9966
Trans Inverter: U320SS
Power Supply (PSU): 1-876-635-12 GA-2
PWM Power: MCZ3001, MIP2H2
MainBoard: 1-876-638-11 - Y2008430B BC1
IC MainBoard: CXD1978R-T6, LA5795T-TLM-E, BD9853AFV-E2, NJM3414AV
Tuner: BTF-HF412T
Technical Specifications KDL-32V4000
SONY KDL-32V4000
General recommendations for repairing TV LCD
It is reasonable to start the repair of the SONY KDL-32V4000 TV with a careful external examination before proceeding to the diagnosis of the malfunction. It is advisable to carefully internal and external components. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the GA-2 1-876-635-12 power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
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 MCZ3001 MIP2H2 from the manufacturer.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of the device for their operation.
If the SONY KDL-32V4000 TV does not have an image, but there is sound, the malfunction should be sought in the power converter of the backlight (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
When diagnosing with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
On the BC1 motherboard, in the event of a malfunction, you should first check the performance of all the power stabilizers of the microcircuits and, if necessary, update the software (software).
Before replacing the BTF-HF412T tuner, if there is no tuning for the channels, you must first check the supply voltage at its terminals, including the varicap supply (30-33V).
Remember! Attempts to self-repair by users of the SONY KDL-32V4000 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual / schematic diagram -------------------> Sony KDL-26V4000, KDL-32V4000, KDL-37V4000 CHASSIS SE2AG
The appearance of MainBoard 1-876-638-11 is shown in the figure below:1-876-638-11
1-876-638-11 can be used in televisions:
SONY KDL-26U4000 (Panel LTA260AP01), SONY KDL-32V4000 (Panel LTZ320AA01), SONY KDL-37S4000 (Panel T370XW02 V.C), SONY KDL-37U4000 (Panel T370XW02 VC), SONY KDL-37V4000 (Panel T370XW02 V.C).
The appearance of the power supply
Main features of the device SONY KDL-32V4000:
Installed matrix (LCD panel) LTZ320AA01.
The matrix control uses the Timing Controller (T-CON) 320WTC2LV8.4.
The SSI320-12co1 inverter is used to power the backlight, controlled by the OZ9966 PWM controller. The transformer U320SS is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the SONY KDL-32V4000 TV is carried out by the power module 1-876-635-12, or its analogs using microchips MCZ3001, MIP2H2.
MainBoard - the main board (motherboard) is a module 1-876-638-11, using CXD1978R-T6, LA5795T-TLM-E, BD9853AFV-E2, NJM3414AV and other chips.
The BTF-HF412T tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: S-LCD
Model: LTZ320AA01
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA