Technical description and composition of the SONY KDL-26U4000 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-26U4000
Chassis / Version: SE2AG
Panel: LTA260AP01 // 1-802-706-11
T-CON: 260AP01CLV1.3
Inverter (backlight): INV26S10A
PWM Inverter: OZ9966ASN
MOSFET Inverter: AOD486A
Trans Inverter: LT-U2610-1
Power Supply (PSU): 1-876-635-12 GA2
PWM Power: MCZ3001DB, MIP2H2, PQ1CG203 (5)
MOSFET Power: K3568, 2SC3052EF-T
MainBoard: 1-876-638-11 BC1
IC MainBoard: CXD1978R-T6, LA5795T-TLM-E, BD9853AFV-E2, NJM3414AV
Tuner: BTF-HF412T
Control: RM-ED009
Technical Specifications KDL-26U4000
SONY KDL-26U4000
General recommendations for repairing TV LCD
SONY KDL-26U4000 TV, like any other, it is advisable to start repairing it by inspecting the internal and external visible physical visual changes. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
In the case when the KDL-26U4000 does not turn on, does not respond to the remote control and buttons on the front panel, does not blink lights and does not show any signs of operability, most likely the GA2 power supply module is faulty in this case. In this case, first of all, it is necessary to check the fuse at the mains input. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Options are K3568, 2SC3052EF-T.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PWM controller chip MCZ3001DB, MIP2H2, PQ1CG203 (5), which can only be checked by replacing with a new or obviously working one.
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
If the SONY KDL-26U4000 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU.
Often, attempts to repair the INV26S10A inverter are hampered by the fact that the fault diagnosis is complicated by the operation of its protection, which is designed to turn off the inverter in emergency conditions - when the lamps are depressurized, breaks or short circuits in high-voltage connections and other emergency situations. Lock protection to localize the defect is popular among repairmen.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Repair or diagnostics of the BC1 motherboard should be started by checking the power conditioners. If necessary, you should update the software (software). Board repair and replacement of CXD1978R-T6, LA5795T-TLM-E, BD9853AFV-E2, NJM3414AV microcircuits are carried out with the necessary equipment, and the corresponding element base.
If the TV works normally from external devices, but does not tune into television channels, the BTF-HF412T tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
Service manual / schematic diagram -------------------> Sony KDL-26U4000 OIRT, KDL-32U4000, KDL-37U4000 CHASSIS SE2AG
PSU schematic diagram -------------------> Sony 1-876-635-12 GA2 Power supply
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-26U4000:
Installed matrix (LCD panel) LTA260AP01 or 1-802-706-11.
The matrix control uses the Timing Controller (T-CON) 260AP01CLV1.3.
The INV26S10A inverter is used to power the backlight, it is controlled by the OZ9966ASN PWM controller. A transformer LT-U2610-1 is installed in the inverter converter. As power elements of the inverter, keys of the AOD486A type are used.
The necessary supply voltages for all nodes of the SONY KDL-26U4000 TV are generated by the power module 1-876-635-12, or its analogs using microchips MCZ3001DB, MIP2H2, PQ1CG203 (5) and power switches of the type K3568, 2SC3052EF-T.
MainBoard - the main board (motherboard) is a module 1-876-638-11, using microcircuits CXD1978R-T6, LA5795T-TLM-E, BD9853AFV-E2, NJM3414AV and others.
The BTF-HF412T tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA260AP01
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: APVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 14%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 2000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 5 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
