Technical description and composition of the AKAI LTA-26C904 TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-26C904 LTA-26C904M
Panel: V260B1-L02
T-CON: CM1671A-KQ
Inverter (backlight): integrated into PSU; 4 lamp
PWM Inverter: SG3525AN
Power Supply (PSU): MIP260D
PWM Power: L6562 (PFC), SG3525, F9222L
MainBoard: JUG7.820.265-2
IC MainBoard: SVP AX68 7668 24LC64 TDA7266SA 74HC4052D 74LVC14AD CAT6353CQ D1216AJTA-4B-E KMA6D5P SGM330A TDA9886TS
Tuner: AFT7 / W103
Control: Remote: GK23J6-C15
Technical Specifications LTA-26C904
AKAI LTA-26C904
General recommendations for repairing TV LCD
It is advisable to start diagnosing the malfunction of the AKAI LTA-26C904 TV, like all others, with an external examination of possible changes, both external and internal elements. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
In the absence of any signs of operability, when the AKAI LTA-26C904 does not turn on and does not signal anything with the control lights on the panel, the MIP260D power supply module is most likely faulty. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip L6562 SG3525 F9222 can also cause a breakdown of the power switch of the converter.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
In cases where the AKAI LTA-26C904 TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, images may appear and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Often attempts to repair the 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 such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Diagnosis and repair of the JUG7.820.265-2 motherboard is carried out by checking the performance of power stabilizers or updating the software (software). Board repair and chip replacement SVP AX68 7668 24LC64 TDA7266SA 74HC4052D 74LVC14AD CAT6353CQ D1216AJTA-4B-E KMA6D5P SGM330A TDA9886TS, Tuner: AFT7 / W103 are made with the necessary equipment and the corresponding element base.
Remember! Attempts to self-repair by users of the AKAI LTA-26C904 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LTA-26C904, LTA-32C904
The appearance of the MainBoard JUG7.820.265-2 is shown in the figure below:JUG7.820.265-2
JUG7.820.265-2 can be used on TVs:
AKAI LTA-26C904 (Panel V260B1-L02 ), SUPRA STV-LC2611W (Panel T260XW02), SUPRA STV-LC3204WD (Panel LTA320AP02).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the MIP260D module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the L6562 PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Key Features of the AKAI LTA-26C904:
Installed matrix (LCD panel) V260B1-L02.
The matrix control uses the Timing Controller (T-CON) CM1671A-KQ.
To power the backlight, a converter is used, combined with the power supply, controlled by the SG3525AN PWM controller.
The necessary supply voltages for all nodes of the AKAI LTA-26C904 TV are generated by the MIP260D power module or its analogs using L6562 (PFC), SG3525, F9222L microcircuits.
MainBoard - the main board (motherboard) is a JUG7.820.265-2 module using SVP AX68 7668 24LC64 TDA7266SA 74HC4052D 74LVC14AD CAT6353CQ D1216AJTA-4B-E KMA6D5P SGM330A TDA9886TS and others.
The AFT7 / W103 tuner provides TV reception and channel tuning.
Information from an alternative source:
AKAI LTA-26C904
Panel Type (Matrix): V260B1-L02,
Motherboard: JUG7.820.265-2, SVP AX68 7668, 24LC64, TDA7266SA, 74HC4052D, 74LVC14AD, CAT6353CQ, D1216AJTA-4B-E, KMA6D5P, SGM330A, TDA9886TS, SAW: D9533FT, & D393107Ner & &
T-con: CM1671A-KQ, AAT1168B
PSU: MIP260D, L6562, SG3525, F9222
Remote control: GK23J6-C15
Brand: AKAI, Model: LTA-26C904.
Short from TV: LCD, 26 ", 1366x768, 720p HD, sound: 10 watts.
The composition uses MainBoard JUG7.820.265-2 and the LCD panel (matrix) V260B1-L02.
Power Supply Unit (PSU) MIP260D Power Supply.
AKAI LTA-26C904 TV with V260B1-L02 LCD display, 26 "(66 cm) diagonal size in 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 1200: 1. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standard max 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound system 10 W (2x5 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, S-Video, component, SCART x2, RGB, VGA, HDMI. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV working in the network mode is 130 watts.
Overall dimensions: 660x470x110 mm.
The mass of the TV: 17.5 kg.
Attention! The AKAI LTA-26C904 LCD TV panel V260B1-L02 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!