Technical description and composition of the AKAI LTA-26N686HCP TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-26N686HCP
Panel: T260XW02 V.R
T-CON: T260XW02 VQ
MainBoard: JUG7.820.629
IC MainBoard: MST719DU-LF CSC2314F TDA9885TS PS331 MP2309DS TDA78266SA
Tuner: TAF6-C2i21VH
Technical Specifications LTA-26N686HCP
AKAI LTA-26N686HCP
General recommendations for repairing TV LCD
Possible manifestations of defects
- The AKAI LTA-26N686HCP TV does not turn on. There are no signs of operability. The indicators on the front panel do not shine and do not blink, and the remote control and control buttons do not respond.
With such manifestations, a malfunction is most likely to be detected in the power module. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the JUG7.820.629 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MST719DU-LF CSC2314F TDA9885TS PS331 MP2309DS TDA78266SA with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before changing the tuner TAF6-C2i21VH, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, remind users! Attempts to self-repair a TV AKAI LTA-26N686HCP without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> AKAI LTA-32N658HCP, LTA-32N680HCP, LTC-26N680HCP, LTC-32N680HCP
Key features of the AKAI LTA-26N686HCP device:Installed matrix (LCD panel) T260XW02 V.R.
The matrix control uses the Timing Controller (T-CON) T260XW02.
The required supply voltage for all nodes of the TV AKAI LTA-26N686HCP provides a switching power supply.
MainBoard - the main board (motherboard) is a JUG7.820.629 module, using microchips MST719DU-LF CSC2314F TDA9885TS PS331 MP2309DS TDA78266SA and others.
The TAF6-C2i21VH tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 VR
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: VA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V