Technical description and composition of the AKAI LTA-22N680HCP TV, panel type and applicable modules. The composition of the modules.AKAI
Model: LTA-22N680HCP
Chassis / Version: LS03
Panel: M220Z1-L03 REV.C1
T-CON: M22Z01-L03-X + C
Inverter (backlight): 12V 4Lamp CCFL
Power Supply (PSU): Adapter 12V // MLT-019L-C
MainBoard: JUG7.820.510-3
IC MainBoard: Cpu: MST718BE-LF, Spi Flash: W25X40AL, Eeprom: 24LC32, Audio: TDA1517P
Tuner: TAF6-F2121VH
Control: Service Mode: INPUT 3138
Technical Specifications LTA-22N680HCP
AKAI LTA-22N680HCP
General recommendations for repairing TV LCD
Possible malfunctions
- AKAI LTA-22N680HCP does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Most likely in this case, the main switching power supply (IPS) Adapter is faulty.
The owner of the TV can purchase an external power supply unit such as Adapter and repairing it is not always advisable. In any case, the simplest typical defects characteristic of most IIP schemes can be easily detected and eliminated after opening. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of converters for possible short circuit.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- 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 JUG7.820.510-3 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 board (SSB), it may be necessary to replace the chips - Cpu: MST718BE-LF, Spi Flash: W25X40AL, Eeprom: 24LC32, Audio: TDA1517P 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-F2121VH, if it is not possible to tune to television channels, make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the AKAI LTA-22N680HCP TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> AKAI 22N680HCP LS03, Main: JUG7.820.510-3, Panel: M220Z1-L03 REV.C1
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> AKAI LTA-22N680HCP Chassis LS03
LTA-15N602M, LTA-15N680HCP, LTA-15N686HCP, LTA-19N508HCP, LTA-22N680HCP, LTA-22N686HCP
The appearance of the MainBoard JUG7.820.510-3 is shown in the figure below:JUG7.820.510-3
JUG7.820.510-3 can be used on TVs:
AKAI LTA-22N680HCP (Panel M220Z1-L03 REV.C1), AKAI LTA-22N686HCP (Panel M220Z1 -L03 Rev.C1).
Key features of the AKAI LTA-22N680HCP device:
Installed matrix (LCD panel) M220Z1-L03 REV.C1.
The matrix control uses the Timing Controller (T-CON) M22Z01-L03-X + C.
A 12V inverter is used to power the backlight.
To power all the internal components of the AKAI LTA-22N680HCP TV, an external adapter type 12V // MLT-019L-C is used.
MainBoard - the main board (motherboard) is a JUG7.820.510-3 module, using Cpu chips: MST718BE-LF, Spi Flash: W25X40AL, Eeprom: 24LC32, Audio: TDA1517P and others.
The TAF6-F2121VH tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: M220Z1-L03
Type: a-Si TFT-LCD, Panel
Diagonal size: 22.0 inch
Resolution: 1680x1050, WSXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 473.76x296.1 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V