Technical description and composition of the AKAI LT-20Q6LV TV, type of panel and applicable modules. The composition of the modules.AKAI
Model: LT-20Q6LV
Chassis / Version: VCT 111-A114B
Panel: HT201V01-101 // LC20ET1
Inverter (backlight): P2066E35 ver 1.0
PWM Inverter: OZ960S
Power Supply (PSU): Adapter 12V
MainBoard: VCT111-A114B
IC MainBoard: VCT6973G.B2.000, TDA2822, LA4282, TCMW3001PD29A (H
Tuner: TCMW3001PD29A
Control: RC6-8 / W SR
Appearance
AKAI LT-20Q6LV
General recommendations for repairing TV LCD
Possible manifestations of defects
- The AKAI LT-20Q6LV TV does not turn on at all. There is no reaction to the remote control or to the control buttons from the front panel. Indicator lights do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the main power supply adapter.
This TV model is equipped with an external power adapter adapter type 12V, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes there is a certain sense to open it and eliminate simple typical defects typical of IPS. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary first of all to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn 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. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
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 circuit 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 VCT111-A114B 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements VCT6973G.B2.000, TDA2822, LA4282, TCMW3001PD29A (H. Malfunctions of BGA chips are usually easy to detect by heating.
Before changing the tuner TCMW3001PD29A, 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
Owners and users of the AKAI LT-20Q6LV TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Key Features of the AKAI LT-20Q6LV:Installed matrix (LCD panel) HT201V01-101 or LC20ET1.
To power the backlight, an inverter P2066E35 is used, it is controlled by the OZ960S PWM controller.
To power all internal nodes of the AKAI LT-20Q6LV TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a VCT111-A114B module, using VCT6973G.B2.000, TDA2822, LA4282, TCMW3001PD29A (H and others) microcircuits.
The TCMW3001PD29A tuner provides TV reception and channel tuning.
Information from an alternative source:
AKAI LT-20Q6LV
Panel Type (Matrix): LC20ET1
Motherboard: P / N: 104952 (111-A114B) B / D, VCT6973G B2 000, 24C64, DTC34LF86L, LA4282, Tuner: TCMW3001PD29A (H)
Invertor: P2066E35 ver 1.0, OZ960S
Remote control: RC6-8 / W SR
Additional technical information about the panel:
Brand: BOE
Model: HT201V01-101
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 700: 1
Display Colors: 16.7M (8-bit)
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V