Technical description and composition of the HAIER LT32A1 TV, type of panel and applicable modules. The composition of the modules.HAIER
Model: LT32A1
Chassis / Version: 715G3693
Panel: LC320WXN (CB) (A1) // LC320WXE
T-CON: 6870C-0238B (LC320WXN-SBA)
Inverter (backlight): integrated into PSU
Power Supply (PSU): 715G3234-P01-H30-003M
PWM Power: A6960H, FAN7602, FAN7529
MOSFET Power: P10NK70ZPF
MainBoard: 715G3693-M01-001-004K
IC MainBoard: SPI FLASH: 25L4005A
Tuner: FQD1116ME / BH-TPV
Technical Specifications LT32A1
HAIER LT32A1
General recommendations for repairing TV LCD
Possible malfunctions
- The HAIER LT32A1 TV does not turn on at all. There is no reaction to the remote control and front-panel control buttons. Indicator lights do not light or flash.
In some of these cases, the main switching power supply - module 715G3234-P01-H30-003M is found to be faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of the power switches (P10NK70ZPF) and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key 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 an excess of the maximum current or voltage. 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) A6960H, FAN7602, FAN7529, 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 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. 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.
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 they are finished, 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the motherboard 715G3693-M01-001-004K should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Board repair and replacement of chips SPI FLASH: 25L4005A are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If there is no reception of television channels, but the TV works properly from external devices, first of all you need to check the voltage of the tuner FQD1116ME / BH-TPV and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
FIRMWARE FOR SPI FLASH --------------> HAIER LT32A1, Main: 715G3693-M01-001-004K, Panel: LC320WXN (CB)(A1)
Service Manuals with Schematic Diagrams 144 pages 2010 on model LT26A1, LT32A1.
The appearance of MainBoard 715G3693-M01-001-004K is shown in the figure below:715G3693-M01-001-004K
The appearance of the power supply
Key Features of HAIER LT32A1:
Installed matrix (LCD panel) LC320WXN (CB) (A1) or LC320WXE.
The matrix control uses the Timing Controller (T-CON) 6870C-0238B.
To power the backlight, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the TV HAIER LT32A1 are formed by the power module 715G3234-P01-H30-003M, or its analogs using microchips A6960H, FAN7602, FAN7529 and power switches of the type P10NK70ZPF.
MainBoard - the main board (motherboard) is a module 715G3693-M01-001-004K, using microchips SPI FLASH: 25L4005A and others.
The FQD1116ME / BH-TPV tuner provides TV reception and channel tuning.
HAIER LT32A1 LCD TV with LC320WXN LCD, 32 "(81 cm) diagonal in 16: 9 format. Screen brightness of 500 cd / m² is ensured by backlighting with CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 1200 : 1. It is possible to view images in high quality HD at a resolution of 1366x768 pixels in the standard of 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 takes place in standard Ports 480i, 480p, 576i, 576p, 720p, 1080i Supported media file formats: MP3, JPEG.
The power of the sound system 10 W (2x5 W) provides two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, component, SCART x2, RGB, VGA, HDMI x2, USB. An output for connecting headphones is provided. 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.
A digital tuner is capable of receiving television channels in DVB-T standards.
The power consumed by the TV working in the network mode is 130 watts.
Overall dimensions: With stand 790x570x240 mm, Without stand 790x530x91 mm.
The mass of the TV: 9.23 kg.
Attention! The LC320WXN (CB) (A1) panel of the HAIER LT32A1 LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!