Technical description and composition of the ERISSON 32LET20 TV, panel type and applicable modules. The composition of the modules.ERISSON LED
Model: 32LET20
Chassis / Version: PA20155-2-3TG
Panel: LC201V02
LED backlight: 6 Lamp CCFL
PWM LED driver: FAN7311, AO4606
Power Supply (PSU): Adapter 12V
MainBoard: PA20155-2 - 3TG
IC MainBoard: TDA15063H, 24C16, MST9010SA-LF, AN17825A
Tuner: TDQ-6F6 / W126D
Specifications 32LET20
ERISSON 32LET20
General repair guidelines for TV LCD LED
Possible manifestations of defects
- ERISSON 32LET20 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.
Most likely in this case, the main switching power supply (IPS) Adapter is faulty.
The external adapter 12V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to verify the presence of secondary voltages and, if they are absent, check the power switches and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter can emergencyly operate in the short circuit mode, and during short circuit in the power 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 is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In such cases, the most likely malfunction of the LED backlight elements. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the PA20155-2 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 cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips TDA15063H, 24C16, MST9010SA-LF, AN17825A and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
The malfunction of the TDQ-6F6 / W126D tuner is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
TV users and owners need to remember that attempts to independently repair an ERISSON 32LET20 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> ERISSON 32LET20 , Main: 40-MT2700-MAB2LG, Panel: 1080p Full HD, 1920x1080
The appearance of MainBoard PA20155-2 is shown in the figure below:PA20155-2
PA20155-2 can be used in TVs:
ERISSON 20LM01 (Panel LC201V02), ERISSON 32LET20 (Panel LC201V02).
Main features of the ERISSON 32LET20 device:
Installed matrix (LED-panel) LC201V02.
A converter controlled by the FAN7311 PWM controller, AO4606 is used to power the backlight LEDs.
To power all internal nodes of the ERISSON 32LET20 TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a PA20155-2 module, using TDA15063H, 24C16, MST9010SA-LF, AN17825A and others.
The TDQ-6F6 / W126D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-SDA3
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 12/13 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 12.0V
Trademark: ERISSON, Model: 32LET20.
Short from TV: LCD, 1080p Full HD, 32 ”(81 cm) diagonal, HDMI: 2, USB: 2, backlight type: Edge LED.
The composition uses MainBoard PA20155-2 - 3TG and LCD panel (matrix) LC201V02.
Power supply unit external Adapter 12V.
TV ERISSON 32LET20 with LCD display LC201V02, diagonal size 32 "(81 cm) 16: 9 format. The required brightness of the screen 350 cd / m² is provided by LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 1000: 1. The LED panel of this TV uses end LED backlighting - Edge LED.The TV’s design and technical features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution of 1080p (Full HD) standard. the signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, DivX, JPEG. Stereo audio implemented by two built-in speakers, NICAM STEREO audio processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, SCART, RGB, VGA, HDMI x2, USB x2. 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, 1280x1024, 1360x768.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
Overall dimensions: With stand 373x270x120 mm, Without stand 524x340x44 mm.
Attention! The panel of the LC201V02 LED-TV ERISSON 32LET20 is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.