Technical description and composition of the SITRONICS LCD-2033 TV, type of panel and applicable modules. The composition of the modules.Sitronics
Model: LCD-2033
Chassis / Version: UN.TD6D-1
Panel: V201V1-T03 Rev C2
Lamp backlight: 6 Lamp CCFL
Inverter (backlight): E3701-004005-2 0609
Power Supply (PSU): Adapter 12V
PWM Power: UC3842AN
MOSFET Power: 07N60
MainBoard: CX-NPTD15-01B B.UN.TD6D-1
IC MainBoard: SM5964
Tuner: TDQ3B8T / W126CWA
Appearance
SITRONICS LCD-2033
General repair guidelines for TV LCD
Possible malfunctions
- Sitronics LCD-2033 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light or blink indicators.
Typically, with such manifestations, the defect is caused by faulty elements in the main adapter power module.
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 measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power switches (07N60) of converters and rectifier diodes for the presence of a possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers UC3842AN, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, there is a reaction 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, 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 circuit should be restored immediately after the repair is completed.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the CX-NPTD15-01B 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SM5964 and replace failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the TDQ3B8T / W126CWA tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, we remind users of TV: 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.
Screen size 20-inch (50.8 cm), 4: 3 aspect ratio, 640x480 resolution, NICAM stereo sound - 2 x 5 WRepair MainBoard
The appearance of the MainBoard CX-NPTD15-01B is shown in the figure below:
CX-NPTD15-01B
Main features of the SITRONICS LCD-2033 device:
Installed matrix (LCD panel) V201V1-T03 Rev C2.
The inverter E3701-004005-2 is used to power the backlight.
To power all internal components of the SITRONICS LCD-2033 TV, an external adapter 12V type is used with UC3842AN microchips and 07N60 type power switches.
MainBoard - the main board (motherboard) is a CX-NPTD15-01B module, using SM5964 chips and others.
The TDQ3B8T / W126CWA tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V201V1-T03
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
Brightness: 500 cd / m²
Contrast Ratio: 600: 1
Display Colors: 262K (6-bit), CIE1931 75%
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 6-bit), 50 pins
Voltage: 5.0V (VCC)