Technical description and composition of the DAEWOO DLP-20D3N TV, type of panel and applicable modules. The composition of the modules.DAEWOO
Model: DLP-20D3N
Chassis / Version: SL-120P
Panel: LTA200V1-L01
Inverter (backlight): DS-1020WDL
PWM Inverter: BIT3105
MOSFET Inverter: APM4542
Power Supply (PSU): Adapter 12V AP06312-UV
MainBoard: SL-120P MAIN
IC MainBoard: CPU: TDA15521E / N1F81, TDA9178T; EEPROM: 24C32L; Sound LA42072;
Tuner: UV1316 / A
Specifications
DAEWOO DLP-20D3N
General recommendations for repairing TV LCD
Possible manifestations of defects
- The DAEWOO DLP-20D3N TV does not turn on and does not show any signs of turning on at all. There are no reactions to the control buttons or the remote control.
Most likely in this case, the main switching power supply (IPS) Adapter is faulty.
This TV model is equipped with an external power adapter type Adapter 12V AP06312-UV, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes it makes some sense to open it and eliminate simple typical defects typical of IPS. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the power elements of the primary circuit, the mains fuse 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
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.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the SL-120P motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits 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 CPU elements: TDA15521E / N1F81, TDA9178T; EEPROM: 24C32L; Sound LA42072 ;. BGA chip malfunctions are usually easy to detect by warming up.
Before replacing the UV1316 / A tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via I2C
TV users and owners need to remember that attempts to self-repair a DAEWOO DLP-20D3N TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> DAEWOO DLP-17D3N, DLP-20D3, DLP-20D3N
Main features of the DAEWOO DLP-20D3N device:Installed matrix (LCD panel) LTA200V1-L01.
The DS-1020WDL inverter is used to power the backlight, controlled by the BIT3105 PWM controller. As power elements of the inverter, keys of the APM4542 type are used.
To power all the internal components of the DAEWOO DLP-20D3N TV, an external adapter 12V type AP06312-UV is used.
MainBoard - the main board (motherboard) is a SL-120P module using CPU chips: TDA15521E / N1F81, TDA9178T; EEPROM: 24C32L; Sound LA42072; and others.
The UV1316 / A tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA200V1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.0 inch
Resolution: 640x480, VGA
Display Mode: PVA, Normally Black, Transmissive
Active Area: 406.08x304.56 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 600: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 72%
Response Time: 15/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 5.0V