Technical description and composition of the DAEWOO DLP-20J7 TV, type of panel and applicable modules. The composition of the modules.DAEWOO
Model: DLP-20J7
Panel: 640x480
MainBoard: KLC-1521QS
IC MainBoard: TDA15021H1 / N1C80, MST518-LF, TDA1517
Tuner: AFT1 / 3100G
Technical Specifications DLP-20J7
DAEWOO DLP-20J7
General recommendations for repairing TV LCD
Possible manifestations of defects
- DAEWOO DLP-20J7 TV does not turn on and does not show any signs of operability at all. There is no reaction to either the remote control or the front panel control buttons.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module. 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 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 responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the power supply of the inverter are serviceable, you should make sure that the lamps are in good working condition, 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 circuits 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 KLC-1521QS 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). When repairing an MB board, you must check its components TDA15021H1 / N1C80 MST518-LF TDA1517. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Attention to users! Self-repair of a DAEWOO DLP-20J7 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Repair MainBoard
The appearance of the MainBoard SL-130P is shown in the figure below:
SL-130P
SL-130P can be used in TVs:
DAEWOO DLP-20D7 (Panel LC201V02), DAEWOO DLP-20J3 (Panel LC201V02 (SD) (A3)), DAEWOO DLP-20J1 (Panel LC201V02-SDA3).
Main features of the DAEWOO DLP-20J7 device:
Installed matrix (LCD panel) 640x480.
The necessary supply voltage for all nodes of the DAEWOO DLP-20J7 TV provides a switching power supply.
MainBoard - the main board (motherboard) is a KLC-1521QS module, using TDA15021H1 / N1C80, MST518-LF, TDA1517 and others.
The AFT1 / 3100G tuner provides television reception and channel tuning.
Brand: DAEWOO, Model: DLP-20J7.
Briefly from the TV: LCD, 20 ", 640x480, sound: 2 watts.
The composition uses MainBoard KLC-1521QS and an LCD panel (matrix) 640x480.
DAEWOO DLP-20J7 LCD TV with a 640x480 LCD, 20 "diagonal size, 4: 3 format. The input high-frequency or video signal can be processed in PAL, SECAM, NTSC analog systems. Graphic processing and digital signal generation takes place in 480i standards, 480p, 576i.
The power of the sound system 2 W (2x1 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, S-Video, SCART, RGB.
Overall dimensions: With stand 601x454x208 mm, Without stand 1033x650x120 mm.
The mass of the TV: 9 kg.
Attention! The DAEWOO DLP-20J7 LCD TV panel 640x480 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!