Technical description and composition of the DAEWOO DSL-24L31E TV, panel type and applicable modules. The composition of the modules.DAEWOO LED
Model: DSL-24L31E
Chassis / Version: 4703-M182T7-A3235K01
Panel: K236WL
T-CON: M236HGE-P02
LED driver (backlight): 4710-B33620-A3225K41
PWM LED driver: MP3389EF
MOSFET LED driver: ME15N10-G
Power Supply (PSU): K40L1 4701-2K40L1-A3135D01
PWM Power: OB5269CP
MOSFET Power: N-FET TO-220
MainBoard: MST6M182VG-T7S 4703-M182T7-A3235K01
IC MainBoard: IT6633E-P, LM1117 (3.3), YD1517P, 25Q32
Tuner: NONAME
Control: Service Mode: MENU-8-2-0-2
Appearance
DAEWOO DSL-24L31E
General repair guidelines for TV LCD LED
Possible manifestations of defects
- DAEWOO DSL-24L31E TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
Often in such cases, the K40L1 power module is faulty. It is necessary to measure its output supply voltages, and in case of their absence, check the operability of power switches (N-FET TO-220) of converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM circuits OB5269CP are usually checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
As a rule, in such cases there is no display backlight. 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 health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- 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 MST6M182VG-T7S 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements IT6633E-P, LM1117 (3.3), YD1517P, 25Q32 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If there is no reception of television channels, but the TV works properly from external devices, first of all, check the voltage of the NONAME tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
For owners of the DSL-24L31E TV, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH -----------> DAEWOO DSL-24L31E, Main: MST6M182VG-T7S 4703-M182T7-A3235K01, Panel: K236WL
To reduce the backlight current in LED drivers with a PWM controller MP3389EF (MP3389), or its analogue OB3362VP (28 pin), it is necessary to proportionally increase the total resistance of the resistors from pin 9 (ISET) to the chassis. The maximum current in each of the 12 channels (in milliamps) for the resistance Rset (in kilo-ohms) is determined from the ratio 1000 * 1.22V / Rset. With a parallel connection of channels, currents are summed.
Repair MainBoard
The appearance of the MainBoard MST6M182VG-T7S is shown in the figure below:
MST6M182VG-T7S can be used in TVs:
DAEWOO DSL-24L31E (Panel K236WL), ERISSON 23LEK14 (Panel 1080p Full HD 1920x1080), ERISSON 19LEK14 (Panel M185BGE-L22 Rev.C1), HYUNDAI H-LED22V5 (Panel LM215WF4), HYUNDAI H-LED24V11 (Panel LM230WF5 (TL)(D1) ), ROLSEN RL-17L1002U
(Panel LTN173KT02 ), RUBIN RB-19SL1U WH (Panel 19 ").
The appearance of the power supply
Main features of the DAEWOO DSL-24L31E device:
Installed matrix (LED-panel) K236WL.
The matrix control uses the Timing Controller (T-CON) M236HGE-P02.
The LED driver 4710-B33620-A3225K41 is used to power the backlight LEDs, it is controlled by the MP3389EF PWM controller. As power elements of the LED driver, keys of the type ME15N10-G are used.
The necessary supply voltages for all nodes of the DAEWOO DSL-24L31E TV are generated by the K40L1 power module or its analogs using OB5269CP microcircuits and N-FET TO-220 type power switches.
MainBoard - the main board (motherboard) is an MST6M182VG-T7S module, using IT6633E-P, LM1117 (3.3) microcircuits, YD1517P, 25Q32 and others.
The NONAME tuner provides TV reception and channel tuning.