Technical description and composition of the ROLSEN RL-42L12002F TV, panel type and modules used. The composition of the modules.ROLSEN LED
Model: RL-42L12002F
Chassis / Version: MST6M48 / 6M182 T7
Panel: LC420EUD (SD) (A1)
LED backlight: 3660L-0374A 42 V6 Edge FHD-3 Rev1.0 L-Type / R-Type
T-CON: V6 32/47/47 FHD 120Hz, P / N: 6870C-0358A Ver1.0
LED driver (backlight): 3PDGC20002A-R PCLF-D001 A Rev1.0
PWM LED driver: SW5509, SW1202
MOSFET LED driver: AO B414
Power Supply (PSU): K-250N1 REV: A01465-0101-0B301G
MainBoard: 471-01A3-64701G MST6M48 / 6M182 T7
IC MainBoard: Cpu: MST6M48 / 6M182, Spi Flash: 25Q32, Audio: PAM8610
Tuner: CDT-3FP2I2-31
RL-42L12002F Specifications
ROLSEN RL-42L12002F
General recommendations for TV LCD LED repair
Possible malfunctions
- The ROLSEN RL-42L12002F TV does not turn on, does not respond to the remote control and control panel buttons, does not light or blink indicators.
With similar manifestations, in some cases, the K-250N1 power supply module is faulty. It is then necessary to measure its output voltages and, in their absence, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and a short circuit between the terminals, are checked by replacing them with a known good one.
- There is no image, there is sound, it reacts to the remote control. Or the image may appear for a second when turned on and disappear immediately.
In such cases, a malfunction of the LED panel backlighting elements is most likely. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to identify an open circuit in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Usually, Chinese multimeters lightly light one 3-volt LED if you connect the probes to it in the forward direction (red probe to the anode, black to the cathode). For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of the LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the SC.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the 471-01A3-64701G motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - Cpu: MST6M48 / 6M182, Spi Flash: 25Q32, Audio: PAM8610 with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
If the TV operates normally from external devices, but does not tune to TV channels, the CDT-3FP2I2-31 tuner may be faulty. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Users and owners of TVs should remember that attempts to self-repair the ROLSEN RL-42L12002F TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
The appearance of the MainBoard 471-01A3-64701G is shown in the figure below:471-01A3-64701G
471-01A3-64701G can be used in TVs:
ROLSEN RL-42L12002F (Panel LC420EUD (SD)(A1)), RUBIN RB-26SL1U (Panel LC260EXN (SD)(A3) LED).
Main features of the ROLSEN RL-42L12002F device:
Installed matrix (LED panel) LC420EUD (SD) (A1).
Matrix control uses Timing Controller (T-CON) V6.
The LED driver 3PDGC20002A-R is used to power the backlight LEDs, it is controlled by the PWM controller SW5509, SW1202. The keys of the AO B414 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-42L12002F TV is carried out by the K-250N1 power module, or its analogs.
MainBoard - the main board (motherboard) is a 471-01A3-64701G module, using Cpu chips: MST6M48 / 6M182, Spi Flash: 25Q32, Audio: PAM8610 and others.
The CDT-3FP2I2-31 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420EUD-SDA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 5/8 (Tr / Td)
Frequency: 120Hz + 120Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (4 ch, 8/10-bit), 92 pins
Voltage: 12.0V
ROLSEN RL-42L12002F TV with LCD LC420EUD, 42 "(107 cm) diagonal, 16: 9 format. The required screen brightness of 450 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 100,000: 1 is achieved by special control of LED operation. The LED panels of this TV are equipped with Edge LED backlighting.The design and technical capabilities of the TV provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD) .Input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal formation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported multimedia file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG ...
Speaker sound system power 20 W (2x10 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x2, S-Video, component, VGA, HDMI x2, USB. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768, 1920x1080.
The power consumed by the TV in operating mode from the network is 140 watts.
Overall dimensions: without stand 1008x634x41 mm.
TV weight: 21.5 kg.
Attention! The LC420EUD (SD) (A1) panel of the ROLSEN RL-42L12002F LED TV is an expensive and unreliable element.
Do not allow any impacts on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.