Technical description and composition of the ROLSEN RL-42L700F3D TV, panel type and modules used. The composition of the modules.ROLSEN LED
Model: RL-42L700F3D
Chassis / Version: MST6M48
Panel: LC420EUN (SD) (F1)
LED driver (backlight): 3PEGC20008A-R
PWM LED driver: BD9262EFV
MOSFET LED driver: AOD482
Power Supply (PSU): 465-01A2-L6501G K-150S1
PWM Power: L6562A, OB2273, L6599A
MOSFET Power: 19N60, 10N60
MainBoard: 471-01A4-64801G VER.A4
IC MainBoard: M6M8-C3P284-00583, Spi Flash: 25Q32, RT8284N
Tuner: CDT-3FP2I2-31
RL-42L700F3D Specifications
ROLSEN RL-42L700F3D
General recommendations for TV LCD LED repair
Possible manifestations of defects
- ROLSEN RL-42L700F3D TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
In such cases, the fault should be looked for primarily in the 465-01A2-L6501G power supply module. Its output voltages should be measured and, in their absence, the serviceability of the power switches (19N60, 10N60) and rectifier diodes in the converters should be checked for possible breakdown.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and, less often, the current sensor in the source of the key.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) L6562A, OB2273, L6599A are usually checked by replacing them with new ones, or knowingly working properly.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlighting. The reason may 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 identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the 471-01A4-64801G 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). Complex repair of MB (SSB) is possible only in a service center with the necessary equipment. Checking or replacing elements M6M8-C3P284-00583, Spi Flash: 25Q32, RT8284N 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 the warm-up method.
The malfunction of the CDT-3FP2I2-31 tuner is established after checking the software and all supply voltages at its terminals. The I2C bus data exchange between the tuner and the processor can be monitored with an oscilloscope.
We remind users again! Attempts to repair the ROLSEN RL-42L700F3D TV on your own without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 465-01A2-L6501G K-150S1 Power supply
To reduce the backlight current in LED drivers with a BD9262EFV controller, you should proportionally increase the total resistance of the resistors from pin 23 (ISET) to the case.
Additional MainBoard RepairThe appearance of the MainBoard 471-01A4-64801G is shown in the figure below:
471-01A4-64801G
External view of the power supply
Main features of the ROLSEN RL-42L700F3D device:
Installed matrix (LED panel) LC420EUN (SD) (F1).
To power the backlight LEDs, the 3PEGC20008A-R LED driver is used, controlled by the BD9262EFV PWM controller. The keys of the AOD482 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-42L700F3D TV is carried out by the 465-01A2-L6501G power module, or its analogs using L6562A, OB2273, L6599A microcircuits and power switches of 19N60, 10N60 type.
MainBoard - the main board (motherboard) is a 471-01A4-64801G module, using M6M8-C3P284-00583 microcircuits, Spi Flash: 25Q32, RT8284N 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: LC420EUN-SDF1
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 (2H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
ROLSEN RL-42L700F3D TV with LCD LC420EUN, 42 "(107 cm) diagonal, 16: 9 format. The required screen brightness of 400 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 500,000: 1 is achieved by special control of the LED operation. The LED panels of this TV are equipped with edge LED backlighting.
There is support for 3D images using passive polarization technology. 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 at 1080p (Full HD). The input high-frequency or video signal can be processed in analog systems PAL, SECAM. Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power 16 W (2x8 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, component, VGA, HDMI x2, USB. A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768, 1920x1080.
The power consumed by the TV in operating mode from the network is 140 watts.
TV weight: without stand: 17 kg.
Attention! Panel LC420EUN (SD) (F1) LED TV ROLSEN RL-42L700F3D 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 non-repairable.