Technical description and composition of the ROLSEN RL-42A700F3D TV, panel type and modules used. The composition of the modules.ROLSEN
Model: RL-42A700F3D
Chassis / Version: 471-01A6-64201G
Panel: LC420WUE-SDP1
Lamp backlight: 14 LAMP EEFL
T-CON: 6870C-0310C
Power Supply (PSU): MIP988A-K2
PWM Power: NCP1653A, LD7535, SG3525A
MOSFET Power: STF13N50Z
MainBoard: 471-01A6-64201G
IC MainBoard: CPU: MST6M48RHS-LF-Z1, SPI FLASH: 25Q32-104, DRAM: W971GG6JB-25
Tuner: CDT-3FP212-31
RL-42A700F3D Specifications
ROLSEN RL-42A700F3D
General recommendations for TV LCD repair
Possible malfunctions
- ROLSEN RL-42A700F3D TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
Most often, with similar manifestations, the main power module MIP988A-K2 is faulty. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches (STF13N50Z) and rectifier diodes for a possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key often breaks off.
The breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM regulators (PWM) NCP1653A, LD7535, SG3525A, if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- 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 immediately disappear.
These manifestations can be triggered by the power module, or by defects in the inverter, as well as by skewed currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter for the power supply of the inverter are in good working order, you should make sure that the lamps are in good condition, then you need to check the converter keys and the secondary windings of the transformers.
If, when diagnosing a malfunction, it is required to turn off the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are completed, it is imperative to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the 471-01A6-64201G 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 CPU elements: MST6M48RHS-LF-Z1, SPI FLASH: 25Q32-104 requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
If the TV operates normally from external devices, but does not tune into TV channels, the CDT-3FP212-31 tuner may be defective. 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.
Owners of the RL-42A700F3D TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> MIP988A-K2 Power supply
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> ROLSEN RL-42A700F3D, Main: 471-01A6-64201G, Panel: LC420WUE-SDP1
The appearance of the MainBoard 471-01A6-64201G is shown in the figure below:471-01A6-64201G
External view of the power supply
The main features of the ROLSEN RL-42A700F3D device:
Installed matrix (LCD panel) LC420WUE-SDP1.
Matrix control uses a Timing Controller (T-CON) 6870C-0310C.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-42A700F3D TV is carried out by the MIP988A-K2 power supply module, or its analogs using NCP1653A, LD7535, SG3525A microcircuits and STF13N50Z power switches.
MainBoard - the main board (motherboard) is a 471-01A6-64201G module, using CPU chips: MST6M48RHS-LF-Z1, SPI FLASH: 25Q32-104, DRAM: W971GG6JB-25 and others.
The CDT-3FP212-31 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUE-SDP1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (2H)
Brightness: 380 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs EEFL Without Driver
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V
ROLSEN RL-42A700F3D TV with LCD LC420WUE-SDP1, 42 "(107 cm) 16: 9 diagonal. Screen brightness of 400 cd / m² is backlit by CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio of 300000: 1 is provided by a special control of the backlight operation depending on the illumination of areas in the plot.
There is support for 3D images using passive polarization technology. The design and technical capabilities of the TV provide viewing of broadcasts and films 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 formation of a digital signal occurs 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, 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 mains is 240 W.
TV weight: without stand: 19.5 kg.
Attention! ROLSEN RL-42A700F3D LCD TV panel LC420WUE-SDP1 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!