Technical description and composition of the ROLSEN RL-42B04F TV, panel type and modules used. The composition of the modules.ROLSEN
Model: RL-42B04F
Chassis / Version: RSAG7.820
Panel: LC420WUN (SB) (D2)
T-CON: LC420 / LC470WUN-SAA1 6870C-0243C
Inverter (backlight): KLS-EE42PIF18A REV: 1.0
PWM Inverter: BD9215AFV
MOSFET Inverter: FDB8447L
Trans Inverter: L1EF42A-09C11B-KD
Power Supply (PSU): HLP-2642WA RSAG7.820.1673 / ROH VER.F
PWM Power: LNK564PN (7), NCP33262 (PFC), NCP1396AD (15), 1579 (8)
MOSFET Power: K3569, 10N60C, 4820N (DIP-8)
MainBoard: RSAG7.820.1856 LCD42P69
IC MainBoard: CPU: MT8222ARUS, SDRAM: EM6AA160TSA-4G, SPI flash: MX25L3205, R2A15I08, TDA9886TS
Tuner: TDQ-6FT / W126H
Control: EN-31603R
RL-42B04F Specifications
ROLSEN RL-42B04F
General recommendations for TV LCD repair
Repair and diagnostics of any electronic device, in particular ROLSEN with RSAG7.820 chassis, it is advisable to begin with a careful external examination of the internal and external elements. Often, based on external signs and the nature of damage to elements, it becomes possible to draw some conclusions and determine a further algorithm for searching for a defect before taking the necessary measurements at control points. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred layer of paint on the resistors - all this for the repairman can be a significant clue in assumptions about the causes and consequences of a malfunction.
If the RL-42B04F TV does not turn on, does not emit any sounds when turned on, as well as no indicators on the front panel are lit or blinking, there is a high probability of a malfunction in the power module. In some cases, only the stabilizer or power converter of the control processor may be faulty, which is typical for some ROLSEN models. When repairing a power supply, it is advisable to start diagnostics with checking the mains fuse and electrolytic capacitors of the filters of the secondary rectifiers of the converter. In the event of a break in the fuse, the cause should be sought in the power semiconductor elements of the pulse converter of the main power supply unit. First of all, it is necessary to check the diodes of the mains voltage rectifier bridge and the power switch (keys) of the K3569 10N60C converter.
Mos-Fet switches used in switching power supplies (SMPS) rarely fail without reasons that must be looked for by checking other circuit elements. Breakdown is often caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or breakdown of resistors in stabilization circuits. The PWM controller microcircuit LNK564PN (7), 33262 PAST (8), NCP1396AG (15) 1579 (8) 4820N (8) can also cause a breakdown of the converter power switch.
Sometimes the ROLSEN RL-42B04F TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or the lamps themselves, which can be checked by replacing. In such cases, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the inverter itself, including in the power supply unit (power supply unit). When disabling the inverter protection (to enable diagnostics), special care must be taken due to the risk of failure of the power components. After the completion of all repair work, it is imperative to restore the protection circuits for the full and safe further operation of the TV by the user.
Repair of the RSAG7.820.1856 LCD42P69 motherboard must begin with diagnosing and checking all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. In some cases it is necessary to check or replace (if necessary) elements of the MB (SSB) board - R2A15I08 TDA9886TS. In cases where a BGA processor is used, its malfunction is usually detected by a local warm-up method.
Attention to users! Self-repair of the ROLSEN RL-42B04F TV without proper qualifications and experience can lead to its complete non-repairability!
The appearance of MainBoard RSAG7.820.1856 is shown in the figure below:RSAG7.820.1856
RSAG7.820.1856 can be used in TVs:
ROLSEN RL-26A09105U (Panel HS26L02 CMO), ROLSEN RL-42B04F (Panel LC420WUN (SB)(D2)).
Additionally by PSU
The RL-42B04F model uses an HLP-2642WA power supply with a PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a step-up converter based on a 33262 PWM regulator, which excludes the charging current of the electrolytic capacitor of the mains rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the converter operation, the envelope of high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The serviceability of the PFC unit can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the network rectifier in operating mode.
External view of the power supply
The main features of the ROLSEN RL-42B04F device:
Installed matrix (LCD panel) LC420WUN (SB) (D2).
Matrix control uses the LC420 Timing Controller (T-CON).
To power the backlight lamps, the KLS-EE42PIF18A inverter is used, controlled by the BD9215AFV PWM controller. The transformer L1EF42A-09C11B-KD is installed in the inverter converter. The keys of the FDB8447L type are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-42B04F TV is carried out by the HLP-2642WA power module, or its analogs using LNK564PN (7), NCP33262 (PFC), NCP1396AD (15), 1579 (8) power switches and power switches of the K3569 type, 10N60C, 4820N (DIP-8).
MainBoard - the main board (motherboard) is an RSAG7.820.1856 module, using CPU: MT8222ARUS chips, SDRAM: EM6AA160TSA-4G, SPI flash: MX25L3205, R2A15I08, TDA9886TS and others.
The TDQ-6FT / W126H tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUN-SBD2
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: 450 cd / m²
Contrast Ratio: 1300: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering)
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: EEFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V.
ROLSEN RL-42B04F TV with LCD LC420WUN, 42 "(106 cm) 16: 9 diagonal. Dynamic contrast ratio 10000: 1 is provided by special control of the backlight depending on the illumination of areas in the scene. The design and technical capabilities of the TV provide viewing broadcasts and films 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 media file formats: MP3, JPEG.
Speaker power 16 W (2x8 W) is provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), S-Video, VGA, HDMI x3, USB x2. 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.
Attention! ROLSEN RL-42B04F LCD TV panel LC420WUN (SB) (D2) is its most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!