Technical description and composition of the ROLSEN RL-26X20 TV, panel type and modules used. The composition of the modules.ROLSEN
Model: RL-26X20
Panel: LC260WX2
T-CON: 12v
Inverter (backlight): KLS-EE26CI-M / S (P)
Trans Inverter: IT-094 0663
Power Supply (PSU): DMSM-S0007D
PWM Power: VIPER22A (Standby), L6562D (PFC), L6598D (PWM Resonant 16pin)
MOSFET Power: P11NM60, W20NM60
MainBoard: DML-4126
IC MainBoard: CPU: SDA5550, EEPROM 24C16, flash A29040BL-70
Tuner: TECH294PG40B (D)
Control: LC03-AR028A
RL-26X20 Specifications
ROLSEN RL-26X20
General recommendations for TV LCD repair
ROLSEN with chassis, like other TVs, it is advisable to start repairing with a careful examination of external and internal elements and modules. 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. Electrolytic capacitors of filters with a swollen body, as well as ring cracks formed in the soldering of the leads of heating elements or a layer of coal on burnt resistors sometimes prompt the repairman about the causes of the malfunction and the possible consequences.
If ROLSEN RL-26X20 does not turn on, none of the control lamps on the front panel will light up or blink, therefore, there is a very high probability of malfunction of the DMSM-S0007D power supply module. In some cases, only the processor power regulator may be faulty. In general, first of all, it is necessary to check the electrolytic capacitors of the filters of the secondary rectifiers and the fuse at the mains input. If it is cut off, then the diodes of the rectifier bridge and the key transistor of the converter, which can be located either on a separate heatsink or integrated with a PWM controller into a common microcircuit, should be checked for a breakdown of PN junctions. The options are P11NM60, W20NM60.
It should be remembered that in the practice of repair, usually power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the reason that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dry electrolytic capacitors or broken resistors in the primary circuit, or the chip of the PWM controller VIPER22A (8) // L6562D (8) // L6598D (16) may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the ROLSEN RL-26X20 TV does not have a picture, but there is sound, the fault should be sought in the backlight power converter (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overestimated ESR. All necessary precautions must be taken when disabling the inverter protection during diagnostics and do not leave it disabled after repair is completed.
In some cases, it is necessary to check or replace (if necessary) elements of the MB (SSB) board - EEPROM 24C16, flash A29040BL-70. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
Attention to users! Self-repair of the ROLSEN RL-26X20 TV without proper qualifications and experience can lead to its complete non-repairability!
Schematic Diagram 7+ pages on RL-26X20 model
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> ROLSEN RL-26X20
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> ROLSEN RL-26X20
The appearance of the MainBoard DML-4126 is shown in the figure below:DML-4126
Additionally by PSU
The RL-26X20 TV is equipped with a DMSM-S0007D power module using a PFC (Power Factor Correction) circuit that acts as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the L6562D PWM regulator does not allow connecting the electrolytic capacitor of the input rectifier filter to the network directly through open diodes, when the charge current is determined by its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current follows the phase and shape of the sinusoid of the input voltage. Checking the health of the PFC unit is carried out by measuring the constant voltage across the capacitor of the network rectifier. In working mode it should be about 380V, in standby about 300V.
External view of the power supply
The main features of the ROLSEN RL-26X20 device:
Installed matrix (LCD panel) LC260WX2.
Matrix control uses 12v Timing Controller (T-CON).
The KLS-EE26CI-M inverter is used to power the backlight lamps. The transformer IT-094 0663 is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-26X20 TV is carried out by the DMSM-S0007D power module, or its analogs using the VIPER22A (Standby), L6562D (PFC), L6598D (PWM Resonant 16pin) chips and power switches of the P11NM60, W20NM60 type.
MainBoard - the main board (motherboard) is a DML-4126 module, using CPU chips: SDA5550, EEPROM 24C16, flash A29040BL-70 and others.
Tuner TECH294PG40B (D) provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC260WX2-SLE4
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 900: 1
Display Colors: 16.7M (8-bit)
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TV ROLSEN RL-26X20 with LCD LC260WX2, diagonal size 26 "(66 cm) 16: 9. Brightness of the screen 450 cd / m² provided by CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 500: 1. It is possible to view images in high quality HD at a resolution of 1280x720 pixels in the standard of graphic decomposition 720p (HD Ready). Input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and formation of a digital signal occurs in standards 480i, 480p, 576i, 576p, 720p Supported media file formats: MP3, WMA, MPEG4, VideoCD, SVCD, Picture CD, 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, audio x3, S-Video, component, SCART x2, RGB, VGA, DVI HDCP. 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.
The power consumed by the TV in operating mode from the network is 140 watts.
Dimensions: with stand 694x597x270 mm, without stand 694x529x122 mm.
TV weight: 16 kg.
Attention! ROLSEN RL-26X20 LCD TV panel LC260WX2 is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!