Technical description and composition of the ROLSEN RL-20X31 TV, panel type and modules used. The composition of the modules.ROLSEN
Model: RL-20X31
Chassis / Version: PLVM01
Panel: LC201V02 (SD) (B1)
T-CON: LC201V02-SDA1
Inverter (backlight): AT-6201LG12 (BIT) Rev. C
PWM Inverter: FAN7311 / G52 / P2803NVG / ZEP17000
MainBoard: PLVM01
IC MainBoard: CPU: VCT49X3R F2 208010.000, MLT015GF; DC / DEC: 2576-3.3, 8050SD, AS1117 / 1.8; 2.5; 3.3 /, EPROM - A29040BL, EEPROM - A51CS, A21CS; Sound - TDA7266 P15V330WE
Tuner: TECH2949PS40B
RL-20X31 Specifications
ROLSEN RL-20X31
General recommendations for TV LCD repair
It is advisable to start repairing a ROLSEN TV with a PLVM01 chassis with a careful external examination of both internal and external elements. It often happens that visible damage to elements or connections helps determine the direction of troubleshooting. If ring cracks are found in the soldering of the element terminals or broken connecting tracks, swollen capacitors or charred resistors - all this may be characteristic signs of the causes or consequences of an already known typical malfunction.
If the RL-20X31 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 diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. If it breaks, the power elements of the transistors and diodes of the rectifier bridge should be checked for avalanche (thermal) breakdown.
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 can also cause the breakdown of the power switch of the converter.
If, when turning on the TV, the image appears and immediately disappears, or is absent initially when turned on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (backlight power converter). In such cases, the lamps, the inverter and the common power supply module must be checked, in which the electrolytic capacitors of the rectifier filter supplying the inverter must be checked. It should be remembered that when the protection is turned off in order to diagnose a malfunction, there is always a risk of failure of the power elements of the inverter. After repair, it is imperative to restore all standard converter protection circuits.
Diagnostics and repair of the PLVM01 motherboard is carried out by checking the functionality of the stabilizers or power converters of the module chips. In some cases, a software update is required. Repair of the board and replacement of VCT49X3 A29040BL MTL015GF microcircuits are made if the necessary equipment and the corresponding element base are available. Failures associated with the use of BGA soldering technologies can be localized by warming up.
Attention! Users and owners of RL-20X31 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that can lead to complete non-repairability of the device.
Additional MainBoard RepairThe appearance of the MainBoard PLVM01 is shown in the figure below:
PLVM01
The main features of the ROLSEN RL-20X31 device:
Installed matrix (LCD panel) LC201V02 (SD) (B1).
Matrix control uses Timing Controller (T-CON) LC201V02-SDA1.
To power the backlight lamps, an AT-6201LG12 (BIT) inverter is used, controlled by the FAN7311 / G52 / P2803NVG / ZEP17000 PWM controller.
The necessary supply voltages for all nodes of the ROLSEN RL-20X31 TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a PLVM01 module, using CPU chips: VCT49X3R F2 208010.000, MLT015GF; DC / DEC: 2576-3.3, 8050SD, AS1117 / 1.8; 2.5; 3.3 /, EPROM - A29040BL, EEPROM - A51CS, A21CS; Sound - TDA7266 P15V330WE and others.
Tuner TECH2949PS40B provides reception of TV programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-SDB1
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 12/13 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 12.0V
ROLSEN RL-20X31 TV with LCD display LC201V02, diagonal size 20 "4: 3. The brightness of the screen of 500 cd / m² is provided by backlighting CCFL (EEFL) fluorescent lamps. Contrast, as the ratio of maximum brightness to minimum, is 500: 1 The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC.Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p standards.
Speaker power 6 W (2x3W) 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 x2, S-Video, SCART, RGB, VGA. 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.
Dimensions: with stand 510x480x240 mm, without stand 510x435x86 mm.
TV weight: 9.5 kg.
Attention! ROLSEN RL-20X31 LCD TV panel LC201V02 (SD) (B1) is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!