Technical description and composition of the ROLSEN RL-32L700U3D TV, panel type and modules used. The composition of the modules.ROLSEN LED
Model: RL-32L700U3D
Chassis / Version: MST6M48
Panel: LC320EXN (SE) (P1)
T-CON: LC320EXN 6870C-0414A
LED driver (backlight): integrated into PSU
PWM LED driver: OB2273
MOSFET LED driver: ME60N03, 3N80C
Power Supply (PSU): K-75L1
PWM Power: OB2273
MOSFET Power: SW10N65
MainBoard: MST6M182-T8B (ver A4) MST6M48
IC MainBoard: M6M8-C3P284-00583, Spi Flash: 25Q32, PAM8610. RT8284N
Tuner: CDT-3FP2I2-31
RL-32L700U3D Specifications
ROLSEN RL-32L700U3D
General recommendations for TV LCD LED repair
If the ROLSEN RL-32L700U3D 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 a K-75L1 power supply module malfunction. In some cases, only the processor power regulator may be faulty. 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 rectifier bridge of the mains voltage and the power switch (keys) of the SW10N65 converter. The complete inoperability of the power supply unit can be caused by a short circuit of the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads.
It should be borne in mind that in the practice of repair, it is extremely rare for key transistors in switching power supplies (SMPS) to fail without reasons that should be looked for by checking other components, for example, a key breakdown can provoke faulty elements of damper circuits, or dried electrolytic capacitors or broken primary resistors power supply circuits involved in the stabilization process. In this case, all semiconductor elements of the binding of the OB2273 PWM regulator microcircuit are subject to verification, which it is advisable to check by replacement.
Sometimes the ROLSEN RL-32L700U3D TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a possibility of a malfunction of the LED driver - the LC320EXN (SE) (P1) panel backlight LED power converter, or an open circuit in the LED circuit is possible. In such cases, first of all, you need to make sure that the electrolytic capacitors of the filter are in good working order for the backlight unit.
The lack of backlighting often occurs due to an open circuit in the LED circuit. It becomes necessary to disassemble the panel and check the LEDs themselves, as well as the contact connections in the connectors and the ration of the connector pins.
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.When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or microcircuit power converters and, if necessary, update the software (software).
If it is not possible to replace the MB (SSB) board, it is necessary to check the serviceability of its elements - M6M8-C3P284-00583, Spi Flash: 25Q32, PAM8610. RT8284N. Defective components must be replaced.
Before changing the CDT-3FP2I2-31 tuner, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Remember! Attempts to repair the ROLSEN RL-32L700U3D TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> K-75L2 K-75L1 Power supply
The appearance of the MainBoard JUC7.820.00085101 is shown in the figure below:JUC7.820.00085101
JUC7.820.00085101 can be used in TVs:
BBK 22LEM-3082/FT2C (Panel C215X14-E2-P(G2)), BBK 24LEM-1004/T2C (Panel C236X13-E4-C(G2), BBK 19LEM-1004/T2C (Panel C185X14-E3-P (G2)), BBK 19LEM-1001/T2C (Panel M185X12-E1-P (G4) ), ROLSEN RL-19E1308T2C (Panel C185X14-E3-P(G2)), ROLSEN RL-22E1308FT2C (Panel C215X14-E2-P(G2)), ROLSEN RL-24E1302T2C (Panel C236X13-E2-C (G2) ).
External view of the power supply
The main features of the ROLSEN RL-32L700U3D device:
Installed matrix (LED-panel) LC320EXN (SE) (P1).
Matrix control uses the LC320EXN Timing Controller (T-CON).
To power the backlight LEDs, a converter combined with a power supply is used, controlled by the OB2273 PWM controller. The keys of the ME60N03, 3N80C type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-32L700U3D TV is carried out by the K-75L1 power module, or its analogs using OB2273 microcircuits and power switches of the SW10N65 type.
MainBoard - the main board (motherboard) is an MST6M182-T8B module, using M6M8-C3P284-00583 microcircuits, Spi Flash: 25Q32, PAM8610. 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: LC320EXN-SEP1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
ROLSEN RL-32L700U3D TV with LCD LC320EXN, diagonal size 32 "(81 cm) 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 200,000: 1 is achieved by special control of LED operation. The LED panels of this TV are equipped with edge LED backlighting.
There is support for 3D images using passive polarization technology. You can view images in high quality HD at a resolution of 1366x768 pixels in 720p (HD Ready). 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 standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. 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.
The power consumed by the TV in operating mode from the network is 110 watts.
TV weight: without stand: 10.5 kg.
Attention! The LC320EXN (SE) (P1) panel of the ROLSEN RL-32L700U3D LED TV is an expensive and unreliable element.
Avoid 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.