Technical description and composition of the ROLSEN RL-42D1309FT2C TV, panel type and modules used. The composition of the modules.ROLSEN LED
Model: RL-42D1309FT2C
Chassis / Version: JUC7.820.00125910
Panel: C420F13-E2-A (G4)
LED driver (backlight): integrated into PSU
PWM LED driver: NCS1002-D
MOSFET LED driver: AOD4504
Power Supply (PSU): R-HS100D-1MF12
PWM Power: FA5591, NCP1251A, NCP1271A
MOSFET Power: 13N50C, 7N65
MainBoard: JUC7.820.00125910
IC MainBoard: 25Q64, TPS54428 IAGMF, RT9108NB
Tuner: CH DM121 C816RH
RL-42D1309FT2C Specifications
ROLSEN RL-42D1309FT2C
General recommendations for TV LCD LED repair
Possible manifestations of defects
- ROLSEN RL-42D1309FT2C TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
Most often, with similar manifestations, the main power module R-HS100D-1MF12 turns out to be faulty. It is necessary to measure the output voltages in its secondary circuits, and in the event of their complete absence, the serviceability of the power switches (13N50C, 7N65) and rectifier diodes should be checked for a possible breakdown (short circuit).
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers FA5591, NCP1251A, NCP1271A, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
Usually, in such cases, a malfunction is detected in the nodes of the backlight of the LED panel. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED bars for a break without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light one 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off, or pierced in the K / Z.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the JUC7.820.00125910 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - 25Q64, TPS54428 IAGMF, RT9108NB which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its pins with the board (detected by warming up).
Before changing the CH DM121 C816RH tuner, if it is not possible to tune to television 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
Once again, we remind TV users: you should not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> ROLSEN RL-42D1309FT2C, Main: JUC7.820.00125910, Panel: C420F13-E2-A (G4)
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> R-HS100D-1MF12 - Hitachi XR2.908.184DL HSM35D-1MF Power supply
The appearance of the MainBoard JUC7.820.00125910 is shown in the figure below:JUC7.820.00125910
JUC7.820.00125910 can be used in TVs:
DEXP F55B7200C (Panel C550F14-E6-L), DEXP F43B7200C (Panel C430F14-E1-L).
External view of the power supply
The main features of the ROLSEN RL-42D1309FT2C device:
The matrix (LED-panel) C420F13-E2-A (G4) is installed.
A converter combined with a power supply is used to power the backlight LEDs and is controlled by the NCS1002-D PWM controller. The keys of the AOD4504 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the ROLSEN RL-42D1309FT2C TV is carried out by the R-HS100D-1MF12 power supply module, or its analogs using FA5591, NCP1251A, NCP1271A microcircuits and 13N50C, 7N65 power switches.
MainBoard - the main board (motherboard) is a JUC7.820.00125910 module using 25Q64, TPS54428 IAGMF, RT9108NB and others.
Tuner CH DM121 C816RH provides reception of television programs and tuning to channels.
ROLSEN RL-42D1309FT2C TV with LCD C420F13-E2-A, 42 "(107 cm) diagonal in 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 900,000: 1 is achieved by special control The LCD-panel of the TV is equipped with direct backlighting with rear-mounted LEDs - Direct LED. It is possible to 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, NTSC Graphic processing and digital signal shaping is performed in 480i, 480p, 576i, 576p, 720p, 1080i standards Supported multimedia file formats: MP3, MPEG4, Xvid, MKV, JPEG.
Speaker power of 16 W (2x8 W) is provided by two speakers. Uses NICAM stereo signal processing system and Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x3, 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 digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: with stand 966x620x260 mm, without stand 966x571x79 mm.
TV weight: 9.3 kg.
Attention! Panel C420F13-E2-A (G4) LED TV ROLSEN RL-42D1309FT2C is an expensive and unreliable element.
Do not allow 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 unrepairable.