Technical description and composition of the SKYLINE 32U5020 TV, panel type and modules used. The composition of the modules.SKYLINE LED
Model: 32U5020
Chassis / Version: CV3663BH-Q32
Panel: CX315DLEDM
T-CON: ST3151A07-1-XCV-3
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267S
MOSFET LED driver: TO-252 20A 150V
Power Supply (PSU): integrated into MainBoard
PWM Power: LD5535GL
MOSFET Power: TO-252 5A 700V
MainBoard: CV3663BH-Q32
IC MainBoard: SPI FLASH: W25Q64BV
Tuner: CDT-9NT372-RF01 & CDT-9NS161-RD41J
Specifications 32U5020
SKYLINE 32U5020
General recommendations for TV LCD LED repair
Possible malfunctions
- The SKYLINE 32U5020 TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
A malfunction in such cases should be looked for in the elements of the power source - the mains voltage converter (AC / DC), which is located on the MainBoard CV3663BH-Q32. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (TO-252 5A 700V) and rectifier diodes in the converters for a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is often cut off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM regulators (PWM) LD5535GL, if they have no visible damage to the case and an outright short circuit between the pins, are usually checked by replacing.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or open circuit), sometimes in the violation of the contact connections of the LED strips.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Usually, Chinese multimeters lightly light up one 3-volt LED if you connect the probes to it in the forward direction (red probe to the anode, black to the cathode). For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or broken into the K / Z.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the CV3663BH-Q32 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 complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its SPI FLASH: W25Q64BV chips and other possible faulty components. Failures associated with BGA soldering technologies are usually easily diagnosed by the warm-up method.
Before changing the tuner CDT-9NT372-RF01 & CDT-9NS161-RD41J, 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 terminals of the tuner and check the software for correctness. The pulses of data exchange between the tuner and the processor can be monitored with an oscilloscope
Once again, we remind TV users: do not attempt 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.
Additional MainBoard Repair
The appearance of the MainBoard CV3663BH-Q32 is shown in the figure below:
CV3663BH-Q32
The main features of the SKYLINE 32U5020 device:
Installed matrix (LED panel) CX315DLEDM.
Matrix control uses Timing Controller (T-CON) ST3151A07-1-XCV-3.
To power the backlight LEDs, a converter combined with the CV3663BH-Q32 main board is used, controlled by the BIT3267S PWM controller. TO-252 20A 150V switches are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using LD5535GL microcircuits and TO-252 5A 700V power switches.
MainBoard - the main board (motherboard) is a CV3663BH-Q32 module, using SPI FLASH chips: W25Q64BV and others.
Tuner CDT-9NT372-RF01 & CDT-9NS161-RD41J provides reception of television programs and tuning to channels.
TV SKYLINE 32U5020 with LCD CX315DLEDM, diagonal size 32 "(81 cm) 16: 9 format. The required screen brightness of 230 cd / m2 is provided by LED backlighting. Dynamic contrast ratio of 70,000: 1 is achieved by a special control of the LEDs. the screen of this TV model is realized with LED backlighting.
There is a convenient function of recording TV programs with subsequent viewing at another time (TimeShift).
The CX315DLEDM display and CV3663BH-Q32 main board software can display HD images at 1366x768 pixels in 720p (HD Ready). Supported media file formats: MP3, MPEG4, MKV, JPEG.
Speaker power 12 W (2x6 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, component, HDMI x3, USB. A headphone output is provided.
The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The power consumed by the TV operating in mains mode is 48 W.
Dimensions: with stand 722x460x181 mm, without stand 722x423x82 mm.
TV weight: with stand: 4 kg, without stand: 3.9 kg.
Attention! The CX315DLEDM panel of the SKYLINE 32U5020 LED TV 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 non-repairable.