Technical description and composition of the HARPER 16R575 TV, panel type and modules used. The composition of the modules.HARPER LED
Model: 16R575
Chassis / Version: HK.T.RDA8501CV03
Panel: NT156WHM-N32 V8.0
LED backlight: EDGE LED
T-CON: NT156WHM-N11 / N21 47-6001308
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): Adapter 12V
MainBoard: HK.T.RDA8501CV03
IC MainBoard: SPI FLASH: 25Q32, AUDIO: YD1517
Tuner: NoName
Specifications 16R575
HARPER 16R575
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TV HARPER 16R575 does not turn on and does not show any signs of operability at all. No response to the remote control and front panel control buttons.
With such manifestations, the adapter power supply usually fails.
External power supply Adapter 12V is not always subject to repair, especially since the owner can purchase it on his own. But, in some cases, it makes sense to open it and eliminate simple typical defects inherent in converters in pulse sources. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
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 controllers (PWM), if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- There is no picture, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine an open circuit in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then you need to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction, or dual LEds are used, then the PN transition of the emergency zener diode can indirectly serve as an indicator of serviceability. In the event of a malfunction of the LED-a, the PN-transition of the zener diode will either be cut off or broken through in the SC.
- 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 HK.T.RDA8501C 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). Complex repair of MB (SSB) is possible only in a service center with the necessary equipment. Checking or replacing SPI FLASH: 25Q32, AUDIO: YD1517 elements requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by the warm-up method.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the NoName tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Remember! Attempts to self-repair the HARPER 16R575 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 FIRMWARE FOR SPI FLASH -----------> HARPER 16R575, Main: HK.T.RDA8501C V03, Panel: NT156WHM-N32 V8.0
The appearance of the MainBoard HK.T.RDA8501CV03 is shown in the figure below:HK.T.RDA8501CV03
The main features of the HARPER 16R575 device:
Installed matrix (LED-panel) NT156WHM-N32 V8.0.
Matrix control uses NT156WHM-N11 Timing Controller (T-CON).
A converter combined with the HK.T.RDA8501CV03 main board is used to power the backlight LEDs.
To power all the internal components of the HARPER 16R575 TV, an external adapter type 12V is used.
MainBoard - the main board (motherboard) is a HK.T.RDA8501CV03 module, using SPI FLASH: 25Q32, AUDIO: YD1517 and others.
Tuner NoName provides reception of television programs and tuning to channels.
HARPER 16R575 TV with LCD NT156WHM-N32, diagonal size 15.6 "(40 cm) 16: 9. The required screen brightness of 180 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 40,000: 1 is achieved by special control of the LEDs. LED backlighting technology for this TV model.It is possible to view images in high quality HD at a resolution of 1366x768 pixels in a graphic resolution of 720p (HD Ready) Supported multimedia file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG ...
Speaker power 10 W (2x5 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 x2, component, VGA, HDMI, USB. A headphone output is provided.
The power consumed by the TV operating in mains mode is 20 W.
Dimensions: with stand 375x280x140 mm, without stand 375x240x45 mm.
TV weight: 1.2 kg.
Attention! HARPER 16R575 LED TV panel NT156WHM-N32 V8.0 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.