Technical description and composition of the HARPER 32R575T TV, panel type and modules used. The composition of the modules.HARPER LED
Model: 32R575T
Chassis / Version: TP.MS3663S.PB818
Panel: HK315LEDM-JHA7H
LED driver (backlight): integrated into MainBoard
PWM LED driver: 8
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: TP.MS3663S.PB818
IC MainBoard: CPU: MSD3663LSA-SW, SPI Flash 25Q64
Tuner: CDT-9NT372-RF01
Specifications 32R575T
HARPER 32R575T
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TV HARPER 32R575T does not turn on, does not respond to the remote control and control panel buttons, does not light or blink indicators.
A fault 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 main board MainBoard TP.MS3663S.PB818. Its output voltages should be measured and, in their absence, the power switches (TO-252) and rectifier diodes should be checked for the probability of a short circuit in the converters.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually 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 controllers (PWM) PWM SOT23-6, if they have no visible damage to the case and an open short circuit between the pins, are usually checked by replacing.
- There is no picture, but there is sound and all other functions work. Sometimes, when turned on, the image appears and disappears for a second.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlighting. Often the reason is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver turns out to be faulty.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the TP.MS3663S.PB818 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 - CPU: MSD3663LSA-SW, SPI Flash 25Q64 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 (indicated by warming up).
Before changing the CDT-9NT372-RF01 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
Users and owners of TVs need to remember that attempts to repair the HARPER 32R575T TV on their own without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> HARPER 32R575T, Main: TP.MS3663S.PB818, Panel: HK315LEDM-JHA7H
The appearance of MainBoard TP.MS3663S.PB818 is shown in the figure below:TP.MS3663S.PB818
The main features of the HARPER 32R575T device:
Installed matrix (LED panel) HK315LEDM-JHA7H.
To power the backlight LEDs, a converter combined with the main board TP.MS3663S.PB818 is used, controlled by the PWM controller 8. The keys of the TO-252 type 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 SOT23-6 PWM microcircuits and TO-252 power switches.
MainBoard - the main board (motherboard) is a TP.MS3663S.PB818 module, using CPU chips: MSD3663LSA-SW, SPI Flash 25Q64 and others.
The CDT-9NT372-RF01 tuner provides reception of television programs and tuning to channels.
HARPER 32R575T LCD TV HK315LEDM-JHA7H, 32 "(81 cm) 16: 9. The required brightness of 230 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 70,000: 1 is achieved by special LED control. screen manufacturing technology of this TV model is realized with LED backlighting.It is possible to view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready ).Supported multimedia file formats: MP3, MPEG4, JPEG.
Speaker power 14 W (2x7 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 x2, USB. A headphone output is provided.
The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV operating in mains mode is 65 W.
Dimensions: with stand 730x471x179 mm, without stand 730x430x77 mm.
TV weight: 3.5 kg.
Attention! HK315LEDM-JHA7H panel of HARPER 32R575T 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.