Technical description and composition of the HARPER 32R660TS TV, panel type and modules used. The composition of the modules.HARPER LED
Model: 32R660TS
Chassis / Version: CV338H-T42
Panel: CX315DLEDM
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: AOD4454
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: CV338H-T42 13
IC MainBoard: MSD6A338, MSB102KT, W25Q16, KLM4G1FEPD
Tuner: CDT-9NT372RF-10 (R842)
Specifications 32R660TS
HARPER 32R660TS
General recommendations for TV LCD LED repair
Possible malfunctions
- HARPER 32R660TS does not turn on, the indicators on the front panel do not light up or flash. The TV does not respond to control buttons and the remote control.
In such cases, the AC / DC converter of the mains voltage, which is combined with the CV338H-T42 main board, is often faulty. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches (TO-252) and rectifier diodes for a possible short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, 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 most often cut off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) PWM SOT23-6 are usually checked by replacing them with new ones, or knowingly working.
- 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.
In some of these cases, the malfunction is caused by the lack of display backlighting. The reason can be found in the malfunction of the LEDs, in the violation of the contact connections of the LED strips, or in the provision of their power supply (LED driver).
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 a single 3V 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 TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the CV338H-T42 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) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements MSD6A338, MSB102KT, W25Q16, KLM4G1FEPD. Malfunctions in BGA chips are usually easy to detect by warm-up.
If there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the outputs of the CDT-9NT372RF-10 (R842) tuner match. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
Remember! Attempts to self-repair the HARPER 32R660TS 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!
The appearance of the MainBoard CV338H-T42 is shown in the figure below:CV338H-T42
CV338H-T42 can be used in TVs:
BBK 32LEX-5023/T2C (Panel V320BJ6-Q01 Rev.C1 (TH32YS1705C0327)), BBK 32LEX-5024/T2C (Panel TH32YS1704D0089).
The main features of the HARPER 32R660TS device:
Installed matrix (LED panel) CX315DLEDM.
To power the backlight LEDs, a converter combined with the CV338H-T42 main board is used, controlled by the BIT3267 PWM controller. The keys of the AOD4454 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 CV338H-T42 module using MSD6A338, MSB102KT, W25Q16, KLM4G1FEPD and others.
Tuner CDT-9NT372RF-10 (R842) provides reception of television programs and tuning to channels.
HARPER 32R660TS TV with LCD CX315DLEDM, diagonal size 32 "(81 cm) 16: 9. The required brightness of the screen of 230 cd / m2 is provided by LED backlighting. Dynamic contrast ratio of 70,000: 1 is achieved by special control of the LEDs. The screen 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 a graphic resolution of 720p (HD Ready).
The 32R660TS TV is equipped with SMART software, built-in applications and the ability to work on the Internet. Internet connection can be made via Wi-Fi wireless connection. Supported media file formats: MP3, MPEG4, MKV, JPEG.
Speaker power 14 W (2x7 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
An 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 x2, Ethernet (RJ-45), Wi-Fi. 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 60 W.
Dimensions: with stand 730x465x180 mm, without stand 730x430x88 mm.
TV weight: 4.09 kg.
Attention! The HARPER 32R660TS LED TV panel CX315DLEDM 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.