Technical description and composition of the TV SHARP LC-32LE340, type of panel and applicable modules. The composition of the modules.SHARP LED
Model: LC-32LE340 LC-32LE340RUX
Chassis / Version: 17MB70
Panel: LC320EUN (SD) (V1)
T-CON: V6 32/42/47 FDH TM120HZ 6870C-0368A v0.6
Power Supply (PSU): 17PW07-2
PWM Power: AN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down)
MOSFET Power: FQPFN50C, A04842
MainBoard: 17MB70-5P
IC MainBoard: K9F1G08U0D, K4T1G084QF
Tuner: TDTC-G605D
Technical Specifications LC-32LE340
SHARP LC-32LE340
General repair guidelines for TV LCD LED
Possible malfunctions
- SHARP LC-32LE340 does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In such cases, the power source 17PW07-2 is usually faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in 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 at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) AN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down), if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
In such cases, the most likely malfunction of the LED backlight elements. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to detect a break in the line of LEDs without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 17MB70-5P motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements K9F1G08U0D, K4T1G084QF requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages on the terminals of the TDTC-G605D tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Owners and users of the SHARP LC-32LE340 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
1. Service Manual with Schematic Diagram 70 pages of 2011 on the LC-32LE240M, LC-32LE340M.
2. Service Manual with Schematic Diagram 140 pages of 2012 on the model LC-32LE340E, LC-40LE340E, LC-32LE340EV, LC-40LE340EV, LC-32LE340RU, LC-40LE340RU, LC-32LE343E, LC-40LE343E
The appearance of the MainBoard 17MB70-5P is shown in the figure below:17MB70-5P
The appearance of the power supply
Main features of the SHARP LC-32LE340 device:
Installed matrix (LED-panel) LC320EUN (SD) (V1).
The matrix control uses the Timing Controller (T-CON) V6.
The necessary supply voltages for all nodes of the SHARP LC-32LE340 TV are generated by the 17PW07-2 power module or its analogs using AN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down) microcircuits and power switches type FQPFN50C, A04842.
MainBoard - the main board (motherboard) is a 17MB70-5P module, using K9F1G08U0D, K4T1G084QF and others.
The TDTC-G605D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUN-SDV1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V