Technical description and composition of the TV SHARP LC-39LE751RU, type of panel and applicable modules. The composition of the modules.SHARP LED
Model: LC-39LE751RU
Panel: V390HK1-LE6 Rev. C4
LED backlight: C-1-1 078616 N
T-CON: T-CON V420HK1-CS5
LED driver (backlight): L390H1-1EE // L390H1-1EK-C111A
Power Supply (PSU): RDENCA459WJQZ FSP139-4F01
PWM Power: FAN7930CMX (PFC), SSC9522S, STR-A6069H, MP1583DP
MOSFET Power: AOTF5N50, AOTF7N60, AP72T02GH
MainBoard: DUNTKG135 - QPWBXG135WJN1
IC MainBoard: CPU: MT41J128M16JT; NAND Flash: MT29F2G08ABAEAWP; SOUND: STA333BW;
Tuner: Si2178-A20-GMR
Control: GB058WJSA.
Technical Specifications LC-39LE751
SHARP LC-39LE751RU
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs SHARP LC-39LE751RU, as well as other electronic devices, it is recommended to start with an external examination of the external and internal elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
Sometimes the SHARP LC-39LE751RU TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the FSP139-4F01 RDENCA459WJQZ common power module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself for no reason that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If, when you turn on the TV, the image appears and immediately disappears, or is missing initially when you turn on, but the sound has other functions that work, there is a high probability of a malfunction of the LED driver (power converter for the backlight LEDs of the V390HK1-LE6 Rev.C4 panel). In such cases, the general power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
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 to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
If the DUNTKG135 QPWBXG135WJN1 motherboard is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
It should be remembered! Attempts to repair the TV SHARP LC-39LE751RU, 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!
Service Manual with Schematic Diagram 166 pages of 2013 ----------------> LC-39LE750E, LC-39LE750V, LC-39LE751E, LC-39LE751K, LC-39LE751RU, LC-39LE751V, LC-39LE752E, LC-39LE752V, LC-50LE750E, LC-50LE750V, LC-50LE751E, LC-50LE751K, LC-50LE751RU, LC-50LE751V, LC-50LE752E, LC-50LE752V, LC-39LE750E (B), LC-39LE750V (B), LC-39LE751E (B), LC-39LE751K (B), LC-39LE751RU (B), LC-39LE751V (B), LC-39LE752E (B), LC-39LE752V (B), LC-50LE750E (B), LC-50LE750V (B), LC-50LE751E (B), LC-50LE751K (B), LC-50LE751RU (B), LC-50LE751V (B).
The appearance of the MainBoard DUNTKG135 is shown in the figure below:
DUNTKG135
DUNTKG135 can be used in TVs:
SHARP LC-39LE751RU (Panel V390HK1-LE6 Rev.C4), SHARP LC-60LE651RU (Panel R1JE600D3GV2AY).
PSU Advanced
The RDENCA459WJQZ power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on the FAN7930CMX PWM controller, which evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the SHARP LC-39LE751RU device:
Installed matrix (LED panel) V390HK1-LE6 Rev. C4.
The matrix control uses the Timing Controller (T-CON) T-CON.
The LED driver L390H1-1EE is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the SHARP LC-39LE751RU TV are generated by the RDENCA459WJQZ power supply module or its analogs using FAN7930CMX (PFC), SSC9522S, STR-A6069H, MP1583DP microchips and power switches of the AOTF5N50, AOTF7N60, AP72T02GH type.
MainBoard - the main board (motherboard) is a DUNTKG135 module, using CPU chips: MT41J128M16JT; NAND Flash: MT29F2G08ABAEAWP; SOUND: STA333BW; and others.
The Si2178-A20-GMR tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V390HK1-LE6
Type: a-Si TFT-LCD, Panel
Diagonal size: 39 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 853.92x480.33 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 3500: 1
Display Colors: 1.07B (8-bit + Hi-FRC), CIE1931 68%
Response Time: 6.5 (G to G)
Frequency: 120Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (4 ch, 10-bit), 92 pins
Voltage: 12.0V