Technical description and composition of the LG 39LN5100 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 39LN5100 CC
Chassis / Version: LB35B
Panel: HC390DUN-VCFP1-21XX
LED backlight: LG Innotek POLA2.0 39 A / B Type Rev 0.0
LED driver (backlight): integrated into PSU
PWM LED driver: MAP3202 (MAP3202SIRH)
MOSFET LED driver: FDT86106, STF10NM60N
Power Supply (PSU): EAX64905301 (2.4) REV4.0 LGP3739-13PL1 PLDD-L204A
PWM Power: SSC1S311A, NR891D
MOSFET Power: STP10NM60N
MainBoard: EAX65027106 (1.0)
IC MainBoard: CPU: LGE6841, SPI Flash: 25L6406E
Tuner: TDSH-G501D (B) EBL61200403
Control: IR: EBR76405801
Appearance
LG 39LN5100
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 39LN5100 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
With such manifestations, a malfunction is most likely to be detected in the EAX64905301 power supply module. It is necessary to measure its output voltages and, if they are absent, check the power switches (STP10NM60N) and rectifier diodes for the probability of short circuit in the converters.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) SSC1S311A, NR891D, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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. 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the EAX65027106 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: LGE6841, SPI Flash: 25L6406E. BGA chip malfunctions are usually easy to detect by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the TDSH-G501D (B) EBL61200403 tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to self-repair the LG 39LN5100 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!
schematic diagram -------------> LG 39LN5100 Chassis LB35B
The appearance of the MainBoard EAX65027106 is shown in the figure below:EAX65027106
The appearance of the power supply
Main features of the device LG 39LN5100:
Installed matrix (LED-panel) HC390DUN-VCFP1-21XX.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the MAP3202 PWM controller (MAP3202SIRH). As the power elements of the LED driver, keys of the type FDT86106, STF10NM60N are used.
The necessary supply voltages for all nodes of the LG 39LN5100 TV are generated by the EAX64905301 power module, or its analogs using SSC1S311A, NR891D microcircuits and STP10NM60N type power switches.
MainBoard - the main board (motherboard) is an EAX65027106 module, using CPU chips: LGE6841, SPI Flash: 25L6406E and others.
Tuner TDSH-G501D (B) EBL61200403 provides the reception of television programs and tuning to channels.