Technical description and composition of the LG 32LN536U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LN536U
Chassis / Version: LD31B / LC36B / LL36B
Panel: NC320DXN (SA) (P1)
T-CON: 6870C-0370A TL2345ML, MAX9665E, TPS65170, TPS65194
LED driver (backlight): integrated into PSU; 70.3V 400mA
PWM LED driver: MAP3202
MOSFET LED driver: FDT86106, AP18N20GH
Power Supply (PSU): EAX64905001 (2.6) LGP32-13PL1
PWM Power: SSC1S311A (PWM flyback), NR891D (PWM Step-down 24/12)
MOSFET Power: MDF11N65B
MainBoard: EAX64891306 (1.1) EBR76922710
IC MainBoard: CPU: LGE2121-MS, DRAM: H5TQ2G630FR, NAND Flash: SAA36254746F VER 03.13.72, SPI Flash: 25Q80, SOUND: STA3808WF
Tuner: TDSQ-G601D (B)
Specifications 32LN536U
LG 32LN536U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 32LN536U TV does not turn on at all. The control lights do not light or flash. On the remote control and the buttons on the control panel does not respond.
With such manifestations, the EAX64905001 power supply module usually fails. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches (MDF11N65B) of the converters and rectifier diodes for a possible avalanche breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key may be PWM (PWM) SSC1S311A (PWM flyback), NR891D (PWM Step-down 24/12). It is checked only by replacement with a known good one.
- 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 most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. 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 check the LED line for breaks 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, as a rule, light up a single 3-volt 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 a health indicator. In faulty LEDs, the 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 EAX64891306 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). When repairing an MB board, you need to check its CPU components: LGE2121-MS, DRAM: H5TQ2G630FR, NAND Flash: SAA36254746F VER 03.13.72, SPI Flash: 25Q80, SOUND: STA3808WF. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If a TDSQ-G601D (B) tuner is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Owners and users of the LG 32LN536U 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!
SCHEMATIC MANUAL --------> LG 32LN54**, 32LN54**-Z*, 32LN536*, 32LN536*-Z* Chassis LD31B/LD36B.
PSU SCHEMATIC --------------> LG LGP32-13PL1, LGP32I-13PL1
To reduce the backlight current in TVs with the LGP32-13PL1 power supply unit (EAX64905001), you can increase the resistance of the current sensor, which consists of a set of pairs of low-impedance resistors R822-R829, only 4 pairs of 3.9 + 4.3 Ohm.
Having repaired one pair, we increase the nominal value of the sensor by 25%, which proportionally reduces the current in the LEDs from 400 mA to 300 mA.
More details on this page
The appearance of the MainBoard EAX64891306 is shown in the figure below:EAX64891306
EAX64891306 can be used in TVs:
LG 32LN540V (Panel LC320DUE (SF)(R1)), LG 42LN542V-ZD (Panel LC420DUE SFR3), LG 32LN541V (Panel LC320DUE (SF)(R1)), LG 42LA615V (Panel LC420DUE (SF)(U2) ), LG 32LA615V (Panel LC320DUE (SF)(U2)), LG 42LN540V (Panel LC420DUE (SF)(R1)), LG 42LN541V (Panel LC420DUE (SF)(R1)), LG 47LN540V (Panel LC470DUE (SF)(R1)), LG 32LB530U ZA (Panel LC320DXE (SG)(R1)), LG 39LN540V (Panel HC390DUN-VCFP1-11XX), LG 32LA643V (Panel LC320EUN (SF)(F1)), LG 32LN542V (Panel LC320DUE SF R1), LG 47LA615V (Panel LC470DUE (SF)(U2)), LG 47LA643V ZB (Panel LC470EUN (SF)(F2)), LG 32LN541U ZB (Panel HC320DXN-VHFP1 - 21XX / HC320DXN-VHFPA - 21XX), LG 32LN536U (Panel NC320DXN (SA)(P1)), LG 37LN541U (Panel LC370DXE (SF)(R1)).
The appearance of the power supply
Main features of the device LG 32LN536U:
Installed matrix (LED-panel) NC320DXN (SA) (P1).
The matrix control uses the Timing Controller (T-CON) 6870C-0370A.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the MAP3202 PWM controller. As power elements of the LED driver, keys of the type FDT86106, AP18N20GH are used.
The necessary supply voltages for all nodes of the LG 32LN536U TV are generated by the EAX64905001 power module or its analogs using SSC1S311A (PWM flyback), NR891D (PWM Step-down 24/12) microcircuits and MDF11N65B type power switches.
MainBoard - the main board (motherboard) is an EAX64891306 module using CPU chips: LGE2121-MS, DRAM: H5TQ2G630FR, NAND Flash: SAA36254746F VER 03.13.72, SPI Flash: 25Q80, SOUND: STA3808WF and others.
The TDSQ-G601D (B) tuner allows you to receive television programs and tune to channels.