Technical description and composition of the LG 32LN655V TV, type of panel and applicable modules. The composition of the modules.LG LED
Model: 32LN655V
Chassis / Version: LD33B
Panel: LC320EUB (PF) (M1)
LED backlight: 6922L-0074A, 6920L-0001C, 6916L1160A
LED driver (backlight): 6917L-0132A PPW-LE32TM-O (A)
PWM LED driver: BD9470EFV
MOSFET LED driver: SDB5150D
Power Supply (PSU): EAX64907901 (2.4)
PWM Power: FA5760N, NCP3170A, LM2903
MOSFET Power: TK12A60W
MainBoard: EAX64797003 (1.2) EBR76823172 SAA36403548 SAA36403810
IC MainBoard: CPU: LGE2122, NAND: SAA36403538 VER. 3.20.33 H5TQ4G63AFR x2 H5TQ2G63AFR NTP7513
Tuner: TSQ-G601D (B) EBL61240503
Control: AKB73715601, AKB73855501, IR: EBR76405601, WiFi: TWFM-B006D
Specifications 32LN655V
LG 32LN655V
General repair guidelines for TV LCD LED
If the EAX64907901 power supply module (2.4) fails, the external manifestations may be different, for example, the LG 32LN655V does not turn on at all and there is no indication of the control lights on the front panel. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and TK12A60W transistors in the primary circuit.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the LG 32LN655V does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the LC320EUB (PF) (M1) panel, or their power converter - LED driver. Sometimes, when turned on, the image appears and immediately disappears. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the backlight unit.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
Diagnosis and repair of the EAX64797003 (1.2) EBR76823172 SAA36403548 SAA36403810 motherboard usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
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: LGE2122, NAND: SAA36403538 VER. 3.20.33 H5TQ4G63AFR x2 H5TQ2G63AFR NTP7513. BGA chip malfunctions are usually easy to detect by warming up.
If the TV works normally from external devices, but does not tune into television channels, the TSQ-G601D (B) EBL61240503 tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
For owners of 32LN655V TVs, we recommend that you contact qualified professionals with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
To reduce the backlight current in LED drivers with the BD9470EFV controller (TSSOP-B28), the total resistance of the resistors from pin 8 (ISET) to the housing should be proportionally increased. The resistance Rset (in kilo-ohms) is selected from the ratio 3000 / Iled, where Iled is the maximum current in each of the six channels in milliamps.
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SCHEMATIC MANUAL -------------------------> LG Chassis LD33B; Model 32LN655V, 32LN655V-ZD
The appearance of the MainBoard EAX64797003 is shown in the figure below:EAX64797003
EAX64797003 can be used in TVs:
LG 42LA620V (Panel LC420DUE (SF)(U1)), LG 32LN570V (Panel LC320DUE (SF)(R1)), LG 50LA644V (Panel LC500EUN (SF)(F1)), LG 47LA660V (Panel LC470EUG (PF)(F1)), LG 47LA621V (Panel LC470DUE (SF)(U1)), LG 42LA644V (Panel LC420EUN (SF)(F2)), LG 39LA620V ZA (Panel T390HVJ01.0), LG 42LA621V ZD (Panel LC420DUE (SF)(U1)), LG 32LA621V ZD (Panel LC320DUE (SF)(U1)), LG 32LN655V (Panel LC320EUB (PF)(M1)), LG 42LA667V (Panel LC420EUH (PF)(P1) ), LG 47LN613V (Panel LC470DUE (SF)(R4)), LG 32LA667V ZB (Panel LC320EUB (PF)(P1)), LG 55LA660V ZA (Panel LC550EUH (PF)(P1)), LG 47LA620V ZA (Panel LC470DUE (SF)(U1)), LG 32LN613V ZB (Panel LC320DUE (SF)(R4)), LG 42LN655V ZB.BRUZLJU (Panel LC420EUH (PF)(M1)), LG 32LA644V ZA (Panel LC320EUN (SF)(F1)), LG 42LN613V (Panel LC420DUE (SF)(R4)), LG 47LA690V ZB (Panel LC47EUH (PF)(P1)), LG 47LA662V (Panel LC470EUG (PF)(F1)), LG 42LA645V 42LA645V-ZC.BRUYLJU (Panel LC420EUN (SF)(F3)), LG 32LA660V (Panel LC320EUB (PF)(P1)), LG 47LA644V 47LA644V-ZA (Panel LC470EUN (SF)(F2)), LG 50LA667S (Panel T500HVD02.1), LG 47LA691V (Panel LC470EUH (PF)(P1)), LG 32LA662V (Panel LC320EUB (PF)(P1)).
The appearance of the power supply
Main features of the device LG 32LN655V:
Installed matrix (LED-panel) LC320EUB (PF) (M1).
The LED driver 6917L-0132A is used to power the backlight LEDs, it is controlled by the BD9470EFV PWM controller. As power elements of the LED driver, keys of the SDB5150D type are used.
The necessary supply voltages for all nodes of the LG 32LN655V TV are generated by the EAX64907901 power module or its analogs using FA5760N, NCP3170A, LM2903 microchips and TK12A60W power switches.
MainBoard - the main board (motherboard) is an EAX64797003 module using CPU chips: LGE2122, NAND: SAA36403538 VER. 3.20.33 H5TQ4G63AFR x2 H5TQ2G63AFR NTP7513 and others.
The tuner TSQ-G601D (B) EBL61240503 provides the reception of television programs and tuned to channels.