Technical description and composition of the LG 32LA667V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LA667V ZB
Chassis / Version: LD33B
Panel: LC320EUB (PF) (P1)
LED backlight: 6922L-0074A, 6920L-0001C, 6916L1160A
LED driver (backlight): PPW-LE32TM-O (A) Rev 0.5
Power Supply (PSU): EAX64907901 LGP32-13P PSEC-L221R
PWM Power: FA5760N, NCP3170A, LM2903
MOSFET Power: TK12A60W
MainBoard: EAX64797003 - EBR76823172
IC MainBoard: CPU: LGE2122, NAND: SAA36403538 VER. 3.20.33, H5TQ4G63AFR x 2, H5TQ2G63AFR, NTP7513
Tuner: TDSQ-G601D (B) EBL61240503
Control: 130528, IR: EBR76405601
Specifications 32LA667V
LG 32LA667V
General repair guidelines for TV LCD LED
A malfunction of the power supply is often manifested corny - the TV does not turn on, does not make any sounds, does not light up and does not blink with any indicators. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should begin 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 TK12A60W for the possibility of an avalanche or thermal breakdown.
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 32LA667V 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) (P1) panel, or their power converter is an 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.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the health of the transitions of the LEDs, as well as the reliability of the contact connections in the lines and connectors.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
The motherboard EAX64797003 - EBR76823172 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CPU: LGE2122, NAND: SAA36403538 VER. 3.20.33, H5TQ4G63AFR x 2, H5TQ2G63AFR, NTP7513 for new or obviously working. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before replacing the TDSQ-G601D (B) EBL61240503 tuner, if there is no tuning for the channels, first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention to users! Self-repair of the LG 32LA667V TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual and schematic diagram---------------------> LG CHASSIS LD33B; Model: 32LA660S 32LA660V 32LA662V 32LA667S 32LA667V 32LA6678
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 32LA667V:
Installed matrix (LED-panel) LC320EUB (PF) (P1).
The LED driver PPW-LE32TM-O is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the LG 32LA667V TV are generated by the EAX64907901 power supply 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 x 2, H5TQ2G63AFR, NTP7513 and others.
Tuner TDSQ-G601D (B) EBL61240503 provides the reception of television programs and tuning to channels.