Technical description and composition of the LG 32LE2R-ZJ TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LE2R-ZJ
Chassis / Version: LP61A
Panel: LC320W01 - SL01
Inverter (backlight): LC320W01 REV-0.3 M, S 6632L-0207B, 6632L-0208B
PWM Inverter: MSC1691AI, A358F, A394F, AO9934GM, KIA339F
MOSFET Inverter: FDS8958A
Power Supply (PSU): 68709D0006B
PWM Power: F9223L (PWM), FA5501A (PFC), STR-W6251
MOSFET Power: W20NM60 (PFC)
MainBoard: 68709M0348F
IC MainBoard: VST693G-FA-B3-000 1.71VT01, AD9381KSTZ, TEA6420D, TPA3100D2PHPR, MAD4868A
Control: MKG32022805
Appearance
LG 32LE2R-ZJ
General recommendations for repairing TV LCD
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should inspect all the internal elements of the LP61A chassis, as well as the external chassis. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of the defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
In cases where the LG 32LE2R-ZJ TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the power supply module 68709D0006B is most likely faulty or missing processor power on the motherboard (a typical defect of some LG TVs). It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and RF7807 transistors, which are often found in such a state of breakdown in such situations.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the IRV3037CS PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
In cases where the LG 32LE2R-ZJ TV has lost its image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power. When disabling the inverter protection (to enable diagnostics), special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Diagnostics and repair of the 68709M0348F motherboard is carried out by checking the operability of the stabilizers or 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 elements VST693G-FA-B3-000 1.71VT01, AD9381KSTZ, TEA6420D, TPA3100D2PHPR, MAD4868A. BGA chip malfunctions are usually easy to detect by warming up.
Owners of 32LE2R-ZJ TVs are recommended to contact qualified specialists with experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC MANUAL -----------------------------> LG 32LE2R-ZJ Chassis LP61A
The appearance of MainBoard 68709M0348F is shown in the figure below:68709M0348F
68709M0348F can be used in TVs:
LG 32LE2R-ZJ (Panel LC320W01 - SL01), LG 32LC2RB (Panel V320B1-L04 REV.C1).
PSU Advanced
The 32LE2R-ZJ model uses the 68709D0006B power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the FA5501A PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the device LG 32LE2R-ZJ:
Installed matrix (LCD panel) LC320W01 - SL01.
An LC320W01 inverter is used to power the backlight, it is controlled by a PWM controller MSC1691AI, A358F, A394F, AO9934GM, KIA339F. As power elements of the inverter, keys of the FDS8958A type are used.
The necessary supply voltages for all nodes of the LG 32LE2R-ZJ TV are generated by the power supply module 68709D0006B, or its analogs using microcircuits F9223L (PWM), FA5501A (PFC), STR-W6251 and power switches of the type W20NM60 (PFC).
MainBoard - the main board (motherboard) is a module 68709M0348F, using chips VST693G-FA-B3-000 1.71VT01, AD9381KSTZ, TEA6420D, TPA3100D2PHPR, MAD4868A and others.
Information from an alternative source:
LG 32LE2R-ZJ Chassis LP61A
Panel Type (Matrix): - LC32W01 - SL018
Motherboard: - 68709M0348F, IC601 - VST693G-FA-B3-000 1.71VT01, IC401 - AD9381KSTZ, IC800 - TEA6420D, IC801 - TPA3100D2PHPR, IC802 - MAD4868A, Master: - LC320W01 REV-0.3, Q8, Q6, Q6, Q6, Q6 Q12, Q13 - FDS8958A, U1 - MSC1691AI, U3 - A358F, U4 - A394F, U6 - AO9934GM, U8 - KIA339F, Slave: - LC320W01 REV-0.3, Q206, Q207, Q208, Q211, Q212, Q213 - FDS A393F, U206 - AO9934GM
PSU: - 68709D0006B, U204 - IRV3037CS, Q209, Q210 - IRF7807,
Remote control: MKG32022805 Schematic
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320W01-SL01
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 73%
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V