Technical description and composition of the LG 32LC2R-ZJ TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LC2R-ZJ
Chassis / Version: LP61C
Panel: V320B1-L04 Rev. C1 // T315XW01 V.5
Inverter (backlight): I320B1-16A I320B1-16A-C002E
Power Supply (PSU): 68709D0006B 060111 rev1.2
PWM Power: F9223L (PWM), FA5501A (PFC), STR-W6251
MOSFET Power: W20NM60 (PFC)
MainBoard: 68709M0348C
IC MainBoard: VST693G-FA-B3-000 1.71VT01, AD9381KSTZ, TEA6420D, TPA3100D2PHPR, MAD4868A
Control: IR: 68709S0932C (0)
Appearance
LG 32LC2R-ZJ
General recommendations for repairing TV LCD
It is recommended that you start troubleshooting diagnostics and repairing LGs with the LP61C chassis, as well as other electronic devices, with an external inspection of the external and internal elements. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. 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.
If the LG 32LC2R-ZJ does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the power module 060111 rev1.2 PCB 68709D0006B. In some cases, only the processor power regulator may be faulty. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If there is no image when you turn on the LG 32LC2R-ZJ, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit. It is necessary to take into account that in cases of inverter protection shutdown (in order to be able to diagnose) there is a risk of failure of the inverter power elements and take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
Remember! Attempts to self-repair by users of the LG 32LC2R-ZJ TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC MANUAL -----------------> LG 26LC2R-ZJ, 32LC2R-ZJ, 26LC2R, 32LC2R Chassis LP61A
The appearance of MainBoard 68709M0348C is shown in the figure below:68709M0348C
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the 68709D0006B module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the FA5501A PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 3
80V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device LG 32LC2R-ZJ:
Installed matrix (LCD panel) V320B1-L04 Rev. C1 or T315XW01 V.5.
To power the backlight used inverter I320B1-16A.
The necessary supply voltages for all nodes of the LG 32LC2R-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 68709M0348C, using microcircuits VST693G-FA-B3-000 1.71VT01, AD9381KSTZ, TEA6420D, TPA3100D2PHPR, MAD4868A and others.
Additional technical information about the panel:
Brand: CMO
Model: V320B1-L04
Type: a-Si TFT-LCD, Panel
Diagonal size: 32.0 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 708.954x398.592 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V