Technical description and composition of the LG 32LB75 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LB75
Chassis / Version: LD73C
Panel: LC320WXN (SA) (A1) // LC320WXN (SA) (A2)
T-CON: LC320WXN-SAA1 P / N: 6870C-0195A
Inverter (backlight): LC320 6632L-0494A
PWM Inverter: BD9897FS
MOSFET Inverter: FDD8447L
Power Supply (PSU): YP32DVR EAY43596801
PWM Power: ICE3B1565J (Standby), 5501A, 4428YM, U3037M
MainBoard: EAX37632202 (0)
IC MainBoard: FLi8548H-LF, 24LC256, 29LV320CTTC-70G, HY825DC256160CE-5, CXA2069Q, MSP4450K E8, STi5100GUC
Tuner: TDFC-G107P
Control: MKJ32022835
Specifications 32LB75
LG 32LB75
General recommendations for repairing TV LCD
Repair of the LG 32LB75 TV should begin with a careful external examination of all its components and modules. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. Experienced repairmen are well aware of how ring cracks in soldered terminals look, swollen capacitors, and other causes of problems in electronic devices.
If the TV does not turn on, no control lights are on or blinking, there are no sounds when you turn on, and there is not the slightest sign of operability - the most likely malfunction is in the power module. 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 transistors, which are often found in such a state of 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 32LB75 TV does not have an image, but there is sound, the malfunction should be sure that the backlight power converter (inverter) is working properly. It is also necessary to check the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for excessive ESR. When diagnosing a malfunction of the inverter with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
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).
If the TV works normally from external devices, but does not tune into television channels, the TDFC-G107P tuner may malfunction. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. Sometimes the cause of the inoperability of the tuner may be a software failure.
It should be remembered! Attempts to repair the LG 32LB75 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATIC MANUAL -------------------------> LG 32LB75, 32LB76 Chassis LD73C
The appearance of the MainBoard EAX37632202 is shown in the figure below:EAX37632202
EAX37632202 can be used in TVs:
LG 26LB75-ZE (Panel V260B1-L03 Rev. C3), LG 32LB76-ZD (Panel LC320WX6 (SL)(A3)), LG 32LB75 (Panel LC320WXN (SA)(A1)).
The appearance of the power supply
Main features of the device LG 32LB75:
The matrix (LCD panel) LC320WXN (SA) (A1) or LC320WXN (SA) (A2) is installed.
The matrix control uses the Timing Controller (T-CON) LC320WXN-SAA1.
An LC320 inverter is used to power the backlight lamps, it is controlled by the BD9897FS PWM controller. As power elements of the inverter, keys of the FDD8447L type are used.
The necessary supply voltages for all nodes of the LG 32LB75 TV are generated by the YP32DVR power module, or its analogs using ICE3B1565J (Standby), 5501A, 4428YM, U3037M microcircuits.
MainBoard - the main board (motherboard) is an EAX37632202 module, using chips FLi8548H-LF, 24LC256, 29LV320CTTC-70G, HY825DC256160CE-5, CXA2069Q, MSP4450K E8, STi5100GUC and others.
The TDFC-G107P tuner provides TV reception and channel tuning.
Information from an alternative source:
LG 32LB75 Chassis LD73C
Panel Type (Matrix): LC320WXN (SA) (A1)
Motherboard: EAX37632202 (0), Tuner: TDFC-G107P
T-con: LC320WXN-SAA1 P / N: 6870C-0195A
Invertor: LC320 6632L-0494A, AV: EAX38263101 (1), IR: EAX35731602 (4)
PSU: YP32DVR P / N: EAY43596801
Remote control: MKJ32022835
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320WXN-SAA1
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 (Haze 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1100: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V