How to Repair the Power Supply of LG 32LD350 LCD TV
If you have a LG 32LD350 LCD TV that does not turn on or has other problems, you may need to repair the power supply board. The power supply board is responsible for converting the AC input voltage into various DC voltages for the TV's circuits. The power supply board is located on the right side of the TV when viewed from the back.
In this article, we will show you how to troubleshoot and repair the power supply board of LG 32LD350 LCD TV. We will also provide you with the schematic diagram of the power supply board and some tips on how to prevent future failures.
Step 1: Check the Fuse and the Main Switching IC
The first thing you need to do is to check the fuse and the main switching IC on the power supply board. The fuse is labeled as F501 and it is a 4A 250V ceramic fuse. The main switching IC is labeled as IC501 and it is a STRW6053N IC. You can use a multimeter to test these components.
To test the fuse, set your multimeter to continuity mode and place the probes on both ends of the fuse. If you hear a beep or see a low resistance reading, the fuse is good. If not, the fuse is blown and you need to replace it with a new one.
To test the main switching IC, set your multimeter to diode mode and place the positive probe on pin 1 of IC501 and the negative probe on pin 2, 3, 4, or 5. You should see a reading of around 0.6V. Then, reverse the probes and place the positive probe on pin 2, 3, 4, or 5 and the negative probe on pin 1. You should see a reading of around 0.9V. If you see any other readings or no readings at all, the main switching IC is bad and you need to replace it with a new one.
Step 2: Check the Output Voltages and Other Components
After checking the fuse and the main switching IC, you need to check the output voltages and other components on the power supply board. The output voltages are labeled as +5V_STBY, +12V, +24V, +32V, -12V, -24V, and -32V. You can use a multimeter to measure these voltages.
To measure the output voltages, set your multimeter to DC voltage mode and place the black probe on any ground point on the board. Then, place the red probe on each output voltage point and note down the readings. The output voltages should be within Â5% of their nominal values. If any of them are missing or out of range, you need to check for shorted or open components on that output line.
Some of the common components that can cause problems on the output lines are diodes, capacitors, resistors, transistors, transformers, and optocouplers. You can use your multimeter to test these components in diode mode or resistance mode. If you find any shorted or open components, you need to replace them with new ones.
Step 3: Reassemble and Test
After repairing the power supply board, you need to reassemble and test your TV. Make sure you reconnect all the cables and screws correctly. Then, plug in your TV and turn it on. If everything works fine, congratulations! You have successfully repaired your TV's power supply board.
If your TV still does not work or has other problems, you may need to check other boards or components in your TV. You can refer to the service manual of LG 32LD350 LCD TV for more information[^1^]. You can also contact LG customer service for further assistance.
Tips on How to Prevent Power Supply Failures
Power supply failures are one of the most common problems in LCD TVs. They can be caused by various factors such as power surges, lightning strikes, overheating, dust accumulation, aging components, etc. Here are some tips on how to prevent power supply failures in your TV:
Use a surge protector or a UPS (uninterruptible power supply ec8f644aee