How to Repair a Philco TV PH 21M SS
If you have a Philco TV PH 21M SS that is not working properly, you may be able to fix it yourself by following some simple steps. The Philco TV PH 21M SS is a 21-inch CRT television that was released in the early 2000s. It has a stereo sound system, a remote control, and various input and output ports. However, like any electronic device, it can also suffer from some common problems, such as no power, no sound, no picture, or distorted image. In this article, we will show you how to diagnose and repair some of these issues using the schematic diagram of the TV.
Download File: https://vittuv.com/2w3wpR
What You Need
Before you start, make sure you have the following tools and materials:
A multimeter to measure voltage and resistance.
A soldering iron and solder to fix loose or broken connections.
A screwdriver to open the TV case and remove the circuit boards.
A PDF reader to view the schematic diagram of the TV. You can download it from [here].
A safe and well-lit workspace to avoid electric shock and fire hazards.
How to Diagnose the Problem
The first step is to identify the source of the problem by checking the symptoms and testing the components. Here are some common problems and how to diagnose them:
How to Test
The TV does not turn on or respond to the remote control.
The power cord, the fuse, the switch, or the power supply board may be faulty.
Check if the power cord is plugged in and not damaged. Check if the fuse is blown or not. Check if the switch is working or not. Check if the power supply board is receiving and delivering the correct voltage.
The TV has no sound or low volume.
The speaker, the audio cable, the volume control, or the audio amplifier board may be faulty.
Check if the speaker is connected and not damaged. Check if the audio cable is plugged in and not damaged. Check if the volume control is working or not. Check if the audio amplifier board is receiving and delivering the correct voltage and signal.
The TV has no picture or a blank screen.
The video cable, the video input, the tuner, or the horizontal deflection board may be faulty.
Check if the video cable is plugged in and not damaged. Check if the video input is selected correctly. Check if the tuner is receiving and delivering the correct signal. Check if the horizontal deflection board is receiving and delivering the correct voltage and signal.
The TV has a distorted image, such as lines, colors, shapes, or size.
The vertical deflection board, the CRT tube, or the convergence board may be faulty.
Check if the vertical deflection board is receiving and delivering the correct voltage and signal. Check if the CRT tube is working properly and not damaged. Check if the convergence board is receiving and delivering the correct voltage and signal.
How to Repair the Problem
Once you have diagnosed the problem and identified the faulty component, you can proceed to repair it by following these steps:
Unplug the TV from the power outlet and wait for at least 15 minutes to let it discharge any residual electricity.
Open the TV case by removing the screws on the back panel. Be careful not to touch any exposed wires or metal parts inside.
Locate the faulty component on the circuit board using the schematic diagram as a reference. You can find the diagram on page 2 of the PDF file [here].
Use the multimeter to confirm that the component is defective by measuring its voltage or resistance and comparing it with the expected value on the diagram.
Use the soldering iron to desolder the component from the board. Be careful not to damage the board or other components nearby.
Replace the component with a new one of the same type and specifications. Use the soldering iron to solder it to the board. Make sure the solder joints are clean and secure.
Reassemble the TV case by putting back the screws on the back panel.
Plug the TV to the power outlet and test it to see if the problem is fixed. If not, repeat the steps until you find and repair the root cause.
Congratulations! You have successfully repaired your Philco TV PH 21M SS. Enjoy watching your favorite shows and movies on your restored TV.