Tuesday, August 30, 2016

How to solve picture upside after installing universal CRT tv kit.

My first time to change universal TV kit I was invited by a gentleman who was an electrician and wanted to change his father’s Television motherboard with the universal kit.


Monday, August 15, 2016

Understanding related components in a circuit

When you open electronics equipment like the television for the first time, one can easily get intimidated by the number of components in there.


This shouldn’t be the case if you have adequate knowledge in basic electronics especially on basic functions of the components and how to read circuit diagram.

Actually in my case if I have a problem with electronics equipment I never rush to open it first, and especially if there is something on the screen.

First I analyze the symptom systematically till I am very sure which circuit block is causing such a symptom.

Wednesday, August 10, 2016

Understanding and troubleshooting CRT Television Audio circuit

Some times on your line of repair you will encounter a case where a television is brought in for repair with NO audio PICTURE OK symptoms.

Please note that I mean the picture is present and very clear but there is no sound from the speaker. If it is no audio and no picture this is a different case and should be handed on another topic

Below you can see an audio circuit of a television using ic LA4266. Things to look for here include.

Understanding and troubleshooting CRT Television Audio circuit

Some times on your line of repair you will encounter a case where a television is brought in for repair with NO audio PICTURE OK symptoms.

Please note that I mean the picture is present and very clear but there is no sound from the speaker. If it is no audio and no picture this is a different case and should be handed on another topic

Below you can see an audio circuit of a television using ic LA4266. Things to look for here include.

Tuesday, August 2, 2016

Aucma CRT television screen blank but power ON led lighted.


I received an Aucma television assembled here in Kenya in my shop for repair, the screen was blank and therefore I decide to open it for further investigating.

The power ON light was green and therefore I expected the power supply was okay and therefore after opening the set I went straight to the RGB circuit.

Just before I was about to pull my meter to do some voltage testing on this circuit I noticed that the heater light was ON.

Once I saw the heater bulb was ON I kept aside the meter and proceeded to the fly back transformer looking for the screen POT.