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Tuesday, August 30, 2016
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.
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