I received a phone call from a client who wanted his television checked by a technician.
The symptoms were, Television is powering on then
shutting down after 20 to 30 minutes.
When the television shut down, the audio remains
but no picture.
Since I could not figure out the real cause of this
symptom from the description given on phone, I requested him to bring the television
to the shop for further testing.
Within one hour he was at my shop credits to Google
map which does great job in directing customers to my shop.
Once on my work bench I decided not to test what
the customer said since I figured out taking a whole 20 minutes waiting for the
symptoms to present is waste of time.
I opened the television and after removing the
cover my eyes caught the attention of one capacitor which had its top silver
part slightly swollen as you can see below.
The capacitor was rated 33uF/200V
Looking at the capacitor you will see that it is located on the LED backlight drive circuit and this can cause the television to behave as the customer complaints were.
I decided to replace the capacitor with 33uF/400
Volts instead of 33uF/200 volts since the symptoms presented by this capacitor
was failure due to high voltage.
I replaced the capacitor and the television came
I tested it for two hours non stop and the issue
of shutting down never presented again and this lead me to conclude the television
has now been restored back to factory setting.