A friend of mine called me to pass by his place to check on
his television, the complain was no picture but audio is okay.
I passed by his place and he was out of the house and I was
attended by the wife. There was no power in the area and after asking her a few
question about the nature of the problem she confirmed what the husband said.
I never carried with me any equipment because I was not
intending to do the repair on site.So I took the television with me back to my workshop, I
applied the power and to my surprise the screen was full.
So could there have happened a miracle on the road from the
owner place to my place?. I concluded that because the road from his house to my shop
was very rough, could be some dry joints on the circuit were affected
positively.
To confirm my theory
I decided to tap the TV body softly with my bare hands with power on, after
two-three taps the screen disappeared completely. With this I confirmed the machine had dry joints and
therefore the issue of spare parts is out of question (sorted)
Therefore this area is now most used to connect DVD player
and decoder and therefore loose contact can easily occur.So I turned the board the other side and did thorough
soldering on every pin irrespective if it looks okay and not.
Next suspect area was the RGB circuit at the neck of the CRT
tube
Also checked the whole board for any suspect areas including
the fly-back pins, chopper transformer pins, when I was happy with the work
done I decided to test the machine.
I therefore re-assembled the television and applied the
power and this is what I saw
To confirm if there were still more dry joints, I tapped the
TV body again and this time the picture had no problem.
Thank you guys
See you in the next class
hi Mndaka i am having a television with horizontal lines at the top of the picture
ReplyDeleteHi Allan, Check for a faulty capacitor around the vertical circuit.
DeleteRegards Humphrey
HI MR MANDEKA
ReplyDeleteyour article is useful like always and you solve the problem of this tv
inspector wise and that is why i want to call you 007 agent for solving all kind of crt tv s problems .... cheers ... beh
Thanks Beh, All the best
DeleteRegards Humphrey
sir
ReplyDeleteplease help my crt tv has no audio but pictures is fine