Hi, I just want to share my success story it might be helpful for
some one else:
Problem:
I have a sony 35 inch KV45S42 TV, it is about 4 years old. It lost
the picture, still have sound. Some time picture will come on then
slide away upward. I read on the net that lots of people was haiving
this issue with Sony TV, and few solutions were offered. Here is
what worked for me.
Solution:
I took the main board out and resolder (reflow) all the
solder joints. Most of them were Ok but right under the flyback
transformer few of the solder joints looked suspicous. But anyway I
resolder the whole board, i.e I used the water based flux and put on
the solder joints then using the slodering iron to reheat all the
joints. That did, my TV is workin fine for last 3 weeks without any
problem.
I thing with heat /cold cycle (there is a lot of heat generated when
your TV is running)the joints become "cold solder joint" means they
look fine from outside but internally do not make good connection or
with high heat develop some hair line cracks. I have fixed few OBDC
for BMW and Mercedes the same way.
I hope it help some one, but make sure you know what you are doing.
Practice with soldering iron first. DISCHARGE THE PICTURE
TUBE /CAPACITOR. THERE IS 30k v CHARGED THERE EVEN WHEN YOU
DISCONNECT FROM THE POWER SUPPLY.
Good Luck.
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