Somehow 2 lcd's recently fell into my possession. Replaced bad caps (even ones that looked just a bit rounded on top), and voila!, 2 working lcd's!!
I took apart an old laptop...and found a SMD cap that had separated one leg from the board. I bought a electrolytic of the same value and spent a few hours in hell trying to tie into the spots on the board where the old SMD had been. I had to scrape off the green top to make a strip to solder the new cap. WHEW!!
The funny part is after I put it back together and it still didn't work, I decided to "bake" the MB in a toaster oven. I set the temp at around 375, set the MB in there and went to look for something on the web as I waited for the oven to heat up.
My wife calls out to me that the oven smells funny. I run over there and find a well done MB! I had my IR thermometer at hand to monitor the oven temp. It was well over 500. DAMN! the oven had warmed up much faster than I expected...
On the floor of the oven were various parts of the the MB that had exploded off the board (the electrolytic caps), other parts that had melted loose of the board and had slid off or had just shifted a few centimeters off their original position.
so the lessons I learned were:
1. check oven temp before you put in the MB for a reflow
2, when you fashion the aluminum foil "legs" for the MB, make sure the MB is dead flat when you put it in.
3. learn when to call it quits.
I took apart an old laptop...and found a SMD cap that had separated one leg from the board. I bought a electrolytic of the same value and spent a few hours in hell trying to tie into the spots on the board where the old SMD had been. I had to scrape off the green top to make a strip to solder the new cap. WHEW!!
The funny part is after I put it back together and it still didn't work, I decided to "bake" the MB in a toaster oven. I set the temp at around 375, set the MB in there and went to look for something on the web as I waited for the oven to heat up.
My wife calls out to me that the oven smells funny. I run over there and find a well done MB! I had my IR thermometer at hand to monitor the oven temp. It was well over 500. DAMN! the oven had warmed up much faster than I expected...
On the floor of the oven were various parts of the the MB that had exploded off the board (the electrolytic caps), other parts that had melted loose of the board and had slid off or had just shifted a few centimeters off their original position.
so the lessons I learned were:
1. check oven temp before you put in the MB for a reflow
2, when you fashion the aluminum foil "legs" for the MB, make sure the MB is dead flat when you put it in.
3. learn when to call it quits.
Comment