Hi
I have an IBM p202 that has problems at some scan rates it has a pin
cousion problem, (sides bowed in) pin cusion correction has no effect
when the fault is present. also at most scan rates it has a horizontal
flickering lines. Both problems clear up if the moniter warms up.
Someimes it will jump between normal and bad pincusion rapidly as it
warms up. Here is what I have tried so far. I took it apart and found
a section of the D board that was heat sensitive. Heat it with hair
dryer it clears up almost instantly, blow cool air on it with hair
dryer it starts messing up almost as fast. I suspected bad elerolitic
caps replaced all of them in this area, still has same problems. This
board has SMT components on the bottom of board I didnt mess with them.
I didn't notice any bad solider joints. Poking and prodding the board
didn't seem to have an effect on the problems. Any suggestions besides
toss it to the curb or take it to a tech?

"Chance" wrote in message
oups.com...
Hi
I have an IBM p202 that has problems at some scan rates it has a pin
cousion problem, (sides bowed in) pin cusion correction has no effect
when the fault is present. also at most scan rates it has a horizontal
flickering lines. Both problems clear up if the moniter warms up.
Someimes it will jump between normal and bad pincusion rapidly as it
warms up. Here is what I have tried so far. I took it apart and found
a section of the D board that was heat sensitive. Heat it with hair
dryer it clears up almost instantly, blow cool air on it with hair
dryer it starts messing up almost as fast. I suspected bad elerolitic
caps replaced all of them in this area, still has same problems. This
board has SMT components on the bottom of board I didnt mess with them.
I didn't notice any bad solider joints. Poking and prodding the board
didn't seem to have an effect on the problems. Any suggestions besides
toss it to the curb or take it to a tech?


Switch the monitor off. Pick out a component on the faulty board and heat it
with the tip of a soldering iron. Switch monitor back on and see if fault
clears. Repeat until you find the bad component. You can use a can of freeze
spray alternately with the heat to confirm the bad part.

I'd certainly want to reflow all the solder joints with fresh solder though.
Electrolytic caps would be my first suspect, but as you've eliminated them
bad solder joints are a strong possibility.

Dave

Some components, especially capacitors have become thermo sensitive. The
fault is most likely in the pin amp and horiz scan areas.

We normally use a heat gun and freeze spray to troubleshoot for this type of
fault.

--

JANA
_____


"Chance" wrote in message
oups.com...
Hi
I have an IBM p202 that has problems at some scan rates it has a pin
cousion problem, (sides bowed in) pin cusion correction has no effect
when the fault is present. also at most scan rates it has a horizontal
flickering lines. Both problems clear up if the moniter warms up.
Someimes it will jump between normal and bad pincusion rapidly as it
warms up. Here is what I have tried so far. I took it apart and found
a section of the D board that was heat sensitive. Heat it with hair
dryer it clears up almost instantly, blow cool air on it with hair
dryer it starts messing up almost as fast. I suspected bad elerolitic
caps replaced all of them in this area, still has same problems. This
board has SMT components on the bottom of board I didnt mess with them.
I didn't notice any bad solider joints. Poking and prodding the board
didn't seem to have an effect on the problems. Any suggestions besides
toss it to the curb or take it to a tech?