"Phil Allison" wrote in message
...

** I had hoped that the dreaded Yellow Glue peril had gone away - but it
is still with us.

Most of you will have seen it holding parts down to PCBs on Asian made
equipment and many of those will have seen what happens if the parts
involved get hot.

The example on my bench is the SMPS from an Alesis powered monitor ( M1
Active, Chinese made) ) which has blown up big time because of the damn
Yellow Glue used to secure a ferrite toroidal coil. All the glue used had
gone brown or back ( ie carbonised ) on this coil and arced across nearby
tracks taking out the main switching MOSFET, its drive IC and associated
transistors, high speed diodes and even the AC bridge rectifier diodes.

The toroidal coil had to be un-wound, cleaned up and re-wound. The same
glue was attacking parts elsewhere on the board too ( it corrodes copper)
and had to be laboriously scraped off.

Are the dickheads who squirt this horrible goop all over PCBs NEVER
going to wake up ??



..... Phil





I had an M1 with exactly the same problem. Conductive gak all over the
place, very messy, but fortunately didn't blow anything up.



Gareth.