开云体育

Apologies for the delay in updating, was a bit under the weather.

Months ago I initially used a 5x mag lens to investigate the solder joints
in the PS areas. Didn't see any issues.

Last week when I got back to working on this, I remembered I had a cheap
$20 usb microscope laying around.

Discovered very tiny cracks on all 3 pads on both Q946 and Q947. C907 had
crack on the component side of the board (the bottom was not cracked)
hosted pics of cracks:

IPA scrubbed, dried, applied some amtech flux and reflowed the joints.

Also swapped out C956, I was using the original mallory cap due to
ordering the incorrect cap the first time. Used a new Nichicon UHW 330uF
50V that I had on hand. I seen that C956 is listed as +10-100% and believe
this is a workable low impedance choice. If not, i'd appreciate any insight
on the matter.

Powered up, the shrinking H and V issue
and extreme intensity change fail states no longer occurs. The only fault
that I notice is that the traces just barely pulse brightness (as if you
were just barely turning the intensity knob by 1-2 degrees back and forth)
after 3-5min, they remains steady for until powered down.

Going to microscope a bit more and use a long wooden dowel to gently tap
around while the unit is running as David Hess mentioned on my project
thread on eevblog.



P.S.: Just adding a link to the project thread on eevblog in case it helps
anyone in the future etc.