The most important thing with electronics is sufficient cooling. You don´t need to follow this article and flip your PSU, but look into adding one or more fans to take out the hot air from the smaller compartment.

Notify of

Inline Feedbacks
View all comments
Jim Rohrer

Excellent site! Thank you for sharing you expertise. Back in my tv repair days we would identify a high voltage leak by a distinctive high pitch squeak. I notice similar sound in area of psu after a half minute of use and a 15% drop in current seems to support the leak theory but no visible arc or ozone. Any guidance on possible cause, locating and addressing? In the meantime, I plan to tilt my psu and reverse the fan to optimize breathing. hopefully cooling will help. Currently have a bench meter measuring current. Otherwise machine is still the digital version with no meter.

Jim Rohrer

You were right. The HV leak is inside the tube. I can see it arc sideways. Was using RO water but had not changed in a while. Cleaned and flushed and seeing much improvement. I’m now working through your cooling info. Thanks so much! PSU is tilted and permanent ammeter installed. 5 bad crimps found so thanks for that heads up.

Bill Lynch

Machine stopped working while setting up, was hesitating while jogging to position. Everything is dead no lights , ventilation , or digital read outs. Looked at fuse ,appears to be good, no visible burns on board . Machine has a jg-40w power supply ,rectifier bridge is a GBU 610. What should I look at next?


Thanks for the detailed website! There is a lot of valuable information here. I have a question about tilting the power supply 90Deg.

You said “Tilt the PSU 90 degrees, so the fan in the PSU grabs air from the ambient temp in your room, instead of breathing the heated air inside the machine.”

I have slots on the side of the machine where ambient temp air could be pulled into the housing that contains the PSU, but the fan on my power supply blows out away from the PSU not blowing INTO the PSU. Is this still correct? Because It would still grab warm air from inside the compartment and exhaust it out the slots on the side of my machine.

Or should I flip the fan around so it would draw air in from the slots, and blow it across the PCB of the Power Supply?