Re: HP 1955 Monitor Repair Guide

"As others have mentioned, don't forget to resolder all the inverter transformer pins."

I resoldered them as advised, although all did appear fine under 15X magnification. Examined all joints on the board with the following conclusions:

1. Most reflow joints were good. It appears that a couple of parts had tombstoned and the rework on those was terrible, but probably electrically sound. Redid those for insurance.

2. All through hole parts were apparently done manually, by two different operaters....

Re: HP 1955 Monitor Repair Guide

Just a follow up. The monitor is fine now. Recapped for insurance, although there were no signs of cap failure. Root cause was cracked solder joint on ferrite core coil near center 2SC5707s. Took out both 2SC5707s.

Touched up all four similar joints. All were hard to get right, although only the cracked one was originally bad. Also found poor joints on AC connector.

Thanks again for those who posted this information. It shortened my path a lot.

Re: New Members - please post your introductions here

Howdy,

Found forum through Google search for information on my dead monitor. Have been replacing bad caps in various gear for years, most recently a Fisher 800C receiver. (Second time around, but it has been 30 years). Caps go bad fast here in sunny Arizona.

Re: HP 1955 Monitor Repair Guide

Thanks Krankshaft.

This info saved me a lot of time on a monitor with exactly the problems described.