Question about Cornerstone Professional P1600 Monitor

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Cornerstone p1600 flickering / arcing

I have a Cornerstone p1600, several years old. Started making arcing sounds and the screen flickers. Was happening every few minutes, now it's every few seconds. I'm going to open it up, blow out the dust and inspect it. I expect the problem is either the power supply or the CRT. If it's the CRT then this monitor is a goner. Has anyone experienced this problem? Where can I get a service manual? This has been a fantastic monitor, would hate to throw it in the trash.

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Chuck,
Yes, dust accumulation will cause this and sometimes humidity.
You probably wont find much about arcing in a product manual.

The High voltage comes off the horizontal drive circuit through a transformer. Flickering says the CRT and the circuit is working. You just are getting a high voltage arc to a ground source before the CRT.

If you open this up, use extreme caution. You will be dealing with high voltage. Consider it a STUN-GUN! If you have a heart condition JUST SAY NO. Go shop for a new flat panel and recycle your old friend. I understand. I too am a hard sell if it can be fixed.

IF NOT THEN...
Place it in a dark room, turn it on and observe where the arcs are coming from and going to. TURN IT OFF. UNPLUG IT FROM POWER! (Most CRTs have an instant-on when plugged in)

Locate the suction-cup looking connector and wire on the back of the CRT. Use a vacuum first to remove as much dust and lint as possible.

The auto store sells ELECTRONIC CLEANER as well as SILICONE GREASE (for sparkplug wires). Do NOT use any thing that will leave a residue.

Clean the entire wire, connector and socket and any other area that you may have found in the dark test.
Use the silicone sparingly coat the contact area of the socket and wire.

IF there are other arc issues somewhere you may use silicone grease or silicone rubber to repair.

Good Hunting!

Posted on Jun 06, 2017

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Posted on Jan 02, 2017

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