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intermittent vertical scan collapse

 
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BBM



Joined: 05 Dec 2007
Posts: 1

PostPosted: Wed Dec 05, 2007 10:46 pm    Post subject: intermittent vertical scan collapse Reply with quote

Mitsubishi Diamond pro 930

Does anyone have a service manual for the tube, iirc it is the same one that was used in the 19" lacie electron.
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PostPosted: Wed Dec 05, 2007 11:14 pm    Post subject: Reply with quote

Resolder the vertical IC and the Diode that connects to it.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Dec 10, 2007 8:02 am    Post subject: Reply with quote

A common cause for vertical scan faults in monitors is bad solder joints on the scan coils PCB. In particular, if solder lugs are riveted to the PCB and the sharp edges of the rivet heads cut through the copper foil, there can be nasty intermittent contacts that are not so easy to see at first instance.

A definite sign of that the vertical scan coil has gone open circuit is if, when you check the voltage at each end of it with an oscilloscope, you find a square wave of about 30 V p-p at one end and zero at the other end.
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