Having problems with your Cornerstone Computer Monitors ?

7540 Compaq Monitor : Dry solder joints in Horizontal.

\015 My Compaq Monitor 7540 failed to show on screen.\015\012I removed cover, and found three dry solder joints on the main board.\015\012I was able to repair the first time, and it operated OK.\015\012It has happened again, but this time after soldering four dry solder joints, it will not operate this time.\015\012Is there any chance of a circuit diagram of this model, as I would like to repair if possible.\015\012Possibly the H/output transistor or other may be the fault, but on mentioning it to the electronic retailer, they was not able to offer what the transistor was when I asked for a C 5929 to replace it. It may not be the answer, but I would like to give it a try, and also other components that I might suspect.\015\012Would be pleased if transistor equivelents are able to be idendified so repair may be able to be performed.\015\012Where I am situated at the Gold Coast in Australia, there does not seem to be the knowlegeablepersonel that I was familiar with in the Southern States, so am a bit handicapped.\015\012Thanking you, for I was quite happy with the Monitor when it was operating correctly, and am able to repair myself as I was an electronic technican a few years ago.\015\012Allan Lomer.\015

Answers :

The best solution was to throw it out, and purchase a new LCD model, of another brand, as I expect there would be more troubles in the future with the Compaq model, seeing that this is the second time that dry solder joints have appeared in the two years I have had the monitor.
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