Compaq Plus monitor problems

[buddy1284]

I got a Compaq Plus luggable last week knowing it had display problems. I started my diagnostics by taking out all the non-compaq adapter cards and the monitor started to work fine. Then (I could kick myself) I tried adding the adapters back in one at a time to find the bad one. When I hit the bad one the monitor no longer works and removing the bad adapter does no good anymore. So I have a real repair job to handle now. I have tried cleaning and reseating all the monitor related connectors to no avail. One thing I noticed is that I don't see any heater glow comming from the crt. I even turned out the lights at night to try and see it. There is only a small section of the crt's glass tube showing near the tube connector. Can I take the absence of heater glow to mean that either the crt is bad or I don't have power to it? I have been unable to definitifly rule out power problems as none of the connectors give any indication of what volts on what pins. Any help would be appreciated. Buddy

 

[MikeS]

I got a Compaq Plus luggable last week knowing it had display problems. I started my diagnostics by taking out all the non-compaq adapter cards and the monitor started to work fine. Then (I could kick myself) I tried adding the adapters back in one at a time to find the bad one. When I hit the bad one the monitor no longer works and removing the bad adapter does no good anymore. So I have a real repair job to handle now. I have tried cleaning and reseating all the monitor related connectors to no avail. One thing I noticed is that I don't see any heater glow comming from the crt. I even turned out the lights at night to try and see it. There is only a small section of the crt's glass tube showing near the tube connector. Can I take the absence of heater glow to mean that either the crt is bad or I don't have power to it? I have been unable to definitifly rule out power problems as none of the connectors give any indication of what volts on what pins. Any help would be appreciated. Buddy

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CRT filaments are almost always the pins on either side of the locating key or gap, usually 6.3VAC. Be careful, there may be some fairly high voltages on the CRT base connector.

Good luck!

m