Problem with an old Tandy CM-4 monitor

[Rik Bos]

Teo,

First check the solder joints for bad soldering like very good at all power
consuming components because due to temp./length variations the solders are
getting lose.
If the CRT isn't glowing you should also check the powersupply and the
hor.line-circuit.
Most time the switching transistor (you'll measure a shortcut between the
legs after you desoldered it) or a capacitor(elco) dies. 
And please be carefull not all old monitors have a discharge resistor placed
over the high-voltage elco's.

-Rik
 

> -----Oorspronkelijk bericht-----
> Van: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] Namens Teo Zenios
> Verzonden: maandag 18 mei 2009 12:02
> Aan: General Discussion: On-Topic and Off-Topic Posts
> Onderwerp: Problem with an old Tandy CM-4 monitor
> 
> A while ago I got a Tandy 1000 system with a CM-4 monitor. 
> The system worked fine for 20 minutes and then the monitor 
> died. So far I havn't seen anything that looks burnt on the 
> inside, but the tube doesn't light up when you provide power 
> and there is a crackling noise going on. Is there a common 
> issue with these old CGA monitors, and is this fixable 
> without gutting a working one?
> 
> 
> 
>