Thanks for the reply, there is only a few resistors and diodes, I'll 
just replace all of them. I think the markings are OK to determine 
values. Probably the transformer voltages can be measured and educated 
guess what to replace it with if need be. Probably I can check the 
resistance of the transformer windings. I'm pretty sure it's center 
tapped, then the resistance of both sides should be close. :)

Bob Blick wrote:
> On Mon, 09 Nov 2009 12:17:17 -0500, "Carl Denk" <cdenk@windstream.net>
> said:
>   
>> Wife's kitchen oven has a .5" high 4 character plus colon, 7 segment 
>> clock/timer display. The timer only beeps when time expires, there is no 
>> control of the oven. Several of the LED segments are dim, and it they 
>> are not consistent in brightness with time.
>>     
>
> The clock chips I am familiar with use the internal resistance of the
> segment drivers as the current limit. And they have only two commons,
> steered by the 60 cycle AC. There are usually failsafe resistors on
> those two commons as well as the steering diodes. Based upon your
> symptoms(different segments dim at various times) those diodes and
> resistors are the components I would focus on. A slim possibility is one
> leg of the center-tapped transformer has gotten funky.
>
> Cheers,
>
> Bob
>
>   
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