Re: WG6100 heat problem

From: Patrick Danis <patdanis_at_verizon.net>
Date: Tue Apr 03 2012 - 15:45:23 EDT

Thanks Bill. I will report back with my findings after I troubleshoot.
Wish I had stayed an EE major at school.

Pat

On 4/3/2012 12:23 PM, wboucher6@cogeco.ca wrote:
> Unfortunately, there are several things that could cause Q606 to be stuck turned on. I'll assume that Q606 is in fact
> good and not leaking like crazy. Be aware that it might operate/test okay when cool and go into thermal runaway once it
> warms up enough. In that case, you'd also get a picture for a while and I assume you are not.
>
> Faults that will cause your described condition:
> - an open diode at D600, D601, or D602
> - an open R611
> - an open Q603
> - a shorted Q601
> - opens at any of R602, R604, Q602, R605
>
>
>
> Bill Boucher
> http://www.biltronix.com
>
>
>
>> Been fixing 6100's for some time and this is the first time I have run
>> into this issue. I have a monitor that was brought to me with the
>> following problem. Q606 is getting extremely hot. So hot that the
>> transistor socket is turning black like burnt toast and the frame is
>> almost too hot to handle on the right hand side.
>>
>> Believe it or not, the transistor is still working. I have been through
>> the deflection board several times and found nothing. I did find both
>> power transistors bad so replaced those and the blown fuses and the
>> socket on Q606 and it still will not come up. I only spent a few
>> minutes on it as I had to leave town for business. I'm just curious
>> what would cause the transistor to get so blasted hot.
>>
>> I will be getting back to it on Saturday to troubleshoot some more.
>>
>> Pat
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Received on Tue Apr 3 15:45:47 2012

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