RE: Re: Tech Electrohome G05 UPDATE

I've had this happen on my AD before, pretty much the same components you
mention burned.

The problems with my board occurred in several steps:

 - I started experiencing vector drawing problems, occasional blank, 1/2,
1/4 screen, etc.

 - Did a cap kit /w chassis transistors, forgot to check cold solder joints
(the first game I ever worked on).

 - Fired it up and it fired up. Visibly smoked several resistors, other
components bad as well such as diodes and transistors, including Q706 and
Q707. Also fried one or more new chassis transistors as well.

I ended up replacing most of the 700 circuit components (at all the
components I could readily find). I got the parts from Bob Roberts and had
some final assistance from Alex Yeckly. We were able to get the board
running again.

Lessons learned:

 - Resolder pin header joints.

 - Check/replace chassis and deflection transistors as a matter of
maintenance.

Good luck

> -----Original Message-----
> From: owner-vectorlist@synthcom.com
> [mailto:owner-vectorlist@synthcom.com]On Behalf Of Lunar Lander
> Sent: Wednesday, October 25, 2000 7:32 AM
> To: vectorlist@synthcom.com
> Subject: VECTOR: Re: Tech Electrohome G05 UPDATE
>
>
> did some testing and further visual inspection
> of the board last night and here is what i came
> up with. I dont know why i didnt see this damage
> before.
>
> R718 Burnt Bad, Reading out of Range
> R714 Burnt Bad, OPEN Reading
> R705 Burnt, Tested OK
> R710 Burnt, Tested OK
> R720 OPEN
>
> All legs were lifted and tested to come
> up with the above.
>
> Took some readings on the transisors
> mounted on the heat sinks and compared
> them to the working "Y" deflection side,
> tested in place, did not remove... will
> do so to confirm my finding that Q706
> may be bad.
>
> Also did the same with the rest of the
> resistors in place between the y and x
> sides... did not find any other problem
> childs.
>
> does any one have any speculation as to
> what change of events took place to cause
> the excess heat and failure of the above
> components......?? where is a good place
> to pick up alot of these components, does
> BOB ROBERTS, carry all of these items?
>
>
>
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Received on Wed Oct 25 11:47:33 2000