Power supply repair help

[George]

Hello:

Trying to affect a repair in a video system device (TBC). The symtom
is seen as slight hue shifting on the monitor evident by several
horizontal bars of various widths. I can see some slight spiking on
the 5. DC rail more or less lining up with the bars in the video.

My assumption at this point is failing filter caps in the 35amp 5v.
switching supply power supply. The unit is around 20 years old and has
seen heavy use by the looks of the dust on the fan.

Question: Would I lean towards replacing only the three 200v 330uf
caps in the primary and/or the 12 or so 1000uf caps on the 5v. output
as well?

Thanks for the advice.

George

 

[Sofie]

George:
If you want some more specific advice you really must post the MAKE and
MODEL numbers..... such as Microtime T120, S230, etc, etc. Obviously not
all TBCs are designed with the same circuitry and parts.
As in most SMPS designs, the electrolytics in BOTH the primary and secondary
side are always suspect and if you do not have an ESR meter to check them,
substitution and replacement is the more time consuming alternative.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
-----------------------------------


"George" <megazoid@bigfoot.com> wrote in message
news:8d096043.0401040844.d0f23a9@posting.google.com...

Hello:

Trying to affect a repair in a video system device (TBC). The symtom
is seen as slight hue shifting on the monitor evident by several
horizontal bars of various widths. I can see some slight spiking on
the 5. DC rail more or less lining up with the bars in the video.

My assumption at this point is failing filter caps in the 35amp 5v.
switching supply power supply. The unit is around 20 years old and has
seen heavy use by the looks of the dust on the fan.

Question: Would I lean towards replacing only the three 200v 330uf
caps in the primary and/or the 12 or so 1000uf caps on the 5v. output
as well?

Thanks for the advice.

George

 

[Rosie Cenario]

On 4 Jan 2004 08:44:14 -0800, George hath writ:

Trying to affect a repair in a video system device (TBC).

No, you're trying to *effect* a repair.
Posting here may elicit replies that will *affect* the outcome.

 

[Richard Crowley]

George wrote:
Trying to affect a repair in a video system device (TBC).

"Rosie Cenario" wrote ...

No, you're trying to *effect* a repair.
Posting here may elicit replies that will *affect* the outcome.

Not according to Merriam-Webster.com

"to affect a repair" has been proper usage since the 15th
century. Perhaps it seems "wrong" to YOU because that
form is now archaic.

OTOH discussion of grammar belongs in another forum,
suggest news:alt.usage.english or news:alt.english.usage