[TechAssist] Re: CTC169
- From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 27 Nov 2001 11:04:00 -0500
Clint, the question was more of a generic one with regard to all of the
nichicon high temp caps in the set and their probability of leakage. The
caps that you list include other types which do not typically fail by
leaking electrolyte.
In these two sets I believe it was C4143 that caused most of the damage.
One of them also had a leaky C4503. I have seen the latter fail along with
SCR501 but that was not the case this time. It was just leaking electrolyte
and eating up the connections on the board.
Leon.
Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: "OrpheusComputing.com Repair" <techassist@xxxxxxxxxxxxxxxxxxxx>
To: "TechAssist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 27, 2001 10:24 AM
Subject: [TechAssist] Re: CTC169
>
> It would help if you mentioned what caps you replaced & the
> symptoms that prompted it. Usually in this chassis the most
> common caps that fail are C4402, C4401, C4108, C4105, C4115,
> C4145, C414, C4503, C4141, C3124..all for 'dead' and
> 'shutsdown' problems.
> -Clint
>
> God Bless Us All
> Clint Hamilton, Owner
> http://OrpheusComputing.com
> http://ComputerHardware-ConsumerElectronics.com
> sales@xxxxxxxxxxxxxxxxxxxx
> Fax: 209-882-9602
> TechAssist Administration
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> (PLEASE include our previous correspondence
> if replying to this email!!)
>
>
> ----- Original Message -----
> From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, November 27, 2001 9:09 AM
> Subject: [TechAssist] CTC169
>
>
>
> I am wondering if you all have seen many leaky caps in these
> sets. I just
> did two this week that had leaky Nichicon 105 degree caps.
> The electrolyte
> caused enough corrosion to damage a couple of traces. These
> are the first I
> have seen like this and am wondering if we can expect this to
> be as common
> as in the Hitachi and Misubishi projection sets. How far do
> you guys go in
> looking for other caps going bad on these sets. I have found
> that sometimes
> the only way that you can find them is to heat the pins and
> see if they
> smell or remove them and visually inspect them. Many of the
> ones that are
> starting to leak check OK on all four tests, capacitance,
> ESR, DA, & leakage
> current. Should we be checking all of them on these sets?
>
> Leon.
>
> Leonard G. Caillouet
> Service Manager
> Electronics World
> Gainesville, FL
> 352-332-5608
> 352-332-5668 (fax)
>
>
>
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