[TechAssist] Re: citizen model JCTV2704 chassis M3L523S
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 6 Aug 2004 01:05:51 -0500
Bob and Ed are such "filthy-minded" individuals that the term "raggy" puts
them in a "Beavis and Butthead" mode.....
(ie "heh heh, he said raggy...heh heh.")
BTW I'm trying to remember Bob's last name and place of origin, I'll get it
eventually.....;-)
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Alvin Rose" <ajroseca@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, August 05, 2004 6:25 PM
Subject: [TechAssist] Re: citizen model JCTV2704 chassis M3L523S
| Hi Edward
| I received this email from you in reference to the jctv2704 tv
| and I am not sure what it means..Can you explain..
| Regards
| Alvin
| Edward Gaidies wrote:
|
| >More then I wanted to know.;-)
| >Only Bob and I are allowed to talk dirty, as such.
| >Interesting..though.;-)
| >
| >-Ed-
| >On Aug 4, 2004, at 11:50 PM, Damon wrote:
| >
| >
| >
| >>Ooops, when you stated base waveform, I thought you meant base as in
| >>"baseline".....( I rarely check base waveforms), normally they look
| >>like a
| >>"raggy" square wave anyways.....
| >>
| >>However the collector waveform should be a smooth pulse, about 12uS
| >>wide,
| >>anywhere from 1000V to 1100V max on most TVs, probably 80% ride right
| >>around
| >>1050V.
| >>
| >>The caps can induce a raggy looking collector pulse or heat up a
| >>transistor
| >>pretty fast if it's nearly open.....partly open/low value can cause it
| >>to
| >>fail like yours is. That 12uS pulse width can point to the problem
| >>too......more than 12us generally indicates bad IHVT/leaky cap (lowered
| >>voltage too), less than 11uS would show opening caps.....so the 12uS
| >>check
| >>is another tool in our toolbox...
| >>
| >>Damon Brunger
| >>Telrad Electronic Services
| >>Ft Wayne, IN 46815
| >>----- Original Message -----
| >>From: "Alvin Rose" <ajroseca@xxxxxxxxxxxxxxx>
| >>To: <techassist@xxxxxxxxxxxxx>
| >>Sent: Wednesday, August 04, 2004 9:18 PM
| >>Subject: [TechAssist] Re: citizen model JCTV2704 chassis M3L523S
| >>
| >>
| >>| Hi Damon
| >>| I will check the capacitors in the collector circuit
| >>| and the divider ladder in the pincusion circuit..the waveform
| >>| I referred to was on the output transistor Base lead
| >>| would this effect the input to the base lead.
| >>| Alvin
| >>|
| >>| Damon wrote:
| >>|
| >>| >You have open or off-value high voltage caps on the collector, you
| >>may
| >>also
| >>| >find bad caps in the pincushion's "divider ladder" . The spikes and
| >>"square
| >>| >wave" effect are the indicators.
| >>| >
| >>| >Damon Brunger
| >>| >Telrad Electronic Services
| >>| >Ft Wayne, IN 46815
| >>| >----- Original Message -----
| >>| >From: "Alvin Rose" <ajroseca@xxxxxxxxxxxxxxx>
| >>| >To: <techassist@xxxxxxxxxxxxx>
| >>| >Sent: Monday, August 02, 2004 9:40 PM
| >>| >Subject: [TechAssist] citizen model JCTV2704 chassis M3L523S
| >>| >
| >>| >
| >>| >| Hi Guys
| >>| >| we have a citizen tv which is shorting the horrizontal output
| >>| >| transistor..Have replaced it twice..Set will run for half an hour
| >>| >| and then will short the transistor..Scoped the collector and
| >>there is
| >>no
| >>| >| saddle in the waveform but a small amount of ringing on the
| >>reference
| >>| >line.
| >>| >| The base waveform looks like a modified square wave with a number
| >>of
| >>| >| high spikes at the start and finish of the waveform..I replaced
| >>the 22
| >>mfd
| >>| >| electrolytic in the primary of the driver transformer with no
| >>improvement.
| >>| >| Driver transister tests ok..Had anyone had this problem with this
| >>model
| >>| >| Your help is appreciated
| >>| >| Alvin Rose
| >>| >| Radio & Tv Centre
| >>| >| Marystown, Nl
| >>| >|
| >>| >|
| >>| >|
| >>| >|
| >>|
| >>
| >>
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| >>|
| >>|
| >>|
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| >Tel-Tek Electronics
| >Ontario-Canada
| >
| >teltek3@xxxxxxxxxxxx
| >
| >
|
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