[TechAssist] Re: CTC167CN - Retrace Lines/Bleeding Picture
- From: "John at Main TV" <maintv2004@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 15 Dec 2004 13:12:13 -0700
And a Merry Christmas to you. There should be +194 volts, coming from pin 3
of IHVT, thru R4701 (10 ohm) and CR4702, and filtered by C4703 (47uf at
250v). C4703 could be your problem. Also replace C4502 which is the
vertical circuit along the front edge of the chassis. It is common for
causing no video but ussually causes a dark raster. The lumi buffer that
gives trouble is Q2901 (PNP # 143806 or NTE159) John.
John Mielke
Main TV
636 main St.
Longmont, Co
phone 303 776 6955
fax 303 776 0792
maintv2004@xxxxxxxxxxx
----- Original Message -----
From: "David" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, November 05, 2004 12:51 PM
Subject: [TechAssist] Re: CTC167CN - Retrace Lines/Bleeding Picture
> Follow-up:
>
> I replaced luminance buffer...no change in picture. Measured CRT drive
> transistor levels and they are low (130-140VDC), I thought I made good
> measurement the first time! There's only 150VDC feeding up from the
> flyback secondary. I'll check the diode and cap in this circuit next.
>
> David Lessard
> Alexandria, Ontario
> mr_fixit@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of David
> Sent: Friday, November 05, 2004 1:25 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] CTC167CN - Retrace Lines/Bleeding Picture
>
> Merry Christmas Techs,
> =20
> I have this CTC167CN that was given to me, I would like to fix it for my
> son=92s room if possible. Picture has retrace lines and is a bit on the
> bright side with bleeding to the right of images (like too much drive
> level). When I turn down the G2 (screen) there are dark patches. All the
> CRT drive transistors have normal voltage and signal levels. Is this the
> tube or something else? I think I read something at one time regarding
> the luminance buffer causing a similar symptom. Could anyone confirm
> this and which transistor is the luminance buffer?
> =20
> Thanks,
> =20
> David Lessard
> Alexandria, Ontario
> mr_fixit@xxxxxxxxxxxx
> =20
>
> ------------------------------------------------------------------------
> -----
> Lost Password:
> http://www.tech-assist.org and select "Login Problems?".
> Email Archives:
> //www.freelists.org/archives/techassist/
>
>
> --------------------------------------------------------------------------
---
> Lost Password:
> http://www.tech-assist.org and select "Login Problems?".
> Email Archives:
> //www.freelists.org/archives/techassist/
>
-----------------------------------------------------------------------------
Lost Password:
http://www.tech-assist.org and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/
Other related posts:
