[TechAssist] Re: LXI M#564.54710751 (Toshiba) mfg. 3/88, video driver prob.
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 09 Dec 2002 19:19:18 +0000
You mentioned Zeniths Shorted transistors but what about when there is a
open screen resistor or other bias resistor or bias transistor on the CRT
board that causes simmilar simptoms. Since some of your description is
charteistic of a CRT bias problem. Also That service switch can go bad,
rarely, but I've seen one or two over the years.
Peter Oliver
Tucson Radio TV
From: "teltek2" <teltek2@xxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: LXI M#564.54710751 (Toshiba) mfg. 3/88, video
driver prob.
Date: Mon, 9 Dec 2002 13:16:23 -0500
Daryl;
Just tell your customers...Sears doesn't have "same day service" either.
Maybe better at this time to give it back to him, and try Sears, then he
will find out.
-Ed-
Tel-Tek Electronics
Ontario-Canada
teltek2@xxxxxxxxxxxx
----- Original Message -----
From: "D Thunhurst" <dthunhurst@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, December 09, 2002 12:41 PM
Subject: [TechAssist] Re: LXI M#564.54710751 (Toshiba) mfg. 3/88, video
driver prob.
>
> I stand corrected.
> That's what happens when you ASS_U_ME instead of confirming. The set has
a
> Toshiba labeled crt and tuner along with several IC's. Also the customer
> told me it was a 35" but I think it is actually a 32" set.
> I have taken the advice of several and soldered the connectors to the crt
> board even if they looked alright but no help.
> I have made a bit of progress on this. I can get a picture with the rgb
> driver collectors running at 146 volts by adjusting what appears to be a
> brightness range control. However, with scene changes it flares out of
> brightness stability. I am leaning towards the ABL circuit. There also
is
> no changes in the picture when I vary the brightness or contrast but OSD
> indicates changes. It appears that possibly it is all controlled by the
> jungle chip.
> Without the literature, I am guessing. I would replace the chip but no
one
> locally has it and of course the customer is expecting to have his set
back
> today.
> Thanks,
> Daryl
> Daryl's TV
> 3310 Dyer St.
> El Paso, TX 79930
> 915-565-9184
> 915-564-1024 Fax
> http://dynacomp.freeyellow.com
> -----Original Message-----
> From: gulftech@xxxxxxxx <gulftech@xxxxxxxx>
> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> Date: Monday, December 09, 2002 9:00 AM
> Subject: [TechAssist] Re: LXI M#564.54710751 (Toshiba) mfg. 3/88, video
> driver prob.
>
>
> >
> >Daryl,
> >
> >564 is Sanyo/Fisher, not Toshiba. Resolder the wires from/to the crt
> >pcb. May look good, but resolder them anyway.
> >
> >
> >Ken Smith
> >Gulf Technical Services
> >3034 Gulf Breeze Parkway
> >Gulf Breeze, FL 32563
> >850-934-8324 (Voice) 850-932-0819 (Fax)
> >
> >
> >On Mon, 9 Dec 2002 07:36:04 -0700 "D Thunhurst" <dthunhurst@xxxxxxx>
> >writes:
> >>
> >> Hi,
> >> I have an old sears 35", 564.54710751 made by Toshiba.
> >> No chassis number found and I have not been able to cross to any
> >> Toshiba
> >> numbers. Sams is available only by photocopy.
> >> Set came in with intermittent vert. deflection. Found the usual bad
> >> solder
> >> joints throughout the chassis. Esr'd the electros and didn't find
> >> anything
> >> else bad. Traced my footsteps for possible solder bridges,
> >> connectors in
> >> the wrong place, etc. (none found).
> >> Problem now is I have full deflection but have washed out video. The
> >> picture looks like the usual symptom you get on the Zeniths that
> >> have the
> >> transistor shorted on the crt board.
> >> I'm not sure if it is a ABL problem or a video driver problem. I
> >> have 36
> >> volts on the RGB collectors but can bias the transistors to turn off
> >> and
> >> give me my 200 volts. However, when I turn up G2, I get a pulsing
> >> on the
> >> screen and momentarily get good video while it is pulsing ( pulses
> >> at rate
> >> of about one second). The RGB collectors then pulse from 36 to 145
> >> volts.
> >> If anyone has any ideas or has a cure or possibly run a scan of the
> >> video
> >> driver and ABL circuits.
> >> Thanks,
> >> Daryl
> >> Daryl's TV
> >> 3310 Dyer St.
> >> El Paso, TX 79930
> >> 915-565-9184
> >> 915-564-1024 Fax
> >> http://dynacomp.freeyellow.com
> >>
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