[TechAssist] Re: LXI M#564.54710751 (Toshiba) mfg. 3/88, video driver prob.
- From: gulftech@xxxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 9 Dec 2002 09:51:09 -0800
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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