[TechAssist] Re: LXI M#564.54710751 (Toshiba) mfg. 3/88, video driver prob.
- From: "D Thunhurst" <dthunhurst@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 9 Dec 2002 10:41:43 -0700
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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