[TechAssist] LXI M#564.54710751 --- (Fixed)

  • From: "D Thunhurst" <dthunhurst@xxxxxxx>
  • To: "TechAssist" <TechAssist@xxxxxxxxxxxxx>
  • Date: Wed, 11 Dec 2002 15:11:36 -0700

Thanks to all that responded for the help.
The cure was IC301 jungle chip, LA7601W.
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: D Thunhurst <dthunhurst@xxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Monday, December 09, 2002 10:41 AM
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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>>
>>
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  • » [TechAssist] LXI M#564.54710751 --- (Fixed)