[TechAssist] Fixed: Toshiba 32A42 Severe pincusihion post lighting... Schematic
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 18 Jun 2005 21:36:57 +0000
Tried the jungle as sugested no luck. (missing EW pulse)
finally traced the cause to D466 a 2.7v zener on the base of Q461 the driver
for the pin output. It was leaky-short about 168Ω in each direction.
For those of you who like synopsis:
Toshiba
32A42A
TAC0248
(use 32A32 TAC0245 schematic)
---Severe pincushion, shutsdown after 5 min or so (gets narrower before
shutdown)
L461, D444,Q404 (HOT) all quickly overheat
9v to colector of Q461 missing as well as the base voltages for Q461 & Q460A
missing
Q460A had colector volatage of 45v (schematic calls for 10V)
Jungle TA1310N did not fix (EW pulse still missing)
Flyback gave upto 99 rings on sencore
D466 tested at 168Ω (base of Q461 to ground) replacing fixed the set
Peter Oliver
Tucson Radio TV
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Toshiba 32A42 Severe pincusihion post lighting...
Schematic
Date: Wed, 08 Jun 2005 05:18:58 +0000
Appears that the EW pulse to the pin circuit(componets have volatage and
test ok) is missing which as was mentioned may very well be the jungle, not
sure if it is also causing the overheat shut down problem so could have the
jungle and the flyback ?... (or how much to trust the fly after an over
current conditon)
Peter Oliver
Tucson Radio TV
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Toshiba 32A42 Severe pincusihion post lighting...
Schematic
Date: Sun, 05 Jun 2005 16:20:11 +0000
Not sure yet will get back to it on monday. Still a multimode thought on
failure..... either the drive to the PIN out is bad, the diode and coil that
feed back from the HOT to the PIN circuit are overheating(Pin out is cold),
as is the HOT. Picture starts as a very deep but symetrical although narrow
Hour glass after about 4 or 5 min it goes to an even narrower band (no hour
glass) then gets slightly narrower then shuts down at which time the HOT and
mentioned componets are very hot (see earlier post). So either their is an
overload in the PIN circuit or there is a bad flyback and or Yoke. If the
Whole chassis was working That would be an easy test, but a few more tests
since getting the schematic printed and assymbled are in order, the owner
might contact you by phone on monday depending on finding
Peter Oliver
Tucson Radio TV
From: <agower@xxxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: Toshiba 32A42 Severe pincusihion post lighting...
Schematic?
Date: Sat, 4 Jun 2005 19:21:10 -0700
I have the TOSHIBA 32A42 CHASSIS WHAT PART DO YOU NEED ? the PICTURE TUBE
WAS BROKEN ON THIS ONE!
agower@xxxxxxxxxxxxx
Cordova TV
Adolph Gower
3415 Comet Court
Sacramento, Ca. 95827-2924
Phone: (916) 698-6565
Fax: (916) 363-8359
----- Original Message -----
From: "STERLING PASHER" <spasher@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: 2005Äê6ÔÂ4ÈÕ 13:39
Subject: [TechAssist] Re: Toshiba 32A42 Severe pincusihion post lighting...
Schematic?
> Peter: I uploaded 32A32 witch is the same as 32A42. It should be in the
> new
> uploads section
>
> Buck Pasher
> Buck's TV
> Gander Newfoundland
> Canada
> 709-256-7738 (Fax & Phone)
>
>
>
> ----- Original Message -----
> From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, June 04, 2005 12:42 AM
> Subject: [TechAssist] Toshiba 32A42 Severe pincusihion post lighting...
> Schematic?
>
>
>> Just picked up a Toshiba 32A42. Customer said failed after lighting
>> strike
>> (very rare this time of year had a freak storm, usually doesn't rain
>> until
>> mid July). Has extremly bad pin cushion.... pulled in about 6 inches
from
>> each side. Haven't gotten it open yet but a manual would be nice.
> Apparently
>> there was a set donated to tha archives TO-32A42 & To-32A32 Although
with
>> the various health problems and then then the accident that were
posted
>> last week (hopefully both with get better soon) getting it might be
more
>> difficult than is prudent. Any ideas, will be cracking into it in the
>> moring....
>>
>> Peter Oliver
>> Tucson Radio TV
>>
>>
>>
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