[TechAssist] Re: Toshiba TV model CE36G18

Dang, you're going to need a print and I don't have one but from your
description of what is happening there must be a problem with the x-ray
protection shutdown circuit which is a sample of the high voltage from the
flyback, normally from the filament winding, which is rectified and sent
back to the jungle IC and kills the horiz drive if it goes too high.
Whatever voltage there is after the rectifier is normally then dropped
across a zener and a resistor or two so the result at the x-ray input pin
should be darn near 0 volts, the zener could be bad or the IC could be bad.
This is assuming the B+ in not too high and I expect 127 volts is ok. Maybe
you can trace it out the hard way without a print.
Jim Myers
Telrad Electronic Services Co.
Fort Wayne, IN 46815
jr.myers@xxxxxxxxxxx
260-432-4486 Fax and Voice
Fax is always on
----- Original Message -----
From: "Tomlee" <t8872695@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, June 28, 2002 4:24 PM
Subject: [TechAssist] Re: Toshiba TV model CE36G18



More information.
Tv shuts down If HOT is active. If colector of HOT is removed microcontroler
will not turn relay off.If I reconect HOT colector and
 I jump the relay. The Hot is active and High voltage is on and It does not
show any high curent.
I wonder why shut down?  B+  is 127v  Is it low?
Dang
www.tvcrcomputers.com
----- Original Message -----
From: "Tomlee" <t8872695@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, June 28, 2002 11:21 AM
Subject: [TechAssist] Toshiba TV model CE36G18


>
> Hello techs.
> I am working with Toshiba 36" . Customer said some how The house get 210V
> line. Some equipments blow up.
> I will work more but he wants the TV service first.
> I open and see fuse line 120v blown, D899 MOV (surge
> protect) blown.Change the fuse and turn on the tv. The
> relay on then off. Remove collector of HOT. The relay will stay on if turn
> on tv . B+ is 126V .Is it low?.It has 18v
> and 126v at the at secondary of tranfomer power supply.
> The LED blinks at relay turn on and off.The LED stays lit
> If I remove HOT collector because relay keep contacted.
> I do not have print of this.May be I do not have horizontal
> drive ?TV miss voltage for jungle iC?
> Any IDEAs  is appriciated.
> Dang
> www.tvcrcomputers.com
>
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