[TechAssist] Re: Zenith TV Z35X21D - Dead/Intermittent
- From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 8 Dec 2003 14:36:17 -0500
Emitter is ground on the QX3401, and yes the fly can cause ps failure but I
never have seen one bad without taking out the output transistor... I also
had a bad batch of generic regulators, now I use the Zenith replacements...
Bob,
Bobs TV Worcester, ma
woodman1@xxxxxxxx
Main 508-853-1482
Fax 508-853-1480
----- Original Message -----
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, December 08, 2003 2:21 PM
Subject: [TechAssist] Re: Zenith TV Z35X21D - Dead/Intermittent
> Dooh...forgot to note QX3401 transistor orientation, (I think the
> transistor front was facing the SMPS transformer, could anyone confirm
> this please. I did order a new STR53041, (just in case). BTW the HOT
> checked OK. Queston: Wouldn't a defective flyback cause the HOT to short
> before stressing out the power supply (and ruining those components
> mentioned)? Thanks.
>
> David Lessard
>
> Alexandria Electronics
> 50 Harrison Street
> Alexandria, Ontario
> K0C-1A0
>
> mr_fixit@xxxxxxxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Bob@Bobs tv
> Sent: Monday, December 08, 2003 2:09 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Zenith TV Z35X21D - Dead/Intermittent
>
> David,
> Replace the transistor and the IC together...note how transitor
> comes out as some of the boards are marked WRONG......Part #'s on my
> precious post..No voltages on print for the regulator. You may need
> these
> parts listed, Make sure the output transistor is not shorted.....You
> could
> also have a bad fly..
> RX3406 and 07 47/1W
> RX3403 15/3W
> RX3409 4.7 1/2W
> RX3408 22/1/2W
> D3406,07,09 103-344-02A
>
> Hope this helps
>
> Bob,
>
> Bobs TV Worcester, ma
>
> woodman1@xxxxxxxx
>
> Main 508-853-1482
> Fax 508-853-1480
> ----- Original Message -----
> From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, December 08, 2003 1:52 PM
> Subject: [TechAssist] Re: Zenith TV Z35X21D - Dead/Intermittent
>
>
> > I just got back from the customers home. CX3416 checked good, replaced
> > it anyway. Qx3401 shorted C-E, front popped off. RX3406 burnt (beyond
> > recognition). Not sure if ICX3431 is dead, main fuse is still intact.
> > Does anyone have a good one kicking around so that I may compare pin
> to
> > pin readings? Is it possible that ICX3431 is still functional? How
> could
> > I check this? Thanks in advance.
> >
> > David Lessard
> >
> > Alexandria Electronics
> > 50 Harrison Street
> > Alexandria, Ontario
> > K0C-1A0
> >
> > mr_fixit@xxxxxxxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Bob@Bobs tv
> > Sent: Monday, December 08, 2003 12:49 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Zenith TV Z35X21D - Dead/Intermittent
> >
> > David,
> > When you first check the set, with set off check for 130V at
> the
> > collector of horizontal output.. {I use tuner ground} if its there.
> The
> > 22uf
> > and 100uf in the power supply should take care of this.. If the 130V
> is
> > missing you have other problems. Listed below are most common faults
> > CX34123 22uf/63
> > CX3416 100/25>>>sub to at least 50V
> > RX3404 180K 1/2W
> > QX3401 121-3401
> > IXC3431 223-28
> > If you want me to send a JPEG of power supply let me know..
> > Bob,
> >
> > Bobs TV Worcester, ma
> >
> > woodman1@xxxxxxxx
> >
> > Main 508-853-1482
> > Fax 508-853-1480
> > ----- Original Message -----
> > From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, December 08, 2003 11:55 AM
> > Subject: [TechAssist] Zenith TV Z35X21D - Dead/Intermittent
> >
> >
> > > Gentlemen,
> > >
> > > I need to gather components before visiting this sick TV. Customer
> > > indicates TV was intermittent before finally failing altogether.
> When
> > > intermittent shutdown did occur, shutting off the TV for 30 minutes
> > > would allow it to fire back up. This sounds like a capacitor acting
> up
> > > but which one(s) and now that the TV is dead - dead, what else
> should
> > I
> > > bring on this job. God Bless America (North & South). Thanks in
> > advance.
> > >
> > > David Lessard
> > >
> > > Alexandria Electronics
> > > 50 Harrison Street
> > > Alexandria, Ontario
> > > K0C-1A0
> > >
> > > mr_fixit@xxxxxxxxxxxx
> > >
> > >
> > >
> >
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