[TechAssist] Re: [Update 9-16-02] T/A Sony PTV KP53S25 Fluid leakage - [Repair or replace "E" board]
- From: "Damon" <DAMON101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 16 Sep 2002 07:37:36 -0500
Man I musta had schematics on this troubleshooting expedition! I certainly
didn't have that come off the top of my head.
Concerning the convergence, the most obvious thing to occur is the centering
magnets DO MOVE on the Crts. The mechanical focus is not very likely to
change, but I don't know if you kept the Crts in it's frame assy or not.
I'll assume you did.
I think the first thing to do is to electrically recenter the convergence
crosshairs on all 2 Crts, then using string from the corners, form an X on
the screen to find center. If you have a crosshair generator use that mode
to center all 3 CRTS. Once you've got the red/blue customer controls
centered, use the centering magnets to recenter the crosshair signal on all
3.
Make note that the Blue CRT must be slightly DEFOCUSED to create a NON
Harsh-edged picture, and the White balance will look yellowish if it's too
focused or too tight. I generally will use cross hair or preferably the
white section of the EIA color bar to balance the focus (electrically that
is...)
Since you did remove the lens to replace the Crt,. it is possible that it
was mounted wrong, but i doubt that. They fit or they don't. It is possible
the lens adjust may be off, once again doubtful, but as a last resort, if
it's too fuzzy with the electrical focus, readjust the mechanical
focus.(You'll have to adjust size and linearity any time you adjust mech
focus).
I think the KEY POINT is the fact that the centering rings are the most
likely reason you can't match up the RGB crosshairs, and I'd center my
attention on that First and Foremost.
Good luck
Damon Brunger
damon101@xxxxxxxxxxxxxx
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "LeRoy Westlund" <llw@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, September 16, 2002 12:25 AM
Subject: [TechAssist] Re: [Update 9-16-02] T/A Sony PTV KP53S25 Fluid
leakage - [Repair or replace "E" board]
>
> Damon,
> Your MY Sony man from now on !
> The Mos-Fet transistor Q808 was indeed causing the high voltage "E" board
to
> shut down. I replaced Q808, and Q806 (again), and the set came on in a IK
> shut down mode, with a Horz line at the bottom of all 3 CRTs.
> I tweeked the screen adjust for my NEW Blue CRT (That I just
> replaced),....and everything started working.
> I was deflecting my picture off the ceiling, so I couldn't tell how far
off
> my Blue adjustments might be. So,...I took the set back to the
> home,....reinstalled the CRT Array, and the chassis,..and proceeded to
fine
> tune the blue convergence, etc.
> >From the customer convergence menu,...the Blue bar seems to have plenty
of
> adjustment range (about 2 inches), but will not go far enough in the down
> direction to converge onto the green horz bar, to obtain proper
convergence.
> Also,...the blue is out of focus too far.
> I adjusted the focus lens on the blue CRT, and improved it a little, but
not
> satisfactory.
> I tried adjusting the convergence rings on the Blue CRT,...and connot
> improve the blue convergence to satisfactory level.
> At this point, I told the customer, I better have the set in the shop,
where
> I can take my time, to adjust the Blue Focus, and convergence. He
> agreed,...and now the set is here in the shop.
> Looking down into the Blue CRT directly, I can see a bright half moon on
the
> vertical edge (about an inche long). I am thinking that I either have a
> defective replacement CRT, or a cracked lens.
> But,...on the other hand,...is it possible that I just have the
adjustments
> too far out of range ? I tried to mark, and place the convergence magnets,
> and the focus lens, and the yoke, so I would have a very minimal fine
> tunning to do. I can't imagine it could be that far off.
> Any directions for centering the blue, onto the green cross bars, would be
> very helpful at this point.
>
> Still struggling with this one,..
> Thanks again to Damon,...and also to all others who have followed this
> repair thread, and have tried to help me.
> LLW
>
> LeRoy Westlund
> Westlund TV & Electronics " It's such a pretty world
> 93 North Main today !....
> Centerfield, UT 84622-0087 Look at the Sunshine. "
> Ph./Fax 435-528-3822 :-)
> mailto:LLW@xxxxxxxxxx
>
> -----Original Message-----
> From: Damon <DAMON101@xxxxxxxxxxxxxx>
> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> Date: Monday, August 26, 2002 7:28 AM
> Subject: [TechAssist] Re: Update: T/A Sony PTV KP53S25 Fluid leakage -
> [Repair or replace "E" board]
>
>
> >
> >You probably blew Q806 because you disconnected the HV block, there's
> >feedback on conn 904 pin 3 to Ic903. I suspect that the Mosfet I
mentioned
> >in a 2nd post may be causing the decaying voltage because it regulates
the
> >Q806 output via the emitter of Q806. No feedback and ....Q806 gets all
the
> >voltage! The Mosfet is nothing more than a variable resistor so it
> >limits/adjusts current flow thru Q806.
> >
> > The drive signal for this circuit comes from Conn 351 pin 1 and loops
thru
> >Cn 884 pin 5 to 6. You should have this on at all times, possibly during
> >shutdown too. It's obvious your feedback line from HV Block works since
it
> >blew Q806 when it was disconnected. Mosfet is an N-channel insulated gate
> (I
> >think, arrow points IN, part is IRF1640LF). I guess I learned something
> too,
> >don't disconnect HV Block in RA1 chassis. IT's Highly important that you
> >have + and - 15 at Cn 881 pin 3 and 5 and +/- 12V out of IC 905 / 906,
> make
> >sure those are present or shutdown occurs. Yank q806 and you may be able
to
> >check these MUST HAVES.
> >
> >Damon Brunger
> >damon101@xxxxxxxxxxxxxx
> >Telrad Electronic Services
> >Ft Wayne, IN 46815
> >----- Original Message -----
> >From: "LeRoy Westlund" <llw@xxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Sunday, August 25, 2002 6:58 PM
> >Subject: [TechAssist] Re: Update: T/A Sony PTV KP53S25 Fluid leakage -
> >[Repair or replace "E" board]
> >
> >
> >>
> >> OK, Damon,
> >> Now I have to eat my own words. Sorry,..but, I do NOT have high voltage
> >> afterall.
> >> It comes on for about one second,...then fades away.
> >> I thought it was there all this time, cause I could hear it come in.
> >> The set is going into high voltage shut down.
> >> I disconnected, and isolated the input to the splitter, and it blew my
> >high
> >> voltage output Q806 again.
> >> I have just about decided to replace the board, IF I can find one. I'll
> >> start looking come Monday morning.
> >> "E" board number A1343248A.
> >>
> >> Thanks for your time,
> >> LLW
> >>
> >> LeRoy Westlund
> >> Westlund TV & Electronics " It's such a pretty world
> >> 93 North Main today !....
> >> Centerfield, UT 84622-0087 Look at the Sunshine. "
> >> Ph./Fax 435-528-3822 :-)
> >> mailto:LLW@xxxxxxxxxx
> >>
> >> -----Original Message-----
> >> From: Damon <DAMON101@xxxxxxxxxxxxxx>
> >> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> >> Date: Sunday, August 25, 2002 4:38 PM
> >> Subject: [TechAssist] Re: Update: T/A Sony PTV KP53S25 Fluid leakage -
> >> [Repair or replace "E" board]
> >>
> >>
> >> >
> >> >Ok got some info here for you::: T803 is a separate Transformer for
> >> >heater/200v as you said, it's signal source is CN884, pin 6 (looks
like
> >> it's
> >> >looped back to pin 5, is it?)
> >> >
> >> >Pin 6/CN884 goes to BE of q810, to BC of q801, which drives pin 7/6
of
> >> >T802. Pin 2/3 of T802 drives BE of q806 and collector drives Pin 1 of
> >T803.
> >> >135 V to Primary is supplied to pin 9, out to pin 6, in to 4 before it
> >> comes
> >> >out to Pin 1.
> >> >
> >> >Pin 13 is connected to 135V, and pin 11 takes that, along with AC to
> >> convert
> >> >it to 200V, Heater is an isolated winding on T803, all go to Cn 802
> which
> >> >heads over to Red Crt.
> >> >
> >> >If you know for sure you have High Voltage, then Q806 and all
described
> >> >circuitry should be functioning as the HV xfmr is in parallel with
T803,
> >so
> >> >check Pin 9 for 135V and continuity from 9 to 6, 6 to 4, and 4 to 1.
It
> >> uses
> >> >2 separate windings in series with each other as the Primary and
that's
> >> it's
> >> >path to Q806 output.
> >> >HTH
> >> >Damon Brunger
> >> >damon101@xxxxxxxxxxxxxx
> >> >Telrad Electronic Services
> >> >Ft Wayne, IN 46815
> >> >----- Original Message -----
> >> >From: "LeRoy Westlund" <llw@xxxxxxxxxx>
> >> >To: <techassist@xxxxxxxxxxxxx>
> >> >Sent: Sunday, August 25, 2002 11:38 AM
> >> >Subject: [TechAssist] Re: Update: T/A Sony PTV KP53S25 Fluid leakage -
> >> >[Repair or replace "E" board]
> >> >
> >> >
> >> >>
> >> >> Damon,
> >> >> In this case I have High voltage. The 200 volts, and the filiment
> >> voltages
> >> >> are missing,...and they come from a seperate transformer, that is
> >driven
> >> >by
> >> >> the horz. drive. The high voltage comes from the SAME horz drive
that
> >> >> developes the 200 volts , and the filiments. The 200 volt source is
> >> really
> >> >> not LOW,(it is missing),...because the 130 volts that I am reading
is
> >> from
> >> >> the 130 volt B+ pwr. supply source. It is feeding back through the
> >ckts,
> >> >to
> >> >> the 200 volt supply line.
> >> >>
> >> >> >From what you are saying,...I guess it is NOT a 1 K problem.
> >> >> At this point, I'm not sure what it is. It's becoming more difficult
> to
> >> >> explain all the time.
> >> >> I know I should replace the "E" board,...but, I have been told from
> one
> >> >> source that it is NLA. I will try other sources,...come monday
> morning.
> >> >>
> >> >> Thanks,
> >> >> LLW
> >> >>
> >> >> LeRoy Westlund
> >> >> Westlund TV & Electronics " It's such a pretty world
> >> >> 93 North Main today !....
> >> >> Centerfield, UT 84622-0087 Look at the Sunshine. "
> >> >> Ph./Fax 435-528-3822 :-)
> >> >> mailto:LLW@xxxxxxxxxx
> >> >>
> >> >> -----Original Message-----
> >> >> From: Damon <DAMON101@xxxxxxxxxxxxxx>
> >> >> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> >> >> Date: Sunday, August 25, 2002 7:22 AM
> >> >> Subject: [TechAssist] Re: Update: T/A Sony PTV KP53S25 Fluid
leakage -
> >> >> [Repair or replace "E" board]
> >> >>
> >> >>
> >> >> >
> >> >> >If you're talking about an "IK" shutdown problem, your HV and
> >filaments
> >> >> >would be alive, but your video would be blanked, no signal to
> >cathodes.
> >> >> >
> >> >> >Your 200V supply to the cathodes can come from 2 sources in today's
> >> sets,
> >> >> >and since I don't have the schematics in front of me, I'll just say
> >that
> >> >> the
> >> >> >IHVT source may have a leaky cap or partially open resistor. If it
> >comes
> >> >> >from the SMPS, it may be the same thing, but I don't think Sony
> >> >redesigned
> >> >> >their chassis to use the Smps as that supply source. Of course low
> >200V
> >> >> >won't allow a proper IK pulse to be developed, thus blanking your
> >video.
> >> >No
> >> >> >way to disable this feed back circuit.
> >> >> >
> >> >> >Damon Brunger
> >> >> >damon101@xxxxxxxxxxxxxx
> >> >> >Telrad Electronic Services
> >> >> >Ft Wayne, IN 46815
> >> >> >----- Original Message -----
> >> >> >From: "LeRoy Westlund" <llw@xxxxxxxxxx>
> >> >> >To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> >> >> >Sent: Saturday, August 24, 2002 5:07 PM
> >> >> >Subject: [TechAssist] Update: T/A Sony PTV KP53S25 Fluid leakage -
> >> >[Repair
> >> >> >or replace "E" board]
> >> >> >
> >> >> >
> >> >> >>
> >> >> >> Hey guys,
> >> >> >> Is it normal to have a 1K shut down problem on a Sony PTV, after
> >> >> replacing
> >> >> >> the Blue CRT, for leakage ?
> >> >> >> I think that is my problem. I have double checked the "E" board.
I
> >> even
> >> >> >> removed the cable sockets, and cleaned under them. There is NO
> fluid
> >> >> >leakage
> >> >> >> on any of the other boards. The 130 volts I am reading, is the B+
> >> >voltage
> >> >> >> from the pwr. supply module. This voltage won't come up to 200
> >Volts,
> >> >and
> >> >> >I
> >> >> >> won't get my filiment voltage, if it is in 1K shutdown. Right ?
> >> >> >> Can I disable the 1K shut protect ckt, long enough to see if that
> is
> >> >> >indeed
> >> >> >> my problem ? How can I go about doing this ?
> >> >> >>
> >> >> >> LLW
> >> >> >>
> >> >> >> LeRoy Westlund
> >> >> >> Westlund TV & Electronics " It's such a pretty world
> >> >> >> 93 North Main today
!....
> >> >> >> Centerfield, UT 84622-0087 Look at the Sunshine. "
> >> >> >> Ph./Fax 435-528-3822 :-)
> >> >> >> mailto:LLW@xxxxxxxxxx
> >> >> >>
> >> >> >> -----Original Message-----
> >> >> >> From: LeRoy Westlund <llw@xxxxxxxxxx>
> >> >> >> To: TechAssist <techassist@xxxxxxxxxxxxx>
> >> >> >> Date: Friday, August 23, 2002 10:06 AM
> >> >> >> Subject: T/A Sony PTV KP53S25 Fluid leakage - [Repair or replace
> "E"
> >> >> >board]
> >> >> >>
> >> >> >>
> >> >> >> >Hi Techs.
> >> >> >> >I have this Sony PTV model KP53S25. I replaced the Blue CRT
> because
> >> of
> >> >> >> fluid
> >> >> >> >leakage. The fluid had dripped onto the "E" board. It made a
> >> >> contaminated
> >> >> >> >spot, about 3" in diameter. I cleaned the board with Chemtronics
> >> >> >> "Tuno-wash"
> >> >> >> >with a small brush,...then I sprayed it with Techspray video
head
> >> >> >> >cleaner,...and let it dry. It looked great. Nice and
clean,...and
> >no
> >> >> more
> >> >> >> >signs of contamination that I can see.
> >> >> >> >I replaced the shorted HVOT Q806 ( used original Sony part
> >> >number),..and
> >> >> >> >replaced the 2 transistors (Q601 amd Q602),and the fused (.1
ohm)
> >> >> >resistor
> >> >> >> >in the pwr. supply. Turned the set on,.....B+ came up to 130
> volts,
> >+
> >> >> >and -
> >> >> >> >15 volts are good,...High voltage came in OK. Problem is,...the
> >CRTs
> >> >> will
> >> >> >> >not light up, due to the 200 volt source from the "E" board is
> only
> >> at
> >> >> >130
> >> >> >> >volts. Also,...filiments do not light.(They also come from the
"E"
> >> >> >board).
> >> >> >> >If I disconnect the plug that delivers the 200 volts to the Red
> CRT
> >> >> >socket
> >> >> >> >module,...it will read 200 volts for a few seconds,...then
starts
> >> >> >counting
> >> >> >> >down and stabilizes at about 150 volts.
> >> >> >> >I have double checked all components and solder joints etc, on
the
> >> "E"
> >> >> >> >board,...but, cannot find anymore problems with it.
> >> >> >> >At this point,....I am looking to replace the board,....but, if
I
> >am
> >> >> >> >overlooking something simple,...I wish someone could point me in
> >the
> >> >> >right
> >> >> >> >direction. You could sure save me a lot of time, and $$$.
> >> >> >> >
> >> >> >> >Any help is appreciated,
> >> >> >> >LLW
> >> >> >> >
> >> >> >> >LeRoy Westlund
> >> >> >> >Westlund TV & Electronics " It's such a pretty world
> >> >> >> >93 North Main today
!....
> >> >> >> >Centerfield, UT 84622-0087 Look at the Sunshine. "
> >> >> >> >Ph./Fax 435-528-3822 :-)
> >> >> >> >mailto:LLW@xxxxxxxxxx
> >> >> >> >
> >> >> >> >
> >> >> >>
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