[TechAssist] Re: [Update 9-16-02] T/A Sony PTV KP53S25 Fluid leakage - [Repair or replace "E" board]
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 16 Sep 2002 09:31:05 -0600
There are 2 sets of rings on the neck of the CRT.
I assume the one closest to the yoke is the centering rings.
Is this correct ?
I don't want to change the adustments on the Green, and the Red, because
they are still working normal.
All I need to do, is drop the Blue about 1 inche. Blue Left, and right are
also working.
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: Monday, September 16, 2002 6:52 AM
Subject: [TechAssist] Re: [Update 9-16-02] T/A Sony PTV KP53S25 Fluid
leakage - [Repair or replace "E" board]
>
>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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