[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: Sun, 15 Sep 2002 23:25:20 -0600
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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