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Pioneer SD-P6081 convergence problem, tried replacing all caps + stk4277 = no luck. I need help or a

T

Te

Jan 1, 1970
0
I have a Pioneer SD-P 6081 model TV. I live in Texas near Dallas. My unit
was purchased new about 10 years ago (give or take)
The convergence went out suddenly... one session it was fine, the next
session it was skewed (ie: watched it at 8pm it was ok, powered it off,
powered it back on at 10pm and the convergence was off)

The repair guy estimated $400 repair to rebuild the convergence board
located in the front of the unit under the screen behind the speaker grille.
I read up on it a little, and discovered the "common" problem to this is a
bad/defective STK4277 chip. So I ordered one and replaced it. There was no
change in the screens convergence. I read a little more, and decided to
replace all 36 capacitors on the board- I did that, and still no change in
convergence. Nothing got better or worse. It simply stayed the same. The
problem is with the RED, its skewed around the edges, and it will not move
under the user controlled convergence settings in the menu. I have linked
to some pictures for your review. The center point red convergence moves
around fine, the edges do not move, or only move on 1 axis (ie: they'll move
up/down but not left/right). Now that I have replaced the STK4277 chip and
all the Caps on the board, I have no clue what do to next. ANY advice would
be most appreciated.

Here are some pictures, the filenames are pretty self explanatory.

http://home.comcast.net/~araltd/tvrepair/boardoldcomponents.jpg
http://home.comcast.net/~araltd/tvrepair/boardnewcomponents.jpg
http://home.comcast.net/~araltd/tvrepair/fullscreenconvergenceoff.jpg
http://home.comcast.net/~araltd/tvrepair/fullscreenconvergenceoff2.jpg
http://home.comcast.net/~araltd/tvrepair/rightsideconvergenceoff.jpg
http://home.comcast.net/~araltd/tvrepair/leftsideconvergenceoff.jpg
 
A

Alan Harriman

Jan 1, 1970
0
I have a Pioneer SD-P 6081 model TV. I live in Texas near Dallas. My unit
was purchased new about 10 years ago (give or take)
The convergence went out suddenly... one session it was fine, the next
session it was skewed (ie: watched it at 8pm it was ok, powered it off,
powered it back on at 10pm and the convergence was off)

The repair guy estimated $400 repair to rebuild the convergence board
located in the front of the unit under the screen behind the speaker grille.
I read up on it a little, and discovered the "common" problem to this is a
bad/defective STK4277 chip. So I ordered one and replaced it. There was no
change in the screens convergence. I read a little more, and decided to
replace all 36 capacitors on the board- I did that, and still no change in
convergence. Nothing got better or worse. It simply stayed the same. The
problem is with the RED, its skewed around the edges, and it will not move
under the user controlled convergence settings in the menu. I have linked
to some pictures for your review. The center point red convergence moves
around fine, the edges do not move, or only move on 1 axis (ie: they'll move
up/down but not left/right). Now that I have replaced the STK4277 chip and
all the Caps on the board, I have no clue what do to next. ANY advice would
be most appreciated.

A couple things to check. First, make sure you are using good replacement IC's.
Best to order them directly from Pioneer, as there are a couple variations.
Also, make sure the convergence plugs are in the proper locations on the
convergence pcb board. As I recall, the socket colors can be misleading.
Finally, check the power resistors for changes in value.

Alan Harriman
 
J

James Sweet

Jan 1, 1970
0
Alan Harriman said:
A couple things to check. First, make sure you are using good replacement IC's.
Best to order them directly from Pioneer, as there are a couple variations.
Also, make sure the convergence plugs are in the proper locations on the
convergence pcb board. As I recall, the socket colors can be misleading.
Finally, check the power resistors for changes in value.

They look like they're all white on that set, but on the P5071 they sure are
misleading! Red plug goes into the white socket, white plug goes into the
red socket, get them swapped and the STK blows up. Genius design!
 
T

Te

Jan 1, 1970
0
A couple things to check. First, make sure you are using good
replacement
IC's.

They look like they're all white on that set, but on the P5071 they sure are
misleading! Red plug goes into the white socket, white plug goes into the
red socket, get them swapped and the STK blows up. Genius design!

I've actually done all the modifications to the board without ever
disconnecting the convergence board. I only unplugged the TV from the wall,
so I know the cables are all connected properly, since I never disconnected
them.

I checked the resistance values on the resistors, and they are spot on. The
only one that was just a tiny tad high was the piggy backed one, so I
replaced those, screen has not changed a bit. Never got better and never
got worse.
 
J

James Sweet

Jan 1, 1970
0
Te said:
I've actually done all the modifications to the board without ever
disconnecting the convergence board. I only unplugged the TV from the wall,
so I know the cables are all connected properly, since I never disconnected
them.

I checked the resistance values on the resistors, and they are spot on. The
only one that was just a tiny tad high was the piggy backed one, so I
replaced those, screen has not changed a bit. Never got better and never
got worse.

Unplug the red convergence yoke and measure the impedance, could be an open
connection on the yoke.
 
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