Hello,

I have Sony PVM-2950 with pincushion problem.
The image bows toward the center of the screen from both top and
bottom. I believe this symptom is called "horizontal" or "north-
south" pincushion problem.
I tired to adjust it in service mode, but I was unable to control the
amount of bowing at top and bottom of the screen. I can control
barrel shaped pincushion (east-west) but it does nothing on top and
bottom of the screen.

Is there anything that I can adjust horizontal pincushion without
opening the set?
Could somebody please give me a clue on what is causing this problem
and where and what to look for?
I have a service manual but because I am not an expert, only thing I
can think of is some failure in VC, DX, or part of A board.

This is first time I'm posting, so please let me know if I'm doing
something wrong.
I would appreciate any response..

On Tue, 15 Jun 2010 12:09:45 -0700, Ippei Okamura �ʇoɹ�:

Hello,

I have Sony PVM-2950 with pincushion problem. The image bows toward the
center of the screen from both top and bottom. I believe this symptom
is called "horizontal" or "north- south" pincushion problem.
I tired to adjust it in service mode, but I was unable to control the
amount of bowing at top and bottom of the screen. I can control barrel
shaped pincushion (east-west) but it does nothing on top and bottom of
the screen.

Is there anything that I can adjust horizontal pincushion without
opening the set?
Could somebody please give me a clue on what is causing this problem and
where and what to look for?
I have a service manual but because I am not an expert, only thing I can
think of is some failure in VC, DX, or part of A board.

This is first time I'm posting, so please let me know if I'm doing
something wrong.
I would appreciate any response..

I've read somewhere those things have a hidden Optimode test pattern in
the service mode usefull for pincushion and convergence. But I have no
idea how to access it.

On Jun 15, 4:13Â*pm, Meat Plow wrote:
On Tue, 15 Jun 2010 12:09:45 -0700, Ippei Okamura �ʇoɹ�:



Hello,

I have Sony PVM-2950 with pincushion problem. The image bows toward the
center of the screen from both top and bottom. Â*I believe this symptom
is called "horizontal" or "north- south" pincushion problem.
I tired to adjust it in service mode, but I was unable to control the
amount of bowing at top and bottom of the screen. Â*I can control barrel
shaped pincushion (east-west) but it does nothing on top and bottom of
the screen.

Is there anything that I can adjust horizontal pincushion without
opening the set?
Could somebody please give me a clue on what is causing this problem and
where and what to look for?
I have a service manual but because I am not an expert, only thing I can
think of is some failure in VC, DX, or part of A board.

This is first time I'm posting, so please let me know if I'm doing
something wrong.
I would appreciate any response..

I've read somewhere those things have a hidden Optimode test pattern in
the service mode usefull for pincushion and convergence. But I have no
idea how to access it.

Thank you for reply!

Yes, if it can generate such pattern by itself, it would be really
helpful.
I heard that Sony BVM series can generate cross-hatch by itself but
that series is for mastering at broadcast stations and might cost
triple of PVM series.

On Tue, 15 Jun 2010 12:09:45 -0700 (PDT), Ippei Okamura
wrote:

Hello,

I have Sony PVM-2950 with pincushion problem.
The image bows toward the center of the screen from both top and
bottom. I believe this symptom is called "horizontal" or "north-
south" pincushion problem.
I tired to adjust it in service mode, but I was unable to control the
amount of bowing at top and bottom of the screen. I can control
barrel shaped pincushion (east-west) but it does nothing on top and
bottom of the screen.

Is there anything that I can adjust horizontal pincushion without
opening the set?
Could somebody please give me a clue on what is causing this problem
and where and what to look for?
I have a service manual but because I am not an expert, only thing I
can think of is some failure in VC, DX, or part of A board.

This is first time I'm posting, so please let me know if I'm doing
something wrong.
I would appreciate any response..


Do you have an ESR meter? We usually find many bad electrolytics in
the deflection circuits of these units. Electrolytic failure causes
the majority of all failures on this model including pincushioning.
Chuck

On Jun 17, 8:40*am, Chuck wrote:
Do you have an ESR meter? *We usually find many bad electrolytics in
the deflection circuits of these units. Electrolytic failure causes
the majority of all failures on this model including pincushioning.
Chuck

Thank you for reply!

No, I don't have ESR meter. Only tool I have is 29-Range Digital
Multimeter from RadioShack.
For N/S pincushion problem, could you please specify which
electrolytics I should be looking? Or maybe just an idea on what area
or which board? I'm guessing C18xx's in VC board and C5xx's in A
board but since I'm not a professional repair person, I cannot be sure
about it...