Viewsonic VP201b service manual??

[Jack]

Anybody have one, or know where to download one?

Have problem with picture rotating from top to bottom.

-Jan
Finland

 

On Tue, 09 Jun 2009 17:28:43 GMT, "Jack"
<jan.kronlundREMOVE@pp.inet.fi> wrote:

Anybody have one, or know where to download one?

Have problem with picture rotating from top to bottom.

-Jan
Finland

Finding service manuals / schematics for LCD monitors is pretty

difficult.

I have several of these monitors (including the one I'm using as I
type) and got to know it's layout quite well. I'm a little puzzeled
by your description of the problem. Could you explain in more detail?

One place I repeatedly suggest people with monitor problems visit is
www.badcaps.net/forum It's a great place to get help.

PlainBill

 

[Jack]

<PlainBill47@yahoo.com> wrote in message
news:qhft259flmr860blfd8s39ohq3eteuqsub@4ax.com...

On Tue, 09 Jun 2009 17:28:43 GMT, "Jack"
jan.kronlundREMOVE@pp.inet.fi> wrote:

Anybody have one, or know where to download one?

Have problem with picture rotating from top to bottom.

-Jan
Finland

Finding service manuals / schematics for LCD monitors is pretty
difficult.

I have several of these monitors (including the one I'm using as I
type) and got to know it's layout quite well. I'm a little puzzeled
by your description of the problem. Could you explain in more detail?

One place I repeatedly suggest people with monitor problems visit is
www.badcaps.net/forum It's a great place to get help.

PlainBill

I will have to see, when I get it in front of me, but I was told that the
picture rolls from top to bottom.

Anyway, I will get it in a couple of days, so I can give better description.

-Jan
Finland

 

[Jack]

"Jack" <jan.kronlundREMOVE@pp.inet.fi> wrote in message
news:FQHXl.13$5M2.11@read4.inet.fi...

PlainBill47@yahoo.com> wrote in message
news:qhft259flmr860blfd8s39ohq3eteuqsub@4ax.com...
On Tue, 09 Jun 2009 17:28:43 GMT, "Jack"
jan.kronlundREMOVE@pp.inet.fi> wrote:

Anybody have one, or know where to download one?

Have problem with picture rotating from top to bottom.

-Jan
Finland

Finding service manuals / schematics for LCD monitors is pretty
difficult.

I have several of these monitors (including the one I'm using as I
type) and got to know it's layout quite well. I'm a little puzzeled
by your description of the problem. Could you explain in more detail?

One place I repeatedly suggest people with monitor problems visit is
www.badcaps.net/forum It's a great place to get help.

PlainBill

I will have to see, when I get it in front of me, but I was told that the
picture rolls from top to bottom.

Anyway, I will get it in a couple of days, so I can give better
description.

-Jan
Finland

I finally received this monitor and when I plugged it in, it worked

perfectly.
I decided to open it anyway, since I have been reading a lot about bad caps
in Viewsonic's.
I found that the main 400VDC filter cap was totally off from PCB on the +
side and one dry joint on one of the power transistors.
So, after few days of burn-in, it seems to fine. Thanks for pointing me
right direction.

-Jan

 

[Joe]

"Jack" <jan.kronlundREMOVE@pp.inet.fi> wrote in message
news:AerZl.51$LV.44@read4.inet.fi...

"Jack" <jan.kronlundREMOVE@pp.inet.fi> wrote in message
news:FQHXl.13$5M2.11@read4.inet.fi...

PlainBill47@yahoo.com> wrote in message
news:qhft259flmr860blfd8s39ohq3eteuqsub@4ax.com...
On Tue, 09 Jun 2009 17:28:43 GMT, "Jack"
jan.kronlundREMOVE@pp.inet.fi> wrote:

Anybody have one, or know where to download one?

Have problem with picture rotating from top to bottom.

-Jan
Finland

Finding service manuals / schematics for LCD monitors is pretty
difficult.

I have several of these monitors (including the one I'm using as I
type) and got to know it's layout quite well. I'm a little puzzeled
by your description of the problem. Could you explain in more detail?

One place I repeatedly suggest people with monitor problems visit is
www.badcaps.net/forum It's a great place to get help.

PlainBill

I will have to see, when I get it in front of me, but I was told that the
picture rolls from top to bottom.

Anyway, I will get it in a couple of days, so I can give better
description.

-Jan
Finland

I finally received this monitor and when I plugged it in, it worked
perfectly.
I decided to open it anyway, since I have been reading a lot about bad
caps in Viewsonic's.
I found that the main 400VDC filter cap was totally off from PCB on the +
side and one dry joint on one of the power transistors.
So, after few days of burn-in, it seems to fine. Thanks for pointing me
right direction.

-Jan

The original problem has come back, I guess the faults that I fixed, were

not the correct ones.
Here is a video of the fault, which seems to come and go:
http://www.youtube.com/watch?v=azFRo8uhad0

-Jan

 

[Mark Zacharias]

"Joe" <jan.kronlundPOISTA@pp.inet.fi> wrote in message
news:8VPZl.107$8V4.18@read4.inet.fi...

"Jack" <jan.kronlundREMOVE@pp.inet.fi> wrote in message
news:AerZl.51$LV.44@read4.inet.fi...

"Jack" <jan.kronlundREMOVE@pp.inet.fi> wrote in message
news:FQHXl.13$5M2.11@read4.inet.fi...

PlainBill47@yahoo.com> wrote in message
news:qhft259flmr860blfd8s39ohq3eteuqsub@4ax.com...
On Tue, 09 Jun 2009 17:28:43 GMT, "Jack"
jan.kronlundREMOVE@pp.inet.fi> wrote:

Anybody have one, or know where to download one?

Have problem with picture rotating from top to bottom.

-Jan
Finland

Finding service manuals / schematics for LCD monitors is pretty
difficult.

I have several of these monitors (including the one I'm using as I
type) and got to know it's layout quite well. I'm a little puzzeled
by your description of the problem. Could you explain in more detail?

One place I repeatedly suggest people with monitor problems visit is
www.badcaps.net/forum It's a great place to get help.

PlainBill

I will have to see, when I get it in front of me, but I was told that
the picture rolls from top to bottom.

Anyway, I will get it in a couple of days, so I can give better
description.

-Jan
Finland

I finally received this monitor and when I plugged it in, it worked
perfectly.
I decided to open it anyway, since I have been reading a lot about bad
caps in Viewsonic's.
I found that the main 400VDC filter cap was totally off from PCB on the +
side and one dry joint on one of the power transistors.
So, after few days of burn-in, it seems to fine. Thanks for pointing me
right direction.

-Jan

The original problem has come back, I guess the faults that I fixed, were
not the correct ones.
Here is a video of the fault, which seems to come and go:
http://www.youtube.com/watch?v=azFRo8uhad0

-Jan

I would look for other bad caps in the power supply. Even the one you
mentioned could be open-circuit. I often see caps in the 1000 to 2200 uF
range bad, often with vented (bulged) tops, and more and more seeing the
input filters (ex 150uF at 250 volt) snap-in types bad. Cheap crap...

Mark Z.

 

[Joe]

"Mark Zacharias" <mark_zacharias@labolgcbs.net> wrote in message
news:Cn2_l.22$Dx2.0@flpi146.ffdc.sbc.com...

"Joe" <jan.kronlundPOISTA@pp.inet.fi> wrote in message
news:8VPZl.107$8V4.18@read4.inet.fi...

"Jack" <jan.kronlundREMOVE@pp.inet.fi> wrote in message
news:AerZl.51$LV.44@read4.inet.fi...

"Jack" <jan.kronlundREMOVE@pp.inet.fi> wrote in message
news:FQHXl.13$5M2.11@read4.inet.fi...

PlainBill47@yahoo.com> wrote in message
news:qhft259flmr860blfd8s39ohq3eteuqsub@4ax.com...
On Tue, 09 Jun 2009 17:28:43 GMT, "Jack"
jan.kronlundREMOVE@pp.inet.fi> wrote:

Anybody have one, or know where to download one?

Have problem with picture rotating from top to bottom.

-Jan
Finland

Finding service manuals / schematics for LCD monitors is pretty
difficult.

I have several of these monitors (including the one I'm using as I
type) and got to know it's layout quite well. I'm a little puzzeled
by your description of the problem. Could you explain in more detail?

One place I repeatedly suggest people with monitor problems visit is
www.badcaps.net/forum It's a great place to get help.

PlainBill

I will have to see, when I get it in front of me, but I was told that
the picture rolls from top to bottom.

Anyway, I will get it in a couple of days, so I can give better
description.

-Jan
Finland

I finally received this monitor and when I plugged it in, it worked
perfectly.
I decided to open it anyway, since I have been reading a lot about bad
caps in Viewsonic's.
I found that the main 400VDC filter cap was totally off from PCB on the
+ side and one dry joint on one of the power transistors.
So, after few days of burn-in, it seems to fine. Thanks for pointing me
right direction.

-Jan

The original problem has come back, I guess the faults that I fixed, were
not the correct ones.
Here is a video of the fault, which seems to come and go:
http://www.youtube.com/watch?v=azFRo8uhad0

-Jan



I would look for other bad caps in the power supply. Even the one you
mentioned could be open-circuit. I often see caps in the 1000 to 2200 uF
range bad, often with vented (bulged) tops, and more and more seeing the
input filters (ex 150uF at 250 volt) snap-in types bad. Cheap crap...

Mark Z.
I ESR'd all the caps on power supply PCB and they tested out fine.

Also, no leaks or bulges.

-Jan

 

[Mark Zacharias]

I ESR'd all the caps on power supply PCB and they tested out fine.
Also, no leaks or bulges

A shame you didn't say so previously...

mz

 

[Michael A. Terrell]

Joe wrote:

I ESR'd all the caps on power supply PCB and they tested out fine.
Also, no leaks or bulges.

Are any of the caps in parallel? If so, one or more could be open,
yet you still read a decent ESR from the good ones.


--
You can't have a sense of humor, if you have no sense!

 

[Joe]

"Mark Zacharias" <mark_zacharias@labolgcbs.net> wrote in message
news:w1i_l.97$bq1.74@nlpi066.nbdc.sbc.com...

I ESR'd all the caps on power supply PCB and they tested out fine.
Also, no leaks or bulges


A shame you didn't say so previously...

mz

Well, sorry about that.

Also the fault seems to have something to do with contact, since giving the
display a slap on the top left corner (while the display goes crazy) makes
it return to normal...

-J-

 

[Bob Larter]

Joe wrote:

"Mark Zacharias" <mark_zacharias@labolgcbs.net> wrote in message
news:w1i_l.97$bq1.74@nlpi066.nbdc.sbc.com...
I ESR'd all the caps on power supply PCB and they tested out fine.
Also, no leaks or bulges

A shame you didn't say so previously...

mz

Well, sorry about that.

Also the fault seems to have something to do with contact, since giving the
display a slap on the top left corner (while the display goes crazy) makes
it return to normal...

Try re-seating the connectors in the sensitive part of the panel.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

 

[Mark Zacharias]

"Joe" <jan.kronlundPOISTA@pp.inet.fi> wrote in message
news:vy0%l.9$z41.4@read4.inet.fi...

"Mark Zacharias" <mark_zacharias@labolgcbs.net> wrote in message
news:w1i_l.97$bq1.74@nlpi066.nbdc.sbc.com...
I ESR'd all the caps on power supply PCB and they tested out fine.
Also, no leaks or bulges


A shame you didn't say so previously...

mz

Well, sorry about that.

Also the fault seems to have something to do with contact, since giving
the display a slap on the top left corner (while the display goes crazy)
makes it return to normal...

-J-

I'd still watch out for that main filter cap; I've seen them be
intermittent... and given that you saw a problem there I'd certainly keep it
in mind.

Mark Z.