Picasso II Burned Resistor

Brosol · 23 February 2010, 06:09

I have a Picasoo II Ver 1.4, A resistor near VGA input port (for pass through native Amiga modes) is burnt out. I think I can desolder and remove the bad resistor but can't make out the value. The screen output is unstable, jittery, rolling. I removed the Picasso from my A3000 until this is fixed.

Will someone with the same model Picasso take a peek to tell me the resistor value? Thanks

A stock photo, a close match I think

zipper · 23 February 2010, 06:18

This might help:
http://www.amiga-resistance.info/dow...soii_1_big.jpg

Brosol · 23 February 2010, 06:47

Thats what I needed, Mucho Thanks

Brosol · 23 February 2010, 08:47

I failed to mention I was testing my A3000 Picasso II setup with a LCD monitors....17in Samsung SyncMaster 171S, Dell 15in....when I noticed the display problems. I read some threads regarding problems with LCDs due 5v from Picasso pin 9:

http://www.amiga.org/forums/showthread.php?t=40918

http://eabmobile.abime.net/showthrea...549#post590549

http://www.amiga.org/forums/showthre...casso+resistor

Could this have caused the burnt out resistor on my Picasso II?
If I replace the resistor and continue to use LCD would the problem return again. The thread implies leaving out or removing the Picasso resistor, modding a cable to remove pin 9 or just use old CRT monitors blah?

hese · 24 February 2010, 08:58

Whoa, I got the exactly same problem (burned resistor) yesterday when I tested my PII on an another monitor. Hope we get this sorted.

Brosol · 24 February 2010, 09:15

Hese, I found this thread helpful:

http://www.amibay.com/showthread.php?t=4808

I removed the burnt resistor but will not replace it. Picasso II has a dangerous and redundant feature....current unregulated 5V to pin 9. The Picasso II works fine with a Samsung SyncMaster 750S CRT but does not like a Samsung SyncMaster 171S LCD.

So with my setup CRT works fine. The trick is to find a Picasso II friendly LCD.
I'm glad no other damage was done besides the burnt out resistor.

hese · 24 February 2010, 11:29

Thanks Brosol, I'll remove the resistor and check if the card still works.
I have two CRTs, one gives distorted image but the other one worked fine (until the resistor blew up).

The strange thing is even the passed through video does not work with the first monitor.
Picasso shouldn't alter the signal AFAIK.

chiark · 24 February 2010, 11:56

hese, I assume you're passing a scandoubled video signal through the P2?

hese · 25 February 2010, 08:50

chiark, sure. It's scandoubled but still scrambled.

I removed the resistor and now the card doesn't feed anything to pin 9.
Now the card works fine on both CRT monitors!

By the way, according to the Picasso manual the card feeds 12 volts to the pin, not 5 volts.
But anyway, it finally works..

source · 24 September 2010, 05:15

Is this problem limited to the picasso II board or do other video cards or scan doublers have a similar issue?

rkauer · 24 September 2010, 23:35

@Source: it is a problem of two technologically different eras clashing: on Amiga era the pin was not used for it is used today: check the boards you intend to hook on modern monitors.

Brosol · 25 September 2010, 00:06

I've recently upgraded to a Cybervision 64 4MB to support the A3000's Zorro 3...much faster than Zorro 2 PicassoII.

I am using Asus VW266H 25.5" 2ms 1920x1200 20000:1 DVI/HDMI LCD Monitor to share between a PC and A3000..it works great with CV64 and PicassoII.

I am thinking about selling the Picasso II which includes original disks, manual and box.

Cosmos · 17 January 2011, 15:02

What is the value of this resistor ??

FOL · 17 January 2011, 15:15

Quote:

Originally Posted by Cosmos

What is the value of this resistor ??

From pic posted, looks like 100 ohm with 10% tolerance?

mech · 17 January 2011, 18:42

Quote:

Originally Posted by Brosol

I have a Picasoo II Ver 1.4, A resistor near VGA input port (for pass through native Amiga modes) is burnt out. I think I can desolder and remove the bad resistor but can't make out the value. The screen output is unstable, jittery, rolling. I removed the Picasso from my A3000 until this is fixed.
Will someone with the same model Picasso take a peek to tell me the resistor value? Thanks

DO NOT replace the resistor,leave it off. This was for the old vesa standard.Some newer monitors ground this PIN and thats why it fries. I ran into this long ago and contacted someone who worked on the PIcasso II boards,and this is the reply:

"Hi,

the card will live happily without the resistor. It was meant to supply 12v on an output pin regarding an old vesa standard to supply an external monitor switch. Today this supply isn't needed anymore just leave the resistor off the board. It wont do any harm.

regs
Tobias"

chiark · 17 January 2011, 19:21

Agreed. Leave it off. I have a board that has had it removed after what must have been a small fire, and it works perfectly

SpeedGeek · 18 January 2011, 03:26

Quote:

Originally Posted by Brosol

I've recently upgraded to a Cybervision 64 4MB to support the A3000's Zorro 3...much faster than Zorro 2 PicassoII.

I am using Asus VW266H 25.5" 2ms 1920x1200 20000:1 DVI/HDMI LCD Monitor to share between a PC and A3000..it works great with CV64 and PicassoII.

I am thinking about selling the Picasso II which includes original disks, manual and box.

SuperBuster actually runs Zorro2 cycles slower than A2000 Buster! I discovered this when I installed my PicassoII and A2091 w/2MB in my A3000. The bustest results I obtained were:

A3000 Bustest A2000 Bustest
PicassoII 2.2 MBS 2.8 MBS
A2091 2.5 MBS 3.5 MBS

I developed a SuperBuster timing mod to get Zorro2 cards running at full speed. I should start a thread in Hardware Mods on how to do this. Of course Zorro3 will always be faster than Zorro2.

Cosmos · 18 January 2011, 06:18

= A3000 Bustest A2000 Bustest
PicassoII 2.2 MBS 2.8 MBS
A2091 2.5 MBS 3.5 MBS

What ??? I can't believe...

Cosmos · 18 January 2011, 07:05

I can't believe... SuperBuster is slower than the Buster ?

chiark · 18 January 2011, 16:08

It's not surprising: Zorro III has a Zorro II compatibility mode that repurposes pins on the Z3 bus to support Z2.

Z2 compatibility mode on Z3 is driven by a state machine that basically emulates the 68k bus protocol: it's an emulation! Sometimes an extra wait state might be introduced in Z2,and sometimes the cycle switching from Z2 to Z3 and back may cause a delay or a cycle to be missed.

It's absolutely incredible that these two buses are compatible and can work together as they're so different: it's a wonderful hack

23 February 2010, 06:09	#1
Brosol Brosol Join Date: Jan 2010 Location: Vancouver, BC, Canada Posts: 85	Picasso II Burnt Out Resistor I have a Picasoo II Ver 1.4, A resistor near VGA input port (for pass through native Amiga modes) is burnt out. I think I can desolder and remove the bad resistor but can't make out the value. The screen output is unstable, jittery, rolling. I removed the Picasso from my A3000 until this is fixed. Will someone with the same model Picasso take a peek to tell me the resistor value? Thanks A stock photo, a close match I think Last edited by Brosol; 23 February 2010 at 09:27.

23 February 2010, 08:47	#4
Brosol Brosol Join Date: Jan 2010 Location: Vancouver, BC, Canada Posts: 85	Picasso II & LCD Problems? I failed to mention I was testing my A3000 Picasso II setup with a LCD monitors....17in Samsung SyncMaster 171S, Dell 15in....when I noticed the display problems. I read some threads regarding problems with LCDs due 5v from Picasso pin 9: http://www.amiga.org/forums/showthread.php?t=40918 http://eabmobile.abime.net/showthrea...549#post590549 http://www.amiga.org/forums/showthre...casso+resistor Could this have caused the burnt out resistor on my Picasso II? If I replace the resistor and continue to use LCD would the problem return again. The thread implies leaving out or removing the Picasso resistor, modding a cable to remove pin 9 or just use old CRT monitors blah? Last edited by Brosol; 23 February 2010 at 09:07.

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23 February 2010, 06:18	#2
zipper Registered User Join Date: Mar 2004 Location: finland Posts: 1,838	This might help: http://www.amiga-resistance.info/dow...soii_1_big.jpg

23 February 2010, 06:47	#3
Brosol Brosol Join Date: Jan 2010 Location: Vancouver, BC, Canada Posts: 85	Thats what I needed, Mucho Thanks

24 February 2010, 08:58	#5
hese Registered User Join Date: Sep 2008 Location: Somewhere Posts: 223	Whoa, I got the exactly same problem (burned resistor) yesterday when I tested my PII on an another monitor. Hope we get this sorted.

24 February 2010, 09:15	#6
Brosol Brosol Join Date: Jan 2010 Location: Vancouver, BC, Canada Posts: 85	Hese, I found this thread helpful: http://www.amibay.com/showthread.php?t=4808 I removed the burnt resistor but will not replace it. Picasso II has a dangerous and redundant feature....current unregulated 5V to pin 9. The Picasso II works fine with a Samsung SyncMaster 750S CRT but does not like a Samsung SyncMaster 171S LCD. So with my setup CRT works fine. The trick is to find a Picasso II friendly LCD. I'm glad no other damage was done besides the burnt out resistor.

24 February 2010, 11:29	#7
hese Registered User Join Date: Sep 2008 Location: Somewhere Posts: 223	Thanks Brosol, I'll remove the resistor and check if the card still works. I have two CRTs, one gives distorted image but the other one worked fine (until the resistor blew up). The strange thing is even the passed through video does not work with the first monitor. Picasso shouldn't alter the signal AFAIK.

24 February 2010, 11:56	#8
chiark Needs a life Join Date: Jan 2008 Location: England Posts: 1,707	hese, I assume you're passing a scandoubled video signal through the P2?

25 February 2010, 08:50	#9
hese Registered User Join Date: Sep 2008 Location: Somewhere Posts: 223	chiark, sure. It's scandoubled but still scrambled. I removed the resistor and now the card doesn't feed anything to pin 9. Now the card works fine on both CRT monitors! By the way, according to the Picasso manual the card feeds 12 volts to the pin, not 5 volts. But anyway, it finally works..

24 September 2010, 05:15	#10
source Zone Friend Join Date: Jul 2005 Location: Toronto, Canada Posts: 734	Is this problem limited to the picasso II board or do other video cards or scan doublers have a similar issue?

24 September 2010, 23:35	#11
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	@Source: it is a problem of two technologically different eras clashing: on Amiga era the pin was not used for it is used today: check the boards you intend to hook on modern monitors.

25 September 2010, 00:06	#12
Brosol Brosol Join Date: Jan 2010 Location: Vancouver, BC, Canada Posts: 85	I've recently upgraded to a Cybervision 64 4MB to support the A3000's Zorro 3...much faster than Zorro 2 PicassoII. I am using Asus VW266H 25.5" 2ms 1920x1200 20000:1 DVI/HDMI LCD Monitor to share between a PC and A3000..it works great with CV64 and PicassoII. I am thinking about selling the Picasso II which includes original disks, manual and box.

17 January 2011, 15:02	#13
Cosmos Banned Join Date: Jan 2007 Location: France Posts: 655	What is the value of this resistor ??

17 January 2011, 19:21	#16
chiark Needs a life Join Date: Jan 2008 Location: England Posts: 1,707	Agreed. Leave it off. I have a board that has had it removed after what must have been a small fire, and it works perfectly

18 January 2011, 06:18	#18
Cosmos Banned Join Date: Jan 2007 Location: France Posts: 655	= A3000 Bustest A2000 Bustest PicassoII 2.2 MBS 2.8 MBS A2091 2.5 MBS 3.5 MBS What ??? I can't believe...

18 January 2011, 07:05	#19
Cosmos Banned Join Date: Jan 2007 Location: France Posts: 655	I can't believe... SuperBuster is slower than the Buster ?

18 January 2011, 16:08	#20
chiark Needs a life Join Date: Jan 2008 Location: England Posts: 1,707	It's not surprising: Zorro III has a Zorro II compatibility mode that repurposes pins on the Z3 bus to support Z2. Z2 compatibility mode on Z3 is driven by a state machine that basically emulates the 68k bus protocol: it's an emulation! Sometimes an extra wait state might be introduced in Z2,and sometimes the cycle switching from Z2 to Z3 and back may cause a delay or a cycle to be missed. It's absolutely incredible that these two buses are compatible and can work together as they're so different: it's a wonderful hack

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