Samsung monitor / Wei Ya Chassis

For monitor related issues
Forum rules
ArcadeOtaku forum introduction & rules
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 15th, 2017, 10:57 am

next you would need to check the vertical deflection 25v line
check for bad solder joints,in particular on the connectors both ends of the switching board
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 15th, 2017, 9:52 pm

grantspain wrote:next you would need to check the vertical deflection 25v line
check for bad solder joints,in particular on the connectors both ends of the switching board



Indeed, I see several bad solder joints. One that stands out seems to be the first pin on the Flyback, it's so bad that the pin actually moves around. This may very well be the issue I hope!

One other question before i begin re-flowing these points. I found a diode that is small and orange that has a 48 on it. This diode seems to measuring quite low compared to other similar diodes on the board. The location is a bit hard to read but it is just near the resistor located in R8. I am getting a diode measurement of 0.028. Is this normal, or should I source a diode to replace it?

I appreciate the help, and I definitely owe you a beer!

Thanks
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 15th, 2017, 11:12 pm

lift one end of the diode and read again,it may be across another component
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 16th, 2017, 7:53 am

After repairing the solder points, I reconnected the board. Still clicking with no visual. I will pull the board in the morning and proceed with testing the vertical IC and diode. Is there any specific way to test the vertical IC as it ha more than three pins? I am going to order an ESR tester tomorrow for the caps. This is a painfully terrible headache.
User avatar
Sp33dFr34k
Posts: 188
Joined: December 3rd, 2011, 12:27 pm
eBay: 3d_collector
Location: The Netherlands

Re: Samsung monitor / Wei Ya Chassis

Postby Sp33dFr34k » January 16th, 2017, 8:17 am

I had a broken vertical IC on my Wei-Ya 3129A but it wasn't clicking, just showing a line down the middle. If you still want to check it out I'd just replace as it costs next to nothing anyway.
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 16th, 2017, 11:16 pm

Sp33dFr34k wrote:I had a broken vertical IC on my Wei-Ya 3129A but it wasn't clicking, just showing a line down the middle. If you still want to check it out I'd just replace as it costs next to nothing anyway.


Much appreciated. I will definitely have to swap it out then. Any idea of where to order it? I checked Mouser and amazon to no avail.

Couple of questions. I have included a couple pics to help describe what I am asking.

1. What could this tiny plastic piece go to? There was a slightly larger one, but I can't seem to find it now.

2. On the tube I noticed two connectors with possible wires missing. Is this of any importance?
Attachments
IMG_3992.JPG
IMG_3995.JPG
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 17th, 2017, 12:30 am

ignore the yoke pins

would be good to see that other bit of plastic,could be nothing but there again could be part of an ic
Londoncalling
Posts: 53
Joined: December 18th, 2013, 12:17 am

Re: Samsung monitor / Wei Ya Chassis

Postby Londoncalling » January 17th, 2017, 1:27 am

Those 2 connectors are of no importance. That plastic bit seems to just be a random piece of plastic.
User avatar
Sp33dFr34k
Posts: 188
Joined: December 3rd, 2011, 12:27 pm
eBay: 3d_collector
Location: The Netherlands

Re: Samsung monitor / Wei Ya Chassis

Postby Sp33dFr34k » January 17th, 2017, 8:10 am

I desoldered it, checked the type on the vertical IC itself and ordered one on eBay :)
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 17th, 2017, 10:08 am

Sp33dFr34k wrote:I desoldered it, checked the type on the vertical IC itself and ordered one on eBay :)

you will need to check the vcc 26v as well,sometimes those vertical fail and short out the 26v line,it will take out a safety resistor if that happens
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 17th, 2017, 6:02 pm

grantspain wrote:
Sp33dFr34k wrote:I desoldered it, checked the type on the vertical IC itself and ordered one on eBay :)

you will need to check the vcc 26v as well,sometimes those vertical fail and short out the 26v line,it will take out a safety resistor if that happens


Where about is it located? Near the vertical ic chip? i havent really checked resistors yet. I had checked just about every transistor imaginable. I am about to order some caps for the hell of it. But honestly, i cant seem to find any bad components. i think i find a short, desolder It, an then it tests fine. Frustrating.
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 17th, 2017, 8:32 pm

r50 1ohm 1watt,you can test the voltage there,not worth changing if the 26v is present on the output of the resistor
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 18th, 2017, 2:32 am

grantspain wrote:r50 1ohm 1watt,you can test the voltage there,not worth changing if the 26v is present on the output of the resistor


Ok, so the monitor need to be plugged in and on I am assuming? Thanks.

I have been removing the old dry glue as it can supposedly create a short when dried. Thanks.
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 18th, 2017, 6:48 am

djsniperwolf wrote:
grantspain wrote:r50 1ohm 1watt,you can test the voltage there,not worth changing if the 26v is present on the output of the resistor


Ok, so the monitor need to be plugged in and on I am assuming? Thanks.

I have been removing the old dry glue as it can supposedly create a short when dried. Thanks.


yes you would need to check with power on

the glue around the custom ic's and switch board header in particular need to be cleaned away
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 20th, 2017, 9:32 pm

I am currently in the process of ordering the caps. As I was removing much of the glue, I noticed a couple resistors look pretty bad and need replacing. Unfortunately I cannot see the the banding.

Do you know the required resistors for

R120
R32

Once I get these caps in, I will proceed with a powered test of the previously mentioned components.

I had contacted Alva Amusements last week, but I have not received a response regarding a replacement chassis.

EDIT:
I am selecting the caps from Digikey, which is where I order most of my circuitry components. I noticed a difference in ripple current and impedance, do these numbers matter? Thanks again.
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 20th, 2017, 10:43 pm

r32 33k 1/4w
r120 6r8 1/4w

caps values,as long as the farads are correct and the voltage equal or more than should make no real difference

these are frustrating chassis,there are forum members on byoac who claim to have 100% repair rate on these chassis,mine is about 70%-i think they are talking **** as they never supply any solid info

the pic ic can also cause issues,diodes in secondardy section,caps,hv caps---the list goes on with these chassis
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 22nd, 2017, 7:40 pm

grantspain wrote:r32 33k 1/4w
r120 6r8 1/4w

caps values,as long as the farads are correct and the voltage equal or more than should make no real difference

these are frustrating chassis,there are forum members on byoac who claim to have 100% repair rate on these chassis,mine is about 70%-i think they are talking **** as they never supply any solid info

the pic ic can also cause issues,diodes in secondardy section,caps,hv caps---the list goes on with these chassis


I am truly beginning to see the difficulties with this board... I will attempt some replacements the caps. But if that doesn't prove to be fruitful, would the C3129DS chassis work? I found one for sale and figure I could cut my losses instead of attempting multiple repairs until I botch this chassis. Too many components to weed through, and I do not see any heat marks or damage to the board..

If you have a bitcoin address, i'd like to send you some coin for that beer I promised :)

Thanks again Grant, you have been super helpful.
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 22nd, 2017, 11:23 pm

all you need from the seller of the chassis are the yoke details and socket type-yoke details are on sticker on the chassis and crt socket is obvious if its dual focus as it has two focus pins
in general a m3129 chassis will be 0.300mh lh,a suffix "d" will mean dynaflat

the photo i found online suggests this is a single focus chassis that runs on a 0.300mh deflection yoke
User avatar
djsniperwolf
Posts: 44
Joined: January 10th, 2017, 8:20 pm
Location: california

Re: Samsung monitor / Wei Ya Chassis

Postby djsniperwolf » January 24th, 2017, 9:06 pm

grantspain wrote:all you need from the seller of the chassis are the yoke details and socket type-yoke details are on sticker on the chassis and crt socket is obvious if its dual focus as it has two focus pins
in general a m3129 chassis will be 0.300mh lh,a suffix "d" will mean dynaflat

the photo i found online suggests this is a single focus chassis that runs on a 0.300mh deflection yoke


Ok, so I have decided to officially give up on repairing this chassis. I had never had so many issues with any other monitor chassis in my life. I miss the reliability of the old K7000's. Anyways, Alva amusements has finally gotten back to me regarding an available 3129D chassis. So... Below I included a link to the other chassis that is available. As my experience is lack luster, what would you personally recommend? I am ultimately trying to avoid these same issues in the future.

https://www.arcade-game-sales.com/arcad ... 869-1.html

Thanks again Grant. Your expertise in the matter has really guided me through this treacherous path.
User avatar
grantspain
Tech Head
Posts: 4598
Joined: August 17th, 2008, 4:23 pm
Aliases: gunblade
Location: down south

Re: Samsung monitor / Wei Ya Chassis

Postby grantspain » January 24th, 2017, 9:39 pm

if your tube is dual or single focus?

Return to “Monitor Q&A”



Who is online

Users browsing this forum: No registered users