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Author Topic: scud race / nanao ms9-29su missing a color (SOLVED)  (Read 19838 times)

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princess prin prin

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Re: scud race / nanao ms9-29su missing a color
« Reply #40 on: November 18, 2018, 06:36:49 am »
So it seems that i have wrecked my monitor. Its an hitachi a68ksa30x.

Measure the resistance across pins 9 and 10. If it's good it will be very low. If it's open the tube is ready for the trash can.

https://wiki.arcadeotaku.com/images/8/8e/B10-277.jpg

perjmolsen

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Re: scud race / nanao ms9-29su missing a color
« Reply #41 on: November 18, 2018, 07:10:22 am »
HI

resistance across pins 9 and 10 is 1.9 ohm

Then it might still be light at the end at the tunnel

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Re: scud race / nanao ms9-29su missing a color
« Reply #42 on: November 18, 2018, 07:53:39 am »
there should be a diode on the main chassis on the heater circuit, test it one side out of circuit

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Re: scud race / nanao ms9-29su missing a color
« Reply #43 on: November 18, 2018, 10:30:05 am »
Hi

That must be D507.
One leg out and it tests fine.

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Re: scud race / nanao ms9-29su missing a color
« Reply #44 on: November 18, 2018, 10:54:00 am »
Hi

I might have found something.
I have tested the B+ at testpoint TP2

When i power it on the volt is at 117,7V

When i hear a faint click.. the volt raises to 138V

It my issue something with a protection who is kicking in?

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Re: scud race / nanao ms9-29su missing a color
« Reply #45 on: November 18, 2018, 01:37:54 pm »
it would be d955 on same line as the 1r5 resistor

that is in shutdown after the click, that can be caused by many things

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Re: scud race / nanao ms9-29su missing a color
« Reply #46 on: November 18, 2018, 02:05:40 pm »
Whau grantspain... you are spot on again  :applaud:

The diode d955 is dead!
I need to find  a replacment.
I have some diodes..

I think the type is B83004 if i google it an Equivalent is  NTE586 40V 3A
I have some N5408,N4001 can i use one of them?
 
N5408is 100V 1A
N4001 is 1000V 3A
« Last Edit: November 18, 2018, 02:42:22 pm by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #47 on: November 18, 2018, 03:18:45 pm »
40v 2a schottky barrier diode, i would stick with same type

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Re: scud race / nanao ms9-29su missing a color
« Reply #48 on: November 18, 2018, 04:29:07 pm »
Super, thanks i have order some.
Now just wait. :)

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Re: scud race / nanao ms9-29su missing a color
« Reply #49 on: November 19, 2018, 03:20:28 am »
Hi grantspain

Some really good news.  :applaud:

I have just swapped the chassis from the other working monitor, and I have not fried the tube when i swapped the wrong wires at the neck board.
The tube/screen is working fine - so now i just have to wait for the schottky diodes, and take it from there. :P

Thanks once again for your help!  ;D

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Re: scud race / nanao ms9-29su missing a color
« Reply #50 on: November 19, 2018, 04:48:07 am »
HI

Just thinking... while i am waiting for the spare part, would it be a good idea to do a cap kit on the chassis?
I think that it newer has been done.


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Re: scud race / nanao ms9-29su missing a color
« Reply #51 on: November 19, 2018, 04:53:35 am »
yes i would

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Re: scud race / nanao ms9-29su missing a color
« Reply #52 on: November 19, 2018, 08:16:42 am »
Hi

Phew - a lot of de-soldering and  soldering done now  :)
de-soldered one cap at the time, noted values and direction.
New cap in, noted direction, solder and marked it red for done....

I have changed the following CAP's
C102 1uf 50v
C107 22uf 50v
C201 47uf 16v
C202 47uf 16v
C203 47uf 16v
C211 2.2uf 50v
C212 2.2uf 50
C213 2.2uf 50v
C220 470uf 16v
C221 100uf 16v
C222 22uf 50v
C280 10uf 16v (remote board)
C402 470uf 16v
C406 1000uf 35v
C407 100uf 35v
C408 100uf 35v
C409 100uf 35v
C451 22uf 50v
C455 10uf 50v
C456 10uf 50v
C457 10uf 50v
C458 22uf 50v
C459 22uf 50v
C503 100uf 35v
C554 1uf 50v
C556 1uf 50v
C561 47uf 16v
C562 100uf 10v
C956 680uf 10v
C957 10uf 35v
C958 47uf 16v

Need to order:
C332 10uf 250v (neck board)
C513 10uf 250v
C515 100uf 160v
C951 180uf 100v
C952 220uf 100v
C953 47uf 160v
C954 680uf 35v
C955 180uf 25v

And see if i can find this C411 2.2uf 50v (bi polar cap)
« Last Edit: November 19, 2018, 08:20:24 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #53 on: November 19, 2018, 09:05:32 am »
C911?

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Re: scud race / nanao ms9-29su missing a color
« Reply #54 on: November 19, 2018, 09:40:25 am »
C911?

Oh.. big one 1000uf 200V-- so big that i missed that  :P

Yes i need to order that too :)

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Re: scud race / nanao ms9-29su missing a color
« Reply #55 on: November 19, 2018, 04:32:02 pm »
there is a np cap near the vertical ic

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Re: scud race / nanao ms9-29su missing a color
« Reply #56 on: November 19, 2018, 04:39:46 pm »
there is a np cap near the vertical ic

Hi :)

Do you mean C411?
2.2 uf 50V i have searched high and low for at bi polar cap but without any luck..
Correction - i have found them https://www.ebay.co.uk/itm/2-2uf-50v-105c-MDL-non-polarised-Bipolar-Capacitor-Size-13mmx26mm/301017752208


« Last Edit: November 19, 2018, 04:43:43 pm by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #57 on: December 20, 2018, 09:05:10 am »
Hi

Just an update
The d955 (NTE586) schottky barrier diode has arrived today.  ;D

I have also changed C411 (2.2uf 50V NP cap) - so nearly a complete cap kit is also done.

Just waiting for the last caps
C332 - 10uf 250V (neck)
C513 - 10uf 250V
C951 180uf 100V
C954 680uf 35V
c955 180 UF 25V

I will solder D955 in later today and see if i got picture...

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Re: scud race / nanao ms9-29su missing a color
« Reply #58 on: December 20, 2018, 12:10:20 pm »
Status - Help :)

I have mounted the d955 (NTE586) schottky barrier diode -there is some progress now the screen turn's on but with a vertical collapse.

But it only stays on for 5 to 10 sec then it gives some rapid crackling noise, then I turn of the power.

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Re: scud race / nanao ms9-29su missing a color
« Reply #59 on: December 20, 2018, 12:34:20 pm »
Is it the vertical IC that i need to replace?
the LA7837? - can this IC also cause rapid crackling noise??

I have order some LA7837 back in november (from china) just to have some spare parts...
hopefully they arrive soon :)

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Re: scud race / nanao ms9-29su missing a color
« Reply #60 on: December 21, 2018, 03:54:49 am »
Is R425 good? Do you have 12V on the leg closer to the vertical IC? Is the yoke connector in good condition? I noticed the contacts look a bit charred on pretty much all these chassis as if the connector was kind of weak for the current that goes through it.

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Re: scud race / nanao ms9-29su missing a color
« Reply #61 on: December 21, 2018, 04:29:07 am »
Hi

Thanks for the input princess prin prin  :cheers:
I will check that tonight and let you know :)

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Re: scud race / nanao ms9-29su missing a color
« Reply #62 on: December 21, 2018, 02:56:26 pm »
Hi princess prin prin

Status

1. R425 is good, i pulled it out, and it reads 100ohm (brown-black-brown-gold)
2. The vertical IC has 11.58V at leg1. When the monitor shuts off the volt lowers to about 9V
3. The reason for the rapid crackling noise when the monitor shuts off, where my fault - i had forgot to add the ground wire to the neckboard. Now when the wire is on the monitor does not make that sound.

The monitor is still in vertical collapse - it turns on with a vertical collapse line for 1-2 sec then it turns off by it self.
I have tested the volt at TP2 - when the monitor is on with the collapse line it is 117V - when it shuts off the volt raises to 138V

So what do my tests conclude? dead vertical IC? and the monitor goes to hw shutdown or something.. . ;D

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Re: scud race / nanao ms9-29su missing a color
« Reply #63 on: December 21, 2018, 06:27:25 pm »
either bad psu caps or bad ic or both

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Re: scud race / nanao ms9-29su missing a color
« Reply #64 on: December 22, 2018, 02:02:37 pm »
Hi grantspain

Ok thanks. I am still missing some caps in the psu part.
I will keep you updated when i get my last parts.
Merry Christmas to you  :cheers:



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Re: scud race / nanao ms9-29su missing a color
« Reply #65 on: December 28, 2018, 09:15:40 am »
Hi 

An update

I have now changed the Vertical IC (LA7837) and also the C954 (680uf 35V)
Still vertical collapse, and the monitor shuts off  :cry:

I am still waiting for the last caps, then i have done a complete cap kit.
So i am hoping that the last caps fixes it, I had hoped that the new IC had fixed it...

C332 10uf 250V (neck board)
c513 10uf 250v
c951 180uf 100v
c955 180uf 25v
« Last Edit: January 02, 2019, 03:32:29 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #66 on: January 02, 2019, 05:21:49 pm »
Hi

Also just a small update - still chasing the vertical collapse /  shutdown issue while waiting for the last caps...

I assume that the issue with the vertical collapse is in the 4xx section of the board, so I have pulled some resistors to check them out of circut
R425 100 ohm resistor - tests OK
R457 220 ohm resistor - tests OK
D403 tests OK
R428 560 ohm resistor - tests OK
The resistor below the vertical connector 6.8k ohm - tests OK

I have read online that the small c452 a small surface mount cap could case some vertical issues.
I pulled it out but where unable to test it with my LCR tester and multimeter, so i swapped it put with a small ceramic  104 (0.1uf) cap not surface mounted.

So i will try to test tomorrow if there is any positive progress and let you know
« Last Edit: January 02, 2019, 05:27:06 pm by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #67 on: January 03, 2019, 03:54:01 am »
Hi

A bit sucess!!!!  :applaud:

Now i got a picture - but it is like this now - so somehow the change of C452 has been positive - i hope that it is the right value i have put in 104 (0.1uf) ceramic
It is blurry and not filling the screen...

So now to some wise words from the arcaade reapair gods - what do i check/do next now?

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Re: scud race / nanao ms9-29su missing a color
« Reply #68 on: January 03, 2019, 03:59:45 am »
A better picture of what i see now.
Its still missing the green color and it seems that the picture is double

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Re: scud race / nanao ms9-29su missing a color
« Reply #69 on: January 03, 2019, 04:52:35 am »
HI

I tip from grantspain - swap the neck boards  ;D
I did - an from that, the green issue is on the neckboard, not on the chassis.

Now i have a lot of green and still shrunken image.
So i have to find the green transistor on the neckboard ( I thnik that i allready have some new), and might change the LA7837 one more time - or just wait for my last PSU caps.

« Last Edit: January 03, 2019, 04:54:50 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #70 on: January 03, 2019, 05:27:40 am »
Hi

Does someone know what resistors, zener and transistor go to witch color?
Just need to find the green one

And another thing.. the C452 is an 104 (0.1uf) ceramic the right one?
I just have fund another post (https://forum.arcadeotaku.com/viewtopic.php?f=4&t=36350&start=20) Where i can see a picture who shows an 103J (0.01 uf)
So do i have the wrong one?
« Last Edit: January 03, 2019, 05:37:48 am by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #71 on: January 03, 2019, 12:56:46 pm »
Hi

An update C452 is an 104 (0.1uf) ceramic the right one

Trying to find the missing green :)

Could not figure out what transistor that drives the green, so i changed them all, also the 16V zener diodes.
(Tested all the transistors in my china tester - they tested all out fine but changed them anyway)

Q302 and ZD201
Q312 and ZD321
Q322 and ZD311

also tested the resistor's to the crt tube connector  in circut (270 ohm)
R317 - 281 ohm
R327 - 265 ohm
R307 - 277 ohm

« Last Edit: January 03, 2019, 01:06:21 pm by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #72 on: January 03, 2019, 01:30:04 pm »
Update

Still no green - what do i overlook at the neckboard  :badmood:

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Re: scud race / nanao ms9-29su missing a color
« Reply #73 on: January 03, 2019, 01:48:18 pm »
31X are the green components.

Just to be sure, you do have 24v on pin 8 of the vertical IC don't you?

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Re: scud race / nanao ms9-29su missing a color
« Reply #74 on: January 03, 2019, 02:02:48 pm »
Hi

Thanks for the info regarding green components :)

Chasing the green color:

I have tested the following neckboard components in circut
D311 - OK
D312 - OK
D313 - OK
D314 - OK
R316 (100 ohm) OK
R311 (120 ohm) OK
R312 (33 ohm) OK
R314 (18 ohm) OK
R315 (5.5 ohm) OK

R310 reads 0.466k ohm also when pulled out - I can read the colors but i THINK it is (yellow-blue-red-gold) 4.6k ohm
R317 reads 280 ohm also when pulled out - i think that the color is (red - violet - brown - gold) 280 ohm

So I have tested all the 31X parts, and still not found the faulty component  :cry:

I have NOT tested the Q1X's but I am unable to read the part number's - so if any can tell me what they are it would be super :)
My best guess to the Q1X parts are 2SC4218 and 2SC1624
Must the transistors be exactly the same, or is it OK to replace them with some with the same values?

---
Chasing the 25V at  vertical IC:
Only 22.8V at pin8 to low.... so I have pulled out and tested the last caps that i not have changed in the PSU section
C955 (180uf 25V) Reads: 186uf ESR 0.54 ohm vloss 1.3%
C951 (180uf 100V)Reads: 183uf ESR 0.00 ohm vloss 1.0%

Can it be low due to my last two caps?

Need the experts advice...  :applaud:
« Last Edit: January 03, 2019, 05:43:24 pm by perjmolsen »

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Re: scud race / nanao ms9-29su missing a color
« Reply #75 on: January 03, 2019, 05:58:45 pm »
r310  470r
r317  270r
both yours are reading ok

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Re: scud race / nanao ms9-29su missing a color
« Reply #76 on: January 04, 2019, 04:29:40 am »
Focus on the transistors.

The 24v supply is OK even if it's 23v.
« Last Edit: January 04, 2019, 06:29:18 am by princess prin prin »

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Re: scud race / nanao ms9-29su missing a color
« Reply #77 on: January 04, 2019, 05:39:05 am »
Hi

I my head I had to regroup in what i have changed and what i have tested  :)
So I have made an excel repair log.

It gives me a better overview of what i have changed, and what the changed parts did of progress
I will keep it updated, hopefully someone can also make use of it.

https://www.dropbox.com/s/ygvt1gwbpzp12su/NANO%20MS9-29SU%20repair%20log.xlsx?dl=0

And it gives me the next step in the green color issue at my neck board -
It seems that i need to test  Q313 and Q314

The 25V issue at pin8 at the vertical ic issue:
I have found a PSU chart, and if i get it right, the 25V go thru D953->C408 -> C954 all those caps I allready have replaced - but i might need to check them again.
https://www.dropbox.com/s/w5lyb26ra2j53p7/MS9-29SU%20PSU.pdf?dl=0

To the experts - let me know if I am missing something :)
« Last Edit: January 04, 2019, 06:50:13 am by perjmolsen »

perjmolsen

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Re: scud race / nanao ms9-29su missing a color
« Reply #78 on: January 04, 2019, 06:47:42 am »
Focus on the transistors.

The 24v supply is OK even if it's 23v.

OK super! thanks - always good with some expert advice

princess prin prin

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Re: scud race / nanao ms9-29su missing a color
« Reply #79 on: January 04, 2019, 07:06:49 am »
Does the vertical size limit pot make the picture any bigger?