Nanao ms2931 remains black :(

For monitor related issues
User avatar
grantspain
Tech Head
Posts: 4823
Joined: August 17th, 2008, 4:23 pm
Location: down south

Re: Nanao ms2931 remains black :(

Post by grantspain »

i have 2 x 2931 here just sent it with same fault,i will get onto them next week but fet and hot are reading fine-there is a small custom module near the flyback and i think that may be the issue,like i said i won't know until i look at them correctly
User avatar
mufunyo
Posts: 648
Joined: August 21st, 2008, 12:26 am
Location: Eindhoven, NL
eBay: mufunyo
Initials: MUF

Re: Nanao ms2931 remains black :(

Post by mufunyo »

Rood wrote:In my case everything was cleaned and tested thoroughly by princessprinprin but the issue is somewhere in the power circuit.

Still not sure what it is and how to fix. Hope yours is a bit easier....
If it is the same issue as my 2930 which is currently being repaired by an expert then your tube neck is internally shorted/melted. There is a failure in the power circuit which causes voltage to go way too high, bypassing any safety mechanisms and killing the tube. My symptoms were exactly the same as yours. You can repair the chassis but you will need a new tube, and you should not connect the chassis to a working tube before you are 100% sure it's repaired.
Image
User avatar
Rood
Posts: 47
Joined: March 20th, 2014, 1:04 pm
Location: Netherlands
eBay: fredscape
Initials: RED
Contact:

Re: Nanao ms2931 remains black :(

Post by Rood »

I'll try not to think about that option too much because I'm already **** off enough. I only got about 2 hours worth of playtime since it arrived 2 months ago :(

Time for some meditation and mild praying that this will work out soon.
Super Nintendo, Sega Genesis, man when I was dead broke I couldn`t picture this ...

My Neo Games
lynyx77
Please Continue...
Posts: 7
Joined: November 22nd, 2015, 9:49 pm
Location: France/Paris

Re: Nanao ms2931 remains black :(

Post by lynyx77 »

grantspain wrote:i have 2 x 2931 here just sent it with same fault,i will get onto them next week but fet and hot are reading fine-there is a small custom module near the flyback and i think that may be the issue,like i said i won't know until i look at them correctly
Hi grantspain, did you find the issue?
User avatar
grantspain
Tech Head
Posts: 4823
Joined: August 17th, 2008, 4:23 pm
Location: down south

Re: Nanao ms2931 remains black :(

Post by grantspain »

not yet,i was waiting for very expensive transistors to arrive-i may get onto the chassis early next week
lynyx77
Please Continue...
Posts: 7
Joined: November 22nd, 2015, 9:49 pm
Location: France/Paris

Re: Nanao ms2931 remains black :(

Post by lynyx77 »

Ok thank you for your feedback , when you speaking about a custom module near the fly back do you speaking about the module IC (U901) M62281 ?
lynyx77
Please Continue...
Posts: 7
Joined: November 22nd, 2015, 9:49 pm
Location: France/Paris

Re: Nanao ms2931 remains black :(

Post by lynyx77 »

grantspain wrote:not yet,i was waiting for very expensive transistors to arrive-i may get onto the chassis early next week
Hello Grantspain, do you have an update?
Thank you
User avatar
grantspain
Tech Head
Posts: 4823
Joined: August 17th, 2008, 4:23 pm
Location: down south

Re: Nanao ms2931 remains black :(

Post by grantspain »

yeah mine was a faulty vertical deflection ic
lynyx77
Please Continue...
Posts: 7
Joined: November 22nd, 2015, 9:49 pm
Location: France/Paris

Re: Nanao ms2931 remains black :(

Post by lynyx77 »

Can tell me the Reference IC? does it was the LA7846?
How did you detect it was bad?
Tsar
Posts: 5
Joined: April 10th, 2016, 11:55 pm
Location: Sweden

Re: Nanao ms2931 remains black :(

Post by Tsar »

He replaced it with a good one =)
User avatar
Rood
Posts: 47
Joined: March 20th, 2014, 1:04 pm
Location: Netherlands
eBay: fredscape
Initials: RED
Contact:

Re: Nanao ms2931 remains black :(

Post by Rood »

Tsar wrote:He replaced it with a good one =)
LOL

on a more serious note: mine is still warped.
Mainly because I lost princesprinprin somewhere :(
hope everything is ok, anybody hear anything?
Super Nintendo, Sega Genesis, man when I was dead broke I couldn`t picture this ...

My Neo Games
lynyx77
Please Continue...
Posts: 7
Joined: November 22nd, 2015, 9:49 pm
Location: France/Paris

Re: Nanao ms2931 remains black :(

Post by lynyx77 »

Tsar wrote:He replaced it with a good one =)
Question was how to test it before to replace it
User avatar
grantspain
Tech Head
Posts: 4823
Joined: August 17th, 2008, 4:23 pm
Location: down south

Re: Nanao ms2931 remains black :(

Post by grantspain »

lynyx77 wrote:
Tsar wrote:He replaced it with a good one =)
Question was how to test it before to replace it
you can't as chassis shuts down as soon as it see's a fault on the vertical circuit
Post Reply