neo candy monitor woes.

max 330 megafartz · Mar 2, 2009

so friday night, all was well, getting drunk playing kof 03, then the screen quickly flashes white, about five minutes later another flash of white, and 3 minutes past that WHITE! then nothing. monitor is still powered, illuminated black with thin scan lines still flowing upwards through it, music and controls still responding from the neo geo mvs itself.
what the hell happened to my beautiful nanao monitor??? can i fix it?
HELP!

grantspain · Mar 3, 2009

sounds like your video signal is missing-could be gameboard or chassis problem
only way to prove it is check the wiring and try a different game board

max 330 megafartz · Mar 3, 2009

wheres tttooddy when you need him?? lol.

max 330 megafartz · Mar 5, 2009

so..... no one has ever had this problem? black illuminated screen with scan lines???

grantspain · Mar 5, 2009

yep i have had this problem many times,only been an arcade tech for 23 years-thats why i said what i did-you need to prove the video signal first otherwise you should be looking a bad solder joints on the monitor chassis or a problem with the contrast pot
i am not sure what chassis is in there but i would expect a nanao ms8-check the electrolitic cap on the neck card its a 10uf 250v of which i must add is thee most common fault on this age chassis as well as a bad crt socket connection

max 330 megafartz · Mar 5, 2009

would this have been replaced during cap kit? i performed a cap kit on this monitor about 2 years ago. i appreciate your input greatly, i just regret to say that while i have enough knowledge to install a cap kit, my knowledge is rather iffy beyond that point.

Hewitson · Mar 5, 2009

Well check the brand/style of the caps. Is the one on the neck board the same as the ones on the chassis?

Varaques · Mar 10, 2009

yes im having this same problem with my egret 29

ttooddddyy · Mar 10, 2009

If it is not predominantly one colour (R,G or B) it is not likely to be a video output problem. More likely a dry solder joint or broken track/loose connection somewhere effecting the three drives simultanously - what happens if you tap around the monitor chassis or flex the pcb ?

Usually if the electro on the crt base used to smooth the video output stages 180 volt rail (typically 10 uF 250 volts, as grantsprain said) has dried out it would result in low dc supply causing the brightness to increase.
I dont think that is the case. There should be around 150-160 volts on the red,green,blue output transistor collectors.
That electro would usually be replaced with a cap kit job.

It is possible that the game board is faulty and we are jumping to conclusions on the monitor - try another board in there before anything else.

Bottom line is if your not sure about the monitor and safety issues associated get your local TV repair guy to check it out - we are a long time dead.

max 330 megafartz · Mar 10, 2009

im familiar enough with electronics to know the safety issues so were good on that.
i went ahead and hooked my pgm 2 into the cab, and still no video showing, same exact results, so its definitely a monitor issue.

max 330 megafartz · Mar 11, 2009

i located the 10uf 250v cap on the neck chassis, and it was indeed replaced when i performed the cap kit 2 years ago. from looking around at all the caps i could see that i had replaced on the actual monitor pcb, and all the solder joints on the neck chassis, everything looks good. no bad solders, or blown capacitors or anything that stands out immediately as being damaged. everything still looks solid.
what is my next step now???

grantspain · Mar 11, 2009

whats worrying me is that it could be the custom ic that is basically the video decoder,if it is then there are no replacements although jomac repairs them

do you have a photo of you chassis or know the exact model number

max 330 megafartz · Mar 11, 2009

the neck chassis reads nanao 5C01804A1. if this isnt the correct number let me know and ill look elsewhere.

grantspain · Mar 11, 2009

try to id here
http://www.jomac.net.au/mon.htm

max 330 megafartz · Mar 12, 2009

i would have to say it is either identical or very very very similar to the MS8-26A 15-25 K.

grantspain · Mar 12, 2009

those chassis have the custom ic,i have an awful lot of ms8 monitors but i have never seen the custom ic fault in the flesh so i am not 100% sure if it is that causing the problem-but from my reckoning and reading the schematics it could be
someone that would know for certain is joey at jomac as he is recognised as the oracle of nanao monitors
i think you should email him with a description of what has happened as he will tell you straight away whether it is that ic
sorry i can't be of more help

Marshall · Mar 12, 2009

This issue seems to be on the IC chip. Many ms8 suffers from this, and no longer obtainable, very hard to come by here in my country nether, since nanao quit offering this CRT business. I know that in some day you'll meet the same ploblem on this chip sooner or later, so better hurry collecting same chassis. About 80% or more of what I handled met this issue :oh_no:

norton9478 · Mar 13, 2009

I still say better the Chasis than the Tube...

You can just buy a different Chassis right?

grantspain · Mar 13, 2009

norton9478 said:
I still say better the Chasis than the Tube...

You can just buy a different Chassis right?

you could fit another ms8 chassis but finding one will be difficult,you can also fit other make chassis but depends on the crt size and yoke readings

max 330 megafartz · Mar 16, 2009

so should i still try and see what jomac can offer as far as advise or parts, or should i be searching elsewhere for a chassis? this blows! i want my baby to be alive again

its a 25 inch monitor btw.

grantspain · Mar 16, 2009

the ms8 nanao 26" yokes are very special I was told so even if you find another ms8 chassis it will need to the 26" version-i think you should consider contacting jomac and getting this repaired by him

max 330 megafartz · Mar 16, 2009

i have contacted jomac. heres hoping he can help out. thanks for all the info so far guys.

neo candy monitor woes.

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