Author Topic: Newbie with monitor problems. (Read 6243 times)

Funnel · « **on:** December 17, 2010, 11:33:10 am »

What's up guys! I recently got a free candy cab with a 4 slot neo geo board and 2 cartridges. The previous owner told me to check the monitor, which I did. When I plug the monitor it makes a hissing sound. I really don't know what to do. I know how to discharge a monitor and I have tools to do that so can you help me? Here's some pics of the monitor:

codecrank · « **Reply #1 on:** December 26, 2010, 02:34:34 pm »

Free Candy Cab ?

Some people have all the luck

I am looking to buy one for a reasonable price but can't .... monitor or not.

I'm no monitor repair expert, but high pitched noises are typically associated with a bad FBT.

Funnel · « **Reply #2 on:** December 27, 2010, 01:38:31 pm »

Hey Codecracker! Yeah I guess I got kinda lucky hehehe but I'm still stucked at the monitor. If I'm going to replace the flyback, do I need to look for a specific model or number?

grantspain · « **Reply #3 on:** December 27, 2010, 01:44:42 pm »

where is the hissing coming from,normally its from the anode cap which denotes the monitor being damp
make sure the neck is not cracked
is it actually coming on at all,do you get an orange glow from the heaters in the neck card,do you get static on the screen

Funnel · « **Reply #4 on:** December 27, 2010, 01:57:08 pm »

The neck is not cracked that I can see, the monitor sort of turns on with little static and yes the neck has some glow.

grantspain · « **Reply #5 on:** December 27, 2010, 02:15:08 pm »

sounds like just a damp crt then,have you tried turning up the screen volts to see if you get a picture

Funnel · « **Reply #6 on:** December 27, 2010, 02:39:07 pm »

Where do I adjust that???

grantspain · « **Reply #7 on:** December 27, 2010, 02:58:51 pm »

Quote from: Funnel on December 27, 2010, 02:39:07 pm

Where do I adjust that???

on the flyback transformer next to the focus
adjust slowly clockwise to see if you get a white raster(if no video signal connected)

Funnel · « **Reply #8 on:** December 27, 2010, 03:13:21 pm »

Are those the ones that look like screws?

grantspain · « **Reply #9 on:** December 27, 2010, 03:14:09 pm »

Quote from: Funnel on December 27, 2010, 03:13:21 pm

Are those the ones that look like screws?

i guess you could describe them as such

Funnel · « **Reply #10 on:** December 27, 2010, 03:18:01 pm »

On the flyback there are 2 of them. I tried adjusting them both and nothing... thoughts?

Funnel · « **Reply #11 on:** December 27, 2010, 03:34:34 pm »

Success!! Well kinda heh. I kept adjusting the flyback and now the monitor has a white picture with horizontal lines. Any ideas?

grantspain · « **Reply #12 on:** December 27, 2010, 06:00:37 pm »

no video signal,the hissing is probably sync whistle due to the fact there is no sync
now you need to check your power supply is functioning correctly using a multimeter to read the +5 and +12

Funnel · « **Reply #13 on:** December 27, 2010, 07:46:14 pm »

Noob question: Where do I check the 5+ and 12+?

grantspain · « **Reply #14 on:** December 28, 2010, 07:43:57 am »

Quote from: Funnel on December 27, 2010, 07:46:14 pm

Noob question: Where do I check the 5+ and 12+?

set meter to dc volts 20v range
black probe to pin 1 of the jamma edge connector and red probe to pin 4
should read 5.05 to 5.10 volts

Funnel · « **Reply #15 on:** December 28, 2010, 09:36:10 pm »

@grantspain I'll check it first thing tomorrow, a buddy is going to lend me his multimeter. Please don't back away from this thread, you're my only help!

grantspain · « **Reply #16 on:** December 29, 2010, 02:05:58 pm »

a simple fault finding process for vids is to power on and press service switch or insert a coin then press start,if you get sounds then likely the monitor is faulty if not then likely power supply or game board
then you go onto reading psu voltages and turning up the screen volts to id exactly where the fault lies-should take less than 1 minute to fault find a vid
been doing this process since i started working on amusement machines way back in 86

Funnel · « **Reply #17 on:** December 29, 2010, 03:21:52 pm »

grantspain I checked the pins on the monitor chasis and on the multimeter it read .05. Or am I doing it wrong?

grantspain · « **Reply #18 on:** December 29, 2010, 03:44:58 pm »

Quote from: Funnel on December 29, 2010, 03:21:52 pm

grantspain I checked the pins on the monitor chasis and on the multimeter it read .05. Or am I doing it wrong?

you need to read at the jamma edge connector-where the game board plugs in
pins 1 and 4 you want

Funnel · « **Reply #19 on:** December 29, 2010, 06:49:30 pm »

grant: On a sidenote, we checked the pins on the jamma connector and traced them to the monitor chassis and saw that there wasn't any cable connected on pin 1. There are 6 pins right?

grantspain · « **Reply #20 on:** December 30, 2010, 07:35:54 am »

i am not sure what you are doing,there is no reason to read the video signal lines.
there are normally 5 pins for video input red/green/blue/video ground/sync

Funnel · « **Reply #21 on:** December 30, 2010, 12:48:04 pm »

Oh now I get it, sorry I was measuring the wrong pins! I'll get right on it as soon as my buddy comes over.

Funnel · « **Reply #22 on:** January 04, 2011, 02:37:14 pm »

grantspain: Happy New Year! Sorry I took a while to respond but the thing is that my buddy still has the multimeter and I haven't heard from him in a while. Should I check on something else for the time being??

grantspain · « **Reply #23 on:** January 04, 2011, 04:39:55 pm »

insert a coin or press the credit button-do you get any game sounds?

Funnel · « **Reply #24 on:** January 04, 2011, 04:48:41 pm »

Loud buzz coming out of the speakers!

grantspain · « **Reply #25 on:** January 04, 2011, 05:33:38 pm »

Quote from: Funnel on January 04, 2011, 04:48:41 pm

Loud buzz coming out of the speakers!

sounds like psu to me

Funnel · « **Reply #26 on:** January 04, 2011, 05:43:58 pm »

Yeah but the monitor isn't plugged to the psu... and the monitor is still showing the horizontal lines, is that ok??

grantspain · « **Reply #27 on:** January 04, 2011, 06:00:05 pm »

Quote from: Funnel on January 04, 2011, 05:43:58 pm

Yeah but the monitor isn't plugged to the psu... and the monitor is still showing the horizontal lines, is that ok??

the psu supplies the voltages to the game board and few other optional items
the monitor is powered either via a stepdown/isolation transformer or direct from the mains depending on type
if the monitor powers on but you only get a whitish screen with the screen volts turned up then 99.9% of the time it means the game board is not outputting a video signal
for the game board not to output a video signal most of the time it means the power supply that runs the game board is knackered-also a knackered game board will cause these issues
impossible to prove unless you have a multimeter

those lines you see are called flyback lines

it should be made law that all video machine owners buy a multimeter

Funnel · « **Reply #28 on:** January 04, 2011, 06:15:31 pm »

Hahahaha the multimeter law! So... those flyback lines are normal?? Trying to get a multimeter, had the chance to buy one a couple weeks ago but forgot... is there anything else I can do?

grantspain · « **Reply #29 on:** January 04, 2011, 06:31:48 pm »

Quote from: Funnel on January 04, 2011, 06:15:31 pm

Hahahaha the multimeter law! So... those flyback lines are normal?? Trying to get a multimeter, had the chance to buy one a couple weeks ago but forgot... is there anything else I can do?

feeling brave?
get a 12v halogen bulb and stick across pins1 and 3 on the jamma connector
disconnect the game board first

Funnel · « **Reply #30 on:** January 04, 2011, 06:45:18 pm »

Where do I get one of those? Will my coin door bulb work?

grantspain · « **Reply #31 on:** January 04, 2011, 06:51:33 pm »

Quote from: Funnel on January 04, 2011, 06:45:18 pm

Where do I get one of those? Will my coin door bulb work?

yep but its better you got a multimeter,they cost very little and can be bought anywhere these days

Funnel · « **Reply #32 on:** January 04, 2011, 06:59:09 pm »

I know man, and I need one too! I'm gonna try the bulb thing.

Funnel · « **Reply #33 on:** January 04, 2011, 07:14:30 pm »

Did what you sai, the coin door light bulb turned on. Yay?

grantspain · « **Reply #34 on:** January 05, 2011, 05:22:00 am »

well that probably proves you have +5 volts but proves little else
you will need that multimeter to read +12 as well
do you have a spare game board you could try?
also some photos of the wiring from monitor to game board etc would help

Funnel · « **Reply #35 on:** January 06, 2011, 02:24:47 pm »

grantspain I finally got a multimeter and measured the +5 and +12 pins. One measured 5.08 and the other measured 11.98. Ideas???

grantspain · « **Reply #36 on:** January 06, 2011, 05:41:59 pm »

the voltages are correct
try a different game board,remember neo 4 slot are not jamma so any jamma board you test make sure you remove the speaker wires first

Funnel · « **Reply #37 on:** January 06, 2011, 06:59:16 pm »

Hmmmm that may be a little difficult cause the only gameboard I have is the 4 slot. But I may be able to talk with a friend to let me try his gameboard. I'll keep you posted grant, thanks for all the help so far dude!

Funnel · « **Reply #38 on:** January 26, 2011, 04:41:57 pm »

grantspain Have you ever worked with a Toei chassis?

I'm trying to find the monitor schematics and I can't seem to find them. I need to know what pins on the chassis are vgreen, vred, vsync, vblue and gnd. The chassis has 6 pins. Help this fellow arcader people!!!

grantspain · « **Reply #39 on:** January 26, 2011, 05:56:21 pm »

what model toei?
also it should be obvious what does what by looking on the solder side


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