hentarex polo 25 installed but now what ?

[cadaverc]

Im new to the arcade hobby and ive done my first monitor swap, I have a MK1 cab it had a 19inch monitor and was able to get a 25inch hentarex polo for 65$ and did the swap, well i did a lot of reading on how to do this but i turned it on and all looks OK I guess but i cant get the screen to stop spinning up and sideways even adjusting the pots and the screen seems to stretch sideways ..than ill adjust for that and it just about fixes and than it starts again no matter what i do it wont hold or look right ...maybe i need to replace the pots ? sorry if i didn't give enough information ..but this is new to me. any help would be great

[grantspain]

make sure you have the connections into the video signal plug as follows
sync/not used/video ground/blue/green/red

i think either you have the sync and video ground reversed or you have connected sync to pin 2 which is vert sync(not used)

[cadaverc]

thanks for the info ...ill look at the wires for that tonight, I need to step away from the problem before i make it worse and come back with a fresh start.

[cadaverc]

thanks for your help I looked at what i did and read what you said it it kinda didn't jive with what i was saw so i unhooked one wire now i adjusted the pots and all looks good ...but now it will play and then the screen will go wierd and it will reboot to the ROM check  and then it wont play right after that until i restart the system ....well this time it rebooted 4 times and now is ok ..ill see if it restarts to the rom check .... thanks for your help .

[cadaverc]

well i played for like 3 min and it did that again..... I don't know what to do.

[cadaverc]

well ...if i turn off the game and then turn it back on in like 1 min after that I get a good game boot up and it plays ..but after time it will start to do the crazy stuff again .....urr wish i new more about this stuff to tell you what i think that it is but im more of a hard ware person not electrician

[grantspain]

post some photos of the screen when it goes wrong and also some pics of how you have the video signal plug wired

[cadaverc]

well i hope this works ..i haven't put a pic on a forum in a long time ....    that one is going in the monitor...

[cadaverc]

and this is the side going in the board.   as you can see i have the sync wire plugged in ....maybe that's the problem ?

[cadaverc]

this it the picture i get for about 5 min..

[cadaverc]

than it gets all weird.... and some times it will reboot ..but this time i just turned it off and turned it back on and all was fine for 2 min than it went back to doing this and turn off again ...than 2 min it did this ....  thanks for any of your input ...looks like a good monitor i hope just a few bugs to work out.

[grantspain]

strange,if it were a wrong cable then it would not sync even for a few seconds

have you tried a different game board yet?

[cadaverc]

I dont have a working jamma board... I have one that says to hold in the test button, and i do that and it says that the rom is bad or somthing like that.

[grantspain]

to me it looks like a game board fault
the picture is fine in the first photo so that proves all your connections are correct
there is graphic breakup and a double image in a few of the photos and the final photo has lost sync

if you could lay your hands on a very cheap test board then at least you could prove the monitor is ok

another thing to check would be the voltages to the jamma connector and a long shot make sure the marquee light is not flickering wildly

[cadaverc]

well i just played it again with my kids and i could see that the picture would kinda bounce if that means anything ...its not to bad and when i start up the machine the tube makes a wine sound and the tube sounds like a little crackle sound for a long time ..kinda like a plasma sphere but only in the tube not the board.

[cadaverc]

I think to be safe that I will buy a cap kit and all that I need for the monitor and redo what could fail .... because this cab will be my mame cab after i get all the hardware that I need ....I need a project for this winter and you will be seeing me around a little longer lol.... but ill try and read befor I post thanks guys

[cadaverc]

I went and bought a multimeter, it says  it will do 200mA max and 20A max ? and other readings  like temp  and so on ....sorry im kinda starting out new out of the gates on some of this stuff, thanks for sticking it out for my learning curve.

[grantspain]

any cheap multimeter will do for checking cab voltages

download a jamma pinout as a reference to your meter reading points

set you meter on 20vdc max range

black probe to pin 1
red probe to pin 4

should get around 5.00 to 5.20 volts DC

black probe to pin 1
red probe to pin 6

should get around 11.05 to 12.50 volts DC

If all that checks out fine then when the picture starts to breakdown first manipulate the video signal cable along all its connectors

[cadaverc]

I think all checks out as you said and when the screen went funny it still read the same ..... 1and4 is 5.07 and 1 and 6 was 12.80 but i didn't understand manipulating the video signal cable along all its connectors

[grantspain]

well thats proved you power is fine

by manipulating i mean wiggle the wires-just to prove there is not a bad connection

you can check for bad solder joints on the monitor by tapping the metal heat  shield of the monitor chassis with an insulated tool of some kind(not too hard though)

still without another game board to test its difficult to prove the exact problem

[cadaverc]

Im going to look over my connections tomorrow just to make sure I have what it needs to stay stable ..but I dont know if that will do me any good .....I plugged that wire back in on the pic that i showed and all was stable and didnt move and was stable ...more than any other time ...played if for about 30 min ...played 6 matches and some 2 player with my kids ...but when one of my kids started to bang hard on the buttons I think that it started to make the screen jump a little and then it went back to being weird...but the game was normal and playable but the screen was out of sync. Im stumped 

[Malenko]

where are you located?  Im sure one of us is nearby that can bring a jamma board over

[cadaverc]

I live in Milwaukie Oregom, I have one jamma board but it wont turn on and says that I half to hold in the test button and turn the power on that I did and it dose a few test and than says i have a bad eeprom ....the thing is how do i check witch one to replace it ? sorry if this is getting off topic.

[cadaverc]

I haven't done anything today and I wanted to just turn it on the way it is and see how long it will run without me pushing any buttons or joystick just for $hits and giggles and it lasted for 55 min. than it went funny ..but not the double screen just scrolling up and what seems a little sideways but when its scrolling up it looks blinking kinda lol. sorry ill get a vid if I can.

[cadaverc]

well I went to get the vid and I was lifting the glass out of the front so you could see all of the tube and the glass kinda hit the tube and it went normal .... so that tells me that something is wrong with the monitor ? or fly back ? or the connection to the fly back or that cable that can kill me that connect to the tube ?

[cadaverc]

lol ...hummm its been running fine on its own now ever since my last post

[grantspain]

you have a either a bad solder joint on the chassis,bad connection on the remote cable or video lead or a pot right on the edge of adjustment

still does not explain some of the screen shots you posted as they show graphic errors

[cadaverc]

I dont know if this is off topic but it may be related ...when I flipped a few dip switches one for blood one for low blows and the other for attraction sounds and started to play with my kids it started to make weird sounds and some would be just a little off like a delay ...ive just now reverted the sound back to see if its normal but its to late to check it out.. kids are in bed and the lady is watching TV. lol

[grantspain]

sound issues were common with copy boards
a photo of the game board will show whether its original or not.

[cadaverc]

this is the pic that you wanted I hope that you can see what you need ..if not I can take more and for the sound problem ..I put the sound setting back the way it was and all is normal

[grantspain]

nice original board set you have

[cadaverc]

OK so I guess my problem that I see now is that from the right upper corner it starts from that side to the left bottom corner the screen goes from bigger to smaller .... I see it also when I put in test mode and see the squares on the screen ..I have a few pots in the back of the neck but I don't think that will fix the problem. I could guessing but would rather ask...thanks guys

[grantspain]

post a photo of the test grid pattern
it sounds like linearity

[cadaverc]

so this is what the test screen looks like

[grantspain]

vertical linearity pot needs adjusting-RV102 infront of the tda1675 vert deflection ic on the main chassis(behind the control pcb)

[cadaverc]

I'll half to get a flash light and look at the numbers to see what your talking about... I see a few that I could turn but not sure witch one, and I haven't said yet but thanks for your help with this install and problem, I'm learning so much with your help and what I have read and watched about fixing arcade monitors, I know that I have a long ways to go till I get a good grasp of what some of you guys know.  THANKS