Problems with Golden Tee 2005 monitor ([s]WG 27K7501[/s])(WG27k7502)

[GA-GEO]

Hello all,

I just picked up a Golden Tee 2005 and the monitor is having a few problems.  The image seems washed out, but playable for about 9 holes.  Then everything gets very blurred together and a vertical collapse happens (horizontal line).  I did notice that the marquee flickers randomly also.  I'm going to do a cap kit on it, but if the vertical IC was bad wouldn't it just collapse from the start?

[lilshawn]

it could be going...as it heats up it faults. not as common as just failing but does happen.

the marquee is just a bad bulb/starter. replace them both. leaving it the way it is is bad for the ballast transformer inside the light housing.

after you cap everything check your B+ (at TP202 or at L100 it should be 117 volts DC) and make sure it's not too high. putting new caps in often makes the voltage shoot up because of the load of the dying caps. you may need to turn it down.

http://www.wellsgardner.com/pdf/Service/K7500.pdf

[GA-GEO]

Thanks for the quick reply lilshawn.  I have to pick up an vertical deflection IC (TDA1771 I think) and a cap kit.  I just confirmed that its a K7502 not a 501 chassis, any idea on the differences?  I know Zanen and Twisted quarter sell cap kits but both list a generic 7500 series, I hope this will cover most of the caps.

[lilshawn]

the whole 7500 series was damn near identical. The only real differences were that there was one particular 7500 that could be switched between 15k and 25k (basically the same as a K7400 or U5000) while most were locked to 25k.

the 7500 kit will fit no problem.

your vertical could be a bad U701 too as well.

things that can cause horizontal line:

D302, R402, U601, U701, R303, T700, D603  R627, C610, C603

[GA-GEO]

A big thanks for those references.  I'll start with a cap kit and u601 and go from there.

[GA-GEO]

I see on my board that cap C729 isn't there.  The holes are soldered over, on purpose it looks like.  Any idea what this cap is for and why there's not one there?  The kit I got from Zanen has one in it.

[lilshawn]

if it originally wasn't there, don't bother.

they do all sorts of changes and revisions and fixes to the boards as they get produced.

sometimes they find they don't need a part so they take it out. sometimes they need an extra cap here or there.

i'd have to look at a schematic, but i'll bet they found there was another cap further down the line performing the same function. (no sense having 2 filter caps on the same supply line)

i've seen lots of empty spaces in power supplies where they will have spots for 3 or 4 caps but only have 2 or 3 filled. they just have it for "part availability"

IE: they have 2 1500uf caps (3000uf total) with 1 empty space...if they run out of 1500uf caps, they can put 3 1000uf caps instead.

there's al sorts of reasons for missing parts. Not a big deal. If it wasn't there to begin with...don't worry.

[GA-GEO]

Cool, thanks man.  I'm in the process of replacing the caps now.  I just found a bad one.  This hobby will drive you crazy at times. 

[GA-GEO]

Zanan gave me two 1000uf 35v caps to replace two 470uf 35v ones. Is this ok?  I thought that you could go higher on the v but the uf had to be the same.

[lilshawn]

upping the uF is okay if it's just used for power filtering. caps used for tuning or timing not so much. They need to be spot on otherwise it throws out the whole system. it's okay to go up a bit (in this case to the next common E6 value of 1000uf) It should do just fine. it just help provides a little more reserve current when needed.

As long as you don't go crazy upcapping power filter caps to huge amounts...the required current to charge that cap up to it's specified uF can damage regulators, especially if it's supposed to have something way smaller...as capacitors when not charged with energy act as a dead short on the power supply until they get filled with power, where they become "invisible" (no resistance)

I have no qualms replacing a power filter cap that is normally 470 with a 1000, but I wouldn't go so high as 1500 or 2000.

[GA-GEO]

Finished and now its worse, lol.  Now upon startup i get a horizontal line immediately, unlike before it took a few minutes to collapse.  I have another IC to replace, ill see if that helps.

[lilshawn]

if you did U601 and its still doing it replace U701

also check the solder joints around U601/701 make sure there isn't anything bridging (solder splashes pins touching etc.) it's easy enough to do.

also make sure you clean the flux off the board, it's mildly corrosive and slightly conductive (depending on manufacturer) can play all sorts of havoc now and later down the road.

[ed12]

hi
in them chassic it's alway's best,but not really nessary to do replace
u601 and 701 clean flux,do cap's
chk power supply etc
that is what i do when i do a cap job on them anyway
as a rule there back in the feild a day ltr
>heat-run< for 24-7
bing bang gone

ed

[GA-GEO]

We have Success!!!!! Thanks for the tip on the sloppy soldering, i re-soldered and that did the trick.  The only problem now is a weird effect on both sides of the screen, i think it was there beforehand too.  It's like a magnet is being held next to the sides, or like striations of a muscle, purple-ish looking:

http://imageshack.us/photo/my-images/38/20121023174111.jpg/

http://imageshack.us/photo/my-images/820/20121023174023.jpg/

The image doesnt seen very sharp either, will any other controls besides the remote board fix that?

Thanks again for your help lilshawn.

[lilshawn]

on the high voltage transformer there is a focus adjustment.



one adjusts the screen volts, the other, the focus.

as far as your discoloration, i can't really tell from your picture but i think your talking about the funny lines?



it's called a "moire pattern" it's caused when patterns don't quite line up. on a video display it can be caused by lots of things. Adjusting your focus may fix this...or it could be something like a slight magnetic field from a fluorescent light ballast is causing the electron beam to wobble slightly through it's magnetic field. as it warms up it may fix itself.  could be lots of things. does moving or turning the cabinet make it change at all?