Recent monitor repairs...Kortek, Wells-Gardner, Ceronix, etc...(By belbenchtech)

[SAT (aka GANDHI)]

Too much repeat information...trying to catagorize information.

Mike><>



Kortek Monitors;

Problem; Horizontal goes out intermittently.
Solution; Resoldered CN201.

Problem; Horizontal Tare.
Solution; Repl. C123.

Problem; Blackout (flyback ticking).
Solution; Repl. Q402 (H.O.T.) & C421.

Problem; Blackout (board burnt under R126)
Solution; Repl. R126 & C126 (domed cap), powered up and R512 started glowing...checked circuit and Q501, Q502 both fried...Repl. R512, Q501, Q502, & C508...tested good.

Problem; No dynamic focus.
Solution; Repl. C420.

Problem; Pincushion problem.
Solution; Adjusted VR403.

Problem; Won't power up.
Solution; Repl. Q402 & C421.

Problem; No blue.
Solution; Resoldered CN201.

Problem; Went blank.
Solution; Repl. Q402, C421, C123, R123, & R125.

Problem; Monitor won't come up.
Solution; Repl. flyback XFMR.

Problem; Dark stripes on left side.
Solution; Repl. D904 on dynamic focus bd.

Problem; Flyback pulsing.
Solution; Repl. flyback XFMR.

Problem; Monitor won't adjust, picture too wide.
Solution; Repl. C420 (dynamic focus bd.).

Problem; Pincushion.
Solution; Repl. dynamic focus bd.

Problem; Competition stripes on left side of monitor.
Solution; Repl. dynamic focus bd. (usual repair D904 on DFB...component out of stock).

Problem; Blackout.
Solution; Repl. D111, C126, & C122.

Problem; Touch screen error.
Solution; Repl. U10 (ILQ2) on touch screen control bd.

Problem; Intermittent Horizontal compression.
Solution; Resoldered several cold solder joints (look for dull looking solder).

Problem; Bad won't come up.
Solution; Repl. C126 & C408.

Problem; Touch screen not lining up.
Solution; Calibrated touch screen & tested good.

Problem; Vertical "jitter" (screen "shakes").
Solution; Repl. C408.

Problem; Touch screen not working.
Solution; Repl. electrolytic capacitors & U2 on touch screen control bd.

Problem; Screen strobes.
Solution; Repl. C406, C407, & C408.

Problem; Monitor was found black.
Solution; Repl. flyback XFMR.

Problem; Intermittent blackout.
Solution; Repl. neck bd.

Problem; touch screen bad, smoke coming from back?
Solution; (Multi. prob.) Repl. R126, R512, Q501, Q502, & IC501.

Problem; Went black.
Solution; Repl. dynamic focus bd. & IC401.

Problem; No color, gives you a migraine...
Solution; Restore & rejuvinate (R/R)...red gun won't last long.

Problem; Went dark, smelled burnt.
Solution; Repl. Dynamic focus bd. (D904 fried), C418, C423, IC401 & tested.

*NOTE* Though not stated, all repaired monitors are throughly tested before restocked.

[SAT (aka GANDHI)]

Looks like this is going to work...Kristel & Wells-Gardner Monitors...

Mike><>



Kristel Monitors;

Problem; Blackout.
Solution; Removed nut from main board & repl. fuse.

Problem; Horizontal foldover.
Solution: Adjusted VR602.

Problem; Sounds like power supply is arcing.
Solution; Repl. D502 (BA159=NTE558...subsistute 1N407=NTE125).

Problem; Went blank.
Solution; Repl. Q602 (H.O.T.).

Problem; Picture shakes.
Solution; Repl. C609.

Problem; Blackout.
Solution; Repl. IC801 & IC201 (bad auto bias ckt.).

Problem; Blackout.
Solution; Plugged in neck board.

Problem; Picture out of wack.
Solution; Adjusted VR304 (pincushion pot).

Problem; Does not work.
Solution; (multi. prob.) Repl. Q501, D508, C521, Q602, C609, & F501.

Problem; Vertical jitter.
Solution; Repl. C313, C311, C310, & C331.

Problem; High speed wobble (screen shakes).
Solution; Repl. C609.

Problem; Dim picture.
Solution; Repl. C524, C525, & R/R.

Problem; Dark screen.
Solution; Repl. C525, C921 & R/R.



Wells-Gardner Monitors;

Problem; Screen went white.
Solution; Resoldered front leg on bright pot...tested good.

Problem; Won't come up.
Solution; Repl. C108 & C110 on power supply.

Problem; Smoked cap.
Solution; Repl. C723.

Problem; Blackout.
Solution; Repl. electrolytic caps in power supply.

Problem; Blackout (smoked).
Solution; Repl. C723.

Problem; Blackout.
Solution; Repl. C117 on power supply.

Problem; Horizontal tare.
Solution; Repl. electrolytic caps on power supply.

Problem; Bad monitor, all white & staticy.
Solution; Same as above (S.A.A.).

Problem; Bad monitor went blank.
Solution; Repl. Q701 (H.O.T.).

[SAT (aka GANDHI)]

Ceronix, Tovis, & one lonely Tatung Monitor...



Ceronix Monitors;  (see below for Ceronix troubleshooting guide)


Problem; Blackout.
Solution; Repl. 127 (MPSA64 PNP xistor) & 115 (power supply IC).

Problem; Dark screen.
Solution; Repl. 036 (MPSA64) & 071 (PN2222A NPN xistor) both part of beam current limit ckt.

Problem; Dark at edges of screen.
Solution; Restored/rejuvinated (R/R) & tested.

Problem; Smoked when powered up.
Solution; Repl. 276 (resistor), 277 (resistor), 278 (resistor), 210 (LM393N IC), 355 (LM339 IC), & repaired traces.

Problem; Screen strobes.
Solution; Repl. PRA "I".

Problem; Monitor black.
Solution; Repl. 377 (LA7838 Vertical deflection IC).

Problem; Monitor off shelf, did not come up. (Aristocrat)
Solution; NPF---*NOTE* These monitors are famous (infamous) for the connector bending back, thus not making good connection with the machine...the plug should be visually checked to make sure the mounting bracket is at 90 degrees!!!

Problem; Blackout.
Solution; Repl. 115 (power supply IC).

Problem; Blackout.
Solution; Repl. 115, 440A (diode), & 460 (IRF520 MOSFET).

Problem; Blackout.
Solution; Repl. 136 (2SK1446LS MOSFET), 440 (diode), & 460 (S.A.A.).

Problem; Bad monitor (Aristocrat Monitor).
Solution; NPF-bent connector bracket on monitor to conform to game connector.

Problem; Center raster washed out (center screen distortion).
Solution; Repl. 182 (220uF, 100V +/- cap).

Problem; Power supply churping.
Solution; Repl. isolation XFMR.

Problem; Blackout.
Solution; Repl. 468 (24V relay)

Problem; Blackout.
Solution; Repl. 927 (CA3224E Auto Bias IC).

Problem; Blackout.
Solution; Repaired ISO power supply, repl. 181 (160V zener diode), 927 (S.A.A.), & fuse.

Problem; Bad.
Solution; Repl. 468 (24V relay, part od degausing ckt.).

Problem; Has green bar down center of the screen (or skunk monitor...white center, black sides).
Solution; Repl. 182 (220uF, 100V +/- cap.).

Problem; Blackout on test station.
Solution; Repl. flyback XFMR (arcing under the board).

Problem; Blackout.
Solution; Repl. 115 (P/S IC), 337 (2SC4159E NPN xistor), 033 (LM324 OP Amp IC), & installed jumper from 019 to ground.

Problem; Shows retrace lines.
Solution; Repl. 415 (Horizontal control IC).



Tovis Monitors;


Problem; Monitor dark
Solution; Repl. neck bd.

Problem; Screen black, no power.
Solution; Repl. flyback XFMR.

Problem; Blackout.
Solution; Same as above (S.A.A.).

Problem; Blackout.
Solution; Repl. C511.

Problem; Blackout.
Solution; Repl. main bridge rectifier.



The lone Tatung;

Problem; Monitor black.
Solution; Repl. C331.

[SAT (aka GANDHI)]

Tovis schematic...see attachment...

[SAT (aka GANDHI)]

Kortek 1982F schematic...see attachment...

[SAT (aka GANDHI)]

Some of the many Kortek schematics...

[SAT (aka GANDHI)]

A little more info on Kortek monitors, from Delphi forums...

Mike><>


I got this information from Casino Tech. They are the authorized service for KORTEK. When you loose H-synk, when the screen goes dim or when the monitor blanks out, replace this group of caps. Some of these caps have different ratings than what your taking out. TRUST ME! You'll thank me for this.

C107 - 47uf, 50v

C108 - 1uf, 50v

C123 - 1000uf, 16v

C126 - 47uf, 16v

C408 - 22uf, 160v

C421 - 10uf, 160v (always replace this if you replace the H.O.T.)

C506 - 47uf, 50v

C508 - 100uf, 50v

At first I would test all of these caps but they always failed 10% tolerance. replacing these is the first thing I do. It has saved me a lot of time and troubleshooting. The H.O.T is usually the next thing to go so I replace it with this set.

[SAT (aka GANDHI)]

(written by kforeman)

just a quick note:

the 1703 and the 1903 are almost the same.  usually the symptoms and repairs are identical yes

the 1403 is a little different, but has very close to the same component locations so troubleshooting is a matter of checking the same area of the board as on the 1703 or 1903. propeller

[SAT (aka GANDHI)]

A few problem monitors I came across in the last few months...

Kortek KT1703N
     Problem; Takes a long time to come on.
     Solution; Repl. IC101 & tested.

     Problem; Screen won't center.
     Solution; Repl. C420 & tested.

Ceronix
     Problem; Blackout (keeps blowing H.O.T.s).
     Solution; Repl. 460 (IRF520 MOSFET) & tested.

     Problem; Monitor shaped like hour glass.
     Solution; Repl. 460 & tested.

     Problem; Monitor won't come up.
     Solution; Repl. 477 (HER205 diode) & 438 (FR205-F diode) & tested.

Wells-Gardner
     Problem; ? (no tag).
     Solution; Removed nut from ZD301, replaced ZD301, C200, U301, U302, U303, U700, & tested.

[SAT (aka GANDHI)]

I believe this something worth passing along...a couple weeks ago I had two Kortek monitors that were slow to initialize when powered up(up to 10 minutes before the raster would start glowing...).  The problem component(s) turned out to be C107 &/or C108...both capacitors work with IC101 for a FBT lock...

Mike><>

[SAT (aka GANDHI)]

Schematic for backlight inverter...

Mike><>

[SAT (aka GANDHI)]

Schematic for a Kortek used in a Bally...

[SAT (aka GANDHI)]

(written by lahillbilly)

I have some wells gardner monitors in aristocrat machines, that are missing every other horizontal line on the bottom 1 in of the monitor sreen. Can not take monitor off floor to trouble shoot. Any help apreciated.

[SAT (aka GANDHI)]

Hi la...,

Do you have model number on the monitor?  Just from the description, it sounds like a capacitor has flaked out on you...look for an electrolytic cap that has domed top in the horizontal circuit...

Hope this helps...

Mike><>

[SAT (aka GANDHI)]

Had a couple tough ones recently and thought I'd share the repairs...

The first was a Ceronix monitor used in a Konami.  The problem originally was a blacked out raster, I checked the H.O.T. and found it shorted... easy fix...replaced the H.O.T. (433), powered the monitor up and it came up with a perfect picture...for about one minute hissy fit and blacked out, again...looked a little further in the circuit and replaced IRF520 MOSFET (460) & the H.O.T., again...powered the monitor up and it came up with a perfect picture...for about one minute (again) hissy fit hissy fit, well this went on a couple more times with the same results.  I finally dug my head out of my donkey and found LA7851 (415) was overdriving the H.O.T. and surrounding ckt. applause

The second one was a Kortek 1982F used in a IGT slant top...the monitor had horizontal collapse (a single line running vertically on the raster....( l )).  Checking the schematic I started assuming the problem "had" to be in one of two ICs that the horizontal sync went through...silly me duh!  As it turned out the H.O.T. (Q302 a SC25584) was flakey...though it checked "good" on a multimeter.  I need to thank a tech at CasinoTech for this repair yes...I might still be replacing components in the horizontal circuit if he hadn't clued in to looking closer at the H.O.T. !!!

Hope one or both of these helps someone out there...
Mike><>

[SAT (aka GANDHI)]

(written by lahillbilly)

I have a Korteck monitor model 1703N that has 3 diagonal that has 3 diagonal black lines about one half inch wide. Any help would be appreciated.

[SAT (aka GANDHI)]

Hi lahillbilly,

I'd probably start with this one...
Problem; Dark stripes on left side.
Solution; Repl. D904 on dynamic focus bd.
If not, try...
Problem; Horizontal Tare.
Solution; Repl. C123.

If you could post a picture or better description, I might be able to figure a better solution...
Hope one of these helps...

Mike><>


(lahillbilly said thanks at the end)

[SAT (aka GANDHI)]

schematics for kortek 1403

[SAT (aka GANDHI)]

Had a problem with a Tovis monitor today, at first glance it looked like a shorted H.O.T.(Q308), but once I removed it from the circuit it checked ok, and empty position still showed a dead short across all three legs.  Looking a little deeper into the circuit I checked D301 it showed a dead short, until I removed it from the circuit then it checked good, too.  After checking a little further, I found the flyback transformer had cracks and one side had "bubbled"...one of these days I'm going to remember to do a visual first duh!

Mike><>

[SAT (aka GANDHI)]

Thought this might be useful to someone out there...thanks to the folks at Sencore!

Mike><>

******(THIS IS A GOOD ONE)*****

[SAT (aka GANDHI)]

Some may find this helpful...thanks to Sencore...

God bless,
Mike><>

[SAT (aka GANDHI)]

I don't believe these are quite as available as Ceronix, Kortek, Or Kristel schematics...thanks to Sencore...

BTW...the last one that says "Schematic" is for a Tatung...

God bless,
Mike><>

[SAT (aka GANDHI)]

(written by elvisc)

Can anyone have any software for windows for testing monitor resolution, color, linearity, focus,... and with an animation in diferent resolution to test monitor for more time (about mor than 1 hour)...
Thanks.

[SAT (aka GANDHI)]

Hi elvisc,

I don't know of any program like that for a computer...Sencore makes a "VideoPro" test equipment that has many of the test features you mention..."click" on the link if you're interested;

http://sencore.com/products/vp401gaming.htm

Good luck & God bless,
Mike><>

[SAT (aka GANDHI)]

thanks...this is an good test equipment...

I have found this freeware program on internet
http://www.softpedia.com/get/Multimedia/Video/Other-VIDEO-Tools/Nokia-Monitor-Test.shtml
Its good for testing, but this program don't have the option to change resolution and don't have an animation to test monitors for more times

I need something like this program but freeware becouse in my company its a problem to purchase this program
http://www.passmark.com/products/monitortest.htm

Its have
Looped testing to continually test your monitor
and
Support for all available resolutions and color depths
this is that I need...

If anyone have an program like this.

Thanks