Need some help with a dead Hitachi GMK-29FJ monitor in a Jaleco Pony

[Iori]

Bought a Japanese Jaleco Pony Mark 4 a little while ago, got it pretty cheap because the monitor was bad in it.

[dabone]

Recap that chassis.

You WILL NOT FIND A KIT.


Remove the chassis and write down all the cap values, then call zanen and fax him the list.
He will build a cap kit for you from the list.


I had the same kind of problem with a monitor in a super neo 29 cab (I still have no clue what kind of monitor it is.) and a recap of the power supply section brought it back to life and a full cap kit fixed the rest of the picture problems.


Later,
dabone

[Iori]

Recap that chassis.

You WILL NOT FIND A KIT.

Remove the chassis and write down all the cap values, then call zanen and fax him the list.
He will build a cap kit for you from the list.

I had the same kind of problem with a monitor in a super neo 29 cab (I still have no clue what kind of monitor it is.) and a recap of the power supply section brought it back to life and a full cap kit fixed the rest of the picture problems.

Thanks for the heads up on the cap kit, dabone.

[dabone]

I had the same kind of problem with a monitor in a super neo 29 cab (I still have no clue what kind of monitor it is.) and a recap of the power supply section brought it back to life and a full cap kit fixed the rest of the picture problems.

My monitor is a Hitachi GMK-29FS3. Looked back at my old messages and found that I had found the model number (After I had already fixed the thing).

Remove the monitor from the cab before doing any work on it.

The caps for the power supply section are the ones located in the general vicinity of the iso transformer.

Discharge the tube before trying anything to do with reseating the anode lead.

Also, if you anode lead has come loose , chances are you have blow your hot (Horziontal Output Transistor)


Later,
dabone

[Iori]

Thanks again for the help... going to have to look into getting the monitor pulled and looking at all this this week.  Suggestions on any of the unanswered above is still more than welcome...

Hopefully next time I post to this thread it is to report a successful repair.   

[dek]

If you don't get it fixed, I will buy the dead chassis/neckboard from you.

[Iori]

If you don't get it fixed, I will buy the dead chassis/neckboard from you.

I'll let you know if I give up on it and end up replacing the monitor all together...

[dabone]

If I remember right the 8liners chassis will work with that tube/yolk combo.


Later,
dabone

[dek]

They were the first ones I contacted about it, they said they had nothing for 29 inch monitors.

[Iori]

Well, was able to set this in a semi stable manner on the cp tray tonight and get it discharged, here is what I found in the process:

-The anode lead was quite securely attached to the monitor.  So I'm sure that is not the problem, After messing with it I can't imagine how it could be knocked lose...

- The wire that didn't look like it was attached that I pointed out above was actually attached.  Just not attached to that particular pin, but one that is beneath the red wire next to it as seen in pic  in first post.

- The monitor is actually model No. GMK-29FJ  I messed that in the original post.

- There is tons of black crap (really filthy fine black dust) that is all over the tube and neck of the monitor.  Is this stuff just attracted to the tube or is it it possible that it is the result of something blowing out?  The whole inside of the cab was filthy so I am guessing that this stuff is just somehow attracted to the tube when it is powered up and that is the cause...

- One other odd thing that I noticed after putting things back together and powering up a few times.  If I power up a second time right after powering off I will hear a ticking noise coming from the pcb, though this noise is not detectable the first time I turn it no cold...  That mean anything to anyone?

So it looks like I'm at needing to pull the board out and do a cap kit.  Was trying to avoid it, but it looks like there is nothing else to try here now.  dabone, I have been trying to figure out what the isolation transformer on the monitor board is, but can't figure it out... do you mean the caps that are near the power in line to the pcb?  That area can be seen to the far left where a black wire comes onto the pcb and is clipped along it with a turquoise clip.  If you could point out the area you mean on the board that would be much appreciated. 

Again just want to say thanks for the help so far it is much appreciated! 

[Jess--]

the layer of fine black / grey dust is pretty normal and doesnt normally cause a problem, yes it is attracted to the back of the tube and the main HT lead.

[dabone]

I'd replace the caps is the following area first.

(Actually, I'd just order every cap on the chassis, but thats just me.)





If you look at the board closely, you can see the areas are defined in white lines silkscreened on the boards.


And get a paintbrush and dust that sucker off.


Later,
dabone

[Iori]

Good to know all that crap is to be expected Jess. 

I'd replace the caps is the following area first.

(Actually, I'd just order every cap on the chassis, but thats just me.)

If you look at the board closely, you can see the areas are defined in white lines silkscreened on the boards.

And get a paintbrush and dust that sucker off.

Yea, I'll order them all just in case...  when I pull the monitor again to get the board out later on I'll be cleaning the hell out of the tube, the bard and the inside of the cab in the upper area, it needs it bad!  Thanks guys...   

[dabone]

Don't clean alot off the tube, it's has a coating on it that allows it to work, clean it off and your tube is worthless.(or has to be recoated)


Later,
dabone

[Iori]

Don't clean alot off the tube, it's has a coating on it that allows it to work, clean it off and your tube is worthless.(or has to be recoated)

Thanks for the heads up on that, I'll stick to dry cloth for cleaning that area.  This stuff comes off pretty easily, but there is lots of it and it is really dirty...

[dabone]

Use a dry paintbrush.
Works better than a cloth, just haul the monitor outside before you start dusting it off are the dust will just go everywhere, and then back on the monitor after you get it working.


Later,
dabone

[dek]

Update?

[Iori]

Update?

Sorry, no update yet... I will be sure to post one when I have one.  I still have yet to pull the board and order my caps.  Things have been keeping me from working on it the last few weeks.   

[albert_c]

Looks like this thread never got updated.

I just picked up a Jaleco Pony Mark IV with a Hitachi GMK 29FJ2 chassis.  Picture looks nice and crisp but it's not displaying red..  I checked all the RGB connections and they are all okay.  Would capping the monitor get it to display Red, or could it be something else?

Thanks for any help