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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Sat 07, 2021 4:34 pm 
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Joined: Jan Tue 29, 2019 7:01 pm
Posts: 486
Location: 20653
I got the protection lense reinstalled. It's the first one I have attempted. I guess it looks ok. Got get it installed in the set and fired up to see how bad my attempt was.

Attachment:
PXL_20210807_145847081.jpg
PXL_20210807_145847081.jpg [ 582.31 KiB | Viewed 1119 times ]


Andy


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Sat 07, 2021 4:48 pm 
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Joined: May Thu 14, 2015 4:15 pm
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Location: Dallas, TX
Looks great from here!

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It's not the Destination, It's the Journey.


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Wed 11, 2021 2:05 am 
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Joined: Jan Tue 29, 2019 7:01 pm
Posts: 486
Location: 20653
I put the tv back together to protect the CRT and gave the tv a quick bath. I won't be back on this for a while but I did enjoy the CRT fix.I have to find a picture of what tat front panel looked like.

Attachment:
PXL_20210811_002824916.jpg
PXL_20210811_002824916.jpg [ 686.19 KiB | Viewed 1078 times ]


Andy


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Wed 11, 2021 7:04 pm 
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Joined: Jan Tue 29, 2019 7:01 pm
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Location: 20653
Before I pt this one on the to do shelf. I decided to do a quick power up. I fired it up on my variac and it fired up without letting any smoke out. It was drawing 1.27a at 120V and has a raster. The picture looks worse than I cant see in person. Its just a solid white picture to me. It has issues like but looks to be fixable. I found an image of like model that I can use to figure out what to do with the panel above the CRT.

Attachment:
PXL_20210811_175100356.jpg
PXL_20210811_175100356.jpg [ 722.76 KiB | Viewed 1057 times ]


This is what the panel should look like

Attachment:
maxresdefault.jpg
maxresdefault.jpg [ 346.94 KiB | Viewed 1057 times ]


Andy


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Thu 12, 2021 4:05 am 
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Location: Arvada, CO, 80004
Way to go for restoring such a set. Not many people would do such a thing. You and me are some of the last.

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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Thu 12, 2021 5:34 pm 
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Location: Pewaukee, WI
Looks like there are 2 problems: the vertical isn't filling the screen (the cathode lytic on the vertical output is a likely cause), and there's no signal which could be a dirty tuner bad tube or no signal source in the last picture...


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Thu 12, 2021 8:29 pm 
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Joined: Jan Tue 29, 2019 7:01 pm
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Location: 20653
Quote:
Looks like there are 2 problems: the vertical isn't filling the screen (the cathode lytic on the vertical output is a likely cause), and there's no signal which could be a dirty tuner bad tube or no signal source in the last picture...


I agree on the vertical. I did not have a signal injected so the non picture was expected.

Andy


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Tue 24, 2021 3:19 pm 
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Joined: Jan Tue 29, 2019 7:01 pm
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Location: 20653
No good deed goes unpunished. I had a few minutes and decided to replace the electrolytic the vert section as mentioned previously and while I was at it I did a little tube jack cleaning and pot deoxiting. I finished those 2 task and fired up he set and was greeted with no raster an tube filaments off. I started doing some checking and some how I managed to do this.

Attachment:
17gv5.jpg
17gv5.jpg [ 2.82 MiB | Viewed 929 times ]


Now I am waiting on a replacement to arrive. No idea how I did this but I am sure Drop Dead Fred was had something to do with it.

Andy


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Tue 24, 2021 4:22 pm 
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Joined: Dec Mon 23, 2019 5:52 pm
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Don't beat yourself up over that tube. Cracking around the bases of those horizontal output tubes is not unusual, doesn't take much to finish them off when turned back on after a long time.


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Aug Tue 24, 2021 7:34 pm 
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Joined: Nov Thu 11, 2010 6:03 pm
Posts: 1604
Location: Pewaukee, WI
Had that happen to me on the $25 6LQ6 in my CTC25 a couple weeks ago...the pins had corroded a bit and between that and heat cycling the envelope cracked...It went down to air while running so I got to watch the raster shrink, go dark and the damper start to redplate as the base of the output started glowing blue/purple and sparking. It's not super common but it happens.


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Sep Wed 08, 2021 1:25 am 
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Joined: Jan Tue 29, 2019 7:01 pm
Posts: 486
Location: 20653
I am finally back at home and got a chance to install the 17gv5 and powered the set up and got, notta. I realized the filaments were not lit up and started a search for another bad tube or at least connection for a tube. The set was drawing about 300ma. I discovered that the 6ae8 in the tuner (it is completely shielded) had also gone to air. What ever took out the 17gv5 also went after the 6ae8. I was able to find a 6gh8a to replace it. I brought the set up on my variac and we have a raster again and the vertical issue is much better with the replaced electrolytic. If I have time tomorrow Ill see if I can get a picture and sound (there is sound, just static).


Last edited by Govee on Sep Wed 08, 2021 12:56 pm, edited 1 time in total.

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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Sep Wed 08, 2021 8:20 am 
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Joined: May Sun 07, 2017 11:35 am
Posts: 1549
Location: Belrose, NSW, Australia
Quote:
Don't beat yourself up over that tube. Cracking around the bases of those horizontal output tubes is not unusual, doesn't take much to finish them off when turned back on after a long time


In the late 60's GE used to make B&W portables locally (in Australia) using Compactrons. The service company I worked for did warrant service on them. We saw a batch of tube sockets that were made from a type of plastic that would shrink with heat, crunch the tube pins and crack the glass, especially on the 38HE7 hor OP - Damper tube. Diabolical!

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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Sep Wed 08, 2021 1:03 pm 
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Joined: Jan Tue 29, 2019 7:01 pm
Posts: 486
Location: 20653
Quote:
In the late 60's GE used to make B&W portables locally (in Australia) using Compactrons. The service company I worked for did warrant service on them. We saw a batch of tube sockets that were made from a type of plastic that would shrink with heat, crunch the tube pins and crack the glass, especially on the 38HE7 hor OP - Damper tube. Diabolical!


Manufacturing/production choices and there impact on MTBF can be clearly seen here.


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Sep Wed 08, 2021 6:05 pm 
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Joined: Jan Tue 29, 2019 7:01 pm
Posts: 486
Location: 20653
I know have picture and sound.

Attachment:
zenith.jpg
zenith.jpg [ 700.29 KiB | Viewed 450 times ]


Andy


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Sep Thu 09, 2021 7:54 pm 
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Joined: Nov Thu 11, 2010 6:03 pm
Posts: 1604
Location: Pewaukee, WI
Govee wrote:
I know have picture and sound.

Attachment:
zenith.jpg


Andy

Looks like all it needs is adjustment of the height, vertical linearity and possibly centering.
If you don't have a test pattern generator get a DVD movie with end credits that have even spacing between lines of text when viewed on a different set, pause the DVD and adjust height and linearity to even out spacing on your TV. Another thing you could use instead of end credits is a close up of a circular object like a clock, the sun or a wheel and adjust set for roundness.


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Sep Fri 10, 2021 10:46 am 
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Joined: May Sun 07, 2017 11:35 am
Posts: 1549
Location: Belrose, NSW, Australia
A better idea is to use a real test card, stored on a USB stick and displayed by the slide viewer feature of your media player.

There's a good one in this post, the Philips PM5544 test card stretched so that it displays properly in 4:3.

viewtopic.php?f=3&t=378196&p=3326631&hilit=PM5544#p3326631

That is a RARE flyback I managed to find for this guy! I hope I never need one myself!

I'll paste it here as well. You can right-click it and select Save Image As

Attachment:
PM5544_16_9..jpg
PM5544_16_9..jpg [ 74.89 KiB | Viewed 400 times ]


Yes this is a PAL test card but it will work just as well on US EIA / NTSC 525 lines and display with the correct aspect ratio.

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Wax, paper, bitumen, cotton, high voltages - what could possibly go wrong?


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 Post subject: Re: Rough but complete Zenith L2150 luggage portable
PostPosted: Sep Fri 10, 2021 8:48 pm 
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Joined: Jan Tue 29, 2019 7:01 pm
Posts: 486
Location: 20653
Here it is hooked up to my 1077b.

Eek! No knob turning made it better than this. All I've done electically is replace 2 tubes and 1 cap. Lots more to go thru here.

Attachment:
PXL_20210910_194232880.jpg
PXL_20210910_194232880.jpg [ 3.65 MiB | Viewed 388 times ]


Andy


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