Re: Another 42H83 conundrum.
Okay. I'll go ahead and replace that one.
Just for clarification the 'small signal board' is the one board that holds the two IC chips, and the inputs go into?
invader_star
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Last Activity: 03-20-2010, 02:05 AM
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Re: Another 42H83 conundrum.
*I would have edited my first post but it's been longer than 10 minutes.
I just checked the convergence generator, and to my eye all of the joints seem to be adequate. Nothing is blatantly bad, or looks bad. I can take a picture or something for a little more in depth scrutinizing.Leave a comment:
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Re: Another 42H83 conundrum.
Hello all, apologies for the extreme absence. I had lost most hope for awhile and until recently have been tired of staring at the TV in my living room.
I followed Krankshaft's advice and checked all of the sky blue resistors around the ICs. There were only four or five that I saw and tested; pulled them out of the circuit, tested, and replaced. Only one resistor seemed to be a little off, (1.1ohms, instead of 0.82ohms) but the percentage of error seemed acceptable, so I put it back in. Resoldered every resistor, naturally, and cleaned...Leave a comment:
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Re: Another 42H83 conundrum.
Yeahhh, true. We only knew of pico fuses potentially being an issue, and frankly that's all we looked for. We re-soldered several jumper wires, too surrounding the ICs.
I'm hoping so, too. It hasn't been on longer than a few minutes each boot, so hopefully everything is intact. I'll look for those resistors.Last edited by invader_star; 05-12-2009, 12:06 PM.Leave a comment:
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Re: Another 42H83 conundrum.
Soooo, what you're both saying is that the STKs we got from B&D, which was recommended by Wizard, were rejects? And already failing from when we threw them onto the board?
This is frustrating. :\Leave a comment:
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Re: Another 42H83 conundrum.
[url]http://www.youtube.com/watch?v=Qtptzn0Uqvc[/url]
Framerate is kind of bad, but skip to half way through.Re: Another 42H83 conundrum.<br /> ...f way through.Re: Another 42H83 conundrum.
[url]http://www.youtube.com/watch?v=Qtptzn0Uqvc[/url]
Framerate is kind of bad, but skip to half way through.Leave a comment:
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Re: Another 42H83 conundrum.
Back from the dead; after ordering the two ICs and several pico fuses we got the rig soldered up, and put back together. We double checked several jumper lines to make sure continuity is running through.
Alas, the first boot is a success! Turns on just fine.
However, the Blue seems to be out of whack. Green and Red are just fine. Working perfectly. But the Blue is wavy and sporatic. After having the unit on for a few minutes, a touch focus was attempted. It failed. I've heard of having to try and getting the tubes re-synced...Last edited by invader_star; 05-11-2009, 11:15 PM.Leave a comment:
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Re: Another 42H83 conundrum.
Found two problematic fuses, (F852 2A, and F850 5A) that seem to be bad.
I found them on B&D. Will replace.
Just to be sure, would these two fuses cause the picture to go out? Is this the reason why I lost picture?Leave a comment:
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Re: Another 42H83 conundrum.
So, a little update. My father and I were able to get the boards completely out of the chassis. Wow, does Toshiba do a wonderful job at failing. Flux everywhere. Lots of cold solders. I'm surprised it worked as long as it did. Hopefully this thing is still savable.
Wizard, your picture of the pico fuses is correct. I finally found what you were talking about.
How do you tell which ones are bad?Leave a comment:
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Re: Another 42H83 conundrum.
No worries my friend, haha....Leave a comment:
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Re: Another 42H83 conundrum.
Started to disassemble this beast. I know there are very high voltages inside this thing. Taking the main circuit board out seems a bit straight forward, disconnect stuff i.e. cables and screws, but I do know how to remove the CRT anode cables (red ones) that connect to the high voltage assembly on the board. How do you discharge these things so that you are not having to worry about 31 kv knocking you across the room?
I need to remove the entore board to determine what needs to be cleaned, checked or replaced. Any help with this would...Leave a comment:
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Re: Another 42H83 conundrum.
Alright. I'll have to give it a shot, and hope the components haven't shorted themselves out. Thanks.
I checked and the projection tubes are still intact, so I'm left to blame good ol' H2O....Leave a comment:
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Re: Another 42H83 conundrum.
That's discouraging. Do you think I'll need a whole new power board?...Leave a comment:
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Re: Another 42H83 conundrum.
This is excellent, thank you. I had a question. On the power board, I've noticed a bunch of blue gunk on some of the chips. Do you think these could possibly be bad?
[URL=http://img16.*************/my.php?image=img0013h.png][/URL]...Leave a comment:
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Re: Another 42H83 conundrum.
Where do I find the blown fuses in the deflection/power board?
Where do I find the convergence ICs?...Leave a comment:
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Re: Another 42H83 conundrum.
Thank you thank you.
The whereabouts of said parts is beyond me. Where would I locate these?Leave a comment:
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Another 42H83 conundrum.
I've recently acquired a Toshiba 42H83 RPTV. The previous owner said it was messed up, and had some issues. I figured it's definitely worth a look.
From the first power on, I noticed a few things. The image was completely out of whack, convergence issues, and you couldn't realign them. The image was bent on the south sides, blue on the right, red on the left. (red.jpg and blue.jpg in the attachments show what the images did when I tried a touch focus. Green looked fine to my knowledge. All vertical lines were straight.) You could access everything as if the unit was fully functional,...Last edited by invader_star; 03-15-2009, 12:26 AM.
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