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Inkedivxx
Joined: 05 Aug 2009
Posts: 39
Location: Myrtle Beach SC
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 Posted: Wed Sep 30, 2009 9:54 am Post subject: Mitsubishi VS-50607 Short picture |
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I am working on a Mistubishi VS-50607 Rear projection set. I have a short picture at the top of the screen. I replaced the 100uf/50v caps in the convergence circuit along with the 100uf/50v cap in the vertical circuit.....It does not seem as if the IC's are bad......this set uses the STK392-110 convergence IC's I am not able to read the vertical output ID, does anyone have a manual or some ideas for me?????  |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Wed Sep 30, 2009 11:38 am Post subject: |
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| Quote: | | I have a short picture at the top of the screen |
Please define words in bold!
Compressed, black bar, streatched, folded over etc etc..
Jesse |
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Inkedivxx
Joined: 05 Aug 2009
Posts: 39
Location: Myrtle Beach SC
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| Posted: Wed Sep 30, 2009 11:44 am Post subject: |
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| Black bar with convergence lines on the very top of the picture |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Wed Sep 30, 2009 2:19 pm Post subject: |
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Any time the vertical height shrinks it will cause missconvergence. I would suggest first replacing the vertical chip IC451 - LA7845
Hope this helps
Jesse |
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Inkedivxx
Joined: 05 Aug 2009
Posts: 39
Location: Myrtle Beach SC
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| Posted: Fri Oct 02, 2009 6:29 am Post subject: |
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Thanks for the IC #.............   |
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Inkedivxx
Joined: 05 Aug 2009
Posts: 39
Location: Myrtle Beach SC
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| Posted: Tue Oct 06, 2009 2:45 pm Post subject: |
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| I went back out on the TV and I changed every cap in the vertical circuit, the top is still short. Will the vertical output cause a short top? If the vertical output goes, usually there is no vertical......I am stumped, I guess I will replace the output. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Tue Oct 06, 2009 3:25 pm Post subject: |
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| Or you missed a lytic. Maybe in Vert. out power supply? |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Tue Oct 06, 2009 5:36 pm Post subject: |
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It sounds like you are fighting this set. This set uses a light box. I would suggest you pull the box and set up in shop with overhead adjustable screen, mark top and bottom of sweep on screen and that will give you a reference for sweep improvement.
It's a lot better than frustrating your customer and making umpteen trips to the home.
I use a simple piece of marlite attached to a frame that can be raised and lowered independantly front and rear. You can adjust for perfect focus and convergence. no mirror is needed. PS: I have 36" roll-arounds and 9 foot ceilings so it may not be a suitable solution for you.
Jesse |
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Inkedivxx
Joined: 05 Aug 2009
Posts: 39
Location: Myrtle Beach SC
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| Posted: Tue Oct 20, 2009 12:12 pm Post subject: |
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OK, The TV is finally in the shop. I have replaced C464, C451, C402, C411, and C523 (the 35v supply). Now, this thing does not want to turn on. Yes, the polarity is right on all of the caps, and the caps are the exact value called for. I guess I will change the vert out now. Unless there are any other ideas.  |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Tue Oct 20, 2009 3:05 pm Post subject: |
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Did you pull the light box or the complete unit.
Did the set operate in the shop prior to your replacing the caps?
If it attempts to turn on and goes into shutdown you could now have complete vertical collapse.
Jesse |
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