Question about Mitsubishi WS-65809 65" Rear Projection Television

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The picutre is concave on all four sides you can "whack" it and it will straighten up for a few minutes. What do i do?

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Your convergence ICs are loose and need resoldered. This is a common occurence. Find a hobbiest in elctronics or a TV tech,to do this for you!

Posted on May 08, 2010

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Hi, we have a AMMCO 7750 brake lathe, the problem is runout in the ARBOR we have replaced the arbor but still have the same result. We are unsure of hat is causing this so any help or advise would be...


First off--your model Ammco is their "El-Cheapo" model.
Yeah, they work, when they work that is.
I doubt that your problem lies within the spindle bearings. But it could-- I suggest that you tug on the spindle to see if you get any back and forth end-play, or up and down play.... if so, you are screwed. This machine is not worth the effort, money and time fix this problem.

As for the arbor...

This model uses the same arbor that the better 3000, 4000, 4100, 7000 and 7100 models.

Every time you replace an arbor (new or used) you have to...

A. Lap the arbor into the spindle using lapping compound (just like lapping valves in a cylinder head) The lapping compound is then cleaned out of the spindle and off the arbor, then...

B. You then have to check the "runout" with a dial indicator. These are obtained cheaply at Harbor Freight FYI. With the dial indicator mounted (magnetically) on the twin-cutter check the arbor run-out. The runout (two inches from the spindle) should be no more than 1 1/2 thousandths. One thousandth or under is optimal. Any reading over 8 thousandths cannot be straightened.

C. If the run out exceeds 1 1/2 thousandths, you have to then straighten the arbor.

To straighten the arbor you will again need the dial-indicator and a heavy copper hammer....

With a wrench on the end of the draw bar (far right on the end of the drum gearbox), rotate the machine (counter clockwise) until you find the high spot on the arbor (carefully watching the dial-indicator).

Remove the dial indicator and give the arbor a whack with the hammer (not too hard if this is your first time) when the high spot is directly straight up.

Install the dial-indicator and check the run-out again.

Sometimes you will get it on the first whack--sometimes you will have to go through an ordeal until you get the arbor in spec.

And remember--sometimes you can bust the arbor completely off on the first whack. They are hardened and allegedly tempered, but some are more hard than others. If it breaks off--tough luck. You need to get another arbor.

I have personally straightened arbors more than 30 thousandths out (once)... and I don't want to repeat that ordeal. Sometimes arbors cannot be straightened (bent in strange ways) and cannot be straightened.

When loosening a rotor, do not allow the work to dump onto the arbor. This is the main reason they go out of whack.

Buy Sell Used Brake Lathes Brake Lathe Parts

Jun 29, 2010 | Ammco Combination Disc/Drum Brake Lathe

1 Answer

I am getting a high spot in the middle of the length of the wood that I am planing ie the middle is higher than the two ends, it bulges!


Always plane the concave side of the board rather than the convex side---its almost impossible to straighten a bulging side!

Aug 21, 2009 | Masonry Tools

1 Answer

Screen has double images on both sides, picture looks concaved. tv goes back and forth in this mode from normal to concaved


IC chips are Failing, and or A few Resistors in the Convergence circuit. Commen problem for Projection sets!... OneGeo.

Jul 06, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Blacks out for 1-30 min. then back on. Standby light blinks 4x


I would suspect the circuit board around the HV transformer area to have a crack circuit print. Also look around in the vertical circuit for interment solder connections. But only do these things if you have some knowledge of TV circuit lay out. If you do not feel confident then call a professional. No sense in hurting yourself or damaging the the set worse.
Hope this helps,
Skyassoc

Jun 22, 2009 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

Turned TV on and screen has a concave look to it.


change the convergence chips or lack of voltage in the chips get advice from tech never your home

May 04, 2009 | Mitsubishi VS-50705 50" Rear Projection...

1 Answer

RCA-picture discolors, goes concaved


Sounds like a capacitor in the power supply is beginning to fail.Unless your good at this type of repair, I would call a tech to have it serviced. And I would also not use the set until the problem is corrected, or it could get real expensive to fix.

Feb 02, 2009 | RCA HD52W58 52" TV

1 Answer

Viewsonic E70f,concave picture


Problem related to pincussion correction circuit.Normally dry solder near horizontal output / EHt section.

Feb 15, 2008 | Computers & Internet

2 Answers

Fuzzy, unstable display


This sounds like a high-voltage power supply problem, which would need to be diagnosed by an experienced computer or electronics technician.

Check to see if there is a small focus knob on the back. If so try turning it back and forth three or four times to "clean" it....then adjust for correct focus.

Symptoms like this can also be caused by accumulated dust inside the monitor.

Jan 15, 2008 | Sony GDM-C520K (Dark Gray, Gray) 21" CRT...

1 Answer

My Cyber shot is not working :(


try this! i did and now it works!!

easy! charge the battery.With power off,whack the base of the camera against the palm1.gif of your hand four or five times.wait five minutes,turn camera on and whack the side of the camera nearest the lens against the palm of your hand.then whack the base again and the lens should pop out.Worked for me!!!

Nov 30, 2007 | Sony Cyber-Shot DSC-S40 Digital Camera

1 Answer

Green Lines and off-center near top


sounds like you need the convergence kit part number X480295

Oct 08, 2007 | Hitachi 53UDX10B 53" Rear Projection...

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