Question about RCA P52940 52" Rear Projection Television

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Picture flipping Found a place on back for vert/hgt, but it is set in. Have tried inserting a screwdriver and turning, but no luck in stopping picture flipping.

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Re: picture flipping

The P52940 uses the 195 series chassis. The vert/hgt control is for vertical height. It adjusts the size of the picture from top to bottom. If your picture is flipping, it most likely means that something is wrong in the vertical circuits. I have seen fluid leak out of one of the CRTs and drip down on the vertical output IC, causeing the picture to go crazy vertically. The set should be serviced by a qualified tech experienced in the RCA 195 chassis.

Posted on Aug 19, 2007

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Top of screen disappeared...cant see score of game

The Height adjustment is off... look in the back of the TV set, it has some knobs in the back, one should be vert.lin for Vertical Linearity adjustment, and there is another call Vert.Hgt. for Vertical Height adjustment. try adjusting the Vertical Height first with someone watching in the front of the big TV to see if the top comes back into view, you might have to adjust the knob very slowly one way then the other way, to make this adjustment. If it doesnot adjust take it to a TV shop to get it repaired.
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I have the same problem with a WD 73732. After about an hour fleshtones go blue / purple, and picture flashes. I gutted the set, and ran it on the bench, and found that a sensor on the color wheel (a small external board), acts up when it gets hot. Cooling the board fixed the picture. I'm going to try to find a replacement part, and then make vents in the color wheel cover so it doesn't get so hot in there.

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Call him back and tell him that your tv has bad connections. He will check for bad connection on main board in horizontal..........

Sep 13, 2009 | Hitachi 46F500 46" Rear Projection...

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Thats what happened your convergence went out, those parts can be found online for as little as 12.50 a piece. If you are good with solder its an easy fix. I found a guy on craigslist in denver who fixed it for 150
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try hitting the side of your set to see if you can get it to jump out of place. If your can get if to fail by doing this your convergence amps have bad solder joints.

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Samsung HLN617W Screen Moved Up

Yes, you can repair it yourself. All you need is solder, solder wick, a capacitor checker rated at more than 1000uf and a screw driver.First, remove rear cover and locate vert. circuit. Check all 100uf capacitors around vertical output. Unsoldering one leg to remove from circuit so as to get a good reading. Replace leaky ones with equal value. Another possible cause for that is the convergence board. If you have colored shadows around the screen there is a small board up above main p.c.b. Simply replace it. Another thing to try is to access svc. menu and write down value of vert. hgt. Then change it back and forth to see if it is adjustable. this may be an easy, or difficult fix. Good luck, Russmann.

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1 Answer

Is this fixable??

Unfortunately, this sounds familiar. Many of these sony projections had bad crt's.(picture tubes). Now here is a secret I learned along the way. The short in the picture tubes is in the filament, causing that color to overpower all others and sometimes causing pix to disappear until set is shut off and back on. If you are very careful and use an insulated screwdriver, you can sometimes tap on neck of picture tube and knock debris from filament causing extended tube life. This is dangerous and must be performed with set turned on. From front of set gently tap on neck of tube(s) in question using insulated handle of screwdriver to make contact with picture tube neck. Picture will probably flash whichever color tube is contacted. Eventually, if picture stops flashing that color as much, you can sometimes get several more months out of your set without any problems. Only alternative is to try a crt rejuvinator or replace tubes at a cost of 200.00 each if avail. plus labor. Good luck, Russmann.

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The problem you are describing is called loss of verticle deflection. You will find this will require diagnosis and there is no simple answer to this repair. Most likely there will be either bad electrolytic caps or bad vert. output IC in the vert. circuit.

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1 Answer

Blury lines in the picture / no picture / intermitent no control

Is great you have already found the place to hit and get the picture back,is a loose conectiont that need resoldering before it gets worst or damages something,be ateentive were you hit and flip the crcuit board,the broken solder joints should be easy to spot. If you are not too familiar with tv service seek the help of a servicer and tell them what you do to make it work,the repair should not be xpensive since you already diagnose the problem.Good luck

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