Question about JVC Televison & Video

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Video folding over

Top section of tv screen seems low. Top video is folded over like mirror image for a couple of inches. Looking for service manual + parts layout diagram

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  • brad_pearman May 26, 2009

    The Manufacture is JVC
    The model is AV 27920

    any schematic, parts list, layout diagrams would be helpful.


  • brad_pearman May 28, 2009

    Thank you, replaced C424 with 100 µF/50V. Picture is restored.

  • Justin Rubsam
    Justin Rubsam May 11, 2010

    If you can post a model number I can get you some information.

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  • 39 Answers

I don't have a print for this set, but vertical issues have been common on these. Here's what you need to replace to restore the vertical:

IC421 (LA7832), D422 (MTZJ75-T2), D541 (RGP90J-5025-T3), R541 (1.8/2 W), C424 (100uF/35V) and C425 (470uF/35V)

Posted on May 27, 2009

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Tip

Rocket Grill - How to make Inexpensive bags - As low as 2 cents each


Many of us have Rocket Grills which we love, but the bags can be expensive, and it is a pain if you run out of them when you want to use the machine. Here is my solution which I have been using since the machine was originally released. They will hold fat and juice too.

First of all, you are going to need to get some parchment paper. I buy bulk 12 x 16 sheets from a supplier off eBay. (Remember the more you buy, the lower the price). In an emergency you can use a similar technique with Reynold's Parchment paper rolls from the store.

You Need

A. 12 x 16 Parchment Sheet/S
B. Stapler
C. Sharp Pencil or Pen
D. Table or Flat Surface
D. (My Optional Template)

Instructions

A. Take one sheet and fold it in half. so you have an 12 inch wide by 8 inch deep sheet. Crease the sheet by running your finger firmly over the fold.

B. Place the folded sheet on the table, so that the fold is at the bottom as you view it.

C. Now along the short open sides (left and right sides of the sheet), one at a time, fold both layers over as a flap about 1 and a half inches. Try and keep both of these folds to the top.

D. Using a stapler, Staple each side that you have just folded one inch from the top, and a quarter inch from the edge on each side.

E. Turn the parchment paper 90 degrees counter clockwise so that the sealed bottom faces to the right.

F. Take the bottom part of the flap that you created in section C, and fold it back at a 45 degree angle. You should end up having two equal size triangles.

G. Turn the paper back around so that the first fold (A) is at the bottom again.

H. Staple each fold that you just created, about a quarter inch from the top of where the folded edge is. (see picture)

I. Place three equal spaced staples in-between the two staples you just did in section H. You should now have 5 stales in one line, about an inch and a half from the bottom of the bag.

J. Pick up the bag, softly fold it in half in the opposite direction as of section A. Make a tiny crease in the top (Open section). This is so we can find the center of the bag.

K. Place the crease over two of your fingers, and gently push the Pencil or Pen through the crease about 3/4 of an inch from the top. Do not rip the bag) This will be used hold the bag in the grill. (I have cooked 1lb steaks in the grill, and the hole holds the weight fine. Be gentle though)


Comments

A. I know that it is possible for the staples to lightly scratch the grill. However the Grill pads are not designed to come into direct contact with food anyway, and will not damage the grill

B. Some people may wonder about using staples near food. If you use new staples from a clean box you will have no problem. The heat from the grill will sanitize any impurities that may be on them. Also not that it is highly unlikely that your food will ever touch the staples.

C. The pouch at the bottom will hold fat and juice, but depending on the quality of the paper you buy will determine how well the bag holds up. It is possible for the juice/fat to weep through the staple holes, but thats why you have a drip tray.

Thats all folks. Message me if you have any questions.2bda07b.jpg39f5fe9.jpgb6d7936.jpg7040cb1.jpga957872.jpgcbfcbde.jpg

on Apr 17, 2010 | Kitchen Appliances - Others

1 Answer

A black line (about 2 inches wide) appears at the top of the screen with this amount of the picture looking like it is folded down translucently over the remaining picture. What's up?


Hello
Your TV has vertical fold problem. Just check all the electrolytic capacitors. On checking, most of them may look good. But on circuit, when energised, will show problems. So it is best to replace all of them once and check. Please check the electrolytic capacitor connected to the vertical power supply [usually comes from the secondary supply section of the Line Output Transformer], first, and replce it. It may be a 1500Mfd or 2200mfd. Check it first by replacing a new one. In most foldover cases, this service will solve the problem. gopakumarg43@ymail.com

Oct 18, 2010 | Philips Televison & Video

1 Answer

Horizontal lines in the top


CAUTION!!!!
you should never fix the inside of the tv unless you are a professionel tv repair man
there is High voltage and the only thing you should to is get a new tv set.

Nov 15, 2009 | Televison & Video

1 Answer

When powered on, automatically shuts off with red flashing light.


you can claim the repair on your home insurance policy as FUSION

Sep 13, 2009 | JVC AV-27920 27" TV

1 Answer

Hummer H2 Power folding mirror won't fold


The power folding function of your exterior mirrors on your '04 H2 depends on a plastic gear to collapse those mirrors at the touch of a button. That plastic gear strips very easily. The service adviser at our Hummer dealership said that problem was rectified in later model years with a redesign of of the collapsing mechanism of those mirrors.

I don't mind manually folding our mirrors, and I was afraid to ask about the cost of the parts required to solve the issue. The service guy didn't volunteer the cost of the fix. Not typically covered by aftermarket extended service/warranty plans.

Jul 28, 2009 | 2004 Hummer H2

1 Answer

Image compresses to the middle of the screen after 20 minutes


This TV have problem in Vertical section, probably the capacitor or cold solder. by replacing the dried capacitor and resoldering the component will help to solve the problem.

Jun 01, 2009 | Sylvania 6432GG 32" TV

1 Answer

My tv has this lines that bend over the front top of the screen and when an object moves through the lines the image appers from the the top of where the line begins...and the tv goes black every once and...


This sounds like a vertical deflection fault. There are some components that are failing in the vertical deflection area that are starting to fail. It is very common in many of the sets that there are electrolytic capacitors in the vertical amp section that are gong out of specifications.

When you have at the top or the bottom of the screen where the vertical axis is compressed, and the picture in the compressed area looks like it is inverted and going over on itself, this is called "vertical fold-over".

An experienced TV service technician should be able to service this for you.


Jerry G.

Apr 18, 2008 | Televison & Video

1 Answer

White Horizontal Lines near the top of my Screen


this symptom is what we called vertical fold-over. vertical fold-over is characterised by a white horizontal bar on the bottom or top of the raster due to the concentration or compression of the trace lines. it an image is present, the bottom or top portion is fold over. this is caused by a vertical deflection current with poor linearity, which compresses the trace lines at the bottom or top of the screen. this symptom is is caused by a defective sawtooth wave genetator circuit, or improper biasing or defective feedback circuit of the vertical drive or vertical output transistor/ic. the negative feedback circuit in vertical deflection circuit compensates for the linearity of the trace portion of the sawtooth wave. a decrease in the capacitance of the sawtooth generator capacitor is usually the trouble. but if you do not understand anything what i have written here, better bring it to a qualified tv technician for your own safety also. good luck!

Mar 01, 2007 | JVC TM-2703SU 27" TV

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