Coby 40 TFTV4028 LCD TV Logo
F
Francisco slinger Posted on Jul 21, 2015
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Tiny bars running through bottom half of screen

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The Knight

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  • Coby Master 76,851 Answers
  • Posted on Jul 21, 2015
The Knight
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T'Con board fault. Replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

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Any advice on what board I should replace if the left half of the screen is no good, just showing white and black vertical bars? Right half is fine. Is the panel kaput?

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
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Vizio half of screen is solid color bars. Top half works great.

You have either the circuit board that drives that half of the screen(one for top and another for the bottom) or you have a bad display panel.
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No sounds . no voice . no noise on numbers. cannot hear people talking. cannot hear voice mail. will ring. cannot answer

take it your phone has been dropped a couple times? lol..

Does the screen work normally? either way if you havent fixed this yet (seeing as this is 23 days old as i post) your going to have to take your phone apart. you can try the easy way and take the bottom half apart but dont try to take the screen off. there is a flimsy ribbon cable that runs from the top corner of the bottom half through the hinge that is easier than heck to break. after you get the bottom half apart try pressing down on the plug of it to see if it is loose then try your phone again.

the reason i asked if the screen is working is because that one cable usually handles everything in the top half and when one thing in an electrical device (expecially a small one that has a bunch of tiny components) doesn't work there can be no telling what else will go with it
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I have on scree this message: align screen tap the target firmly and accurately at each location on the screen.the target will continue to move until the screen is aligned . so i do it but the result is o....

98% of all Axim X5's with screen alignment problems can be fixed
using these instructions. The design of the unit eventually wears
through the ribbon connector to the screen, and causes it to be
grounded, which gives you the sympton of always needing alignment.
A 3mm piece of electrical tape will usually eliminate the problem
for several years. This is fairly easy if you have tiny screwdrivers,
but I assume no responsibility if this doesn't work or something breaks.

1. Backup data with ActiveSync's Backup/Restore function under "Tools"
on the desktop PC. If you use Vista's Windows Mobile Device Center,
it's under Mobile Device Settings-->more-->Backup and Restore.
If you use a browser, delete the temp cache, cookies and history files.
2. Remove main battery to uncover two screws, and remove backup battery
and any memory cards or blanks.
3. Carefully unstick the four rubber feet on the back, uncovering four
more screws.
4. Very slowly unstick the two rubber side panels, making sure most of the
sticky stuff stays on the rubber grip.
5. Use a tiny phillips screwdriver to take out the six screws on the back.
6. Carefully separate the front and the back halves of the case. A little
prying with a tiny flat screwdriver might help, especially at the bottom.
The half covering the top might have to be moved further up so the top
will clear the headphone jack. The front should have only the speaker
wire connected to it, which can easily be pulled up and off.
7. Locate the small mylar cable at the bottom of the front of the screen.
You'll see a nick or dent in the insulation right over the left wire.
Take a tiny piece of electrical tape slightly larger than the nick and
put it on. Don't push too hard on the cable.
8. Put the case back together, reversing the directions above. Plug the
speaker wire back in with the black wire on the bottom, red wire on top.
Put the top half back on starting at the top of the PDA by putting the
dark plastic part over the headphone jack first. Put the bottom half
back on starting at the bottom of the PDA near the sync connector by
putting the two easy-to-break snap-in nubs in place first.

Good luck!
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1. Solder the vertical IC. & IC supply capacitor.

2. change the vertical IC
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hi, ya had solved this issue many times, the problem is with the switches on the monitor, you will have to clean it or replace it, sometimes a mild hot air blower on the control pannel also helps. but be careful not to over heat the screen, for all this you will have to open the monitor cover to access this switches.. let me know
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look for a tiny pinhole and insert a pin while powered up to reset the device
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Screen split with black bar through center, top of picture shows in bottom

It sounds as you desribe, the vertical output IC and or the b+ feed capacitor off the Hi voltage transformer feeding the vert. IC its required voltage. Not a really hard job to replace, but not for a handi person to do. This should be left to the professional, as there are no user serviceable parts inside this set and with the HI voltage and the safety issues its best to call somesone to assist you with this repair. Good Luck
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