Question about Akai LCT4216 42 in. LCD Television

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Akai LCT42Z6TM still broken after replacing caps

I have an Akai LCT42Z6TM with the same problems as many people here: the white lines, four colored squares, etc. I replaced the capacitors C280, C302, C320, C323 with new 100UF 35 V capacitors from radio shack (and I also replaced capacitor C336 because I saw it was bulging).
But I still have the problem!

The white lines and the squares are still there. Can anyone help me? Is there anything else that could be wrong with it? What else can I do?

Also, does anyone know if I can replace the main board with another third-party main board that is compatible with the LCD screen (which is made by LG/Phillips I believe)?

Thank You!

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  • Anonymous Oct 11, 2008

    Same lines and Squares problem with menus that have bad pixels and vertical interference lines. Will be trying the CAP fix and report back.



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You still need to replace C301. I can fix your mainboard if you need help.

Tom

Tommy@ruden1.com

Posted on Mar 21, 2009

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Sounds like you need to check the neg and pos side of the capacitor. i had the same problem after i changed all 4 of them. i had put one in backwords and after i switched it the picture came on clear.

Posted on Dec 15, 2008

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C320 -1000uf 35v electrolitic cap

Posted on Oct 22, 2008

  • jason Oct 22, 2008

    also check the trans and resistors at c320

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Yes, I am a computer / electronics person and by brother's tv had the same problem, here is a complete description of the problem and the fix. Many thanks to all that have come before

Symptoms

1) While watching tv, there will be vertical grayish lines that move around a bit on the screen
2) While viewing a menu, the menu will be all hacked up as if the bits are all out of order
3) If you unplug all of the sources and then re-power the tv, unplug from wall, the tv will seem it is working fine. Menus will work until a video source (Component) is plugged into the tv.

Tacking the back off

WITH TWO PEOPLE Lay the TV on a table with a blanket, etc to protect the tv. Do not try and move the TV with the back off in general. You may flex the screen and damage it.

Remove all of the screws from the back including the one under the sticker near the left bottom. Remove the stand from the bottom. Lift the back up from the left to the right. Power is hooked to the right of the back. Remove the two screws to remove the power jack from the back.

Remove the back and place aside

Remove the RF cover from and the board will be underneath

Remove all of the screws from the board and from the RCA connectors from the outside bottom of the board.

Carefully remove all of the wires, taking time to remove the glue from the connectors. The glue should "Snap Off", take your time here. Remove the wires, noting where they all are. Take your time with the big connector on the left side.

You will see that all / some of the caps will have a discoloration on the bottom.

Replace and replace ALL of the caps on the upper left side of the board. It's OK to replace with a higher value Voltage, they must be the same uf value of equal or higher voltage. They must be electrolytic caps (+/-). Make sure the line up the - properly with replacing. Radio shack may not have all of the them, but other electronics supply place should. They are call fairly common.

If you have never done this before, find someone that has, or find another tutorial on how to do this. You will need a small soldering iron and solder ****** and very thin solder from Radio Shack.

Replace the board, we tested by putting the board back. Sliding the TV on a table so the top could be seen and then plugging a source in and verifying it worked before reassembly. You HAVE to have a component source plugged in or it will false positive the test. We found this out the hard way....

Replace the back and the screws. On the right side of the TV MAKE SURE that the AC power wires are NOT in the way the screws on the right hand side.

Replace the TV to the original position and test....

Reason for Problem.

Either they have a flaw in the design, but more probably they had a poor supplier of the Capacitors. I have seen this before and we will probably see it again. This really should be some sort of class action suit since they are all failing about 1.5 years of use.

Any question, please contact me....

orthober@msoe.edu

Jeff Orthober, Assistant Professor, Milwaukee School of Engineering.

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I had the exact same problem already and my LCD is less than 8mo old. One of the techs from AKAI told me that its a known problem and many tv's were coming back "unserviceable". They now have a "supposed" fix for the problem. I only hope it really works and its not just a "carry-over" until the warranty ends. I am beginning to think its a quality issue and the units may just be defective. Thismay be thier way of doing a quick-fix vs. recalling all those tv's. This is what he gave me to as a solution to give the serviceman when he comes to fix the LCD.

AKAI model LCT42Z6TM: If there is no image or a badly distorted image with horizontal static lines, usually with four boxes in all four corners of the screen, there is a possible fix for this. There are four capacitors on the main board that have been identified as the primary cause of this symptom. Replace the capacitors at location numbers C280, C302, C320, C323 - 100UF 35 VOLTS [dxh]

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This works like a charm. "Replace the capacitors at location numbers C280, C302, C320, C323 - 100UF 35 VOLTS." I purchased the capacitors, cost me $1.07. Changed them all, that was the hardest part, took hours just to locate them. Burnt myself a few times, but by midnight, it was like new. So if you don't mind, doing something that would cost you over $500 by a profesional, I can assure you that this solution works. Email me if I can help, csclarke@gmail.com.

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