Question about Zenith C27A24T 27" TV

1 Answer

Dark picture after storm.

I have a zenith c27a24t 27" that was working great until a storm. After that the picture was really dark but the menus are still bright and the sound is fine. Tv was hooked up to the coax input at the time so I tried the component and s-video but had the same problem. From how good the menus look I assume the tube is fine. Bad input board? Or could I get away with soldering in a new part or two? Thanks!

Posted by on

  • 6 more comments 
  • Len Gagliardi
    Len Gagliardi Nov 12, 2008

    I guess I should give a better explanation as to what happened. The tv was hooked up to cable. I was watching tv one night during a lightning storm. Apparently one of the telephone poles got hit and sent a surge through the cable. My other tv had a surge protector on the incoming line but this one didn't. Anyway there was a flash and the picture went dark. I thought it blew out the tube, but when I pushed the menu button, it came on with all the color and bightness that it always had. So, went to the video menu and turned up the bightness all the way and the picture was there. It's just dull and doesn't have very vivid color. Kind of like when you turn it up all the way on a working set, just not not very bright. It seems like everything is working great on it except for the inputs. I turned the screen up all the way to help brighten it a little more. It's still not enought though. Now by the neck board, do you mean the one on the back of the tube? There's that one and the main board. I have a digital multimeter and alot of experience soldering but don't know to much about tv's :) I can post some pics of what the tv's doing if that would help. Or maybe the inside of the tv. Thanks so much for all your help!!!

    Len

  • Len Gagliardi
    Len Gagliardi Nov 12, 2008

    I just noticed that without the brightness turned up you can still see the pic but it's just kinda dark. When you hit the menu button while its set like this, The screen goes almost black but the menu is bright. Does that sound like a voltage problem like you were saying? Thanks again!

    Len

  • Len Gagliardi
    Len Gagliardi Nov 13, 2008

    With the brightness and screen up all the way, the picture doesn't seem to be affected with the menu on the screen.

  • Len Gagliardi
    Len Gagliardi Dec 04, 2008

    Well I found the three resistors on the c-board you were talking about. The big green ones. I pulled them out and tested them. According to the color code they are 15,000 ohm +/- 5%. They all tested at 14,800, so it looks like they are good. I found two 363.6 ohm resistors on the main board that had a what looked like a cooked spot on the board. Thought they coulda been bad but they also tested good. I checked all the solder joints but they all seem good too. Thanks for your help so far. Let me know what I should check next :)

    Len

  • Len Gagliardi
    Len Gagliardi Dec 04, 2008

    This jungle ic, is this the long one marked video processor (icx2200) or one of the heavy gauge deals that are bolted to the heat sinks? About those c-board resistors, I found 8 or 9 smaller pink ones and a couple small yellows. I just unplugged so I'll test them in a couple hours so it drains off a bit :) Now screen vr, you mean the knobs for screen and focus? If so they're on the transformer, but something tells me that isn't what you mean. Sorry I'm new to the tv repair bit but I'm learning! Thanks for your patients.

    Len

  • Len Gagliardi
    Len Gagliardi Dec 05, 2008

    Welp I finished testing all 16 resistors on the c-board and everything checked out there. I went ahead and resoldered all the joints on that board. Then I moved down to the main board and re did all the ic's, trans and everyother stop that looked like it may need it. Ok my jungle is a toshiba TA1268N. I found it on ebay for 4.85 so that doesn't sound to bad. As for the service manual, I WISH I had one! I've looked all over the web and can't seem to find it. The main board has 204-3341-06 (CA) on it. The focus and screen are in the deflection transformer in the rear or the main board. So from the way it's sounding, I need to order up a new processor (jungle)? Thanks so much for all your time and help!!

    Len

  • Len Gagliardi
    Len Gagliardi Dec 05, 2008

    Thank you! Hopefully I can return the favor maybe with helping you out with a car problem or something. Just let me know!

    Len

  • Len Gagliardi
    Len Gagliardi Dec 17, 2008

    Welp, I got the new jungle yesterday and soldered it in. Guess what? IT WORKED!!! Crystal clear picture! I'm obviously using some caps that I haven't used in a couple years. I got a slight high pitch sound coming from the area of the y/c that fluctuates with the picture. I figure I've probably got a couple bad caps that I'll have to replace sometime. Thanks so much for all your help!! I couldn't have done it without you!!!

    Len

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    New Friend:

    An expert that has 1 follower.

  • Expert
  • 99 Answers

Dark picture? hmm.
meaning there is no brightness variation, assuming this is the fault I think U might be having low screen voltage. Check for high value ( around 2W) resistor, preferably from 100K to 680K on the "C" board or neck board. Post back
Rifaa

Posted on Nov 12, 2008

  • 5 more comments 
  • Rifaa-ath Razei
    Rifaa-ath Razei Nov 17, 2008

    HMM!!

    A storm surge would probably blow the tuner to a script, I think hehehe. funny U have a dark picture.

    Nevertheless let's get cranking, the c board is the board connecting the tube to vedio amps and the focus plus screen voltages, it's typicaly a small pcb at the end of the tube, like I said first check the high value resistors after desoldering them, make sure u have the power cord disconnected. There will be two or three. aroung 2W carbon types.

    Pictures will be help ful. I can guide u very well then

    Happy hunting

    Rifaa

  • Rifaa-ath Razei
    Rifaa-ath Razei Dec 04, 2008

    Nope Len, those resistors the Collecttor Resistor of Video amps, there will 15K total of 3 resistors.

    The ones I said are no less than 100K but no more than 680K.

    Check for these colors codes on C board. brown, black, yellow or yellow, violet, yellow or blue, grey yellow. these are the values used for screen voltages.

    But first tell me where the screen VR is located. C board or on the FBT.

    Post back

  • Rifaa-ath Razei
    Rifaa-ath Razei Dec 04, 2008

    Here is another clue, if the menu is bright like u said then u have faulty Y/C jungle IC, try replacing that.

  • Rifaa-ath Razei
    Rifaa-ath Razei Dec 05, 2008

    YUP !!! the Y/C jungle is the video proc.

    Do U have service manual or not?

    and as for the VR, if focus and svreen is in the FBT then most likely the Y/C is faulty.

    With a schema I can pin point the fault..

  • Rifaa-ath Razei
    Rifaa-ath Razei Dec 05, 2008

    hold on ! Ihave the pin diagram for tht IC, let me check

  • Rifaa-ath Razei
    Rifaa-ath Razei Dec 18, 2008

    Music to my ears Len. Glad u got it fixed.

    As for the high freq. noise, it's probably a high voltage capacitor in the horzontal area. those 200 V ones, I think.

    Still if u continue to use the tv the noise could be an oscillation which might result in H out over heating. It just might blow the transistor, this has happened to me, so be careful.

    Cheers

  • Rifaa-ath Razei
    Rifaa-ath Razei Dec 18, 2008

    Music to my ears Len. Glad u got it fixed.

    As for the high freq. noise, it's probably a high voltage capacitor in the horzontal area. those 200 V ones, I think.

    Still if u continue to use the tv the noise could be an oscillation which might result in H out over heating. It just might blow the transistor, this has happened to me, so be careful.

    Cheers

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Zenith SL2773W problem


The dark rectangle appears because you have the closed captions on and set to TEXT. Closed captions set to CC1 puts the words on the screen and TEXT puts a black box on the screen. Go into the menu, navigate to the page with closed captions and set your captions to OFF.

Aug 12, 2007 | Zenith C27A24T 27" TV

1 Answer

Tv picture is shrunk to the middle of the screen and turns off


if you mean line across middle no vertical deflection prob circuit prob. need tech.

Dec 13, 2008 | Zenith C27A24T 27" TV

1 Answer

Picture getting dark


My jvc 27" tv was so dark I could hardly see any night scenes, even with the bright all the way on. If you push the sleep button, let go, then hold down the video and display (together), the service menu will come on. Scroll down to #7 (too dark) and adjust the brightness there. Works immediately. Good luck.

Nov 29, 2008 | JVC AV-27530 27" TV

1 Answer

Image goes off screen


it requires a TV repair person to fix the internal problems.

Jul 08, 2008 | Zenith C27A24T 27" TV

1 Answer

Zenith tv, storm elec. went off for a second


The storm might have damaged parts in the set. Have it serviced bya TV repairman

Jun 13, 2008 | Zenith C27A24T 27" TV

1 Answer

Picture is dark


sitnlisten - yes it does appear your pix tube is getting weak,but we may be able to turn up the flyback alittle to brighten up the picture.If you take the back off you will see the flyback-large black unit with a wire going to the round rubber cap on the back of the pix tube.Look at the flyback there are usually 2 adjusters one marked focus the other screen,just turn up the screen a little bit at a time.If you turn this up too much you will wind up with retrace lines on the screen.You may also want to check the pcboard ass'y for a sub bright adjust,and same thing small adjustments.If this don't help your pix tube may be too far gone.I hope this helps. cooltek Feb.1/08

Feb 14, 2008 | Zenith C27A24T 27" TV

1 Answer

Can't get channels to tune in


I remember the old system 3 chassie but am a little unsure what you are asking, please give me more info and i will try to help ya .

Jan 08, 2008 | Zenith C27A24T 27" TV

3 Answers

Picture is VERY dark...


zenith have many problems with crt (picture tube) they comes be short or one or more canon fail, there are nothing to do, replace the picture tube, and thats a lot of money for an old tv...good luck ps adjusting the screen and resoldering the picture tube card could help but remember there are many dangerous circuit in a tv...

Aug 10, 2006 | Zenith C27A24T 27" TV

Not finding what you are looking for?
Zenith C27A24T 27" TV Logo

Related Topics:

217 people viewed this question

Ask a Question

Usually answered in minutes!

Top Zenith Televison & Video Experts

The Knight
The Knight

Level 3 Expert

69610 Answers

matt martin
matt martin

Level 3 Expert

1198 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Zenith Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...