toshiba white horizontal line and intermittent audio


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toshiba white horizontal line and intermittent audio

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mike03
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May 3, 2012, 11:14 PM

Post #1 of 34 (4308 views)
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toshiba white horizontal line and intermittent audio	Can't Post

When the tv turns on for the first time there intermittent audio for about 3 seconds with a white horizontal line across the screen after the 3 seconds the line and the audio disappears and leaves a small round dot in the middle of the screen.
MK

jts1957
Veteran

May 4, 2012, 12:26 AM

Post #2 of 34 (4304 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

I know my eyesight is getting bad. Can't quite discern the identity of the toshiba in question. Unimpressed

-------------------------
Location: Far, Far Away

Ron.M
Veteran

May 4, 2012, 12:30 AM

Post #3 of 34 (4300 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

mike03;...

You've been coming here long enough to know that our psycic abilities have been stolen....
I/we can not even guess what your solution is WITHOUT A MODEL/CHASSIS NUMBER !!!!...

I really thought you knew better.... Unsure

....

Later...Ron.M.... Cool

...
Veteran & Retired TV technician

mike03
New User

May 4, 2012, 12:30 AM

Post #4 of 34 (4299 views)
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Re: [jts1957] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Model CF-19E22
MK

Ron.M
Veteran

May 4, 2012, 5:52 PM

Post #5 of 34 (4285 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

mike03;...

You may have a fried vertical output IC & other parts associated with it...
Slim to none chance it could be bad connections on that IC , but it's worth a looksee...
Can't find a manual for that one either !!!!

Later....Ron.M.... Cool

...
Veteran & Retired TV technician

(This post was edited by Ron.M on May 4, 2012, 5:53 PM)

mike03
New User

May 6, 2012, 6:14 AM

Post #6 of 34 (4272 views)
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Re: [Ron.M] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Change the vertical ic and tested the resistors and transistors all fine.I change the caps and re-did the joints followed by a continuity test but the circuit behaves the same any other ideas?After pressing the power button a few times i noticed the picture would come up but went away after about 5sec.and then nothing more from the screen.
MK

Ron.M
Veteran

May 6, 2012, 4:29 PM

Post #7 of 34 (4267 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

mike03;.....

Check for B+ supply voltage from flyback secondary to vertical output IC....
Supply resistor from flyback should be around 2.2~4.7 ohms @ 1/4~1/2 watt...
It may be open...
What is the IC type (Generic number) that set is using for vertical output ????...

Later...Ron.M.... Cool

...
Veteran & Retired TV technician

mel
Veteran

May 6, 2012, 11:11 PM

Post #8 of 34 (4263 views)
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Re: [Ron.M] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Ron
It's R327 6.8 ohms 2 watt of of pin 6 of the flyback. I'm not sure why a vertical problem would cause audio and the TV to shut down. I more suspect a power supply failure.
Mike 03

I have the SAMs Photofact for that model and we can walk thru some steps to try to isolate the fault. First, I need to know if the set completly shuts down or just some functions. If the former, check the voltage across C884 and C448. They should be 115 volts.

mike03
New User

May 7, 2012, 11:59 AM

Post #9 of 34 (4257 views)
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Re: [mel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Ron the vertical ic # is TA8403K. I tested R327 which has a value of 8.2 ohms.and it reads fine.I tested the volt at c884 and got a reading of 105 volts which i think may be o.k,c448 has a fluctuating reading of 60 volts and 0 volts at times so the voltage source for c448 is probably shutting down the set.
MK

Ron.M
Veteran

May 7, 2012, 4:31 PM

Post #10 of 34 (4251 views)
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Re: [mel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

mel;.....

The reason I suspected a vertical problem has to do with no vertical pulse going to the micro causing a shutdown to protect from a CRT burn....
I've seen "protect circuits" kick in to save the CRT...
The audio goes when the horiz pulse stops , thereby causing the audio B+ to cease which may/may not be coming from the flyback....
Even tho this is a 19" set & I do not have the manual , that seemed like a possible problem.....
Since you do have the manual , I'll watch.....

BTW:...
6.8 ohms @ 2 watts seems like overkill for that size TV...
I'm NOT challenging your info , just Toshiba's ....

Have a GREAT day & week.... Sly

....

Later....Ron.M.... Cool

....
Veteran & Retired TV technician

mel
Veteran

May 7, 2012, 7:26 PM

Post #11 of 34 (4246 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Mike03
OK 8.2 ohms is shown as an alternate for R327 so we are good there. The schematic also shows an alternative of R101 attached to the hot side of F470 or the down side. If attached to the hot side, pull the fuse and check the voltage across C101 for 33 volts. If attached to the downside, make sure that the fuse is not open. Also check R470 for .75 ohm 2 watt for ohms and solder joints. The fact that it fires up and then shuts down puzzles me. Post back with what you find.

Ron
If it helps, the chassis is TAC 9500 or TAC 9501. It applies to model number CF13E22/23, CF19E22, CF20E26, and CL14E26

jts1957
Veteran

May 7, 2012, 8:57 PM

Post #12 of 34 (4245 views)
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Re: [Ron.M] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Think I found MOST of the "schematic"

http://search.4shared.com/...2-cf13e23-cf19e.html

-------------------------
Location: Far, Far Away

Ron.M
Veteran

May 8, 2012, 12:35 AM

Post #13 of 34 (4240 views)
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Re: [jts1957] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

jts1957;......

After jumping thru more hoops than Larry Byrd &/or Magic Johnson , I can not get that dam manual....
1st , I had to join , which I did...
I had to give them my email address , which I did....
The site then said ""My email address was invalid....
So I gave them my other email address...
After some screwing around , my 2nd email address was finally accepted & verified !!!!....
I finally got to try to download the file & whaddayouknow ???
This is what appeared;=>....
"""Sorry, the file link that you requested is not valid.
Reasons for this may include:

Invalid link
The file has been deleted because it was violating our Terms of use"""

The above may appear here;=>...
http://www.4shared.com/...e.html?cau2=403tNull

So you apparently have the magic touch...
NO pun intended.... Unsure

....

I'll watch.... Unimpressed

...

Later...Ron.M.... Cool

....
Veteran & Retired TV technician

mel
Veteran

May 8, 2012, 1:39 AM

Post #14 of 34 (4237 views)
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Re: [Ron.M] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

I gave up on that site some time ago.

alanretel
New User

May 8, 2012, 7:26 PM

Post #15 of 34 (4224 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

I have a friend that had a similar problem some time ago: I remember that he consulted with his tech www.tvrepairjacksonvillefl.com and he found: a very very high frequency that could be regulated inside the TV. Now I�m not really sure that it is the same problem as yours because my friend TV had horizontal white lines and a rare noise also. I consider you must look for professional opinion.

mel
Veteran

May 8, 2012, 7:40 PM

Post #16 of 34 (4222 views)
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Re: [alanretel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

alanretel
He must seek professional help?????????????? What the hell do you think that he is doing here? Since I've had my own shop for more than 50 years, i kinda consider myself a professional.

mike03
New User

May 11, 2012, 6:46 AM

Post #17 of 34 (4203 views)
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Re: [mel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

c101 is fine reads 32 volts. fuse 301 is blown that happened after i put in the new vertical ic cause i tested it before.I just replace it the line gets a little wider but cant keep steady.Then the line appears no more after i restart the tv. i now have a dark screen
MK

mel
Veteran

May 11, 2012, 10:02 PM

Post #18 of 34 (4197 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

I suspect that your new vertical IC has also blown causing the F301 to blow. The only components that are in the B+ power supply to the vertiical IC are D302, C310, F301, D301 and C308. When the set on turned on but blank screen, check for 115 volts across C884 and C448, with F301 pulled, check for 26 volts across C310 and post back results.

mike03
New User

May 18, 2012, 9:41 PM

Post #19 of 34 (4153 views)
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Re: [mel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

I tested d302 replace c310 and 308. I did the test with f301 fuse removed with dark screen.The results are c884=0v c448=0v and c310=33v. The same test i did a while back with white line across screen has all the correct voltage across each component.
MK

mel
Veteran

May 18, 2012, 10:17 PM

Post #20 of 34 (4148 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Check the resistance across C884 and C448.

mike03
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May 18, 2012, 11:03 PM

Post #21 of 34 (4145 views)
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Re: [mel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

how do i do that test ?
MK

mel
Veteran

May 19, 2012, 1:27 AM

Post #22 of 34 (4140 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Black lead of ohm meter on negative and red lead on positive post of the capacitor.

mike03
New User

May 19, 2012, 3:26 PM

Post #23 of 34 (4134 views)
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Re: [mel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

I change both of them .Still nothing
MK

jts1957
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May 19, 2012, 6:53 PM

Post #24 of 34 (4132 views)
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Re: [mel] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

Houston, we have a (comprehension) problem. Wink

-------------------------
Location: Far, Far Away

mel
Veteran

May 19, 2012, 8:06 PM

Post #25 of 34 (4128 views)
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Re: [mike03] toshiba white horizontal line and intermittent audio [In reply to]	Can't Post

CHECK THE RESISTANCE and post back what you find. If you can't follow instructions, I can't help you Frown

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