Toshiba 42H81


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Toshiba 42H81

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Total
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Nov 20, 2011, 4:51 AM

Post #1 of 23 (2579 views)
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Toshiba 42H81	Can't Post

Hello : Nice forum here , I have a Toshiba 42H81 that I have changed the 2 convergence chips , I'm pretty sure that the 6 resistors are orange , white , gold , gold 2.7 ohms (see picture / link ) http://www.extremetesting.tv/resistors01.jpg . Is that the correct value ? thanks people <br>

I was looking at the lens , and look dusty - Best way to clean those also ?

(This post was edited by Total on Nov 20, 2011, 5:30 AM)

jts1957
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Nov 20, 2011, 12:34 PM

Post #2 of 23 (2569 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

2.7ohms 5%: Red, violet, gold, gold.

3.9 ohms 5%: Orange, white, gold, gold.

And the ones in the picture:
1.8 ohms 5%: Brown, gray, gold, gold.

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Location: Far, Far Away

Total
New User

Nov 20, 2011, 7:00 PM

Post #3 of 23 (2566 views)
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Re: [jts1957] Toshiba 42H81 [In reply to]	Can't Post

thanks - I took two new pictures are those the resistors that I need to change for the convergence ? looks like 6 - 1.8 ohm - 2 watt (after your help) .. Any Idea how to clean the lens , thanks for the help .

(This post was edited by Total on Nov 20, 2011, 7:04 PM)

jts1957
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Nov 20, 2011, 7:31 PM

Post #4 of 23 (2558 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

Windex and soft rag?

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Total
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Nov 20, 2011, 7:56 PM

Post #5 of 23 (2552 views)
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Re: [jts1957] Toshiba 42H81 [In reply to]	Can't Post

<span contenteditable="false"><table border=0 cellpadding=0 cellspacing=0 width="100%"><tr><td width="2%"><hr width="100%" noshade size="1" color="#A1A576"></td><td width="10%" align=center><font size=1 face="Verdana,Arial,Helvetica">In Reply To</font></td><td width="87%"><hr width="100%" noshade color="#A1A576" size=1></td></tr></table></span><div style="margin-left: 30px">Windex and soft rag?</div><span contenteditable="false"><table border=0 cellpadding=0 cellspacing=0 width="100%"><tr><td><hr width="100%" noshade size=1 color="#A1A576"></td></tr></table></span>

thanks , will clean the lenses , and those are the correct resistors to change ?

74f100
Enthusiast

Nov 20, 2011, 7:58 PM

Post #6 of 23 (2551 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

One additional note on that TV.

There are 2 small jumpers in the corner of the convergence pcb. If you have the chassis in service position, they will be in the upper left corner of the pcb. They supply the drive voltage for the convergence amps. Check them very closely for cold solder, they will break out of circuit and then blow a 2 amp and a 5 amp pico fuse.

Just something to check while working on it.

Jim
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Total
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Nov 20, 2011, 8:12 PM

Post #7 of 23 (2547 views)
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Re: [74f100] Toshiba 42H81 [In reply to]	Can't Post

checked and resoldered the 2 jumpers - they looked good . The problem with the tv right now is that the screen looks warped in the middle section . If I do the one touch focus - no errors at all .. Is there a way to reset the tv back to the factory settings ? Thanks for the help - appreciated .. <br>

(This post was edited by Total on Nov 20, 2011, 8:13 PM)

Total
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Nov 20, 2011, 10:38 PM

Post #8 of 23 (2540 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

the screen looks warped in the center . Any ideas how to adjust this ?

74f100
Enthusiast

Nov 21, 2011, 4:19 AM

Post #9 of 23 (2529 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

Look around for a service manual for the TV. The procedure should be there to explain how to do it, and how to save the settings.

Jim
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Total
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Nov 21, 2011, 4:35 AM

Post #10 of 23 (2528 views)
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Re: [74f100] Toshiba 42H81 [In reply to]	Can't Post

I downloaded the service manual , the only thing that I can find is :

In the manual - INITIALIZATION OF MEMORY DATA OF QA02
After replacing QA02, the following initialization is required.
1. Enter the service mode, then select any register item.
2. Press and hold the RECALL button on the Remote, then press the CHANNEL s button on the TV. The initialization of QA02
has been complated.
3. Check the picture carefully. If necessary, adjust any adjustment item above.
Perform “Programming Channel Memory” on the owner's manual.
CAUTION: Never attempt to initialize the data unless QA02 has been replaced.

74f100
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Nov 21, 2011, 5:11 AM

Post #11 of 23 (2526 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

Look for a geometry adjustment procedure. That will set green correctly, thus aligning blue and red.

I'll see if I can find anything on it tomorrow.
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Total
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Nov 21, 2011, 5:17 AM

Post #12 of 23 (2524 views)
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Re: [74f100] Toshiba 42H81 [In reply to]	Can't Post

In Reply To

Look for a geometry adjustment procedure. That will set green correctly, thus aligning blue and red.

I'll see if I can find anything on it tomorrow.

thanks - much appreciated .Will check tomorrow evening . Total

74f100
Enthusiast

Nov 22, 2011, 4:33 AM

Post #13 of 23 (2508 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

I looked through my service center literature. They dropped your model from the information.

That really sucks, I still work on them quite a bit.
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Ron.M
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Nov 22, 2011, 8:49 PM

Post #14 of 23 (2502 views)
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Re: [74f100] Toshiba 42H81 [In reply to]	Can't Post

74f100;....

I ran into that model before & had a problem trying to get the manual.....
I did find a manual for a "50H81" that should be of help with his problem...
I presume the convergence adjustments would be the same even tho there is a difference in the screen sizes...
You're welcome to give it a try....

http://servicetron.com/toshiba-2.html

Scroll down the page till you see 50H81 & click on it...
Your download will start....
It's a 16 MB file...

GOOD LUCK.... Sly

....

Have a GREAT day & week.... Sly

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

...
Veteran & Retired TV technician

74f100
Enthusiast

Nov 22, 2011, 11:33 PM

Post #15 of 23 (2497 views)
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Re: [Ron.M] Toshiba 42H81 [In reply to]	Can't Post

Thanks Ron!!!!

That is an awesome TV, and I would hate to have to give up on one. I also believe the H82 series are the same.
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Total
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Nov 24, 2011, 1:13 AM

Post #16 of 23 (2486 views)
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Re: [74f100] Toshiba 42H81 [In reply to]	Can't Post

I can't find any menu that will adjust the warpage :(

74f100
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Nov 24, 2011, 3:18 AM

Post #17 of 23 (2482 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

It will be either under a geometry setting or green convergence.

When I have a chance to really look over a manual, I'll let you know. The holidays are a very busy time for us, sorry.
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Total
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Nov 25, 2011, 2:54 AM

Post #18 of 23 (2473 views)
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Re: [74f100] Toshiba 42H81 [In reply to]	Can't Post

appreciated :) Will wait ..

74f100
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Nov 30, 2011, 2:30 AM

Post #19 of 23 (2443 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

I wasn't able to come up with anything at work on this.

Look at the manual Ron provided. Page 13 has the full convergence alignment. Align Green.

Touch focus "should" bring blue and red to green.

If not, complete that full procedure for a 3 colors.

Pay VERY careful attention to the save procedures, it is very easy to erase the convergence eprom. So follow the procedure EXACTLY....And don't ask why I know this....LOL

Jim
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Total
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Dec 3, 2011, 5:17 PM

Post #20 of 23 (2419 views)
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Re: [74f100] Toshiba 42H81 [In reply to]	Can't Post

thanks - will try this ..

Total
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Dec 4, 2011, 3:37 AM

Post #21 of 23 (2409 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

Thanks - I got the convergence issue fixed - Another weirdness - when I first turn on the tv , the screen is all distorted , for around 5 minutes then it looks 100 % . this happens every time I turn on the tv . Bad cap maybe ? ideas where to check ?

ZIANA123
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Dec 9, 2011, 5:02 AM

Post #22 of 23 (2387 views)
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Re: [Total] Toshiba 42H81 [In reply to]	Can't Post

THANKS FOR THE POST

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[url="http://www.2004fordf150.net"]2004 ford f150

Total
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Dec 9, 2011, 5:04 AM

Post #23 of 23 (2385 views)
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Re: [ZIANA123] Toshiba 42H81 [In reply to]	Can't Post

????

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