Toshiba 30HF84


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Toshiba 30HF84

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luke9511
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May 20, 2014, 11:00 PM

Post #1 of 9 (1543 views)
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Toshiba 30HF84	Can't Post

hello everyone my girlfriends parents have this tv and when you first turn it on there is no picture and there is a hissing sound coming from the inside of the tv, if you turn it off and on a few times the picture is awesome and there is no hissing sound.

im thinking the problem is the flyback as i have seen problems kinda like that in arcade monitors and i want to just make sure thats what it is. thanks for all the help and advice!

also here is a recording i made of the noise if anyone wants to hear it and make their own judgement
http://www.mediafire.com/download/3975n6c2op5hld2/tv_noise.zip

jts1957
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May 21, 2014, 12:03 AM

Post #2 of 9 (1539 views)
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Re: [luke9511] Toshiba 30HF84 [In reply to]	Can't Post

Make sure the anode cap is not damaged and is seated correctly.
Or it could be a bad joint or a capacitor that's arcing.

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

luke9511
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May 30, 2014, 7:28 PM

Post #3 of 9 (1460 views)
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Re: [jts1957] Toshiba 30HF84 [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">Make sure the anode cap is not damaged and is seated correctly. <br>Or it could be a bad joint or a capacitor that's arcing.</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>

i desolder some of the caps and tested them with my digital multimeter and they tested fine, i had my fiancee listen and she pointed to where the HOT is or around the power fet, is there a way i can test this fet to make sure its still good and is it possible for it to be semi bad to where its working enough to turn on the tv but working poorly enough to cause issues?

jts1957
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May 30, 2014, 7:37 PM

Post #4 of 9 (1459 views)
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Re: [luke9511] Toshiba 30HF84 [In reply to]	Can't Post

Testing caps or other parts randomly usually is slow in identifying the defective one(s)

You DO have an active signal / source connected so that you can answer the question of whether or not it has any sound (music/voice) from any source?

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

luke9511
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May 30, 2014, 7:38 PM

Post #5 of 9 (1457 views)
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Re: [jts1957] Toshiba 30HF84 [In reply to]	Can't Post

yes picture is ok and sounds fine but i dont leave it on for long due to that sound

(This post was edited by luke9511 on May 30, 2014, 7:39 PM)

jts1957
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May 30, 2014, 7:50 PM

Post #6 of 9 (1451 views)
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Re: [luke9511] Toshiba 30HF84 [In reply to]	Can't Post

Is the anode cap seated correctly? (Careful you don't get knocked on your a$$ - discharge 1st with set unplugged)

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Location: Far, Far Away

luke9511
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May 30, 2014, 7:53 PM

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Re: [jts1957] Toshiba 30HF84 [In reply to]	Can't Post

yes that was one of the first things i checked, like i said there some sort of whine or hissing sound coming from the area where the HOT is but i dont see anything that is damaged

jts1957
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May 30, 2014, 8:18 PM

Post #8 of 9 (1447 views)
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Re: [luke9511] Toshiba 30HF84 [In reply to]	Can't Post

Try it in the dark and see if you see anything blue/violet around cap or flyback (or anywhere else).

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

(This post was edited by jts1957 on May 30, 2014, 8:18 PM)

luke9511
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May 30, 2014, 8:19 PM

Post #9 of 9 (1444 views)
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Re: [jts1957] Toshiba 30HF84 [In reply to]	Can't Post

nope nothing, just that sound is all i hear

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