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Toshiba TV CF3572B Start-Up Issue   Goto page 1, 2, 3 ... 9, 10, 11  Next  
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HammerDown



Joined: 18 Feb 2009
Posts: 47

PostPosted: Wed Feb 18, 2009 9:06 am    Post subject: Toshiba TV CF3572B Start-Up Issue Reply with quote

Having a 'cold' start-up issue. CF3572B made in 1993, great picture/sound.
Press the on/off button and it wants to start but goes dead...after that the on/off button does nothing.
If I pull the power plug then plug it back in a few times it will usually start.
Once it's running I can turn on/off all day/night. When is sits off overnight, again no cold start.

This TV has 3-circuit boards. Just for the heck of it I put a hair dryer on the far left board(power supply) for a few seconds and the TV would then start with the on/off button!
Local TV guy replaced 3 capacitors(no fix) and now says anything can be the problem. :roll:
Thanks for any feedback
Please see red circled part attached to heat sink...could this be the problem?

and one more below...
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HammerDown



Joined: 18 Feb 2009
Posts: 47

PostPosted: Sat Feb 21, 2009 8:49 am    Post subject: Reply with quote

30 views w/no replies...is this that tough of a fix?
Come on people >for a cold start, I'm using a hair dryer for 5 seconds to get this TV on :mrgreen:
Wendell1980



Joined: 30 Dec 2007
Posts: 74
Location: Cambridge, Ontario, Canada

PostPosted: Sat Feb 21, 2009 5:00 pm    Post subject: Reply with quote

pull the boards out and check for burnt or cracked soldier joints
kuhurdler



Joined: 28 Dec 2006
Posts: 2852
Location: Overland Park, KS

PostPosted: Sat Feb 21, 2009 6:22 pm    Post subject: Reply with quote

I agree.

Also, you've used the heat. Now start using the freeze spray. you can get them from any electronics part store or website.
JTS1957



Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away

PostPosted: Sat Feb 21, 2009 11:31 pm    Post subject: Reply with quote

Also try: C871 22ufd/63volt.
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HammerDown



Joined: 18 Feb 2009
Posts: 47

PostPosted: Sun Feb 22, 2009 8:12 am    Post subject: Reply with quote

JTS1957 wrote:
Also try: C871 22ufd/63volt.

Are you seeing this on one of my circuit boards?
HammerDown



Joined: 18 Feb 2009
Posts: 47

PostPosted: Sun Feb 22, 2009 8:21 am    Post subject: Reply with quote

Thanks for the suggestions about checking for, burnt or cracked soldier joints.
Question... being that, warmth from a hair dryer on my left circuit board for 15 seconds allows the TV to turn-on via on/off button...can I assume the problem is in fact on that "left" board?

Also...I could almost bet if my home thermostat was set to 75 degrees the TV would also cold start with no problems.
HammerDown



Joined: 18 Feb 2009
Posts: 47

PostPosted: Sun Feb 22, 2009 8:22 am    Post subject: Reply with quote

kuhurdler wrote:
I agree.

Also, you've used the heat. Now start using the freeze spray. you can get them from any electronics part store or website.


Please elaborate a bit on what the freeze spray test will show?
JTS1957



Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away

PostPosted: Sun Feb 22, 2009 2:11 pm    Post subject: Reply with quote

Near each part silk-screened on every board is a location number.

Looking up "CF3572B" in my repair database produced one result for "Intermittant turn on" with the location number/component value previously posted.

That's not to say that this part IS the cause of the failure in your case, but it's something you may want to check.
HammerDown



Joined: 18 Feb 2009
Posts: 47

PostPosted: Sun Feb 22, 2009 2:44 pm    Post subject: Reply with quote

JTS1957 wrote:
Near each part silk-screened on every board is a location number.

Looking up "CF3572B" in my repair database produced one result for "Intermittant turn on" with the location number/component value previously posted.

That's not to say that this part IS the cause of the failure in your case, but it's something you may want to check.

Gottcha, I had thought the other poster actually saw that number on my board...guess I better dig out the magnifying glass and go hunting!
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