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



Joined: 06 Dec 2010
Posts: 39
Location: Wisconsin

PostPosted: Tue Feb 08, 2011 11:37 pm    Post subject: Reply with quote

I know this has to be frustrating for you,
cause it is really frustrating for me.

I can't see the foil clearly enough to follow it,
because there is too much printing in that area of the board.

RA34 is right next to the Micro...
I see that,
but I still can't find CA34 anywhere.
Google

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JTS1957



Joined: 21 Jan 2009
Posts: 2364
Location: Far, Far Away

PostPosted: Tue Feb 08, 2011 11:50 pm    Post subject: Reply with quote

Shine a strong (BRIGHT) flashlight from opposite side of board.
thattoddguy



Joined: 06 Dec 2010
Posts: 39
Location: Wisconsin

PostPosted: Wed Feb 09, 2011 12:08 am    Post subject: Reply with quote

Wow that make a huge difference...Thank You!!
I can actually see where everything is going.

The only problem is that the foil goes from Pin 34 to one side of RA34 and nowhere else.
I still can't see the CA34.

Could it be that this model TV doesn't have a CA34?
JTS1957



Joined: 21 Jan 2009
Posts: 2364
Location: Far, Far Away

PostPosted: Wed Feb 09, 2011 12:58 am    Post subject: Reply with quote

Correct. As I mentioned near the start, I am using a "similar" set's service literature.
thattoddguy



Joined: 06 Dec 2010
Posts: 39
Location: Wisconsin

PostPosted: Wed Feb 09, 2011 1:02 am    Post subject: Reply with quote

First of all...
Don't you sleep?

Secondly...
and I hate to say this, but...
Does this mean the TV should be put to rest?
Google

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JTS1957



Joined: 21 Jan 2009
Posts: 2364
Location: Far, Far Away

PostPosted: Wed Feb 09, 2011 11:40 am    Post subject: Reply with quote

You appear to be regaining a reset voltage by floating a terminal on the standby regulator. This usually means that something that is connected to the same terminal is loading it down / shorting it out. So far we've found one difference in the schematic I'm using (there may be more). The schematic shows only 5 (now 4) things connected to this terminal.
I think it's about time to try another regulator.
thattoddguy



Joined: 06 Dec 2010
Posts: 39
Location: Wisconsin

PostPosted: Wed Feb 09, 2011 1:01 pm    Post subject: Reply with quote

I'm a little confused..
what do you mean when you say:

Quote:
I think it's about time to try another regulator.
JTS1957



Joined: 21 Jan 2009
Posts: 2364
Location: Far, Far Away

PostPosted: Wed Feb 09, 2011 4:53 pm    Post subject: Reply with quote

This shouldn't be this hard.
See if you have the SAME circuit/locations/values etc.

Starting at the Microprocessor (ICA01) pin #34, you should encounter a 1000 ohm resistor (RA34). That is the ONLY thing connected to pin 34. Lift (float) one side and confirm it reads approximately 1000 ohms. Leave it lifted.
Going to the non-pin34 side of RA34 you should come to the following: Pin #4 of Q840, a 5600 ohm resistor (R841) and a 47000 ohm resistor (R843). That should be all that connects together at that point. Lift one side of these two resistors and make sure they read approximately the values given. Leave them lifted.
Measure resistance pin #34 of microprocessor to tuner case ... Measure resistance pin #4 of Q840 to tuner cover.
Note any discrepancies.

Are the circuit / location numbers / values as stated above?
Pin 34 & pin 4 readings?
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