E
Eric Richards
Guest
Has anybody seen those stupid fault reports like;
Make: ABrand
Model:xyz123
Fault: will not rewind
Cure: Dry Joint at main micro
You must say there is something to be said about the people who would send
in the above fault report.
Over the past year or so I have used standard practice to fix TV or VCR and
made notes so next time I get a similar fault it speeds things up,
Below is page 1 of about 16 pages of basic information just enough to stop
me spending all day writing notes and not to take me away from fixing at the
work bench, included on the list is the odd truth table, the input & output
pin, and more important Vcc pins,
I sent this (it was a lot smaller, since then as I have added in more
information) into Silicon Chip and they could not understand it, that is why
I made up page 1, and sent it to number of other people but never get a
reply afterwards, I am confused, all my notes I keep at the bench makes me
recycle the time at the bench and stops me looking at other peoples pathetic
fault reports and stops me asking pathic question on Email groups like a lot
ot other people do
on those harder faults we get from time to time. sometimes my
notes has avoided me ordering a service manual r circuit diagram.
Then there is this note I could of used in the example how I mean will save
me time next time a get a color problem on a TV (that uses a TDA3560) and
wish to check the 4.4 MHz adjustment.
TDA3560
For color sync connect saturation input pin 6 to 12 Volts, Short pins 21 &
22, adjust crystal trimmer for floating color.
If anybody would like a list in *.pdf format (take it or leave it) about
200K in file size just send me a Email at erichards@clare.net.nz just
replace clear
++++++++++++++++++++++++++++
(Page 1 )About this list
This list start off as integrated circuits added to the list as I came to
them, at the work bench, just enough information was added to these pages to
get the television set working, notes were added to save on research next
time I had a similar problem, it is a move to get away from stupid fault
reports like "DEAD, replace R1234" and make the fault information more
universal and much more useful to any brand.
Take this next IC for example,
MC4403p Power 3 Output 50 Ohms[3&4] 11 K
16 pin DIP 4 Grd
I suppose it possible that the IC could have a low impedance output of 50
Ohms, but now I know it is 11K Ohms on a new IC, when I get to the next dead
power supply using a MC4403, I will check between pins 3 & 4 to decide if
the IC is good or bad, a faster method than any other.
Now take this next vertical output IC
AN5521 Vertical 2 Output 5-130 Ohms[1&2] 3Meg
7 pin SIP 1 Grd
This AN5521, I must have had a couple of faulty IC's of this type, one was
only 5 Ohms and another was 130 Ohms between pins 1 and 2.
This is how the plan works, you have a television that has a frame collapse
with out looking for the circuit diagram, you check the resistance between
pins 1 and 2, and the reading is very clear as to what you do next,
sometimes you might have to unsolder the pins to get a more accurate
picture.
But having just said I am only including IC's as I come to them, well I
told a little lie, I have included a few other Vertical output IC's that I
have not found faulty yet since starting the list, e.g. AN5515.
The page on the UC3842 series of IC's was a list I made a few years ago
for someone I once knew that fixed computer monitors.
It is interesting my first set back with these note came from a Vertical
output IC TDA8179S the data sheet said that pin 4 was ground, when the
circuit came for the TV it had pin 4 going to -17 Volts. So don't get fooled
like I did with a fusible resistor when the set does not work, if it says
"ground" do a pin to ground resistance check.
I would like to thank Paul Anderson ikon_images'at'techie.com very much,
without Paul's support I would not of continued to add in useful
information apart from the few IC's I found faulty
---
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Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.706 / Virus Database: 462 - Release Date: 14-Jun-04
Make: ABrand
Model:xyz123
Fault: will not rewind
Cure: Dry Joint at main micro
You must say there is something to be said about the people who would send
in the above fault report.
Over the past year or so I have used standard practice to fix TV or VCR and
made notes so next time I get a similar fault it speeds things up,
Below is page 1 of about 16 pages of basic information just enough to stop
me spending all day writing notes and not to take me away from fixing at the
work bench, included on the list is the odd truth table, the input & output
pin, and more important Vcc pins,
I sent this (it was a lot smaller, since then as I have added in more
information) into Silicon Chip and they could not understand it, that is why
I made up page 1, and sent it to number of other people but never get a
reply afterwards, I am confused, all my notes I keep at the bench makes me
recycle the time at the bench and stops me looking at other peoples pathetic
fault reports and stops me asking pathic question on Email groups like a lot
ot other people do
on those harder faults we get from time to time. sometimes my
notes has avoided me ordering a service manual r circuit diagram.
Then there is this note I could of used in the example how I mean will save
me time next time a get a color problem on a TV (that uses a TDA3560) and
wish to check the 4.4 MHz adjustment.
TDA3560
For color sync connect saturation input pin 6 to 12 Volts, Short pins 21 &
22, adjust crystal trimmer for floating color.
If anybody would like a list in *.pdf format (take it or leave it) about
200K in file size just send me a Email at erichards@clare.net.nz just
replace clear
++++++++++++++++++++++++++++
(Page 1 )About this list
This list start off as integrated circuits added to the list as I came to
them, at the work bench, just enough information was added to these pages to
get the television set working, notes were added to save on research next
time I had a similar problem, it is a move to get away from stupid fault
reports like "DEAD, replace R1234" and make the fault information more
universal and much more useful to any brand.
Take this next IC for example,
MC4403p Power 3 Output 50 Ohms[3&4] 11 K
16 pin DIP 4 Grd
I suppose it possible that the IC could have a low impedance output of 50
Ohms, but now I know it is 11K Ohms on a new IC, when I get to the next dead
power supply using a MC4403, I will check between pins 3 & 4 to decide if
the IC is good or bad, a faster method than any other.
Now take this next vertical output IC
AN5521 Vertical 2 Output 5-130 Ohms[1&2] 3Meg
7 pin SIP 1 Grd
This AN5521, I must have had a couple of faulty IC's of this type, one was
only 5 Ohms and another was 130 Ohms between pins 1 and 2.
This is how the plan works, you have a television that has a frame collapse
with out looking for the circuit diagram, you check the resistance between
pins 1 and 2, and the reading is very clear as to what you do next,
sometimes you might have to unsolder the pins to get a more accurate
picture.
But having just said I am only including IC's as I come to them, well I
told a little lie, I have included a few other Vertical output IC's that I
have not found faulty yet since starting the list, e.g. AN5515.
The page on the UC3842 series of IC's was a list I made a few years ago
for someone I once knew that fixed computer monitors.
It is interesting my first set back with these note came from a Vertical
output IC TDA8179S the data sheet said that pin 4 was ground, when the
circuit came for the TV it had pin 4 going to -17 Volts. So don't get fooled
like I did with a fusible resistor when the set does not work, if it says
"ground" do a pin to ground resistance check.
I would like to thank Paul Anderson ikon_images'at'techie.com very much,
without Paul's support I would not of continued to add in useful
information apart from the few IC's I found faulty
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.706 / Virus Database: 462 - Release Date: 14-Jun-04