General information
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Job Number |
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0303-75 |
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Equipment type |
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VCR |
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Maker + Model # |
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Panasonic NV-J20AM |
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Made in |
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Date in |
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Sun.30.Mar |
2003 |
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Date of repair |
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Sun.6.Apr |
2003 |
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Date out |
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Wed.09.Apr |
2003 |
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Comments |
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Symptoms observed
BAD |
1 |
Completely Dead, not even power red LED on switch on |
Repair notes
Full repair description and observations |
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1 |
The power supply was
first analysed, since the fault is most probably there. The fuse was not
blown and the 240V ac were present up to the rectifying IC. |
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2 |
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3 |
Following the track, the
–ve side of the capacitor was a burnt resistor, about 2W from its size, and
still visible the markings stated 2.2Ohms. This was of course found open. |
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4 |
Following further the
track, the real problem was found: IC STRD 1816 (5 pin) was short circuit. |
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5 |
Both the IC and the
resistor was replaced, and also replaced 2 other
capacitors which I read that it may have casued the IC to blow. These were a
47uF/50V (C??) and a 2.2uF/450V (C9). I powered up and everything went
smooth. |
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Repair summary |
IC STRD1816 SHORT CIRCUIT (and
Protective Resistor o/c) |
Precautions, fouls and advises |
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1 |
N/a |
Other measurements and technical comments
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1 |
These are the voltages
found on stop mode, given by the power supply o/p cable: |
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Pin 1 |
-29.0V |
Pin 6 |
5.0V |
Pin 11 |
6.7V |
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Pin 2 |
-25.2V |
Pin 7 |
5.4V |
Pin 12 |
12.3V |
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Pin 3 |
-29.2V |
Pin 8 |
0.0V |
Pin 13 |
45.5V |
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Pin 4 |
0.0V |
Pin 9 |
12.2V |
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Pin 5 |
0.0V |
Pin 10 |
15.8V |
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