NEC VT440 Service Manual page 46
Hide thumbs
Also See for VT440:
- User manual (42 pages) ,
- Installation data (8 pages) ,
- Specifications (2 pages)
Table of Contents
Advertisement
2. No RGB images are generated. (VIDEO system)
1
Are there video signals (R, G, B/Y, Cb, Cr) at TP3403 to 5?
YES
NO
2
Are there video signal inputs at Pin 30 (R), Pin 28 (G), and Pin 26 (B) of POMI?
NO
Check the POMI connector, poor soldering in I/O PWB, and the signal cable.
YES
Check Q1020 to 4 and the peripheral circuits.
3. No images are generated. (Sync system)
1
Is there a horizontal sync signal (in positive polarity) at TP3503?
YES
NO
2
Is there a horizontal sync signal (in positive polarity) at Pin 111 of IC3401?
YES
NO
3
Is the input signal for VIDEO or DVD?
YES
NO
4
Is there a horizontal sync signal (in positive polarity) at Pin 83 of IC3301?
YES
NO
5
Are there signals at Pin 4 (SOG), Pin 6 (H), and Pin 8 (V) of IC1006?
YES
NO
6
Are there signal inputs at Pin 28 (SOG), Pin 24 (H), and Pin 22 (V) of POMI?
NO
Check the POMI connector, poor soldering in I/O PWB, and the signal cable.
YES
Check Q1025 to 34, Q1000, Q1013 to 6, and the peripheral circuits.
7
Is there a horizontal sync signal (in positive polarity) at Pin 86 of IC3301?
YES
NO
8
Is there a horizontal sync signal (in positive polarity) at Pin 19 of IC1104?
YES
NO
9
Are there video signals (sync provided) at Pin 41 (VIDEO) and Pin 43 (DVD) of IC1104?
YES
NO
0
Is the input signal for VIDEO?
YES
NO
Check IC3401 and the peripheral circuits.
@
To
.
Check IC3401 and the peripheral circuits.
7
To
.
Check IC3301 and the peripheral circuits.
Check IC1006 and the peripheral circuits.
Check IC3301 and the peripheral circuits.
Check IC1106 and the peripheral circuits.
Check the power supply of IC1104, I
0
To
, No VIDEO images.
TROUBLESHOOTING
2
C bus, and the peripheral circuits.
4-6
- Quick Links:
- Lcd Projector
- Power/ Status Light Messages
Hide quick links:
Advertisement
Chapters
Table of Contents
Troubleshooting
