1.2 No Picture
Check following steps.
Part 4: Troubleshooting
4-3
No picture with all of
input sources
Check signal processing stage and LCD driving stage;
Check RGB S&H signals at test points TPB1, TPB2, TPG1,
TPG2, TPR1, TPR2.
Check PSIG signals at test points TPPSIG and TPZPSIG.
Check power supply circuit 15.5V and peripheral circuit.
Check ICs IC501, IC531, IC561, IC2501, IC2531, IC401,
IC301 and peripheral circuits.
Check DVI interface stage;
Check IC201<A/D Conversion> and peripheral circuit.
Check DVI selection signals, PW_SCL1 and PW_SDA1.
No picture with PC1[DVI
digital] input source
No picture with PC1 [DVI
analog] input source
Check PC source selecting stage;
Check IC3061<RGB buffer> and peripheral circuit on the DVI
board.
Check IC1201<PC1/PC2 RGB SW> and peripheral circuit.
PC1/PC2_SW5 signal (PC1: L) is output from pin 15 of
IC2323<D/A> and applied to pin 26 of IC1201 through
IC5371<Buffer>.
Check PC source selecting stage;
Check IC221<Sync sw> and peripheral circuit on the AV
board. Check MNTOUT_SW5 signal (PC2-Monitor-Out:H) is
output from pin 16 of IC2323<D/A> and applied to pin 1 of
IC201 and pins 9, 10, 11 of IC221 on the AV board through
IC5371<Buffer>.
Check IC1201<PC1/PC2 RGB SW> and IC5311<PC1/PC2
SYNC-SW> and peripheral circuit.
PC1/PC2_SW5 signal (PC1: L) is output from pin 15 of
IC2323<D/A> and applied to pin 26 of IC1201 through
IC5371<Buffer>.
No picture with PC2 [VGA
analog] input source
Go to next page
Yes
Yes
Yes
No
No
No
No
Yes
Check PC/AV source selecting stage and processing stage;
Check IC5201<RGB/COMP-SW> and IC201<A/D
Conversion> and peripheral circuit.
PC/AV_SW5 signal (PC: H) is output from pin 13 of
IC2323<D/A> and applied to pins 10,11 of IC5301 through
IC5371<Buffer>.
COMPO5 signal (PC: H) is output from pin 14 of IC2323<D/A>
and applied to pin 26 of IC5201through IC5371<Buffer>.
No picture with all of
computer input sources
Yes
No
Summary of Contents for LV-7215U
Page 9: ...Part 1 General Information ...
Page 25: ...Part 2 Repair Information ...
Page 43: ...Part 3 Adjustment ...
Page 66: ...Part 4 Troubleshooting ...
Page 78: ...Part 4 Troubleshooting 4 12 AN5870 RGB SYNC SW IC1201 IC5201 BA7078 Sync Separator IC5341 ...
Page 80: ...Part 4 Troubleshooting 4 14 CXD3536 LCD Driver IC401 FA5502 P F Control IC621 ...
Page 81: ...Part 4 Troubleshooting 4 15 M62392 M62393 D A IC6271 IC281 ML60851 USB Driver IC9801 ...
Page 83: ...Part 4 Troubleshooting 4 17 TC90A69F Y C Separator IC2101 ...
Page 84: ...Part 5 Parts Catalog ...
Page 85: ......
Page 99: ...Part 6 Electrical Diagrams ...