Philips DVD634 Service Manual page 17

Diagnostic Software, Trouble Shooting and Test Instructions
5.3 Fault Finding Trees
5.3.1 No Operation
The player does not operate
No OSD and FTD display
No pix and sound
Put the Mains switch to ON
Check Power
supply +5V and
+/-12V to the
Mpeg board
YES
Check Power
supply +3V3 and
+2V5 to IC 7101
board
YES
Check RESET
signal at pin 24 /
7101 and pin 12 /
7100
YES
Check 27MHz clk
input at
pin 105 /116 /117
of IC 7101
YES
Check SDRAM
CLK 108MHz at
pin 38 / 7102
YES
Measure waveform at pin 16 of Flash
IC 7100 at Power-on and the waveform
should look like in Fig A:
•
During initialization –waveform
appear for 1 sec and go low for next 1
sec.
•
After start-up-continuous waveform.
Is the waveform
present ?
YES
•
Check / Replace processor IC 7101
•
Check supply voltages at connector
1202
è
Pin 1&3 +5V
è
NO Pin 5 +12V
è
Pin 7 -12V
•
Check / Replace cable connection to
con 1202
•
Check / Replace Power Supply Unit
•
Check / Replace safety resistor 3200
•
Check / Replace 3V3 regulator 7206
NO
and transistor 7220
•
Check +5V supply to IC 7230
•
Check / Replace RESET IC 7230
NO
•
Check +5V supply voltage to IC 7104
•
Check / Replace IC 7104
NO
•
Check / Replace crystal 1153
•
Check / Replace C2140 and C2141
•
Check / Replace resistor
3145,3146,3147 3148 and 3150
•
Check +3V3 supply voltage to IC
7102
NO
•
Check / Replace resistors 3171
•
Check / Replace processor IC 7101
Note: There should be mechanical
Fig A
PM3380B
ch1
T
1
1.00V / DC
200ms / div
•
Check +3V3 supply voltage to IC
7100
NO •
Check / Replace jumper 4109
•
Check / Replace Flash IC 7100
•
Check HSYNC at pin 10 / 7301
•
Check +5VAV supply to IC 7301
•
•
Check / Replace Video DAC IC 7301
CL 26532068_024.eps
Figure 5-1 No operation
DVD634 /0X1
RESET
ch1
ch2
T
1
2
2V / div DC
20ms / div
27MHz CLK
ch1
1
1V / div DC
50ns / div
SDRAM CLK
ch1
ch1: f req= 1 08MHz
1
1V / div DC
10ns / div
100702
5. EN 17