Repair Instructions - Philips MRD300/37 Service Manual

REPAIR INSTRUCTIONS

A B
ALL FUNCTION VFD DISPLAY
NO WORKING NO SHOW
AND KEY FUNCTION
A
ALL FUNCTION
NO WORKING
NO
CHECK ALL SYSTEM
YES
ALL CABLE IS LOOSE
OR BAD INT
NO
PANEL STANDBY LED
YES
SHOW WORKING
OR NOT
CHECK IC902 PIN3=+5V
NO
CHECK IC904 PIN 3=3.3V
CORRECT
CHECKALL VOLTAGE
NO
3.3V AND 5VGIVE
CIRCUIT
2-2
PILIPS MRD300 REPAIR CHART
MAIN UNIT REPAIR CHART
C D
DVD POWER SUPPLY AUDIO OUTPUT
NO SOUND NO WORKING
RE-INSERT AND FIX
THE CABLE
CHECK BACK POWER
BAD
PCB F901 BAD CAUSE CHANGE F901
DAMAGE
YES
CHECK CN900 12V REPAIR BETWEEN
NO
CN201 PIN13(PVCC) RB906 TO CN 900 AND
+5V RIGHT CN201 CIRCUIT
YES
CHECK REPAIR
CONTROL PCB IC206
STANDBY CIRCUIT
CHECK REPAIR
SWITCH POWER
SUPPLY CIRCUIT(see B)
SHECK IC100 pin2 REPAIR MAIN PCB
NO
pin3(osc frequency 27MHz) BETWEEN IC100 TO
pin51(121MHz) IC107/IC108 CIRCUIT
E F G
AUX/TV IN TUNER
NO SOUND NO SOUND NO SOUND
CHECK +5V POWER
SUPPLY CIRCUIT
NO
CHECK TEST CN201
pin6=-24v pin7,8=AC2V
pin5=5V
YES
SCHECK VFD CONTROL PCB SECTION BAD CAUSE
DAMAGE
2-2
H I
EAR HEAD PHONE AUDIO LINE
NO SOUND NO OUTPUPT
B
VFD DISPLAY
NO SHOW
AND KEY FUNCTION
RE-INSERT AND FIX
YES
rb201 and rb202CABLE THE CABLE
LOOSE OR BAD INT
NO
CHECK CONTROL PCB
NO
RB201 pin5=+5V PCB POWER SUPPLY
CIRCUIT
CHECK TEST CN201 CHECK IC100
YES NO
pin2/CE pin3/CLK IC400
pin4/DATA
YES
J
DIGITAL LINE
NO SOUND