Daewoo DQR-1000D, Service Manual

Page: 49 / 106

49
TROUBLESHOOTING
P750 Check +3V3STBY
(Pin 1,2,3 &4)
Check +5VSTBY(Pin8)
RESET IC (IC501) Check Pin1
High>>Low>>High
MICOM Crystal (X500)
Check whether
X500(24.576MHz) Oscillates
MICOM(IC500)
Check SDA(Pin84)&SCL(Pin85)
Replace IC501
Replace X500
Check Soldering
or Replace IC500
NO
YES
YES
NO
NO
YES
ION Check Pin68
Low>>High>>Low After RESET
YES
NO
Replace IC506(EEPROM)
& IC506(FLASH)
Level Shifter Check
SDA(Q502)& SCL(Q503)
YES
NO
Replace Q502 &Q503
EEPROM (IC506)
Check SDA(Pin5) & SCL(Pin6)
YES
NO
Check Soldering
or Replace IC506
SDRAM (IC504)
Check WE(Pin29), OE(Pin24),
CE1(Pin22) & CE2(Pin30)
NO
Check Soldering
or Replace IC502
FLASH (IC502) Check
WE(Pin11),CE(Pin26), OE(Pin28),
RP(Pin12) & RDY(Pin15)
YES
Check Soldering
or Replace IC504
NO
IC503 Check OE(Pin1) &
LE(Pin11)
YES
Check soldering or
Replace IC503
NO
Check Soldering of other
parts that have 5xx location
YES
YES
Case A) Analog Board
Check POWER Circuit
NO