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Yes
Turn off power wait (3) seconds, turn ON carefully
inspect all Green LED's on SMPS.
Did all 5 LED's turn off at the same time?
Find which LED fails to light or dims first on SMPS.
D949-SMPS STBY +11v
Check D918,I906,I007,I009
D931-SMPS SW +5v
Yes
Check D918,I907,I011,I012
Yes
D927-SMPS STBY +7v
Check D918,I905,I008,I010
D912-SMPS SW +29v (Audio)
Check E992,D910,IC01
Does raster appear with G and K of
Q905 shorted?
Yes
Replace Q905
Check Q905,D921,D908,I902,Q902,D923
Is Voltage at pin(53) of I001 low?
Yes
Check Q003,Q004,D922,S901,Q002
Yes
Is voltage at pin(23) of I001"AC Clock" in?
Check Q008,Q009,I904,D909
Yes
Check I001 pin(54)
Does reset occur?
Yes
Check I001 pin(62)
is 4mhz present?
Yes
Check I002
Replace I001
Check I001 pin(63)
Is 1.6v present?
Replace I001
Yes
Replace X001
Replace I006
To page ____
Turn off power wait (3) seconds, turn ON ,carefully
inspect Green LED.
Does the Green LED tun off at the same time?
Check EP98,DP11,Q777,QH01,TH01,DH11, on
Yes
deflection module.
Does raster appear with G and K of
QP01 shorted?
Yes
Check QP01/ Replace QP01
Is the base of Q751 normal?
Check I701 pin(15) H-out,pin(8) Hvcc,
Yes
QP04,DP35,DP36
Are voltages of both ends of T751(primary side)
normal?
Yes
Check Q777,QH01,T751,T752
Check T751,R754,R755
No Raster
Is Power LED on Control Panel on?
No
Is Red LED Blinking on SMPS?
Is voltage at pin(4) of I901 14v-18v?
Yes
Check D904,R905,R906,C907,F901,R902
No
Yes
Check I901,D961,R918,R919,Q901
No
Is Click of Relay heard
Is the voltage at pin(51) and (33) of I0013.3v?
Yes
No
Is the voltage at PQS2 pin(1) 7volts?
Yes
No
No
No
No
No
Inspect Red LED (DP37) on Deflection, Blinking?
Yes
No
Is voltage at pin(4) of IP01 14v-18v?
Yes
No
Yes
No
No
Yes
Check DP04&5, Rp02&3,CP05
No
Troubleshooting
No
No
Has protector E991 blown?
No
Replace E991
Replace I901
Check R918,R919
No
Check Q029,D035,L004
No
D927-SMPS STBY +7v
Check D918,I905,I008,I010
Has protector EP01 blown?
No
Check IP01,
No
RP10,RP11,RP12
Check IP01,DP04&5
RP10,RP11,RP12
Replace EP91
Check PQD1 for 120vac
RP10,RP11,RP12
No
CheckVR923 on SMPS
93
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