Service manual

PV152 2-20 PROJO
TROUBLESHOOTING
Inspect Red LED (DP37) on Deflection, Blinking?
Check EP98,DP11,Q777,QH01,TH01,DH11, on
deflection module.
Turn off power wait (3) seconds, turn ON ,carefully
inspect Green LED.
Does the Green LED tun off at the same time?
Is voltage at pin(4) of IP01 14v-18v?
Yes
Check PQD1 for 120vac
CheckVR923 on SMPS
Has protector EP01 blown?
Check IP01,DP04&5
RP10,RP11,RP12
Replace EP91
Check DP04&5, Rp02&3,CP05
RP10,RP11,RP12
Does raster appear with G and K of
QP01 shorted?
Check Q777,QH01,T751,T752
Are voltages of both ends of T751(primary side)
normal?
Is the base of Q751 normal?
No
Check T751,R754,R755
Check I701 pin(15) H-out,pin(8) Hvcc,
QP04,DP35,DP36
Check QP01/ Replace QP01
Yes
No
Yes
No
Yes
Yes
No
Check IP01,
RP10,RP11,RP12
No
Yes
No
No Yes
Yes
No
Poor Video Sync
Is voltage on I601 pin (10) +28VDC?
Is waveform on I601 pin (3) as shown?
Refer to diag (1) below.
Is waveform on PSD3 pin (8) as shown?
Refer to diag (2) below.
Replace Deflection PWB
Replace Small Signal PWB
No Color
Poor White Ballance
4.00Vpp
Is waveform on I201 pins (7,9) normal?
Are Voltages on connector PZC pins (1,3,5,) normal?
Replace CRT PCB assy.
Replace Small Signal PWB.
Is input signal RF or Composite?
Diag 1
3.20Vpp
Diag 2
No
No
No
Yes
Yes
Yes
Replace Small Signal PWB.
Replace 3 Line PWB.
No
Yes
Yes
Yes
No
No