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CHECK SMALL SIGNAL BOARD
Start
Power ON
Check if the LED
shows an Error Code.
Analyse with the
Error Code table.
No
Supply Voltages
+8V,+8V_1,+8V_2
+5V_1 ok ?
Yes
Check :
8V_FE: 11 and 45 / IC001
- Tuner Power Pupply :
+30V : 9 / Tuner
+40V : 5/BR003
+5V : 6 / Tuner
Correct
No
V5D & 3VD3
ok ?
Yes
Check IR signal
6 / BR001 and
25 / IR001
- Check Clock SCL (2 / BX001)
and Data SDA (1 / BX001)
- Check Oscillator:
pins 11/12 IR001
Correct
- Check H_drive (2/BP005)
- Check V_drive (6/BV001)
- Check safety threshold
pin 5 / IV200 (Video Part)
No
pin 5 IV200
threshold >2V
Yes
Check:
- Horizontal Deflection
( POWER / SCAN BOARD)
- EHT too high.
- Yoke coil : Short-circuit, broken
or open.
- Cathode Ray-Tube
- Cathode Ray Current
Error
Code Table
Check Power Supply
No Correct
and Module
Protector ZR001..004
Check 3.3V
regulator and
IU390, LU303
( Upconverter part)
No Correct
Replace Small
Signal Board
Replace Small
Signal Board
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