Nokia 920C - Page 19

5 Troubleshooting
720C/920C 5-5
5-1-7 Abnormal H_Size
T402 Pin 8 waveform is right?
Check and replace T402.
Check some parts around D415, IC261
Pin 28, IC402 Pin 2 and IC201 Pin20.
Yes
No
5-1-8 Side Pin or Trap Failure
IC261 Pin 24 output exists?
Yes
Check and replace IC261.
Check and replace IC402.
Check some parts IC402 Pin 2
and IC261 Pin 24.
5-1-9 Para. or Pin Balance Failure
IC261 Pin 24 output varies with
different DAC values?
No
Replace IC261.
No
WAVEFORMS
9
9
29.8 V (T402, #8)
CH1 P-P = 29.8 V CH1 RMS = 7.14 V