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7 Troubleshooting
7-2-17 Micom Failure
Check the connection of signal cable.
Check H/V sync from PC or signal
generator.
Check if timing is out of spec or not.
Key check (all key) : Refer to 7-2-19.
Is 5V on IC202's Pins 9 and 35?
Yes
Are oscillation (8 MHz) on
20
IC202's Pins 34 and 35?
Yes
Check reset part.
Are Q204, C223 and R210 ok?
Yes
Check power key (IC202's Pin 2).
Normal : 5 V, Pressing key : 0 V
Yes
Are H/V sync input on
24 25
IC202's Pins 29 and 30?
7-20
If signal cable is disconnected, self raster (No Video, Bright Raster) appears.
If there is no H/V sync, monitor is operated as DPMS mode.
If out of sepc, monitor is operated as stand-by mode. (No Video, LED: 0.5 sec toggle)
14": Horizontal 30 ~ 55 kHz, Vertical 50 ~ 125 Hz
15": Horizontal 30 ~ 61 kHz, Vertical 50 ~ 125 Hz
No
Is 13 V on C627?
Check and replace IC603.
No
Check and replace X201, C205 ,C206.
No
Replace it.
No
Check and replace SW211, IC202.
When disconnecting signal
Yes
cable: Is 0V on IC202's Pin 13?
When connecting signal cable:
Is 5V on IC202's Pin 13?
No
Yes
No
Refer to 7-2-1
No Power.
WAVEFORMS
4.92 V (IC202, #33)
20
CH1 P-P = 4.92 V
CH1 RMS = 2.912 V
Cceck and replace
R201, IC202,
Signal cable.
CHA42*7L/5**7L
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