Sharp 9Q-FG1A - Chapter 4. Trouble Shooting Flowchart

29Q-FG1A/1F/1N/1S/1U
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CHAPTER 4. TROUBLE SHOOTING FLOWCHART
[1] TROUBLE SHOOTING FLOWCHART
NO RASTER
LED COLOUR ?
Power on by R/C
Does horizontal circuit
momentary oscillate &
LED is blinking ?
Check 3.3V supply at
pin2,4,5&75of
IC1100. Check
oscillation of crystal
X1001.
Check CRT connector
(KY), (H) bias.
(Heater voltage 120 V,
210 V line)
Abnormal
Check R,G,B
input and output
of IC 851.
Check the heater
voltage 120V and
210V line from the
main PWB side.
RED
GREEN
RED
Yes
No
Normal
Check protector
circuit and pin 47 &
48 (waveform no.3 &
4) of IC1100. Also
check the waveform
no.5 of IC501 and its
related parts. Check
8V supply at pin 36
of IC1100, 5V supply
at pin 55, 35, 18 &
11 of IC1100.