Sharp 29K-FD5RU, Service Manual

Page: 19 / 50

19
29K-FD5RU
29K-FG5RU
19-1 19-2
TROUBLE SHOOTING FLOWCHART
NO RASTER
Check CRT connector (KY), (H) bias
(14V,120 V, 210 V line).
LED COLOUR ?
Power on by R/C.
Check protector
circuit and pin 106
& 107 (waveform
no.3 & 4) of IC
2100. Also check
the waveform no.7
of IC501 at pin 4
and its related
parts.
Check the power
circuit consisting of
IC701, IC702,
T701 and its
related parts. Also
check the
horizontal out
circuit Q604 and its
related parts.
GREEN
GREEN
Yes No
RED
RED
Does horizontal circuit
momentary oscillate?
Check the 14V,
120V and 210V
line from the
main PWB side. Check R,G,B
input and output
of IC 851.
Normal Abnormal
TROUBLE SHOOTING FLOWCHART (Continued)
Check the power
circuit at the front
unit consisting of
IC4702, IC4701,
D4707 and its
related parts.
Check the power circuit
consisting of IC701, IC702,
T701 and its related parts.
Normal
Check F3700.
Replace the Fuse.
Is the Fuse again blown out?
Does STBY+5V appear at pin 1
P1001 main unit ?
Blown out
No
No Yes
Yes
Check F4701.
NO LED LIGHT
Check 3V output
from pin 22 of IC
2100 and its
related parts.