21HS-50C
TROUBLESHOOTING TABLES.
NO RASTER
Check F701
NO YES
Does F701
appear blown
out?
Replace the fuse
Check T701 pin
16 voltage.
NO Does F701 YES
appear blown
out again?
NO Does 290V YES
appear at pin (16)
of T701 (SMT
Transf.)
END Check IC701, D701, D702,
D703, D704, C705, Q701
Check NO YES
R701,S701 and Does 110V
AC in. appear in
Main+B C752) ?
Check F751, D758, C702
IC702, Q752 and R615 line
NO Check D1001 YES
Does Power LED
bright red Turn on?
NO YES
Check CRT
connector K1-K5
BIAS
See Many often D1001 Check C878 Check IC801
Flashes in red, this indicates which Heater
IC to check up.
Explanation:
NVM
(IC1002)2 Times Flash
TV Processor
3 Times Flash
(IC801)
Sound Processor
(IC3001)5 Times Flash
TUNER
6 Times Flash
(TU201)
Protector CircuitPower LED dark red
(R1028,D615,D612,D509,D510,D614,D604,D605,Q603)
Note: 4 Times Flash change to NVM-DATA (S-L)
34 |