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CTV990113
Month of Issue: January 1998
Classification: White
TELEVISION TECHNICAL BULLETIN Page 1 of 2
MODELS 51CS03H 51CS05H 59CS03H 59CS05H
59CSD8H 66CS03H 66CS05H 66CSD8H
Symptom Possible Remedy
Dead no sound or vision)
Q701 & Q601 failed * D609, D610, D720, D718, Q702, Q703, C601, C604,
C619, C714, C708, R706, R707, R720 and inspect scan
coils and scan coil socket for bad connections.
Q601 failed D609, D610, C601, C604, C619 and inspect scan
coils/scan coil socket for bad connections.
Q601 s/c and failure of audio o/p stage Q601 failed due to missing - 16V rail (supply to o/p
stage). Leave Q601 out of circuit until you have
confirmed that both the +16V and the -16V rails are
correct.
No voltage at Q701 drain Technical Bulletin CTV970201 (Issued Feb 97)
NICAM LED on or flashing (aerial disconnected) See flowchart on page 2
HT rail present, no line drive, NICAM LED switches on for Check R611 and IC201
3-6 seconds then goes off (ariel disconnected)
Keeps switching to standby Check audio output stage for a short circuit
HT rail missing-unsolder pin 2 of 0V Power supply not running (check CTV is not in
LOPTX and measure the HT rail standby mode
20V-40V Short on one of the secondary LT supply rails e.g.
audio o/p stage
110V-150V Short circuit on line o/p stage
Line drive pulsating IC401 not communicating with micro
Line drive pulsating and R628 (R634 in later Q704 (low standby/sound 5V rail)
models) burning
Slow start up i.e. more than 3-6 seconds for C714 (please ensure that this is replaced with the
line oscillator to start depending on model specified part)
Audio Problems
Intermittent sound Technical Bulletin CTV970203 or CTV980204
Whistle on the Audio (later models only) Damage print feeding 40V to R368
Distorted sound IC301 (MSP3410)
Vertical O/P Stage Faults
No or intermittent vertical output Technical Bulletin CTV970207 (Issued Feb 97)
Failure of vertical output stage Technical Bulletin CTV970202 (Issued Feb 97) &
check Q507/8/9
Intermittent frame cramping Replace D501, D502, D507, D512, C506 & C507
Rainbow effect (no line pulses at IC501 pin 2) C501
Rainbow effect and R628 (R634 in later models) open R631 or R632 fusible resistors
circuit
Sharp Electronics (UK) Limited
Originator AvW Supervisor Approval Date / / Reference AVW120199/2
Revision 1
White