SHARP 76DW18H
Manual de Servicio

CTV990107
Month of Issue: Classification:

CTV991202 TELEVISION TECHNICAL BULLETIN
Month of Issue: December 1999 Classification: White Page 1 of 1

TELEVISION TECHNICAL BULLETIN
PHILIPS CRT Original deflection yoke PWB shown on left

January 1999 White Page 3 of 3

MODELS

66DW18H

76DW18H

76EF19H

76EF20H

CONNE
Orange Yellow Green

Connector 1

SYMPTOM The following problems can occur on the 100Hz PWB.
Red Yellow Red Orange Green

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Intermittent digital noise on the picture Intermittent mosaic squares on the picture Mosaic effect if the 100Hz PWB is tapped Red, green or blue screen if the 100Hz PWB is tapped

KC lead

CAUSE

Problems around the field mixer IC, SDA9270. � � IC6108 in the 66DW18H and 76DW18H IC6105 in the 76EF19H and 76EF20H

ACTION

Carry out the following counter measures. 1. Make sure that there are no dry joints on the Mother PWB 2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove IC6108/IC6105 Note that you can operate the 100Hz PWB with the shield cans removed. It is important that these are returned to there original condition when the job is completed.

To change the deflection yoke wiring from a Thomson CRT to a Philips CRT, proceed as follows 1. 2. 3. Unsolder both the green and yellow (FV) and red and orange (FH) leads from the deflection yoke PWB. Solder these leads to the Philips CRT as shown above. Replace wire KC (QCNW-2775BMZZ) that connects from the CRT socket PWB to the neck of the CRT with lead QCNW-2757BMZZ.

Sharp Electronics (UK) Limited
Sharp Electronics (UK) Limited Originator AvW Supervisor Approval Date / / Reference SP84001X Revision 2 White � Carry out as required, Yellow � Carry out as required and whenever the unit comes in for service, Red � Carry out on all units

Reference JR031299-1 Revision 2 White � Carry out as required, Yellow � Carry out as required and whenever the unit comes in for service, Red � Carry out on all units