LC-20S1E (serv.man31). Buzzing from internal speakers — Sharp TV Technical Bulletin (repair manual)

Model
LC-20S1E (serv.man31)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
77.12 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / LCD / Buzzing from internal speakers
File
lc-20s1e-sm31.pdf
Date

View Sharp LC-20S1E (serv.man31) Technical Bulletin online

LCD 2005 02 01
Date of Issue:      10
th
 February 2005
        
Classification:
Yellow
LCD TELEVISION TECHNICAL BULLETIN
Page 1 of 2
Sharp Electronics (UK) Limited
Reference - LV-110
Revision  - 1
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
 Red – Carry out on all units
MODELS
LC13S1E
LC15S1E
LC20S1E
SYMPTOM A buzzing noise can be heard coming from the internal speakers when the brightness
level is set to medium or dark.
CAUSE
Noise from the inverter circuit enters the audio stage via the ground line.
ACTION
Whenever  a  unit  comes  in  for  service,  that  is  between  the  serial  numbers  indicated
below, fit the jumper wire as shown.
LC13S1E
835936 to 838287
LC15S1E
865940 to 869096
LC20S1E
908084 to 915775
1.  Cut the ground PWB track as shown on page 2.
2.  Add the jumper wire between L3301 and pin 10 of IC3301.
Note
  When  soldering  the  jumper  lead  to  L3301  and  IC3301,  ensure  that  the  maximum
height of the connection is no greater than 3mm.
  Ensure that the maximum height of the wire no greater than 5mm.
REF NO
DESCRIPTION
PART NUMBER
PRICE CODE
-
Jumper wire 140mm
QCNW-D512WJQZ
AD
LCD 2005 02 01
Date of Issue:      10
th
 February 2005
        
Classification:
Yellow
LCD TELEVISION TECHNICAL BULLETIN
Page 2 of 2
Sharp Electronics (UK) Limited
Reference - LV-110
Revision  - 1
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
 Red – Carry out on all units
Page of 2

Download Sharp LC-20S1E (serv.man31) Technical Bulletin

Here you can view online or download Sharp LC-20S1E (serv.man31) Technical Bulletin in pdf. This Technical Bulletin can help you recover, restore, fix, disassemble and repair Sharp LC-20S1E (serv.man31) LCD. Information contained in Sharp LC-20S1E (serv.man31) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).