LC-20E1E (serv.man27). Improvement to counteract whistle from AC adapter - Sharp TV Technical Bulletin (repair manual)

lc-20e1e (serv.man27) technical bulletin
Model
LC-20E1E (serv.man27)
Pages
2 Few pages! See other manuals at the bottom of the first or last page.
Size
48.72 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / LCD / Improvement to counteract whistle from AC adapter
File
lc-20e1e-sm27.pdf
Date

Read Sharp LC-20E1E (serv.man27) Technical Bulletin online

LV079
Sharp Electronics (UK) Ltd., Technical Services Group
General 
Please note this information for your service.
Model
Model
S/No. range
Model
S/No. Range
AC adapter
LC-20B4E
~ 302311140
LC-20B4E
~ 302311112
UADP-0241CEPZ
LC-20B2EA
~ 210314439
LC-20B2EA
~ 206311362
LC-20B2EA
~ 303312171
LC-20E1E
~ 210312516
LC-20E1E
~ 208311682
LC-20C2EA
~ 206311820
LC-20E1E
~ 303312081
LC-20C2EA
~ 202311112
LC-22SV2E
~ 302313048
LC-22SV2E
~ 302315376
Problem 
Whistle noise is audible from AC adapter when the unit is turned off.
Cause 
Resonance between the PWB and the ceramic chip capacitor in AC adapter
Countermeasure 
The improved AC adapter is used in the production units after the serial number above.
The improved AC adapter has the following rev code and date code on the label of AC
adapter.
(No parts code change)
AC adapter
Rev code
Date code
UADP-0243CEPZ
K or after
K3C27D or after
UADP-0241CEPZ
M or after
M3C27D or after
Servicing 
If a customer complains of this problem, please replace the AC adapter with the improved
one.
WHISTLE NOISE IS AUDIBLE FROM AC
ADAPTER WHEN THE UNIT IS TURNED OFF
TECHNICAL BULLETIN
Date: 05 June 2003
Model: LC20-B2EA/E1E/C2EA
Ref.:
002
Colour: White
Page:
1 of 2
LV079
Sharp Electronics (UK) Ltd., Technical Services Group
Label of the improved AC adapter
Page of 2

Download Sharp LC-20E1E (serv.man27) Technical Bulletin

Here you can read online and download Sharp LC-20E1E (serv.man27) Technical Bulletin in PDF. LC-20E1E (serv.man27) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LC-20E1E (serv.man27) LCD. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.