DV-5132H (serv.man7). Advice regarding failure of the power supply — Sharp TV Technical Bulletin (repair manual)

Model
DV-5132H (serv.man7)
Pages
1 Few pages! See other manuals at the bottom of the first or last page.
Size
23.61 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / CTR / Advice regarding failure of the power supply
File
dv-5132h-sm7.pdf
Date

View Sharp DV-5132H (serv.man7) Technical Bulletin online

 
Sharp Electronics (UK) Limited 
Reference AVW031299-1
   
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   
CTV991206 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
DV5105H 
DV5107H 
DV5132H 
 
 
 
 
 
 
 
 
SYMPTOM 
Intermittent failure of the power supply.           
 
 
CAUSE Various components.       
 
ACTION 
If Q702 immediately goes short circuit when the set is turned on, check that D716 has 
not gone short circuit or that T700 (chopper transformer) is not short circuit across 
pins 7 and 2.  Note that D716 is connected across Q702 emitter earth return resistor, 
as this is only 0.22
, D716 needs to be removed before testing.  
 
If the power supply works, but fails after being run on soak test, replace D708 and 
D709, also check that the main smoothing block (C705) has not got loose rivets.  
 
In some cases it is possible for the HT to rise significantly during standby, the normal 
value of the HT in standby is anywhere between 120VDC and 130VDC ( this rise is 
due to the line output load being removed).  If this increases above 130VDC, there is a 
problem.  Check the feedback circuit around the opto coupler and D751.  
 
Note that it is important that Q702 is replaced with the correct type or long term 
reliability problems will ensue (MJF18006).   
 
The HT voltage should be set to 113VDC on a blue screen (pull out the aerial and wait 
a few minutes - the screen will turn blue due to lack of line sync). 
     
 
REF NO 
DESCRIPTION 
PART NUMBER 
PRICE CODE 
C705 
Capacitor, 100uF 400V 
RC-EZ0104BMZZ 
AP 
D708 
Diode, 1N4934 
RH-DX0519BMZZ 
AB 
D709 
Diode, 1N4934 
RH-DX0519BMZZ 
AB 
D716 
Diode, 1N4148 
RH-DX0045BMZZ 
AA 
D751 
Diode 
RH-DX0226CEZZ 
AC 
Q702 
Transistor, MJF18006 
RH-TX0119BMZZ 
AL 
T700 
Chopper transformer 
RTRNZ0514BMZZ 
AU 
 
 
 
Display

Download Sharp DV-5132H (serv.man7) Technical Bulletin

Here you can view online or download Sharp DV-5132H (serv.man7) Technical Bulletin in pdf. This Technical Bulletin can help you recover, restore, fix, disassemble and repair Sharp DV-5132H (serv.man7) CTR. Information contained in Sharp DV-5132H (serv.man7) 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).