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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair
Make
Model
Problem
Solution
Date
Found: 711
Sharp
C1420H
No start up
STR40090
14-09-04
Sharp
C1420H
No tuning - sound or channel change.
Channel change button.
14-09-04
Sharp
C1421
Dead with no st/by relay energising
No volts reset pin 11 of micro IC1002; D607 zener s/c
14-09-04
Sharp
C1421
Fback lines
HT to RGB only 72v (180v) - C620 4µ7 250v & R620 22R
14-09-04
Sharp
C1421
Sound low
L301 in if unit
14-09-04
Sharp
C1421
St/by only - comes on briefly at sw on
OK on 110v ac mains - STR40090 faulty
14-09-04
Sharp
C1421 7PS
LINE JITTER
R308 820k
14-09-04
Sharp
C1421 7PS
LOW SOUND , ACTION OF VOL CONTROL ALTERS , ABOVE HA
CHECK L301 - IF UNIT
14-09-04
Sharp
C1421 7PS
Set dead StBy relay not enigised
Check pin 11 IC1002 for reset V & D607
14-09-04
Sharp
C1421 7PS
Stuck in standby.
RY701 RELAY WINDING OC
14-09-04
Sharp
C1421 7PS
Stuck in StBy EHT comes up then goes into StBy
STR40090 u/s
14-09-04
Sharp
C1421H
St/by only
RY701 relay o/c winding
14-09-04
Sharp
C1430H
pic stable with no sound, when sound is up then pic shakes in sympathy with sound
replace R680 10k. It is connected to Q610 line startuo regulator, and if o/c causes PSU overcurrent to become operative and lower supply voltage under current demand presented by sound output stage.
14-09-04
Sharp
C1430H
Shuts down aft 4 mins
Increasing brightness instigates fault - beam curr lim prot fault - R623 1M2 o/c
14-09-04
Sharp
C1430H
SOUND MODULATES PIC , OK. WITH NO SOUND
R680 HIGH OR OC. 10K
14-09-04
Sharp
C1431
Dead with psu working
No 12v pin 8 X0712 - R679 100k o/c
14-09-04
Sharp
C1431
Reverts to st/by aft 10 secs of sw on
To dis trip - disconnect Q603 - if ok then the fault is in trip cct; R623 1M2 o/c & check other hi val res
14-09-04
Sharp
C1431
Set dead PSU working line osc does not start
Check for 12V at pin 8 X0712 if missing R679 ( 100K ) o/c
14-09-04
Sharp
C1431H
Dead - psu works with 115v HT to LOP
No line dr - R679 100k in supply to IC801 o/c
14-09-04
Sharp
C1451E
Flashing pic after warmed up
C619 10µ 100v
14-09-04
Sharp
C1451SC
Excessive horizontal width.
Check replace C613 cap.
14-09-04
Sharp
C1451SC
Excessive horizontal width.
Check replace C613 cap.
14-09-04
Sharp
C1451SC
Foldedover picture,reduced height and visible white line in te centre of screen.
Change C508 2,2uF/35V tantalum cap. Seemed to be O.K with a VOM.
14-09-04
Sharp
C1451SC
Foldedover picture,reduced height and visible white line in te centre of screen.
Change C508 2,2uF/35V tantalum cap. Seemed to be O.K with a VOM.
14-09-04
Sharp
C1495
FIELD COLLAPSE
R511 15k R512 1k2
14-09-04
Sharp
C1495
Field collapse
R511 15k & R512 1k2 o/c
14-09-04
Sharp
C14ET1EK
Bright blank raster with no sound
Check spker plug in CN201 NOT CN602
14-09-04
Sharp
C1871
Field partial collapse
R525
14-09-04
Sharp
C1871
Frame collapse.
R525.
14-09-04
Sharp
C1891
Brightness variation.
Resistors in series with first anode control arcing.
14-09-04
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