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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
Euro DS1
blue screen only
supply to IC250 pin 7 missing - C257 33µ 16v s/c & D250 2v1 zener o/c
14-09-04
Sharp
Euro DS1
off with faint whistling
lopt
14-09-04
Sharp
EURO-DS
field collapse
IC1402 NVM3060 can be corrupted - check location 7A should be 00
14-09-04
Sharp
EURO-DS
off - no st/by
C707 22µ 50v
14-09-04
Sharp
S3B
flickering pic
BY299 D713 high fwd res
14-09-04
Sharp
S3B
low contrast with flashes
BF421 tr on crt base (auto grey scale)
14-09-04
Sharp
S3B
no pic - rushing noise from spkr
9.5v supply missing - R745 0R33 o/c
14-09-04
Sharp
S3B
Q603 lop tr 2SD1554 s/c
evidence of overheating - check drive wfm - if low change D601, 603 & 607 1N4004
14-09-04
Sharp
S3B DV5131H
coloured lines on top
C712 100uF 35V
14-09-04
Sharp
SV2142ED
Hi HT at 250v (115v)
Crack in print by pins 1 & 4 of STRD5441
14-09-04
Sharp
SV2588H
Dead aft brief activity at sw on
Overiding relay gave blank raster/no sound - D712 & D713 dry joints
14-09-04
Sharp
SV2589
For PSU problems.
Resolder diodes attached to PSU heatsink.
14-09-04
Sharp
SV2589
INT RED TINT IN TOP 2/3rds OF PICTURE
C636 DRY CHECK DIODES ON HEATSINK ALSO
14-09-04
Sharp
SV2589
Red tint at top of pic & slight vert jitter
C636 330µ dy joints
14-09-04
Sharp
SV287XH
Blank raster/no sound - OSD present (RF & Scart)
Switching [video and audio] is performed by IC401 [M51321P] a three gang three way device. pin 15 of the IC works on a tristate level. With the IC supply being 12V: 0 - 2.5V Input from BNC; 5 - 7V Input from scart ;9 - 12V Input from tuner. Diode D419 [DX00458M] which links to the wiper of the AGC preset was leaky, limiting the voltage on pin 15 to 7V and thus preventing tuner mode selection. Replace D419 with an IN4148
14-09-04
Sharp
SV287XH
St/by only at sw on with burning smell
R518 2R2 smokes due to fop chip IC501 LA7831 faulty - caused by C521 & 522 100µ 35v o/c
14-09-04
Sharp
VT-2198B
unable to reduce vol to min - OSD OK
R1090 12k 0.25w on daughter pcb
14-09-04
Sharp
VT3700
No sound/pic - tape stuck in
R761 1R fusible o/c, Zener D757 15v s/c, L752 o/c & check ck caps in psu
14-09-04
Sharp
VT3700H
Off tune on timer recs
VT supply to tuner rises when tV in st/by - IC005 33v stab RH-IZ0249CEZZJ
14-09-04
Sharp
VT3700H
St/by only
L752 burnt up - replace all smis in the line concerned
14-09-04
Sharp
VT3700H
Won't tune.
IC1005 , R760 IC1005 Sharp RH-IX0249CEZZ R760 220ohm , Sharp VRG-RF2EB221J
14-09-04
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