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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: 16
JVC
AV25GS1EK &
AV25S1EK
etc
Dead - HT starts to rise then decays
D521 BY228 in EW cct
14-09-04
JVC
AV25S1EK
At sw on LED red then green, red then out - dead
C468 (4u7F 50v) blown its top and R526 (39R 0.5w)burnt also D521 (BY228) s/c
14-09-04
JVC
AV25S1EK
Dead or int dead - front LED operates ok & HT/LT readings ok
Check R903 & 904 2k2 & dry joints on st/by trs Q902 & 901 near them
14-09-04
JVC
AV25S1EK
DIM PIC
C1206 LEAKY 3.3mfd
14-09-04
JVC
AV25S1EK
Dim pic with green tint
No volts at IC201 contrast control pin as C1206 3µ3 leaky
14-09-04
JVC
AV25S1EK
Field collapse
TDA3654 FOP chip
14-09-04
JVC
AV25S1EK
FRAME COLLAPSE
REPLACE FRAME IC TDA3654
14-09-04
JVC
AV25S1EK
LED COMES ON AND THEN GOES RED THEN OFF
CHECK FOR S/C E/W STAGE R526, C458 AND D521 39 OHM, 4.7MFD50V AND BY228
14-09-04
JVC
AV25S1EK
Led goes red, then green then off at sw on - no start
R526 39R, C458 4µ7 50v & D521 BY228 in E/W cct
14-09-04
JVC
AV25S1EK
NO LINE DRIVE
R903 2.2k BASE BIAS TO Q902 SLIGHTLY HIGH
14-09-04
JVC
AV25S1EK
Shuts down at sw on
D521 BY228 s/c, C468 47µ, R526 0R22?
14-09-04
JVC
AV25S1EK
Shuts down immediately after sw on
D521 BY228 s/c, C468 47µ , R526 0R2
14-09-04
JVC
AV25S1EK
Mk2
Always comes on in st/by - sometimes at full vol
EEPROM IC104 corrupt - pt no CAT93C66P
14-09-04
JVC
AV25S1EK
MXII
Unstable pic with line jitter
Video o/p from IF module has ragged sync pulses - 1µ elect cap in AGC feed
14-09-04
JVC
AV28S1EK
AV25S1EK
MX2
St/by light changes col but no line drive
No supply to line dr tfmr as R903 2k2 hi res (switches st/by tr Q902)
14-09-04
JVC
AV28S1EK
AV25S1EK
MX2
Width & E-W faulty
Replaced memory chip for electronic screwdriver - 24C01A/P IC1707
14-09-04
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Last SM download : DENON Service Bulletin OST-805
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