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Repair tips

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

MakeModelProblemSolutionDate
Found: 79
JVC25SX1EKComes on in AV mode - no sound when chan selectedIC703 EEPROM Pt no AT24C04255X1EK & re-initialise as per manual14-09-04
JVC29SX2EKFocus out, field scan low & reverts to st/byIC401 field chip, LA7845N and FR553 1ohm 1w safety resistor in -13V supply14-09-04

JVC29SX2EKTo acces service modePress the Information button (shown as "i") and the Mute buttons simultaneously14-09-04
JVC29SX4EKReverts to st/by aft 5 secs of small picC521 5th harmonic tuning capacitor. 14-09-04
JVCAV21SX1No soundOnly 3.5v supply to Dolby pcb - should be 5v - IC952 LM7805 reg14-09-04
JVCAV21SX1EKField - partial collapse - intDry joint C961 2200µ 25v ; 8v smoother14-09-04
JVCAV21SXLEKHigh pitched buzz - sound/pic OKL521 line lin coil vibrating - could also be LOPTx14-09-04
JVCAV25SX1EKField - top crampTDA8350Q chip faulty14-09-04
JVCAV25SX1EKInt Field collapse with it turning offDry joints around FOP14-09-04
JVCAV25SX1EKNo soundIC952 5v supply to Dolby pcb low, check for o/c L601 N10 ccct prot. Dis A mute pin 8 IC601 to restore sound. Fault could be due to micro or eeprom caused by crt flashover14-09-04
JVCAV25SX1EKNo soundIC1952 KIA7805PI 5v reg14-09-04
JVCAV25SX1EKshuts down almost straight after sw onHT correct but EHT high due to C1521 3,800pf 1.5kv reduced cap14-09-04
JVCAV25SX1EK JAFlickering & flashing picFOP chip14-09-04
JVCAV25SX1EK JAFlickering/flashing picFOP chip replacement seems to have cured it14-09-04
JVCAV25SX1EK JAInt pic blanking outTDA8350Q vertical output chip (IC401). If R971 if fitted & overheating, remove it (should not be fitted in UK models)14-09-04
JVCAV25SX2EKNO SOUNDREPLACE S/C C613 100MFD25V14-09-04
JVCAV25SX2EKNo sound - pic okR617 overheats due to C613 100µ 25v s/c (no 5v suppl)14-09-04
JVCAV25SX2EKPic comes on for 5 secs at sw on then offX ray prot active due to D582 BZV85C6V8 s/c causing Q573 base to rise14-09-04
JVCAV25SX2EKPICTURE FLUCTUATES ON AND OFFCHECK D582 FOR S/C (6.8V ZENER)14-09-04
JVCAV25SX2EKSmall picC521 3000pF 1.6kv "S" corr cap changed value14-09-04
JVCAV25SX2EKSMALL PICTURE WITH NO DISTORTIONREPLACE C521 3000PFD16KV14-09-04
JVCAV25SXEK JHSmall pic then reverts to st/byLine tuning cap C521 (4n 1.5kV for 29" sets (part QFZ0152-4001) or 3n6 1.8kV for 25" (part QFZ0122-362)).14-09-04

JVCAV29SX1Field collapseIf version 3 fit mod as described TV Mag Oct 00, if vers 5 not nec14-09-04
JVCAV29SX1 JABuzz at 6khz on soundIC601 MSP3410-SDIL multi sound proc chip on AV selector board14-09-04
JVCAV29SX1EKBright white raster - sound okFR551 white fusible o/c - back middle of pcb14-09-04
JVCAV29SX1EKBrightness fluctuates int blanking out when warmOK when 16:9 button pressed - FOP chip TDA8350Q14-09-04
JVCAV29SX1EKBrightness variesDry joint earth pin of LOPTx14-09-04
JVCAV29SX1EKBRIGHTNESS VARYINGRESOLDER EARTH PIN ON LOPTX14-09-04
JVCAV29SX1EKDead - HT present but No line driveTDA8366 jungle chip producing no line drive - faulty14-09-04
JVCAV29SX1EKDead - Red LED comes on at sw on turning GreenCheck earth lead to CRT aquadag is fitted securely aft FOP mod kit fitted or IC806 can cause corrupt I2C bus14-09-04
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