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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: 711
Sharp51CSDeadR643 22R 1/2w fusible had risen in value to 50R14-09-04
Sharp51CS-05H CSDead with short between C & E of LOPTrC602 1nF 2000v was causing it - leaky14-09-04

Sharp51CS03Slow start up then st/by onlyC712 220µ 25v14-09-04
Sharp51CS03HNo / int field collapseResolder L501 ( joints on body )14-09-04
Sharp51CS03H 59CS03HField fault , or general modification .Add 1N4148 from emitter Q509 to cathode D513 ( cathode to E Q509 . Pt No RH-DX0045BMZZ ) . Change R534 for 390R ( Pt No VRS-T14-09-04
Sharp51CS03H 59CS03HInt bleep from speakers or int no sound ( when hotAdd wire link from pin 22 IC301and pins 28 , 29 ( Gnd )14-09-04
Sharp51CS03H 59CS03HInt flyback lines ( may be red , greeen or blue )Flux becoming conductive on Q870 , 871 , 872 . remove transistors , clean pcb and transistors and replace .14-09-04
Sharp51CS03H 59CS03HStuck in StBy .If no 300v across C708 check for continuity from D704 cathode to L703 . PCB sometimes damaged in transit .14-09-04
Sharp51DS-02S CA10DeadQ602 (BUH515) & both audio amps IC2300 & 2301 (TDA7480) s/c, also C720 100uF/200V) blown top.14-09-04
Sharp51DS-02S CA10HT high at 200v (112v)Opto IC705 (MOC8106).14-09-04
Sharp51DS02GREEN PATCHES AND STRANGE COLOURS ON BRIGHT SCENEENTER SERVICE MODE (HOLD VOL- AND CH+ AND SWITCH ON) SELECT PAGE 00 AND SET POS 04 TO 24 POS 05 TO 2C AND POS 06 TO 4B14-09-04
SHARP51DS02HNO SOUNDREPLACE IC104 SHARRRHIX1588BMZZ14-09-04
Sharp51DS02HSt/by only & no control of front controlsR705 68k micro feed o/c14-09-04
Sharp51DS02H CA10Sound absentcorrupted EEPROM (8-pin SMD IC104 24C16) due to DJ on LOPTx earthing pin (focus, screen pots).14-09-04
Sharp51DS02H CA10When replacing EEPROMswitch set on, after 10 sec delay whilst micro writes data, tune all the channels & select weakest then sw off tv. To enter service mode hold Ch+ & Vol- on front panel while switching mains on. Set comes on in service mode on weakest chan, using ch+/- on R/C choose "AGC take over" in menu & press STANDBY, set will adjust AGC automatically. Now correct geometry if reqd.& press STANDBY to memorize. To exit service mode simply switch off.14-09-04
Sharp51DS03HSt/by onlyR705 68k hi res14-09-04
Sharp51DS03HStuck on 1 chan (ITV)R704 68k hi res14-09-04
Sharp51DS05H CA10Int reverts to st/byFault can be induced by flexing main pcb - dry joints micro IC101 sm on print side underneath14-09-04
SHARP51DT-25HFRAME COLLAPSE WITH NO SOUNDCHECK Q500 BC32814-09-04
Sharp51DT-25HLack of height, no vid & tuning drift at sw onNV memory mode - fit 2 x zeners D510/511 pt no EX0404BM22, fit coil Pt no VP-CF120K0000 in place of link J122 & fit another zener D403 pt no RH-EX0412BMZZ. (Cct ref printed on pcb)14-09-04
Sharp51DT-25HLines across screen when coldC604 220u 10v14-09-04
Sharp51DT-25H CA1Stuck in st/by with motorboating from spkrC712 220µ 16v in 10v supply almost o/c14-09-04

Sharp51DT25HDead - no st/byR705 560k o/c, also replaced R704 560k14-09-04
Sharp51DT25HGoing off tune picture blanks etcC715 470mfd 10v o/c14-09-04
Sharp51DT25Hint blank raster, lack of height, off tuneFit D511 & 512 3v6 zeners in marked places next to IC201, fit D403 by plug K - replace link 122 in 5v supply with 12µ coil.14-09-04
Sharp51DT25HInt lack of height or off tune when 1st sw on - ok at subsequent sw onSharp mod - add 3.6v zener between pin 63 IC201(cathode) & chassis; add another 3v6 zener pin 64 & chassis(cath to chip). Substitute link J122 with 12uH coil pt no VP-CF120K0000; Add 7v5 zener pin 30 (cath) & chassis. Check CRT final anode for cleanliness14-09-04
Sharp51FS51HAGC overload/off tune type faultTuner faulty14-09-04
Sharp56FW-53HDead & E/W problemsLOPTr BUH515 leaky, C613 SH1010 - CHS dry jointed & o/c - cause of problem, L603 RCILP0286BMZZ, Q506 RHTX0151BMZZ(2SD2391Q) sm E/W Tr, R613 3k3 3w, D516 47v zener14-09-04
Sharp56FW-53H DA50WE/W faultyC613 560nF 250v o/c in LOP stage14-09-04
Sharp56FW53HBlows LOPTr int at sw onC607 330µ in line driver14-09-04
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