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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: 70
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

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
Sharp51DS05H CA10Int reverts to st/byFault can be induced by flexing main pcb - dry joints micro IC101 sm on print side underneath14-09-04
Sharp66DS-03H CA10Dead - psu blown up due to faulty opto couplerReplace Q702, 703 etc & opto - careful not to overheat it when soldering new one in or hi HT persists See Sharp Tech bulletin CTV2001010114-09-04
SHARPCA10Dead Secondary voltage was missing . R 713 (560 K ) in series with R 714 (560K) was O/C14-09-04
SharpCA10green patches/strange colours (usually on bright scenes)CRT shadowmask warping on excessive beam current. Enter service mode, select page 00 and set POS 04 (brightness) to 24; POS 05 (saturation) to 2C; POS 06 (contrast) to 4B.14-09-04
SharpCA10No response to R/C or front controlsCheck R704/5 68k but in this case the main micro IC101 C161K had a short on pin 74 data I/P - lifting this pin gave correct amplitude of data across R102. Chip is 80 pin sm device!14-09-04
SharpCA10no soundaudio Ics muted due to pin 12 being held low, SMD C2310 or C2320 33nF leaky14-09-04
SharpCA10not memorising customer preferences (col, bright, cont) every time the set switched onthere is no customer preference memory on these sets, alter for optimum in service mode14-09-04
SharpCA10service modeto enter service mode switch on while holding VOL- and CH+ together14-09-04
SharpCA10 51DS02Hno soundIC104 NVM24C16 (RHIX1588BMZZ)14-09-04
SharpCA10 59/66DS03Hbottom half of pic Ok, top half stretched with bright line in the centre15V supply missing, replace fuse F601 1A near LOPTx14-09-04
SharpCA10 59/66DS03Hbottom half of screen dark on high contract scenesreplace D514 1N4148 (leaky), feeds off frame stage to pin 22 jungle IC20114-09-04
SharpCA10 59/66DS03HdeadC613 680nF 250V burn-up or buckled, also R613 2.2k R610 safety 33R (RRXZ0218BMZZ)14-09-04
SharpCA10 59/66DS03Hdead, line drive present on base of LOPTr but it is not being turned onlack of bias to Q602 due to D605 o/c (RHDX0591BMZZ)14-09-04
SharpCA10 59/66DS03Hdead, neon light onR704 68k 1W (no 5V to Micro)14-09-04
SharpCA10 59/66DS03Hdistortion on right channelSMD C2314 100nF leaky14-09-04
SharpCA10 59/66DS03Hexcessive width with E/W errorreplace R519 100k (o/c)14-09-04
SharpCA10 59/66DS03Hframe collapsefuse F602 o/c (QFSJ2521CEZZ)14-09-04
SharpCA10 59/66DS03Hno remote or front control functionsR704, R705 68k 1W in 5V supply to Micro are high or o/c14-09-04

SharpCA10 59/66DS03Hno remote or local buttons functionR705 68k o/c (no supply to IC702)14-09-04
SharpCA10 59/66DS03Hno sound on speakers, Ok on headphonesSMD C2310 33nF leaky (45V line down to about 30V)14-09-04
SharpCA10 59/66DS03Hpartial frame collapse and foldoverreplace fuses F0601, F0602 rear of PCB, upgrade to 2.5A. If fuses Ok, check R617 22R14-09-04
SharpCA10 59/66DS03Hset won't start (no line drive)D602 s/c in -13V supply (RHDX0504BMZZ)14-09-04
SharpCA10 59DS03HDead apart from neon glowingR703/705 68k hi res14-09-04
SharpCA10 59DS03HDead apart from power light2 x 560k start up res hidden under chopper heatsink14-09-04
SharpCA10 59DS03HDead with mains fuse o/cQ701 chopper FET s/c RH-TX0166BM22, D712 zener RH-EX0419BM22, BUH515 LOPTr - if stuck in st/by aft replacement Q702 BC338 in psu s/c14-09-04
SharpCA10 59DS03HField - no pic at top ? of rasterField stage is supplied with + & -ve supplies fused by F601/2. Check these & Q501/2. Q501 faulty & replaced with a IRFI9020 (uprated device)14-09-04
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