TV Repair: Common Faults and Solutions.
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Results: 87426
Results: 87426
Repair Guide: Common Issues and Fixes
| Brand | Model | Fault | Detailed Problem | Solution | By |
|---|---|---|---|---|---|
| SONY | CFDD77 | Service manual correction | P40 of manual shows connection to ov ground for fe, te adj.should really be connected to 2.5v reference, cn721, pin 10. -hq comments: you are correct. the ground input of the oscilloscopeshould be connected to vref., pin 10 of cn721. we will inform to | ||
| SONY | ITK300 | Sidetone/voice output low in amplitude | Sidetone and voice output low in amplitude. receiver sectionok, tone dialing ok. found r116 unsoldered at pin 15 ic101 speech networkchip. | ||
| SONY | CDP110 | Spindle motor runs backwards | Spindle motor runs backwards. unit was serviced at a dealerwhere the spindle motor had been replaced. | ||
| SONY | KV2782R | Intermittent shut down and/or horz freq drift, replace r-515 | Horz. freq. would drift off. a service call made to re-adjusthorz. freq. control. customer then complained unit would shut down sometime and horz. would drift. many parts were tried before r515 was con-firmed. solution: replace open resistor (r515). | ||
| SONY | ITA550 | Unit locks up | Unit would take 1 message then lock up. | ||
| SONY | TCU270 | Capstan motor is always energized | This unit maintains capstan motor running for as long as thesystem power is activated regardless if the cassette deck is in the oper-ating mode. this causes excessive wear on the mechanical components. | ||
| SONY | KV1972R | What is function of di0de/not listed on diagram | Diode is mounted between pin 4 and 7 of ic105. diode notlisted in manual. -hq comments: the diode itself is as follows: rd 13eb2, part number8-719-100-68. if servicer replaces the ic105/upd6250c, this diode is nolonger necessary. (the diode is just | ||
| SONY | SLHFR70 | No tuner audio | No tuner audio. ta mute (ic301-11) high. found l006 on ti5disconnected at collector of q003, preventing h sync from getting to ic301on sa10. | ||
| SONY | CCDV9 | Service manual error | Part number listed in manual (above) is incorrect. it is forcx522-153. research revealed that the correct part number is 8-759-112-97for the upd78112gf-505-3be. -hq comments: please refer to service bulletin csv-3 no. cam0032. | ||
| SONY | SLHFT7 | Intermittent no audio (r-chan only) | Ckt. board pattern open from pin 15 of ic003 to pin 2 of ic202(via c201). | ||
| SONY | TAAX320 | Sub part does not fit | Original switch part number 1-553-318-41 subs to 1-553-318-31.the sub part will not mount due to the screw holes that mount it notaligning with the holes in the frame of the unit. please advise. -hq comments: i had kcp check this out. the spacing betw | ||
| SONY | BMC550 | Poor color - very low green and blue | The unit recorded very poor color with almost no green andvery little blue. we found the problem to be caused by a (noseeum) acrossrv70 on the pm-2 board. there was approx. 150Ω to ground from thehigh side of the control. this of course loaded dow | ||
| SONY | KV2675R | Unit stays in sleep mode, ic-104g | The unit was in the (sleep) mode and acted as if the upc wasnot receiving a vert pulse. upon examination, we found the vertical pulseto be only 1vpp at ic103/p.4. this was caused by a defective charactergenerator, ic104 loading the line down. replacem | ||
| SONY | KV25XBR | Screen half dark | The left side of the screen was lighter than the right. also,the video was smeared. we found the problem to be caused by c1658-it hasopened up. this capacitor filters the b+ to the rgb drivers. replacementresolved the problem. -hq comments: c1658 is | ||
| SONY | VTX1100R | Display unstable | The display was very unstable. we found that there was ex-cessive noise on all the b+ lines. this was due to an open decouplingcapacitor - c135 in the dc-dc converter. replacement resolved the pro-blem. the tip off was the fact that the converter was | ||
| SONY | KV2735R | Pic instability when using video disc player, q-353 removed | When using a video disc player, the picture would jump ver-tically whenever there were rapid changes in brightness. we resolvedthe problem by defeating q353. this prevented the vert. pulse from beingexcessively processed. all input modes work correctl | ||
| SONY | SL300 | Will not thread tape all the way | The unit would load the cassette and thread about 1 inch andthen eject the tape. we found that the capstan motor was not turning andwas the cause of the problem. replacement resolved the problem. | ||
| SONY | SL250 | No tuner vc | No vc voltage for the tuner, unable to tune differentchannels. (also s/n 810516, 813107) | ||
| SONY | SLHF1000 | Service bulletin no. 312 | This service bulletin has incorrect information. the correctpart number for q830 a dtc144es is 8-729-900-89. also the diagram forvi-18 mount side is incorrectly drawn. it should look like this correctedversion. -hq comments: a revision on this servic | ||
| SONY | CDPC5F | Service mode test procedure | The method of grounding pin 2 of cnp 521 and pin 8 of ic505does not enable the disc to spin. it will check front panel functs. butcannot make rf adj. or ef adj. -hq comments: this method came from tokyo. we did not know this pro-cedure did not work un |