Sony TV Repair: Common Faults and Solutions.


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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYKV25XBR
No displayTwo problems: 1) volume changes activate rgb mode. found rgbbutton jammed closed. 2) no channel/function display. found l101 on thea board to be open. there is 5v active low info. present at ic104/p12.
SONYKV2680R
No sound/pix, cold solder on 12v rectifier d-506This unit had no sound or picture.
SONYCFS88S
Audio from tape is distorted/low pitchThe motor was running about 25% too slow.
SONYKV2675R
Horiz output transistor runs hot, replaced t-501The horiz. output transistor ran hot on this unit.
SONYKV2680R
No audio, replace ic1107 and add capacitors/diodeThe customer informed me that just before the sound went bad,they heard a loud snapping noise. i feel when the set is new and thetube snaps during its breaks in period, causes the ic1107 to become defec-tive. -hq comments: to protect ic1107 from static
SONYKV2141R
Horizontal frequency of - high pitched squeal, solder l801Horizontal frequency off produces high pitched squeal.
SONYD5
Sled moving to outer edge upon power upOn power up sled moves to outer edge of disc. pin 68 tc201 isproper level. the only unusual signal is ic501 #23 which goes negative(5v). changed chips (ic801, ic501) no change. -hq comments: (found over the phone that disc did not rotate while sledmo
SONYTC44
Part number neededNeed part number of gear (c) for tc-44. i have informed theservicer that the part may no longer be available. -hq comments: fortunately, the part is in stock at npc. part number is3-550-026-00.
SONYWMD6C
Motor does not turnThe customer told me that he plugged in 12vdc instead of 6v.the amplifier section was fine, but the motor did not turn.
SONYCFS300
Part number incorrect - ic3On page 18 and again on page 20, ic3 is stated to be a la4126.on page 29 of the parts list, it is a la4125t. which is correct? theseare not listed in the handbook as being interchangeable. -hq comments: the correct part is la4125t. part # is 8-759-80
SONYCCDV8
Tape jamTape broken and wrapped around top of drum assembly.
SONYTCFX510R
Replacement of panel and buttons for rec and rec muteServicer would like to replace panel and buttons for rec andrec mute however, these buttons are not shown separately on page 35 ofs/m. can we get these or do we have to replace entire front panel assy? -hq comments: the rec and rec mute buttons are par
SONYBMC110
Units deadUnits doa. after making basic tests, found pin 38 (reset)held at 205 volts. syscon ic301 not able to reset. located leaky capaci-tor c341.
SONYXR70
Noise on the outputs in tape modeEvery xr-70 i have worked on has a motor noise in tape modethat is noticeable at low or no volume. -hq comments: head amp may be picking up motor noise as they are locatedclose to each other. try a shield around the motor.
SONYTCFX1010
Communication with asp chipAlways in muted mode. tape plays, meters correct. in recordmode there is no control of level (rec) even though the attenuator reads-70db. ic710/703/704/309 replaced. all power supplies were within 0.3v.
SONYWM10RV
No auto stopThe unit did not stop or switch the direction automatically.
SONYWA16
The unit changes direction fwd/rvs by itselfThe unit changed the direction rwd/rvs by itself. alsonoticed the take-up and the supply reel did not turn.
SONYRS20
No outgoing messageWhen we try to record the outgoing message, it rewindsadvances 33 reel count and seems to record the message. however, when wepush the in/out switch to out in order to monitor the recorded message,the unit makes the error beep.
SONYWA11
No audioThere was no audio coming out from the speaker.
SONYRT44
No playThe unit did not play tapes. the take-up reel did not turnand the head base did not go up.