51KV1056 / SIERRA [TV]

• Tuning drift, when it is hot the tuning is lost on channel change.
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (with circuit diagram extract)
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (picture attached)
• Blue picture. Coloured lines. (SIERRA - 51KV1056 information)
• Field collapse normally with blank picture. (+ extract of circuit diagram)
• The removal of leaded diodes. (+ extract of circuit diagram)
• Whistling from PSU. (extract of circuit diagram attached)
• No output from the chopper power supply which uses a junction FET, whose gate and source are at 12V while 300V is present at the drain. (with circuit diagram extract)
• No start-up. Buzzing from speakers and working noise of PSU.
• Replacement of surface mounted diode 6637. (picture attached)
• Dead. Low frequency noise on sound.
• During picture changes sometimes a volume increase (plop) is heard. (with circuit diagram extract)
• No horizontal synchronisation. (part of circuit diagram displayed)
• Line output stage only starts up for a short time. (with circuit diagram extract)
• Intermittent green picture, channels cannot be programmed. (+ extract of circuit diagram)
• No switch on. Low noise on sound. (part of circuit diagram displayed)
• +9V supply modification. (extract of circuit diagram attached)
• No picture, sound ok but on turning up A1 control, frame collapse. (with circuit diagram extract)
• No switch on. Weak whistling noise from PSU. LED is OFF.
• No power with abnormal sound. (with circuit diagram extract)
• Only half a picture. (part of circuit diagram displayed)
• Modification at line transformer position 5530. (extract of circuit diagram attached)
• Switches off by itself. after a while. (part of circuit diagram displayed)
• No power supply start up in loaded condition (eg. with lamp).
• Intermittent colour and intermittent dark vertical bar on picture. (51KV1056 tips)
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning.
• Line output transistor becomes warm and in the course of time it becomes defective. (part of circuit diagram displayed)
• Set does not retune or program etc
• Set dead with just 5V on the 95V line. Standby LED is on but set won't start. (+ extract of circuit diagram)
• Line tearing and rope effect.
• Tuning menu can not be called. All other functions OK.
• Smeary, washed out picture with bent verticals. (with circuit diagram extract)
• Reluctant to start up from cold.
• Buzzing sound then switches off.
• Blank raster. OSD OK .
• Vertical vibration in cold condition of set.
• Store lock on the appliance.
• Enable Hotel mode. Disable hotel mode.
• No start up. No standby. Attempts to start up, but fails.
• Line output transistor fails repeatedly. (with circuit diagram extract)
• No picture. No audio. (+ extract of circuit diagram)
• New infra red receiver.
• No switch on after activating mains switch. Whistling noise. (with circuit diagram extract)
• Buzz in audio (intermittently). (part of circuit diagram displayed)
• No picture. No sound. Purring sound in loudspeaker. (part of circuit diagram displayed)
• Picture shifts. (with circuit diagram extract)
• Memory content dropout at positions 4 and 5.
• PSU does not start up, if appliance was switched off for a day. Appliance functions after short switch on/off. (extract of circuit diagram attached)
• Picture fails for a short time. (extract of circuit diagram attached)
• Local controls inoperative.
• Squealing from PSU.
• The remote control only controls the volume and sound-stop. No function with On-Off and channel change-over, although the display for the operation flickers.
• How to reset microprocessor.
• No functions. Slow start-up. (extract of circuit diagram attached)
• Programming unoperational. Limited sound adjustment possible.
• Wavy picture. on the right.
• The TV cannot hold the picture.
• No standby, humming and standby LED blinks.
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• Unregulated power supply. Pulsating picture and surging sound. (extract of circuit diagram attached)
• Description of SMPS. (picture attached)
• Tuning drifts. only on certain channels (after a while).
• Sound increases intermittently or "pops", especially during bright scenes. (part of circuit diagram displayed)
• Lines on picture after approx one hour. It consists of a band of bright white lines about two inches wide. (extract of circuit diagram attached)
• No start-up. intermittently.
• Menu rolling. (picture attached)
• Line output stage does not start up. (picture attached)
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (picture attached) (SIERRA - 51KV1056 information)
• Programme channel search cannot be called up.
• "Store" key does not work. (picture attached)
• Blank or green raster. Flyback lines. Faint picture or normal picture. (extract of circuit diagram attached)
• Defective IC7103 SV-production. (with circuit diagram extract)
• Memory loss. (extract of circuit diagram attached)
• Dead set. Tries to start. (51KV1056 SIERRA repair tip)
• No function at switch on from standby. Switches to LOCK (hotel) mode. (part of circuit diagram displayed)
• Set goes accidentally into hotel mode.
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound.
• Green picture with retrace lines. After a few restarts picture OK.
• Turns on automatically. No RC or front panel controls.
• Error codes.
• Comes on for a short time.
• Horizontal white line.
• Picture shifted to the left. intermittently. Line tearing. intermittently. (part of circuit diagram displayed)
• Drive for high voltage missing. (extract of circuit diagram attached)
• Becomes defective immediately after switch on.
• The fuse and the bridge diodes in the power supply blow.
• No start-up. when cold. (part of circuit diagram displayed)
• No voltage from PSU. (part of circuit diagram displayed)
• Reduced horizontal size. (part of circuit diagram displayed)
• Hotel mode.
• Settings do not stay in position.
• Lines across top of picture about 8" in first 100 lines. (+ extract of circuit diagram)
• PSU switches off with load at U95V. (+ extract of circuit diagram)
• Loosing colour during play-back of a video tape. (part of circuit diagram displayed)
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• Poor synchronisation. (picture attached)
• LED flashes once, then gurgles. (picture attached)
• Colour disappears with VCR-scan (picture search). (with circuit diagram extract)
• No functions, hum in loudspeakers. (with circuit diagram extract)
• Excessive HV. after a while.
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• Volume can't be tuned down. No tuning with RC. (+ extract of circuit diagram)
• Connection of the loop system to the TV.
• After switching on the CTV "EXT...1.2.3..." appears on the screen.
• Vertical collapse. (picture attached)
• PSU check.
• Power supply fault finding. (with circuit diagram extract)
• No start-up. Standby LED flashes .
• Blown chopper. (with circuit diagram extract)
• Hazy flickering picture at top. (with circuit diagram extract)
• To improve performance with prerecorded cassettes. (picture attached)
• No function. Standby LED flashes briefly. (with circuit diagram extract)
• No picture. OSD OK .
• Picture is faint with hanover bars. (picture attached)
• Hotel Mode activates by itself. (with circuit diagram extract)
• Dim picture with Hanover bars visible. (extract of circuit diagram attached) (51KV1056 SIERRA repair tip)
• No HV.
• After working normally for a while the TV blocks in any position. The functions do not work.
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• Picture shifted to the right. (extract of circuit diagram attached)
• Buzzing from PSU. when cold. (+ extract of circuit diagram)
• Intermittent audio and picture. (with circuit diagram extract)
• Reduced vertical size. at top.
• Limited volume. No channel search.
• Line output transistor TR7528 fails at switch on.
• No +9V, line output stage is OK. (extract of circuit diagram attached)
• 6613 type change. (picture attached)
• Picture displays lines and strange foldover effect at centre.
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• The picture is slightly yellow, flyback lines. Slightly noisy, no own recording possible.
• LED does not flash. Slight buzz in appliance. (+ extract of circuit diagram)
• Line transistor 7528 blows within 1 sec. (extract of circuit diagram attached)
• No line output stage. (picture attached)
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• Poor synchronisation. when cold. (with circuit diagram extract) (SIERRA - 51KV1056 information)
• SOPS defective. (+ extract of circuit diagram)
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (extract of circuit diagram attached) (51KV1056 SIERRA repair tip)
• Line down middle of screen. (+ extract of circuit diagram)
• Chopper inoperative. (+ extract of circuit diagram)
• No functions. Standby LED flashes. Relay switches to ON. (51KV1056 tip from SIERRA)
• Control micro processors.
• Does not shut down (when cold).
• Buzz in audio. No picture.
• Right side of picture discoloured.
• Excessive brightness.
• Microprocessor screening plate. (+ extract of circuit diagram)
• Whistle.
• Picture is mostly green with flyback lines after 10 secs from switch on.
• Tuning drifts. only on certain channels.
• Enter service mode.
• Intermittently dead. (+ extract of circuit diagram)
• Excessive horizontal size.
• Dead, very slight whistle from PSU.
• Vertical line. on the right half screen. (extract of circuit diagram attached)
• Picture centering has shifted horizontally. No OSD.
• Does not regulate +95V.
• Dead. Strange noises from PSU/ line output transformer. (with circuit diagram extract)
• Appliance can not be programmed. Search does not function. Only limited volume control.
• Standby LED lights up and switches off at power on. Appliance will not start up.
• Set comes on in store lock mode. (with circuit diagram extract) (51KV1056 tips)
• No start-up. (with circuit diagram extract)
• Bright flash on screen. No picture or sound. (with circuit diagram extract)
• Display goes to F1 a few seconds after switching the set on.
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• Connection of a loop system to the TV.
• No function, starts up from standby, then goes out.
• U743 tuner replacement. (part of circuit diagram displayed)
• Picture is poor with rippling on verticals. (picture attached)
• White unmodulated raster. Picture missing. (with circuit diagram extract) (51KV1056 SIERRA repair tip)
• Bright picture. Flyback lines.
• Occasionally appliance does not switch on from standby. No further functions are possible.
• Vertical size varies. intermittently.
• Programs and PP-settings cannot be changed.
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (+ extract of circuit diagram)
• Low audio. (part of circuit diagram displayed)
• Does not start. Slight buzzing in loudspeaker.
• No OSD. Picture OK .
• Rolling or jittering picture. (with circuit diagram extract) (51KV1056 tip from SIERRA)
• No picture and sound. Low hum intermittently, no function.
• Dark picture. Audio OK .
• No picture (when cold).
• Dead. Only hum from speakers. (+ extract of circuit diagram)
• No colour and vertical black bar across screen.
• Does not start up at once from cold.
• Dead. (picture attached)
• Low 5V to micro chip. (+ extract of circuit diagram)
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (with circuit diagram extract)
• Standby just pulsing.
• Line output stage does not function.
• Blank raster. Flyback lines. (+ extract of circuit diagram)
• Appliance is dead with standby LED flashing after a few seconds. (picture attached)
• No line start up; +95 available; +9V is about 4.5V. (+ extract of circuit diagram)
• Reluctant to start from cold (with circuit diagram extract)
• No line output.
• Trips. (picture attached)
• Slow hiccup (picture attached)
• Appliance will not switch on at times, but hums in the power supply section.
• The switched-mode power supply cannot be loaded.
• Dark picture.
• Modification to line transformer pos. 5530.
• Intermittently narrow picture, but corrects itself shortly after.
• Appliance does not function with standby light flashing.
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• Streaks in picture. Picture pulls and rolls intermittently.
• No start-up. intermittently (when cold). (extract of circuit diagram attached)
• No frame or short frame. (picture attached)
• Service manual correction. (with circuit diagram extract) (51KV1056 tips)
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (extract of circuit diagram attached)
• The tone (sound) tunes well, but the volume cannot be raised.
• Green screen with flyback line. No picture. OSD OK.
• Print with linearity coil pos. 5800. (51KV1056 SIERRA repair tip)
• Line tearing. on lower half screen. (part of circuit diagram displayed)
• Volume change with great fluctuations in brightness. (part of circuit diagram displayed)
• Two lines going around. (+ extract of circuit diagram)
• Picture shifted horizontally. (extract of circuit diagram attached)
• Slow start-up.
• No tuning bar when install button pressed and set not in hotel mode. (extract of circuit diagram attached)
• Failures in the power supply. (with circuit diagram extract)
• No picture. TXT OK . (part of circuit diagram displayed) (SIERRA - 51KV1056 information)
• Secondary main power supply OK except +9V at 5.8V
• No operation.
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (with circuit diagram extract)
• Difficult startup. Rattling sound from line output trafo.
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels.
• Dead with whistling noise coming from power supply. (picture attached)
• 10V on 95V line. (picture attached)
• No picture. Audio OK .
• Dead. At switch on the stand by LED flashes.
• +B very high. (+ extract of circuit diagram)
• No functions. after start-up (intermittently).
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (+ extract of circuit diagram) (51KV1056 tip from SIERRA)
• Microcomputers and screening plate.
• Green screen and at other times no tuning. (with circuit diagram extract)
• No vertical deflection. (extract of circuit diagram attached)
• Trips. at start-up (intermittently). (+ extract of circuit diagram)
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again.
• When switching on, only a 10cm stripe on top of screen, the rest of screen is black with flyback lines. After a while, stripe becomes wider. (part of circuit diagram displayed)
• Replacing the EAROM. (picture attached)
• Random breakdown of line output transistor. (with circuit diagram extract)
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink.
• To remove store/lock. (SIERRA - 51KV1056 information)
• Right hand side of screen has a line.
• Sound returns gradually after channel change. (part of circuit diagram displayed)
• Noise in audio.
• Protection device (thyristor THY6641) is triggered at switch on. (+ extract of circuit diagram)
• After operating for one hour it is no longer possible to switch over programmes not even from the front panel. Appliance must be switched on and off then it is possible to change channels.
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (part of circuit diagram displayed)
• Dead. Low hum.
• Line output transistor running hot. (picture attached) (SIERRA - 51KV1056 information)
• No sound or raster. The 95V HT supply is present at the line output stage but there is no line drive. (extract of circuit diagram attached)
• Correction to service manual LOT winding.
• No start up from cold and humming.
• Stuck in hotel mode.
• Switches to standby. (picture attached)
• Picture only in two bars in upper screen section, the rest is dark. (picture attached)
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• Line tearing, especially with bright scences. (with circuit diagram extract) (51KV1056 SIERRA repair tip)
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (extract of circuit diagram attached)
• Search jumps on UHF. (part of circuit diagram displayed)
• No picture. No sound. Switching on and off from Standby OK.
• No tuning. No channel lock. (picture attached)
• Dead due to action of over voltage protection circuit.
• No tuning. only on certain channels.
• Hums softly. (extract of circuit diagram attached) (SIERRA - 51KV1056 information)
• CRT types.
• Noise in sound. Mute does not function.
• Sound goes to max. intermittently and HT varies. (part of circuit diagram displayed)
• No regulation. (with circuit diagram extract)
• Bright flash on screen and no picture or sound after a few minutes. (part of circuit diagram displayed) (SIERRA - 51KV1056 information)
• Line output stage TS7528 is defective. (part of circuit diagram displayed)
• Enable Hotel mode.
• No sound or picture. Low hum from speaker. (with circuit diagram extract)
• Picture passes out in the centre.
• Height excessive. Defective linearity. Field blanking. (part of circuit diagram displayed)
• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (+ extract of circuit diagram)
• Does not switch on, standby LED OK.
• No SOP supply. (+ extract of circuit diagram)
• No or intermittent start-up. (+ extract of circuit diagram)
• Humming, motor noise and other unusual noises. Normal picture.
• No start up, just a buzzing noise in speakers. (+ extract of circuit diagram) (SIERRA - 51KV1056 information)
• Stops at start up. (picture attached)
• Power supply does not oscillate. (extract of circuit diagram attached)
• The following production changes were introduced to prevent the set coming on in the store lock mode when switched on from standby. (+ extract of circuit diagram)
• No picture. (part of circuit diagram displayed)
• Defective purity.
• Programme tuning difficulty, stations shifted on tuning bar. (+ extract of circuit diagram)
• Tuning drifts. (part of circuit diagram displayed)
• Dead. Low level buzz from loudspeaker. (with circuit diagram extract)
• No function. When switching on with RC, standby LED lights up. (part of circuit diagram displayed) (51KV1056 SIERRA repair tip)
• Tripping. (with circuit diagram extract)
• Slow start up of power supply. (+ extract of circuit diagram)
• Excessive vertical size.
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (extract of circuit diagram attached)
• No tuning. (picture attached)
• No HT from chopper circuit. (with circuit diagram extract)
• Red picture. Flyback lines.
• High voltage transistor defective after a while.
• No transmitters to adjust and the sound is not controllable.
• No colour in OSD.
• Green raster. Faint picture. Flyback lines.
• Searches for channels continuously. (part of circuit diagram displayed) (51KV1056 SIERRA repair tip)
• Picture separating line appears. Whistling.
• No functions. when cold.
• New IR receiver.
• Colour flickers. No colour. after a while. (part of circuit diagram displayed)
• Intermittent destruction of line o/p transistor. (with circuit diagram extract)
• Loud chriping after switch on. It becomes lower after a short time.
• Vertical roll. (part of circuit diagram displayed) (51KV1056 tip from SIERRA)
• Dim picture with Hanover bars.
• No functions. Sound buzzes in loudspeaker. (with circuit diagram extract)
• Intermittently dead. after start-up.
• Volume varies. depending on picture content. (+ extract of circuit diagram) (service info for SIERRA -51KV1056)
• No channel search. No OSD. (picture attached)
• Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel will not change. (extract of circuit diagram attached)
• Cannot be programmed and search does not function. Only limited volume adjustable.
• No freeze frame or intermittent freeze frame; no sound. (with circuit diagram extract)
• No colour. (+ extract of circuit diagram)
• Intermittent colour.
• Error messages indicated by front display flashing. (with circuit diagram extract)
• Cannot change tuning or stored settings. (part of circuit diagram displayed)
• Interference in audio. Interference in picture. (extract of circuit diagram attached)
• No picture and sound intermittently after switch-on. Buzz sound from speakers. (picture attached)
• Initial volume-level is higher than the maximum Hotel-Mode setting.
• Blank raster. No audio. after a while. (picture attached)
• Adjustment of +95V. (extract of circuit diagram attached)
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes.
• No tuning, no remote volume control. (picture attached)
• Green picture. (extract of circuit diagram attached)
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (extract of circuit diagram attached)
• No function. Standby-LED lights up. Appliance switches on but no picture or sound.
• Production change to line drive. (+ extract of circuit diagram)
• No tuning possible, F2 appears on bottom of picture and S1 on top.
• Skips channels during tuning. only on certain channels.
• Stuck in standby. (+ extract of circuit diagram) (service info for SIERRA -51KV1056)
• Line out of phase. Black band in centre of screen. No colour.
• Intermittently no picture and sound at switch on. Buzz from speaker. (extract of circuit diagram attached)
• Quick hiccup. (+ extract of circuit diagram)
• Picture appears slowly.
• Stations won't change. Picture and sound OK. Other functions OK.
• Poor reproduction of copy protected tapes. (+ extract of circuit diagram)
• Skips channels during tuning. (picture attached)
• Does not stop on stations.
• No picture, only squeaks for a short time at switch on then no more functions.
• No voltage from PSU, computer does not work. (extract of circuit diagram attached) (51KV1056 tips)