56KS3400 / SIERRA [TV 56 (52) cm picture]

• Teletext lines disappear (about 9 lines). (with circuit diagram extract)
• Frame rolls, jitters or picture unstable. (picture attached)
• IF information for stereo appliances, combi tuner and two-tuner appliances.
• For initial 10 minutes the picture is dark. (picture attached)
• Hum when volume off. Hum in low sound passages. (picture attached)
• Picture is crooked on either side (E/W). (picture attached)
• Tripping. intermittently. Pincushion distortion. on sides. (picture attached)
• Picture rolls in at the bottom. Vertical lienarity error.
• Jamming on vertical lines when switching set on in cold conditions. Visible with crosshatch pattern or with pattern lines.
• Other frame problems. (part of circuit diagram displayed)
• Excessive brightness. Flyback lines (intermittently). (extract of circuit diagram attached)
• Incorrect teletext character height.
• Safety test after repair.
• Automatic tuning does not stop when finding a station, although it scans bands ok. (picture attached)
• Poor or slow search.
• Excessive brightness. No picture. Retrace lines.
• No picture. after a while. Audio OK .
• Loss of tuning point after operating for some hours.
• No sound. Picture cramped by 5cm up and down.
• No picture. Audio OK . (picture attached)
• + 140 V present, no H.T.
• When changing to certain programmes the picture is not good at the beginning.
• Colour varies. (extract of circuit diagram attached)
• The picture turns blank, the sound sometimes disappears caused by TXT.
• No E/W correction. (picture attached)
• Frame synchronisation or synchronisation defects. (picture attached)
• When tuned in goes slightly off tune.
• Set dead, no 140V HT, 12V feed to the power supply is low.
• Distorted picture. (part of circuit diagram displayed) (56KS3400 tip from SIERRA)
• Dead. (+ extract of circuit diagram)
• Brightness fault. (extract of circuit diagram attached)
• Low picture amplitude. Approx. 3cm wide black edge on top and at the bottom.
• Picture tube A37-570X.
• Blurry picture. Audio OK .
• Will not lock onto station during sweep tuning. (extract of circuit diagram attached)
• Creaking.
• The picture briefly disappears.
• No RC functions (intermittently).
• Flashing picture. Picture too small.
• Increased picture width. Sideways distortions.
• Sync IC (TDA3571BQ) replaces IC TDA2571AQ.
• Picture is very dark, looks like a low voltage on CRT. (extract of circuit diagram attached)
• If appliance is cold it ticks; if it is warm, it runs ok; if power supply voltage is less than 220V, it ticks. (+ extract of circuit diagram)
• Connection of a loop system to the TV.
• Dead. Comes on in standby if switched on at mains plug and if made to come out of standby by pressing on/off switch the standby light goes off.
• Switches to standby.
• Insufficient brightness even if adjusting to maximum with RC.
• Resistor R303 (2.2 Ohm) blows continuously.
• No picture, no sound, high voltage and the display indication is present.
• Colour varies until black/white when the appliance is warm.
• After switching on approx 10-15 times the appliance cannot be switched on any more. Only the left volume balance light is still on. No picture and no sound.
• Height problems. (part of circuit diagram displayed)
• Fuse 2A on rectifier module goes defective after around 4-6 weeks. This always happens when switching on a VH appliance.
• After it has been switched on the TV switches off then switches on again, picture is faded (green). EHT discharge.
• Picture is cut off at the bottom and black bar.
• Vertical collapse. (part of circuit diagram displayed)
• No picture. (with circuit diagram extract)
• Intermittent colour. (extract of circuit diagram attached)
• LED display is distorted. No control.
• Intermittent low gain.
• V2000 loss of colour.
• Picture has strong "Moire" interference.
• Trapezoid picture.
• Dark screen, blank if brightness is increased. (SIERRA - 56KS3400 information)
• Flickering picture. (with circuit diagram extract) (56KS3400 tip from SIERRA)
• Too bright. Coloured flyback.
• Snow in picture.
• Continuously discharges between tripler and earth. (56KS3400 tip from SIERRA)
• Defective vertical deflection (oscillograms missing on the V deflection unit). Dark picture. (with circuit diagram extract) (service info for SIERRA -56KS3400)
• No vertical synchronisation.
• Constricted raster. (+ extract of circuit diagram)
• Set won't lock to channels in the search tuning mode, with no signal present. The line oscillator sounds way off frequency. (+ extract of circuit diagram)
• Line problems. (part of circuit diagram displayed)
• No picture, sound is present. Rastergrid lines present when switching off. (with circuit diagram extract)
• Defective vertical linearity.
• Distorted audio. (picture attached)
• Blank raster with bright, blurred flyback lines. (picture attached)
• Pal/secam transcoder.
• E/W fault. Excessive horizontal size.
• Went up in smoke.
• No vertical deflection. (extract of circuit diagram attached)
• Contrast problems. (+ extract of circuit diagram)
• Procedure to obtain a better sync.
• Reduced vertical size. (part of circuit diagram displayed)
• The TV does not switch on but fluctuates. (part of circuit diagram displayed)
• Lines in picture when using Japanese video appliances.
• When transmitting, a "second language" comes through. (extract of circuit diagram attached)
• Display initially shows 1, then E1 and E0 at switch on. Noise in picture and no control when EO in display.
• Store standard values.
• No channel search. Display OK .
• Dark picture.
• No functions. after start-up (intermittently). (part of circuit diagram displayed) (56KS3400 tips)
• Reduced vertical deflection.
• The appliance loses all the stored stations, works without the battery.
• With "scan" playback of VLU plates, rattle on appliances with mute switching. (with circuit diagram extract)
• The operation functions do not function The display functions.
• Blank raster. Searches for channels continuously.
• Clock problems.
• Line output transistor (BU208A) fails.
• The letters tip over during video text.
• Horizontal jitter.
• No TXT.
• Vertical lines.
• Memory loss in appliances with VST system.
• Picture like when there is loss of channel and recovery. No sound. (with circuit diagram extract)
• Processing of "non-standard" signals.
• Moire interference on channel S11 with K35 on S channels.
• Squealing noise. (extract of circuit diagram attached)
• Intermittently switches to STEREO or second language.
• Replacing prescaler module U18.
• Blank raster. Audio OK . (part of circuit diagram displayed)
• Distorted TXT reception (signal OK). TXT module used consists of U125 and U127 (thick film).
• On different channels the video tuner sound is missing. Sometimes the sound is present for a short time and then fails.
• Interference on channel 2 with TRD4 system.
• No switch from TXT mode to TV mode and TXT picture appears excessive. (+ extract of circuit diagram) (56KS3400 tips)
• No RC functions.
• No picture or audio. Blank raster. Everything is OK after warm-up.
• Sticks in stand-by. Appliance only starts up when plug V23 has been removed. No display.
• Picture shifted horizontally. (with circuit diagram extract)
• The picture is streaky and there is no UHF reception in high ranges.
• Service tips for Japanese VCRs.
• Replacement for U341 tuner.
• Electronic protection responds.
• Error codes. (extract of circuit diagram attached)
• No functions. No display.
• No reception during switch on.
• Mains switch and speech/music switch.
• Loss of display when switching over. Returns but disappears again after a few mins.
• Picture too small. (+ extract of circuit diagram)
• The picture pulls on the upper side of the picture. (part of circuit diagram displayed)
• No picture. No audio. Fault occurs intermittently. .
• No synchronisation on appliances with fitted TXT. (extract of circuit diagram attached)
• Extension print (SBC 312).
• Video is missing, small amount of chroma. (+ extract of circuit diagram)
• White screen. Flyback lines. Fault occurs intermittently. .
• The television gurgles. (extract of circuit diagram attached)
• E.h.t. leakage at the tube.
• When sweep tuning, station lock does not function. (part of circuit diagram displayed)
• Insufficient brightness when switching on. Shortly after, becomes brighter (looks like bad CRT).
• No picture, No sound. Picture is grey. Balance display on the left.
• + 12 V on pin 10 of U2 not present.
• Blank screen. High voltage and display OK. (SIERRA - 56KS3400 information)
• TXT reception problems with K30/K35 chassis. (picture attached)
• Hiccups from PSU when fluorescent light is switched on/off. (56KS3400 tip from SIERRA)
• Does not stop on K5 and/or K21 in search mode.
• Venetian blind effect. (picture attached)
• 2-3 flyback lines in top of picture. (part of circuit diagram displayed) (56KS3400 tips)
• Interference caused by rays from medium wave band transmitters. (extract of circuit diagram attached)
• Station search runs through stations, Stop command present.
• No contrast control.
• Print plate 256 divider U18.
• Change from TRD to TRD-ECO.
• On some channels when appliance is in mono it switches to stereo for a short time or audio channel 2 has a lot of audio interference. Repeats in irregular intervals.
• Faint flyback lines plus shading at one side. (56KS3400 tips)
• No start-up.
• No colour (intermittently). (+ extract of circuit diagram) (service info for SIERRA -56KS3400)
• No display.
• Line output transformer information.
• Horizontal lines run through the picture with playback of the VP 720 scart.
• Disconnection from the operating unit - chassis.
• Defective infra red control. (56KS3400 tips)
• E/W fault. (with circuit diagram extract)
• No tuning. (part of circuit diagram displayed)
• Horizontal lines in the picture and the colour sways.
• When tapped goes into standby. (picture attached)
• No start-up. intermittently.
• Smoke from air vents in back cover at switch on.
• During switch on the display does not work.
• Picture shadow a little to the right of the real picture. Visible before with test picture. Vertical raster lines cast a clear shadow on the left and right side of the circle, also with subtitling.
• Appliance switches off and back on when swift increase/decrease of voltage occurs.
• Horizontal shaking. after start-up.
• Teletext information moves.
• No channel storing.
• Does not change channels. No audio.
• Set intermittently goes off or into standby when lightly tapped anywhere.
• Memory loss. at switch-off.
• + 140 V not present. (service info for SIERRA -56KS3400)
• The TV switches on regularly after which the raster appears only with a snowy effect. On the screen there are also horizontal white bands. Tuning voltage is blocked.
• Slow warm up, first five to ten minutes picture dark with a restricted brightness control range. (with circuit diagram extract)
• Teletext faulty. replaced 2 text IC's now text on screen but picture still visible in background with grid effect.
• Protection circuit active (set hiccups).
• Replacement of tuner ECL2006 with UV418.
• Only snow in picture. After pressing cassette player channel no. appears but snow remains. Tuning voltage is 33V.
• After playing for some time, picture goes dark (2-3 times per evening).
• Zigzags. IC 3571BQ does not meet specifications. (part of circuit diagram displayed)
• Tuning drifting with horizontal white bars.
• The cable television picture rattles on several stations (during VHF or UHF or on both channels).
• Three types of line transformers.
• Faint flyback line. (+ extract of circuit diagram)