21D81 / INTERFUNK [TV]

• Stops after 5 seconds. No standby LED. (extract of circuit diagram attached)
• Line transformer starts up but no display, nothing on the screen and no sound. (picture attached)
• No control and cannot be switched off when started up from standby.
• Line output stage fails at switch on. With load (lamp) appliance can be switched on with squeaking noise. (extract of circuit diagram attached)
• Line synchronisation available only after 2 mins.
• Dead. after start-up.
• Black bars on the bottom of picture. If V-amplitude is altered, picture disappears on the bottom. (with circuit diagram extract)
• Very pale picture which is shifted to the left. Voltage is correct. (extract of circuit diagram attached)
• Does not go into TXT mode. Mixed mode possible.
• Distorted vertical linearity. Barrel distortion. (+ extract of circuit diagram)
• Intermittent flyback lines. Grey scale varies intermittently. Possibly no picture.
• Standby display lights up briefly, then no function.
• Buzzing at start-up.
• Picture shifted horizontally. (+ extract of circuit diagram)
• No start-up from standby. (21D81 INTERFUNK repair tip)
• Vertical and horizontal synchronisation available only after 2 mins.
• No horizontal or vertical deflection.
• Hums at switch on, dies out slowly.
• Picture rolls. when cold. (picture attached)
• Only snow in the picture, after changing the tuner the fault is still there.
• Bright raster. Flyback lines.
• EHT is heard starting up then everything stops 4 secs later.
• Does not go into text mode, mix mode is not possible.
• No colour (intermittently).
• Does not start up each time. When it functions, whistling and modulation of picture. This gets less in time.
• Text selection is not possible, takes only Mix or full text but not both. Also various other functions are defective.
• No start-up. (extract of circuit diagram attached)
• Unstable picture. (with circuit diagram extract)
• The teletext contrast is considerably too high after installing the teletext decoder.
• Excessive horizontal size. (+ extract of circuit diagram) (21D81 INTERFUNK repair tip)
• Black picture. Sound OK. Picture is OK after restart. (part of circuit diagram displayed)
• No colour.
• Pincushion distortion.
• Dark screen. on the right. (extract of circuit diagram attached)
• Shadowing effect, left side of picture is brighter than the right one. (+ extract of circuit diagram)
• Resistor R775 is defective.
• Shuts down. after start-up. (part of circuit diagram displayed)
• Noise in the speakers and no start up or display on the front panel when switching on. (picture attached)
• FBT blows after a few mins. (with circuit diagram extract)
• Power supply seems to remain in safety mode. (+ extract of circuit diagram)
• Dark picture.
• Left picture side is brighter, even via AV. (+ extract of circuit diagram)
• Centre of snowy picture is darker than edges. (part of circuit diagram displayed) (21D81 tips)
• HV arcing. (part of circuit diagram displayed)
• Stuck in standby; RC ineffective. Stanby LED flickers. (+ extract of circuit diagram)
• Intermittently line tearing in the middle (approx. 20cm wide). (picture attached)
• Does not switch ON. No power light showing.
• Transistor T701 fails when appliance is switched off and on.
• Secondary voltages appear for 1 to 2 secs. then nothing else. Standby LED switches off.
• At switch on appliance pulsated then reverts to standby again.
• Stuck in standby.
• Double picture. (service info for INTERFUNK -21D81)
• At Power On standby LED switches off immediately after switching on.
• Bright vertical stripes. No picture content. Sound OK. (with circuit diagram extract)
• Builds up high voltage for a short time and then switches off. (picture attached)
• At switch ON, set screams. Pressing on the on/off switch gives same condition. Standby LED's off.
• Picture has moved approx 10cm to the left. Vertical black bar with a few coloured streaks. Colour OK. (extract of circuit diagram attached)
• Horizontal jitter. Vertical jitter. (with circuit diagram extract)
• Slightly wavy picture in the middle of the screen. (part of circuit diagram displayed)
• When ON/OFF switch is pressed LED lights up and then switches off. If line BU is replaced by lamp, it lights up and collector goes down to 124V instead of 155V. (+ extract of circuit diagram)
• Excessive HV. (with circuit diagram extract) (21D81 tips)
• Long picture at start up, black screen with rainbow spots.
• Reduced contrast, especially on one side of the screen.
• Tripping.
• No PSU start-up.
• Impossible to adjust synchronisation. Picture shifted towards left. Right side of picture reduced by 8cm. (part of circuit diagram displayed) (service info for INTERFUNK -21D81)
• No vertical deflection. intermittently.
• No synchronisation during the first few mins. (+ extract of circuit diagram)
• Picture appears slowly. (+ extract of circuit diagram)
• Line BU voltage = 140V. Value of capacitor C701 (in PSU) illegible. Still no display if line BU disconnected. (with circuit diagram extract)
• NICAM check.
• Picture is brighter on the right. Poor synchronisation after program switch-over. Picture becomes brighter and darker in AV. (with circuit diagram extract)
• PSU pulsates. Sound crackles. After few secs. appliance works fine.
• Picture only appears about 3 mins after switch on, when appliance is cold.
• Picture too big. (with circuit diagram extract)
• No start up after changing FBT and constant whistling noise. (picture attached)
• Output transistor (S2000) fails when started from cold.
• Defective linearity.
• Picture shaking in a random direction. (+ extract of circuit diagram)
• Picture shifted to the left. Sometimes picture fails completely, then still only picture blanking stripes visible. (extract of circuit diagram attached)
• Unstable horizontal picture.
• Horizontal synchronisation fault even after replacing TDA8372. Weak adjustment with pot R634. Line synchronisation OK. Comparator OK. Horizontal linearity is OK. (with circuit diagram extract)
• Poor vertical linearity at the bottom, also E/W error.
• No HV.
• Remains in standby. Starts up when wiper forced. 88 on display. No picture and no sound. Goes into standby as soon as switch is released. (+ extract of circuit diagram)
• PSU doesn't start up when cold. (+ extract of circuit diagram)
• Motorboating noise at switch on. Pin 13 of the TDA8372A is unsoldered. TV no longer pulsates. Power supply voltages ok. (extract of circuit diagram attached)
• Front LED briefly lights up at switch on then it switches off. LED remains lit when mains plug is connected and disconnected but it definitely switches off at start up.
• No HT output from power supply. OK in standby. (+ extract of circuit diagram)
• Rattling noise or bubbling at start-up (when cold). (picture attached)
• Cuts out after switch on, soft hum from the speakers in standby mode.
• Brightness differs between left and right hand side of the screen.
• Power supply defective after a few days. (with circuit diagram extract)
• Power supply hiccups.
• Vertical line tearing. intermittently.
• Comes on for a short time. (extract of circuit diagram attached)
• When TV started up, transistor (S2000AF) instantly burn out. (picture attached)
• PSU starts briefly, then no more HV. (extract of circuit diagram attached)
• Loses sync at start-up for a few minutes.
• Horizontal stripe. in the centre.
• The picture is too large and wavers. (21D81 tips)
• At switch on picture is condensed tnen enlarged. Pops loudly at approx 2 pulses per sec. Intermittent blast from speakers. (+ extract of circuit diagram)
• E/W fault. (+ extract of circuit diagram)
• No picture. on lower half screen. (part of circuit diagram displayed)
• No picture. Audio OK . (picture attached)
• No audio (when cold).
• Random operation commands.
• Attempts to start with no result. (+ extract of circuit diagram)
• After approx 20 mins colour TV switches off.
• Whenever a function is requested display lights up then switches off. (service info for INTERFUNK -21D81)
• Poor line and picture synchronisation when cold.
• Wavy picture. at top. (part of circuit diagram displayed)
• Poor audio.
• No picture (intermittently).
• No picture. Hum in audio.
• PSU doesn't start-up or only after a while. Cracking sound.
• Resistor R515 becomes defective. (+ extract of circuit diagram)
• Does not fully go to TXT or only blue mix TXT. (+ extract of circuit diagram) (INTERFUNK - 21D81 information)
• No functions.
• Control unit does not function. Does not switch on. (+ extract of circuit diagram)
• Intermittent no image or yellow colouring. Knock sensitive. (+ extract of circuit diagram)
• Cycles on/off.
• Whistling HT. No start up due to incorrect HT frequency. May blow S2000 immediately. (with circuit diagram extract) (21D81 tips)
• Poor PSU start-up or BU defective. (+ extract of circuit diagram)
• Intermittent loss of brightness, picture is black. Can be adjusted with RC. Or vice versa, picture is too light and can be adjusted. (INTERFUNK - 21D81 information)
• Faint and too dark picture. Low brightness, contrast cannot be adjusted. Colour is adjustable.
• Eliminate safety mode of PSU.
• At the top edge of the picture an unusual stain effect appears and line tearing.
• No start up after changing IC601. Nothing lights up on the front.
• Can be switched to standby only if power plug is pulled out.
• Hums at switch on. (with circuit diagram extract)
• As described in the manual it is possible to operate the video recorder on all program places through the aerial. But some appliances only change over on channels 37-39.
• Halts at switch on when cold. No start up. OK after a few attempts. (with circuit diagram extract)
• E/W-fault.
• Switches to standby when mains switch is plugged in. Switches off when using RCU. (with circuit diagram extract)
• The plug receptacle of the teletext decoder, which is contained in the additional component, does not fit mechanically into the socket receptacle of the appliance chassis.
• Line tearing. at top. (extract of circuit diagram attached)
• Horizontal synchronisation fault, picture shifted towards left side. (picture attached)
• Picture distorted, shifted upwards and a little bit too wide.
• Sound channel 1 and 2 voltage level adjustment.
• Black bar on the right side of the screen. Similar to displacement. (extract of circuit diagram attached)
• Goes into PAL reception when in NICAM reception on channel 64, programme N1.
• Channel TF1 (channel 22) does not hold in SECAM: remains in PAL. The other channels are normal.
• Dark screen at start up. Line transformer ok with flyback lines. Top 2 or 3 lines ok. In PB apparently functions around the IC TDA8372A. (with circuit diagram extract)
• No raster sync in HF. Ok in scart. (picture attached)
• No TXT (intermittently).
• Intermittently dead. (part of circuit diagram displayed)
• Poor shading of picture, dark on one side and light on the other. (+ extract of circuit diagram)
• Does not switch to standby. (with circuit diagram extract)
• High voltage build up for short time then PSU switches off. (+ extract of circuit diagram)
• Collapses at start up, then switches off.
• Wavy vertical lines in the entire picture when cold. Picture jitters. (+ extract of circuit diagram)
• Line transistor S2000AF defective at switch on from cold. (picture attached)
• Picture shifted to the left, too small and not adjustable. (+ extract of circuit diagram)
• Bright picture. on the right. Dark picture. on the left. (part of circuit diagram displayed) (21D81 tip from INTERFUNK)
• Unusual TXT.
• No tuning. Higher channels in band I/III/V are not received.
• Picture with vertical and horizontal lines (when cold).
• Picture collapse on half of the picture.
• Automatic B/G-L detection does not work correctly with the Nicam sound carrier (TF1, FRANCE 2).
• Distorted picture. on the right. (part of circuit diagram displayed)
• Line frequency changes downward (squeaking, whistling).
• Horizontal picture position is incorrect, 5cm to the left. No picture intermittently. (+ extract of circuit diagram)
• White horizontal stripe about 5 cm from the bottom. Picture content bellow stripe is altered and noisy.
• Dark screen, only diffuse glow.
• Vertical jitter. when cold.
• From a cold start line output stage transistor fails.
• Flashing picture. (+ extract of circuit diagram)
• Blue, vertical stripe in the right third of the picture. (21D81 INTERFUNK repair tip)
• PSU is defective. 300V is present.
• Display flashing and rattles at switch on. (extract of circuit diagram attached)
• E/W trapezium does not function.
• Vertical lines. No colour. after a while.
• Vertical IC fails. (with circuit diagram extract)
• Low brightness. Picture too big. (service info for INTERFUNK -21D81)
• High voltage runs high. Flashover all over.
• Ok with signal. Without signal: unstable line frequency, line stage transformer makes a loud whistling noise and T511 (scanning transistor) shorts. (+ extract of circuit diagram)
• Illegible display. (+ extract of circuit diagram)
• Reduced raster size. (part of circuit diagram displayed)
• Noise in picture. Poor horizontal synchronisation.
• 88 shown on LED display.
• White screen. Flyback lines.
• Poor PSU start up. Severe crackle in the loudspeaker.
• Convex picture. Defective lower linearity. (extract of circuit diagram attached)
• No start up, no standby light, variable voltage on pin 16 of IC701. (picture attached) (21D81 tips)
• Picture shifted to the left. Alignment works normally. (part of circuit diagram displayed)
• Vertical dark bands running from left to centre of picture and separated by approx. 5cm.
• Coloured lines (RGB test lines) in top of picture.
• Approx. 1cm bright, vertical line on the right hand side of the picture approx. 10cm from the edge.
• Motorboating noise at switch on then goes into standby. When frame IC is unsoldered TV starts up. (extract of circuit diagram attached)
• Picture with a 10cm vertical band on the right side. Negative picture behind this black band.
• 10cm black bar on the right of the screen. Voltages ok, corrections work. (extract of circuit diagram attached)
• Dead.
• Focus problem. Blurred vertically, ok horizontally after replacing microprocessor and line transformer.
• Enter service mode.
• Hum bars, especially on yellow or orange background.
• No vertical deflection. Only a horizontal bright line appears on CRT. Audio OK. (extract of circuit diagram attached)
• Goes into safety mode at switch on. If FBT is unsoldered then HT is re-established. No apparent S/C in secondary of FBT. (part of circuit diagram displayed)
• NICAM is missing.
• Too wide picture and East/West pincushion curving outward. (picture attached)
• Noise in audio. (+ extract of circuit diagram)
• Dark picture. Stripes after a while. OK after warm-up. (extract of circuit diagram attached)
• Picture is out of alignment horizontally. 10cm black bar on the right. (with circuit diagram extract)
• Control unit processor is defective. (+ extract of circuit diagram)
• Poor synchronisation. No picture. after a while.
• Line foldover by start-up. No sound. After warm-up, picture and sound are OK. Sync is still unstable.
• Only blue light at right in picture.
• High voltage transistor (S2000) defective. (picture attached)
• Remains in standby after changing power IC. (picture attached)
• After transporting an appliance, the first time it starts up there may be distorted playback of colour (flickering, drop out or stripes) and/or defective teletext playback.
• Vertical curtain-like stripes which may be distributed over the entire screen. (with circuit diagram extract)
• Strong blue dominance at top of picture. Rest of picture (approx half) ok. (part of circuit diagram displayed)
• Excessive brightness. Flyback lines. (+ extract of circuit diagram)
• Blank raster. (21D81 tip from INTERFUNK)
• Time constant switching over only occurs on memory sites 37 to 39 and AV.
• Vertical or horizontal picture shaking both when hot and cold. (+ extract of circuit diagram)
• No picture content. Picture is greyish. (extract of circuit diagram attached)
• Lines in picture.
• After the appliance is switched off a large spot of light appears for several seconds in the middle of the screen. (+ extract of circuit diagram)
• Black vertical bars on picture, mostly visible in AV with no video source. (with circuit diagram extract)
• Impossible to adjust the horizontal synchronization. Picture has shifted 10cm to the left. TDA 8372A on pin 20 has already been replaced, sandcastle incorrect. Power supply is good. (picture attached)
• Horizontal line.
• Only standby LED lit. LED switches off at switch on then no function.
• Line BU is abnormally hot.
• Unclear picture with Hum content.
• Switches off when selecting a function via RC.
• PSU switches from standby to safety mode at switch on.
• No E/W correction. (picture attached)
• Dark picture on 2/3 of screen on the left but brighter on 1/3 of screen on the right. (with circuit diagram extract)
• Vertical hum bars on picture, sometimes very visible and sometimes hardly at all.
• Horizontal jitter. when cold. (21D81 tip from INTERFUNK)
• No horizontal synchronisation. at start-up. (with circuit diagram extract)
• Excessive brightness. in the centre. (+ extract of circuit diagram)
• Programmes change by themselves. RC is OK.
• Horizontal collapse. after a while. (+ extract of circuit diagram)
• T501 fails repeatedly.
• Picture goes off after 1 minute; very low contrast, ok through scart. (extract of circuit diagram attached)
• No tuning.
• If switched to standby, appliance pulsates and can be heard in loudspeakers. (extract of circuit diagram attached)
• Few segments of the display too bright. Doesn't respond to commands.
• HV appears briefly and then disappears. (+ extract of circuit diagram)
• Dark picture. intermittently.
• Occasionally blue screen. Picture ok when G2 adjusted then disappears again. When pressed too much picture remains incorrect then disappears.
• Intermittently line transistor defective at start up. Fault also occurs intermittently in channel search or when switching to another channel. Once appliance runs, it runs well.
• Picture and sound missing. Via scart socket with video recorder OK (picture attached)
• Black screen. Display flashes once at switch on.
• Pulsating picture. (extract of circuit diagram attached)
• Horizontal shaking. when cold.
• Picture shifted to the left. (extract of circuit diagram attached)
• Starts with noise (approx. 2-3 seconds), then it operates normally. (part of circuit diagram displayed) (INTERFUNK - 21D81 information)
• Shuts down. (with circuit diagram extract)
• Grey picture at switch on and sound which disappears after 15 mins. Grey screen with frizzy line on the sides when pressing G2.
• Motorboating noise at switch on. When you change IC701 the TV starts up again, it is possible to switch it off and to start it up by using standby. Otherwise, the fault starts again. (extract of circuit diagram attached)
• Switches off immediately after plugging in mains. (+ extract of circuit diagram) (21D81 INTERFUNK repair tip)
• Programming menu can not be accessed. (picture attached)
• No picture. No audio. (extract of circuit diagram attached)
• Picture tearing.
• No vertical deflection. Horizontal line. Audio OK . (+ extract of circuit diagram) (INTERFUNK - 21D81 information)
• Reduced vertical size.
• LED lights up briefly then nothing more.
• Loud noise. at start-up.
• PSU cannot be started from Stand By. 145V voltage in an unloaded condition is at approx 105V, the connected lamp does not light up, the voltage then collapses to approx 20V. (part of circuit diagram displayed)
• Switches on for a short time with RC, then switches off. "I" and "II" flicker on display. LED doesn't light. Starts up again with RC, if previously disconnected from mains.
• In a grey area - independent of colour saturation - you can see 2 vertical zones approx 15cm wide, greeny blue in colour with coloured edges.
• Picture is distorted and changes. Loss of colours. (with circuit diagram extract)
• White screen, horizontal lines without video signal. OK on scart output T971 OK IC950 OK. No beam limiter on 15 of IC950. Flash on the screen when changing channels.
• Vertical IC (TDA3654) becomes hot, then fails after several hours. Picture OK. (extract of circuit diagram attached)
• Standby display lights up for a short time. Line output stage attempts to function, but switches off immediately.
• Especially when cold some channels are not in the French standard. They remain in FM sound and inverted video. When warm and when changing programme suddenly picture and sound appear correctly. (+ extract of circuit diagram)
• Appliance whistles. Sound and picture present. Picture interference (lines approx one centimeter apart over the whole of the picture).
• Vertical collapse. (with circuit diagram extract)
• No functions. Red LED does not flash. (service info for INTERFUNK -21D81)
• Does not start from Standby.
• Dark picture. on the right. (part of circuit diagram displayed)
• No horizontal synchronisation. (extract of circuit diagram attached)
• White, horizontal lines at the top of the picture. Lines decrease after a while but never disappear completely.
• Erratic functions. (extract of circuit diagram attached)
• When the appliance is switched on it goes into undefined operating conditions ie. in spite of correct operating voltages the appliance has eg. no picture, no sound, no display etc. (21D81 tip from INTERFUNK)
• Slow start-up. when cold. (with circuit diagram extract)
• PSU fails intermittently. (+ extract of circuit diagram)
• Line transformer starts up with an amplitude of 400V blemished by many interference lines.
• No TXT.
• Picture takes 15 secs. to appear. Sound ok and EHT present.
• At start up the power supply starts up for 2 secs then the appliance apparently goes into safety mode. No fault on the secondary. (21D81 tips)
• White point when switching off with ON/OFF switch. No point in standby.
• Approx 20cm wide dark area in centre of picture and line tearing.
• AV correction.
• Switches off completely after switch on. No standby function. (with circuit diagram extract)
• No functions. after a while.
• Blank screen with purple haze at left hand side. (with circuit diagram extract)
• Operation commands are not carried out.
• Switches to standby (intermittently).
• Switches to protection mode. at start-up. (part of circuit diagram displayed)
• Vertical, bright stripe faintly visible in the right third of the picture.
• At switch on, functions but with no picture. By pressing the CRT module it unblocks and the picture appears. Predominant colour depends on the pressure used.
• HV builds up briefly and then shuts down
• No start-up (when cold).
• Brightness varies. E/W fault. intermittently. (INTERFUNK - 21D81 information)
• When appliance receives in Nicam stereo, the TV goes into PAL.
• No synchronisation (after start-up). (picture attached)
• Blanking interval on left side of picture, colour flickers and screen dark after a while. (INTERFUNK - 21D81 information)
• Horizontal white line.
• One side of picture is black.
• Does not switch on. Fluttering noise from the loudspeakers. (extract of circuit diagram attached)
• Top third of screen has ragged vertical lines.
• Afterglow on deflection tube after switch off.
• PSU can not be loaded with 60W incandescent lamp.
• Will not select text, or will only select mix or full text but not both, various other functions faulty.
• Line tearing. (+ extract of circuit diagram) (21D81 INTERFUNK repair tip)
• HT starts up, appliance switches off immediately. Power supply with lamp OK but documentation states voltage must be 60-100V when pin 4 of line transformer disconnected and lamp connected to D765 60-100V. Voltage in this case is 145V.
• Sound cracks. Switches off. Display stays. Can be restarted with RC. (with circuit diagram extract)
• Blocked control processor.
• Poor adjustment of horizontal picture centering. (+ extract of circuit diagram)
• Excessive vertical size. Vertical foldover at bottom.
• Instructions on how to put appliance into Service-Mode.
• PSU chirps, at the same time bubbling and hum in loudspeakers. No functions. (part of circuit diagram displayed)
• Intermittent block.
• Picture shifted to the right.
• Insufficient picture heigth (10cm) and severe linear distortion.
• Very slight flickering with a light picture. (picture attached) (21D81 tips)
• Picture is too wide. E/W distorted.
• No tuning. only on certain channels. Dark screen. on the right.
• Faulty colour (green tinge, on upper picture edge, intermittently present). B/W picture OK. TXT and menu are OK too.
• At switch on, lights light up for an instant, voltage which ought to reach 145V increases to 60V but then goes back to 0V. (extract of circuit diagram attached)
• DF-AF adjustment.
• Picture amplitude is too weak.