28D81 / SCHAUBLORENZ [TV]

• Programmes change by themselves. RC is OK.
• No control and cannot be switched off when started up from standby.
• Poor line and picture synchronisation when cold.
• 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.
• Only standby LED lit. LED switches off at switch on then no function. (28D81 SCHAUBLORENZ repair tip)
• Picture shifted to the left. Alignment works normally. (picture attached)
• Horizontal synchronisation fault even after replacing TDA8372. Weak adjustment with pot R634. Line synchronisation OK. Comparator OK. Horizontal linearity is OK. (extract of circuit diagram attached)
• E/W fault. (picture attached)
• Excessive brightness. Flyback lines. (with circuit diagram extract)
• No vertical deflection. Horizontal line. Audio OK . (+ extract of circuit diagram) (service info for SCHAUBLORENZ -28D81)
• Halts at switch on when cold. No start up. OK after a few attempts. (with circuit diagram extract) (28D81 tips)
• Secondary voltages appear for 1 to 2 secs. then nothing else. Standby LED switches off.
• Picture only appears about 3 mins after switch on, when appliance is cold.
• At switch on picture is condensed tnen enlarged. Pops loudly at approx 2 pulses per sec. Intermittent blast from speakers. (part of circuit diagram displayed)
• E/W-fault.
• Distorted vertical linearity. Barrel distortion. (picture attached)
• No start up after changing FBT and constant whistling noise. (part of circuit diagram displayed)
• Vertical jitter. when cold.
• Vertical IC fails. (+ extract of circuit diagram) (28D81 tip from SCHAUBLORENZ)
• Stuck in standby.
• Line frequency changes downward (squeaking, whistling).
• White horizontal stripe about 5 cm from the bottom. Picture content bellow stripe is altered and noisy.
• Switches off immediately after plugging in mains. (part of circuit diagram displayed) (SCHAUBLORENZ - 28D81 information)
• No tuning.
• Picture appears slowly. (picture attached)
• No horizontal synchronisation. (with circuit diagram extract)
• Picture too big. (part of circuit diagram displayed)
• Picture takes 15 secs. to appear. Sound ok and EHT present. (service info for SCHAUBLORENZ -28D81)
• Noise in the speakers and no start up or display on the front panel when switching on. (with circuit diagram extract)
• No raster sync in HF. Ok in scart. (part of circuit diagram displayed)
• Blocked control processor.
• Power supply hiccups.
• Vertical hum bars on picture, sometimes very visible and sometimes hardly at all.
• Will not select text, or will only select mix or full text but not both, various other functions faulty.
• 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 attached)
• No TXT.
• 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.
• White screen. Flyback lines.
• No functions. Red LED does not flash.
• Picture shaking in a random direction. (extract of circuit diagram attached)
• PSU starts briefly, then no more HV. (picture attached)
• One side of picture is black. (28D81 tips)
• No audio (when cold).
• Faint and too dark picture. Low brightness, contrast cannot be adjusted. Colour is adjustable.
• High voltage transistor (S2000) defective. (with circuit diagram extract)
• Does not start from Standby.
• Hums at switch on. (part of circuit diagram displayed)
• Standby display lights up briefly, then no function.
• AV correction.
• T501 fails repeatedly.
• 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.
• Enter service mode.
• Brightness differs between left and right hand side of the screen.
• Collapses at start up, then switches off.
• Loses sync at start-up for a few minutes.
• Intermittent loss of brightness, picture is black. Can be adjusted with RC. Or vice versa, picture is too light and can be adjusted.
• Picture shifted to the left, too small and not adjustable. (+ extract of circuit diagram)
• No tuning. only on certain channels. Dark screen. on the right.
• Reduced vertical size.
• Bright vertical stripes. No picture content. Sound OK. (with circuit diagram extract)
• At start up the power supply starts up for 2 secs then the appliance apparently goes into safety mode. No fault on the secondary.
• Excessive HV. (picture attached)
• Black picture. Sound OK. Picture is OK after restart. (+ extract of circuit diagram)
• Black screen. Display flashes once at switch on.
• Distorted picture. on the right. (part of circuit diagram displayed)
• 88 shown on LED display.
• Picture distorted, shifted upwards and a little bit too wide.
• Picture shifted to the left. (picture attached)
• 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. (with circuit diagram extract)
• Line transformer starts up but no display, nothing on the screen and no sound. (extract of circuit diagram attached) (28D81 SCHAUBLORENZ repair tip)
• PSU fails intermittently. (part of circuit diagram displayed)
• Sound channel 1 and 2 voltage level adjustment. (28D81 tip from SCHAUBLORENZ)
• 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.
• No functions.
• PSU can not be loaded with 60W incandescent lamp.
• Horizontal collapse. after a while. (+ extract of circuit diagram)
• Dead. after start-up.
• High voltage runs high. Flashover all over. (service info for SCHAUBLORENZ -28D81)
• Line tearing. (picture attached)
• Power supply seems to remain in safety mode. (with circuit diagram extract)
• PSU doesn't start-up or only after a while. Cracking sound.
• 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. (+ extract of circuit diagram)
• Erratic functions. (extract of circuit diagram attached)
• Transistor T701 fails when appliance is switched off and on. (28D81 tip from SCHAUBLORENZ)
• Noise in audio. (extract of circuit diagram attached)
• EHT is heard starting up then everything stops 4 secs later. (28D81 SCHAUBLORENZ repair tip)
• Reduced contrast, especially on one side of the screen.
• Picture tearing.
• E/W trapezium does not function.
• Horizontal shaking. when cold.
• Blanking interval on left side of picture, colour flickers and screen dark after a while.
• Switches to standby when mains switch is plugged in. Switches off when using RCU. (picture attached)
• Resistor R515 becomes defective. (+ extract of circuit diagram)
• At Power On standby LED switches off immediately after switching on.
• HV appears briefly and then disappears. (with circuit diagram extract)
• Focus problem. Blurred vertically, ok horizontally after replacing microprocessor and line transformer.
• No colour.
• PSU pulsates. Sound crackles. After few secs. appliance works fine. (28D81 SCHAUBLORENZ repair tip)
• Convex picture. Defective lower linearity. (extract of circuit diagram attached)
• Cuts out after switch on, soft hum from the speakers in standby mode. (28D81 tips)
• Horizontal jitter. when cold.
• Cycles on/off.
• Unstable picture. (picture attached)
• Blank screen with purple haze at left hand side. (extract of circuit diagram attached)
• Picture shifted horizontally. (picture attached)
• Picture and sound missing. Via scart socket with video recorder OK (with circuit diagram extract)
• Does not switch ON. No power light showing.
• Rattling noise or bubbling at start-up (when cold). (with circuit diagram extract)
• 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.
• No start-up. (with circuit diagram extract)
• Excessive horizontal size. (picture attached) (28D81 tip from SCHAUBLORENZ)
• Lines in picture. (28D81 SCHAUBLORENZ repair tip)
• Unusual TXT.
• Double picture.
• Tripping.
• Picture goes off after 1 minute; very low contrast, ok through scart. (with circuit diagram extract)
• Blue screen. Flyback lines. Audio OK .
• Poor synchronisation. No picture. after a while.
• Flashing picture. (part of circuit diagram displayed)
• Blank raster.
• PSU switches from standby to safety mode at switch on. (28D81 tip from SCHAUBLORENZ)
• No picture. Audio OK . (extract of circuit diagram attached) (28D81 tip from SCHAUBLORENZ)
• Goes into safety mode at switch on. If FBT is unsoldered then HT is re-established. No apparent S/C in secondary of FBT. (extract of circuit diagram attached)
• From a cold start line output stage transistor fails.
• At switch on appliance pulsated then reverts to standby again.
• No synchronisation (after start-up). (with circuit diagram extract)
• Black bars on the bottom of picture. If V-amplitude is altered, picture disappears on the bottom. (extract of circuit diagram attached)
• Slow start-up. when cold. (+ extract of circuit diagram)
• Does not go into text mode, mix mode is not possible.
• Brightness varies. E/W fault. intermittently.
• No start-up from standby.
• Black vertical bars on picture, mostly visible in AV with no video source. (extract of circuit diagram attached)
• When TV started up, transistor (S2000AF) instantly burn out. (+ extract of circuit diagram)
• Top third of screen has ragged vertical lines.
• No HT output from power supply. OK in standby. (with circuit diagram extract)
• No vertical deflection. intermittently.
• Line BU voltage = 140V. Value of capacitor C701 (in PSU) illegible. Still no display if line BU disconnected. (with circuit diagram extract)
• Programming menu can not be accessed. (picture attached) (28D81 tip from SCHAUBLORENZ)
• Goes into PAL reception when in NICAM reception on channel 64, programme N1.
• Horizontal picture position is incorrect, 5cm to the left. No picture intermittently. (part of circuit diagram displayed) (service info for SCHAUBLORENZ -28D81)
• Long picture at start up, black screen with rainbow spots.
• Horizontal synchronisation fault, picture shifted towards left side. (part of circuit diagram displayed)
• Switches off when selecting a function via RC.
• At switch on, lights light up for an instant, voltage which ought to reach 145V increases to 60V but then goes back to 0V. (with circuit diagram extract)
• No horizontal synchronisation. at start-up. (part of circuit diagram displayed) (28D81 SCHAUBLORENZ repair tip)
• 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. (picture attached)
• Centre of snowy picture is darker than edges. (extract of circuit diagram attached)
• Very pale picture which is shifted to the left. Voltage is correct. (extract of circuit diagram attached)
• The teletext contrast is considerably too high after installing the teletext decoder.
• Ok with signal. Without signal: unstable line frequency, line stage transformer makes a loud whistling noise and T511 (scanning transistor) shorts. (picture attached)
• No picture content. Picture is greyish. (part of circuit diagram displayed)
• Very slight flickering with a light picture. (picture attached)
• Motorboating noise at switch on. Pin 13 of the TDA8372A is unsoldered. TV no longer pulsates. Power supply voltages ok. (with circuit diagram extract)
• At the top edge of the picture an unusual stain effect appears and line tearing.
• Does not switch on. Fluttering noise from the loudspeakers. (part of circuit diagram displayed)
• Dark picture. Stripes after a while. OK after warm-up. (extract of circuit diagram attached)
• No tuning. Higher channels in band I/III/V are not received.
• Picture is distorted and changes. Loss of colours. (picture attached)
• Pincushion distortion.
• Wavy picture. at top. (+ extract of circuit diagram)
• When appliance receives in Nicam stereo, the TV goes into PAL.
• In a grey area - independent of colour saturation - you can see 2 vertical zones approx 15cm wide, greeny blue in colour with coloured edges.
• Excessive brightness. in the centre. (+ extract of circuit diagram) (SCHAUBLORENZ - 28D81 information)
• No E/W correction. (part of circuit diagram displayed)
• No picture. on lower half screen. (part of circuit diagram displayed)
• Automatic B/G-L detection does not work correctly with the Nicam sound carrier (TF1, FRANCE 2).
• Does not start up each time. When it functions, whistling and modulation of picture. This gets less in time.
• No synchronisation during the first few mins. (part of circuit diagram displayed)
• No functions. after a while.
• Vertical IC (TDA3654) becomes hot, then fails after several hours. Picture OK. (extract of circuit diagram attached) (28D81 tip from SCHAUBLORENZ)
• No picture. No audio. (extract of circuit diagram attached)
• Dead.
• Dark picture on 2/3 of screen on the left but brighter on 1/3 of screen on the right. (extract of circuit diagram attached)
• Low brightness. Picture too big.
• Channel TF1 (channel 22) does not hold in SECAM: remains in PAL. The other channels are normal.
• Hum bars, especially on yellow or orange background.
• Control unit processor is defective. (extract of circuit diagram attached)
• Coloured lines (RGB test lines) in top of picture.
• Poor audio.
• Hums at switch on, dies out slowly.
• Starts with noise (approx. 2-3 seconds), then it operates normally. (picture attached) (28D81 tips)
• Horizontal line.
• Picture amplitude is too weak.
• Bright picture. on the right. Dark picture. on the left. (picture attached)
• Picture shifted to the right.
• Sound cracks. Switches off. Display stays. Can be restarted with RC. (+ extract of circuit diagram)
• Switches to protection mode. at start-up. (extract of circuit diagram attached)
• Only blue light at right in picture.
• Standby display lights up for a short time. Line output stage attempts to function, but switches off immediately. (28D81 SCHAUBLORENZ repair tip)
• Unstable horizontal picture.
• Whistling HT. No start up due to incorrect HT frequency. May blow S2000 immediately. (extract of circuit diagram attached)
• High voltage build up for short time then PSU switches off. (extract of circuit diagram attached)
• No TXT (intermittently).
• Can be switched to standby only if power plug is pulled out.
• Vertical or horizontal picture shaking both when hot and cold. (part of circuit diagram displayed)
• Shuts down. (extract of circuit diagram attached) (28D81 SCHAUBLORENZ repair tip)
• Does not fully go to TXT or only blue mix TXT. (picture attached)
• Instructions on how to put appliance into Service-Mode.
• Grey picture at switch on and sound which disappears after 15 mins. Grey screen with frizzy line on the sides when pressing G2.
• NICAM check.
• HV arcing. (part of circuit diagram displayed)
• Slightly wavy picture in the middle of the screen. (picture attached)
• Unclear picture with Hum content. (28D81 tip from SCHAUBLORENZ)
• Picture shifted to the left. Sometimes picture fails completely, then still only picture blanking stripes visible. (extract of circuit diagram attached) (28D81 tip from SCHAUBLORENZ)
• Defective linearity.
• Vertical dark bands running from left to centre of picture and separated by approx. 5cm.
• HV builds up briefly and then shuts down
• Left picture side is brighter, even via AV. (extract of circuit diagram attached)
• Vertical lines. No colour. after a while.
• Approx. 1cm bright, vertical line on the right hand side of the picture approx. 10cm from the edge. (SCHAUBLORENZ - 28D81 information)
• 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.
• Operation commands are not carried out.
• White, horizontal lines at the top of the picture. Lines decrease after a while but never disappear completely.
• Dark screen, only diffuse glow.
• Random operation commands.
• Horizontal white line.
• Vertical collapse. (picture attached)
• PSU is defective. 300V is present.
• No HV.
• Picture rolls. when cold. (extract of circuit diagram attached)
• Intermittent block.
• Line BU is abnormally hot.
• Afterglow on deflection tube after switch off.
• Picture with vertical and horizontal lines (when cold).
• 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. (part of circuit diagram displayed)
• Picture is out of alignment horizontally. 10cm black bar on the right. (part of circuit diagram displayed)
• PSU doesn't start up when cold. (part of circuit diagram displayed)
• Remains in standby after changing power IC. (picture attached)
• At switch ON, set screams. Pressing on the on/off switch gives same condition. Standby LED's off.
• The picture is too large and wavers.
• Stops after 5 seconds. No standby LED. (part of circuit diagram displayed)
• Appliance whistles. Sound and picture present. Picture interference (lines approx one centimeter apart over the whole of the picture).
• Poor PSU start-up or BU defective. (with circuit diagram extract)
• Loud noise. at start-up.
• 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.
• Resistor R775 is defective.
• Poor vertical linearity at the bottom, also E/W error.
• Dark picture. intermittently.
• FBT blows after a few mins. (picture attached)
• Insufficient picture heigth (10cm) and severe linear distortion.
• Pulsating picture. (+ extract of circuit diagram)
• If switched to standby, appliance pulsates and can be heard in loudspeakers. (picture attached)
• 10cm black bar on the right of the screen. Voltages ok, corrections work. (with circuit diagram extract)
• Vertical, bright stripe faintly visible in the right third of the picture.
• White point when switching off with ON/OFF switch. No point in standby.
• Occasionally blue screen. Picture ok when G2 adjusted then disappears again. When pressed too much picture remains incorrect then disappears.
• No PSU start-up.
• Horizontal jitter. Vertical jitter. (picture attached)
• Vertical line tearing. intermittently.
• 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)
• Poor shading of picture, dark on one side and light on the other. (with circuit diagram extract)
• 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 attached)
• LED lights up briefly then nothing more.
• Builds up high voltage for a short time and then switches off. (with circuit diagram extract)
• Dark picture.
• Line foldover by start-up. No sound. After warm-up, picture and sound are OK. Sync is still unstable.
• Switches off completely after switch on. No standby function. (with circuit diagram extract)
• Eliminate safety mode of PSU.
• Line tearing. at top. (picture attached)
• Vertical curtain-like stripes which may be distributed over the entire screen. (+ extract of circuit diagram)
• Wavy vertical lines in the entire picture when cold. Picture jitters. (part of circuit diagram displayed)
• Output transistor (S2000) fails when started from cold.
• Intermittent no image or yellow colouring. Knock sensitive. (picture attached)
• Few segments of the display too bright. Doesn't respond to commands.
• Picture has moved approx 10cm to the left. Vertical black bar with a few coloured streaks. Colour OK. (+ extract of circuit diagram)
• Vertical and horizontal synchronisation available only after 2 mins. (28D81 tips)
• No colour (intermittently).
• Power supply defective after a few days. (with circuit diagram extract)
• Comes on for a short time. (picture attached)
• Dark picture. on the right. (picture attached) (28D81 tips)
• No picture. Hum in audio.
• Switches to standby (intermittently).
• Faulty colour (green tinge, on upper picture edge, intermittently present). B/W picture OK. TXT and menu are OK too.
• Excessive vertical size. Vertical foldover at bottom.
• PSU chirps, at the same time bubbling and hum in loudspeakers. No functions. (extract of circuit diagram attached)
• Only snow in the picture, after changing the tuner the fault is still there.
• Picture with a 10cm vertical band on the right side. Negative picture behind this black band.
• Line output stage fails at switch on. With load (lamp) appliance can be switched on with squeaking noise. (picture attached)
• Line transformer starts up with an amplitude of 400V blemished by many interference lines.
• 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.
• Noise in picture. Poor horizontal synchronisation.
• Intermittently line tearing in the middle (approx. 20cm wide). (with circuit diagram extract)
• Approx 20cm wide dark area in centre of picture and line tearing.
• No vertical deflection. Only a horizontal bright line appears on CRT. Audio OK. (part of circuit diagram displayed)
• Strong blue dominance at top of picture. Rest of picture (approx half) ok. (extract of circuit diagram attached)
• Motorboating noise at switch on then goes into standby. When frame IC is unsoldered TV starts up. (extract of circuit diagram attached)
• Dark screen. on the right. (with circuit diagram extract)
• Picture collapse on half of the picture.
• Whenever a function is requested display lights up then switches off.
• Line transistor S2000AF defective at switch on from cold. (with circuit diagram extract)
• Display flashing and rattles at switch on. (extract of circuit diagram attached)
• Poor adjustment of horizontal picture centering. (picture attached) (28D81 tips)
• Horizontal stripe. in the centre.
• Impossible to adjust synchronisation. Picture shifted towards left. Right side of picture reduced by 8cm. (picture attached)
• Blue, vertical stripe in the right third of the picture.
• Stuck in standby; RC ineffective. Stanby LED flickers. (part of circuit diagram displayed)
• Buzzing at start-up.
• No picture (intermittently).
• No start up after changing IC601. Nothing lights up on the front.
• Reduced raster size. (picture attached)
• 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)
• Attempts to start with no result. (picture attached)
• No start-up (when cold).
• Does not switch to standby. (part of circuit diagram displayed)
• No horizontal or vertical deflection.
• 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.
• Intermittent flyback lines. Grey scale varies intermittently. Possibly no picture. (28D81 SCHAUBLORENZ repair tip)
• Does not go into TXT mode. Mixed mode possible.
• Poor PSU start up. Severe crackle in the loudspeaker. (service info for SCHAUBLORENZ -28D81)
• Bright raster. Flyback lines.
• Text selection is not possible, takes only Mix or full text but not both. Also various other functions are defective.
• After approx 20 mins colour TV switches off.
• Shadowing effect, left side of picture is brighter than the right one. (with circuit diagram extract)
• Shuts down. after start-up. (part of circuit diagram displayed)
• 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.
• Line synchronisation available only after 2 mins.
• NICAM is missing.
• Control unit does not function. Does not switch on. (picture attached)
• Intermittently dead. (+ extract of circuit diagram) (service info for SCHAUBLORENZ -28D81)
• Picture is brighter on the right. Poor synchronisation after program switch-over. Picture becomes brighter and darker in AV. (part of circuit diagram displayed)
• Black bar on the right side of the screen. Similar to displacement. (+ extract of circuit diagram)
• Picture is too wide. E/W distorted. (28D81 tip from SCHAUBLORENZ)
• Illegible display. (+ extract of circuit diagram)
• No start up, no standby light, variable voltage on pin 16 of IC701. (with circuit diagram extract)
• Too wide picture and East/West pincushion curving outward. (+ extract of circuit diagram) (28D81 SCHAUBLORENZ repair tip)
• DF-AF adjustment.
• Time constant switching over only occurs on memory sites 37 to 39 and AV.