850 / DUKANE [Projectors]

• Vertical or horizontal picture shaking both when hot and cold. (picture attached)
• No vertical deflection. Horizontal line. Audio OK . (with circuit diagram extract)
• Unstable horizontal picture.
• No horizontal synchronisation. (+ extract of circuit diagram)
• From a cold start line output stage transistor fails.
• Blocked control processor.
• Line synchronisation available only after 2 mins.
• Rattling noise or bubbling at start-up (when cold). (picture attached)
• White, horizontal lines at the top of the picture. Lines decrease after a while but never disappear completely.
• Line tearing. at top. (part of circuit diagram displayed)
• In a grey area - independent of colour saturation - you can see 2 vertical zones approx 15cm wide, greeny blue in colour with coloured edges.
• Control unit processor is defective. (extract of circuit diagram attached)
• Loses sync at start-up for a few minutes.
• Reduced contrast, especially on one side of the screen.
• Standby display lights up for a short time. Line output stage attempts to function, but switches off immediately.
• Vertical lines. No colour. after a while.
• Dark picture. on the right. (picture attached)
• Hums at switch on, dies out slowly.
• No picture content. Picture is greyish. (picture attached)
• Blank screen with purple haze at left hand side. (part of circuit diagram displayed)
• No TXT.
• Vertical dark bands running from left to centre of picture and separated by approx. 5cm.
• Comes on for a short time. (extract of circuit diagram attached)
• Enter service mode.
• The teletext contrast is considerably too high after installing the teletext decoder.
• No TXT (intermittently).
• Unstable picture. (picture attached)
• Impossible to adjust synchronisation. Picture shifted towards left. Right side of picture reduced by 8cm. (with circuit diagram extract)
• No picture. No audio. (+ extract of circuit diagram)
• Vertical, bright stripe faintly visible in the right third of the picture.
• No tuning.
• Line frequency changes downward (squeaking, whistling).
• Power supply hiccups.
• Dark screen. on the right. (with circuit diagram extract)
• Resistor R775 is defective.
• Switches off completely after switch on. No standby function. (+ extract of circuit diagram)
• DF-AF adjustment.
• Picture takes 15 secs. to appear. Sound ok and EHT present.
• No start up after changing IC601. Nothing lights up on the front. (850 tips)
• Output transistor (S2000) fails when started from cold. (850 tip from DUKANE)
• Picture rolls. when cold. (extract of circuit diagram attached)
• No start-up. (+ extract of circuit diagram)
• High voltage runs high. Flashover all over.
• PSU is defective. 300V is present.
• At switch on picture is condensed tnen enlarged. Pops loudly at approx 2 pulses per sec. Intermittent blast from speakers. (+ extract of circuit diagram)
• No horizontal or vertical deflection.
• Intermittently dead. (+ extract of circuit diagram) (850 DUKANE repair tip)
• Switches off immediately after plugging in mains. (+ extract of circuit diagram)
• 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.
• Poor vertical linearity at the bottom, also E/W error. (850 tips)
• 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.
• Line tearing. (picture attached)
• White screen. Flyback lines.
• Picture distorted, shifted upwards and a little bit too wide.
• Slightly wavy picture in the middle of the screen. (+ extract of circuit diagram)
• Black bar on the right side of the screen. Similar to displacement. (with circuit diagram extract)
• Picture shaking in a random direction. (part of circuit diagram displayed)
• Ok with signal. Without signal: unstable line frequency, line stage transformer makes a loud whistling noise and T511 (scanning transistor) shorts. (picture 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. (with circuit diagram extract)
• White horizontal stripe about 5 cm from the bottom. Picture content bellow stripe is altered and noisy.
• Line BU is abnormally hot.
• No E/W correction. (extract of circuit diagram attached)
• Shuts down. after start-up. (part of circuit diagram displayed) (service info for DUKANE -850)
• 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. (picture attached) (850 DUKANE repair tip)
• Erratic functions. (extract of circuit diagram attached)
• If switched to standby, appliance pulsates and can be heard in loudspeakers. (part of circuit diagram displayed)
• Excessive brightness. in the centre. (+ extract of circuit diagram)
• Automatic B/G-L detection does not work correctly with the Nicam sound carrier (TF1, FRANCE 2).
• Hums at switch on. (+ extract of circuit diagram)
• Horizontal shaking. when cold. (850 DUKANE repair tip)
• High voltage transistor (S2000) defective. (extract of circuit diagram attached)
• Line transistor S2000AF defective at switch on from cold. (with circuit diagram extract)
• Excessive HV. (extract of circuit diagram attached)
• Noise in audio. (extract of circuit diagram attached)
• 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.
• Picture is too wide. E/W distorted.
• No HV.
• Dark picture on 2/3 of screen on the left but brighter on 1/3 of screen on the right. (picture attached)
• No colour (intermittently).
• Only snow in the picture, after changing the tuner the fault is still there.
• 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.
• Cycles on/off.
• Goes into PAL reception when in NICAM reception on channel 64, programme N1.
• Intermittent block.
• Power supply seems to remain in safety mode. (picture attached)
• Very pale picture which is shifted to the left. Voltage is correct. (+ extract of circuit diagram)
• No start up, no standby light, variable voltage on pin 16 of IC701. (extract of circuit diagram attached)
• PSU starts briefly, then no more HV. (extract of circuit diagram attached)
• 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. (picture attached)
• Can be switched to standby only if power plug is pulled out.
• Vertical curtain-like stripes which may be distributed over the entire screen. (picture attached)
• No vertical deflection. Only a horizontal bright line appears on CRT. Audio OK. (with circuit diagram extract)
• PSU can not be loaded with 60W incandescent lamp.
• PSU doesn't start up when cold. (+ extract of circuit diagram)
• No PSU start-up.
• Programmes change by themselves. RC is OK.
• Line transformer starts up but no display, nothing on the screen and no sound. (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.
• Brightness differs between left and right hand side of the screen.
• Blue, vertical stripe in the right third of the picture.
• Afterglow on deflection tube after switch off.
• Distorted vertical linearity. Barrel distortion. (extract of circuit diagram attached)
• Noise in the speakers and no start up or display on the front panel when switching on. (picture attached)
• Switches to standby when mains switch is plugged in. Switches off when using RCU. (+ extract of circuit diagram)
• Picture shifted to the left. Sometimes picture fails completely, then still only picture blanking stripes visible. (with circuit diagram extract)
• No functions. after a while.
• Double picture.
• 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. (with circuit diagram extract)
• No tuning. only on certain channels. Dark screen. on the right.
• Intermittently line tearing in the middle (approx. 20cm wide). (picture attached)
• Picture with a 10cm vertical band on the right side. Negative picture behind this black band.
• Pulsating picture. (picture attached)
• Secondary voltages appear for 1 to 2 secs. then nothing else. Standby LED switches off. (850 DUKANE repair tip)
• Excessive brightness. Flyback lines. (+ extract of circuit diagram)
• At switch ON, set screams. Pressing on the on/off switch gives same condition. Standby LED's off.
• Picture is out of alignment horizontally. 10cm black bar on the right. (extract of circuit diagram attached)
• No synchronisation during the first few mins. (extract of circuit diagram attached)
• Loud noise. at start-up.
• FBT blows after a few mins. (+ extract of circuit diagram)
• Black picture. Sound OK. Picture is OK after restart. (extract of circuit diagram attached) (850 tips)
• Faulty colour (green tinge, on upper picture edge, intermittently present). B/W picture OK. TXT and menu are OK too.
• Horizontal picture position is incorrect, 5cm to the left. No picture intermittently. (+ extract of circuit diagram)
• High voltage build up for short time then PSU switches off. (with circuit diagram extract)
• Switches to protection mode. at start-up. (+ extract of circuit diagram) (DUKANE - 850 information)
• Excessive vertical size. Vertical foldover at bottom.
• Slow start-up. when cold. (with circuit diagram extract)
• Stuck in standby.
• Unusual TXT.
• Vertical line tearing. intermittently.
• Dead. (850 DUKANE repair tip)
• Defective linearity.
• Shadowing effect, left side of picture is brighter than the right one. (extract of circuit diagram attached) (850 DUKANE repair tip)
• At switch on appliance pulsated then reverts to standby again.
• No colour.
• One side of picture is black. (DUKANE - 850 information)
• Approx. 1cm bright, vertical line on the right hand side of the picture approx. 10cm from the edge.
• Whistling HT. No start up due to incorrect HT frequency. May blow S2000 immediately. (picture attached)
• Left picture side is brighter, even via AV. (with circuit diagram extract)
• Sound channel 1 and 2 voltage level adjustment.
• HV builds up briefly and then shuts down
• Centre of snowy picture is darker than edges. (extract of circuit diagram attached)
• Picture too big. (extract of circuit diagram attached)
• Line output stage fails at switch on. With load (lamp) appliance can be switched on with squeaking noise. (extract of circuit diagram attached)
• White point when switching off with ON/OFF switch. No point in standby.
• Tripping.
• Focus problem. Blurred vertically, ok horizontally after replacing microprocessor and line transformer.
• Picture has moved approx 10cm to the left. Vertical black bar with a few coloured streaks. Colour OK. (with circuit diagram extract)
• PSU pulsates. Sound crackles. After few secs. appliance works fine.
• No picture. Audio OK . (extract of circuit diagram attached)
• Remains in standby after changing power IC. (part of circuit diagram displayed)
• Buzzing at start-up.
• Picture with vertical and horizontal lines (when cold).
• Low brightness. Picture too big.
• Unclear picture with Hum content.
• Poor shading of picture, dark on one side and light on the other. (part of circuit diagram displayed)
• Picture shifted to the left. (extract of circuit diagram attached)
• After the appliance is switched off a large spot of light appears for several seconds in the middle of the screen. (with circuit diagram extract) (850 tip from DUKANE)
• 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.
• Horizontal jitter. when cold.
• Horizontal jitter. Vertical jitter. (extract of circuit diagram attached)
• 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.
• No audio (when cold).
• When TV started up, transistor (S2000AF) instantly burn out. (part of circuit diagram displayed)
• Switches off when selecting a function via RC.
• Programming menu can not be accessed. (part of circuit diagram displayed) (850 DUKANE repair tip)
• Dark screen, only diffuse glow.
• Picture shifted to the left. Alignment works normally. (part of circuit diagram displayed)
• No picture. on lower half screen. (+ extract of circuit diagram)
• Does not go into TXT mode. Mixed mode possible.
• E/W-fault. (850 tips)
• Starts with noise (approx. 2-3 seconds), then it operates normally. (part of circuit diagram displayed) (DUKANE - 850 information)
• Stuck in standby; RC ineffective. Stanby LED flickers. (with circuit diagram extract)
• Black screen. Display flashes once at switch on.
• 88 shown on LED display.
• No start up after changing FBT and constant whistling noise. (part of circuit diagram displayed)
• Lines in picture.
• At the top edge of the picture an unusual stain effect appears and line tearing.
• Noise in picture. Poor horizontal synchronisation.
• HV appears briefly and then disappears. (extract of circuit diagram attached)
• Line BU voltage = 140V. Value of capacitor C701 (in PSU) illegible. Still no display if line BU disconnected. (with circuit diagram extract)
• Does not go into text mode, mix mode is not possible.
• NICAM is missing.
• Horizontal synchronisation fault, picture shifted towards left side. (+ extract of circuit diagram)
• Halts at switch on when cold. No start up. OK after a few attempts. (+ extract of circuit diagram)
• Blank raster.
• Power supply defective after a few days. (+ extract of circuit diagram)
• Operation commands are not carried out.
• Reduced raster size. (part of circuit diagram displayed)
• AV correction.
• Horizontal collapse. after a while. (+ extract of circuit diagram) (850 tips)
• Poor PSU start up. Severe crackle in the loudspeaker.
• Very slight flickering with a light picture. (+ extract of circuit diagram)
• 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. (with circuit diagram extract) (850 tip from DUKANE)
• 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)
• No synchronisation (after start-up). (extract of circuit diagram attached)
• Picture shifted to the right.
• No start-up from standby.
• Approx 20cm wide dark area in centre of picture and line tearing.
• 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.
• Picture shifted horizontally. (+ extract of circuit diagram)
• Poor line and picture synchronisation when cold.
• Eliminate safety mode of PSU.
• 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.
• Does not start up each time. When it functions, whistling and modulation of picture. This gets less in time. (service info for DUKANE -850)
• Poor audio.
• Hum bars, especially on yellow or orange background.
• HV arcing. (extract of circuit diagram attached)
• Does not start from Standby.
• Faint and too dark picture. Low brightness, contrast cannot be adjusted. Colour is adjustable.
• Intermittent no image or yellow colouring. Knock sensitive. (picture attached) (850 DUKANE repair tip)
• Switches to standby (intermittently). (850 tips)
• Picture appears slowly. (+ extract of circuit diagram)
• Text selection is not possible, takes only Mix or full text but not both. Also various other functions are defective.
• Vertical and horizontal synchronisation available only after 2 mins.
• Vertical collapse. (with circuit diagram extract)
• Time constant switching over only occurs on memory sites 37 to 39 and AV.
• PSU doesn't start-up or only after a while. Cracking sound.
• Few segments of the display too bright. Doesn't respond to commands.
• Picture shifted to the left, too small and not adjustable. (picture attached)
• Builds up high voltage for a short time and then switches off. (picture attached)
• Only blue light at right in picture.
• Channel TF1 (channel 22) does not hold in SECAM: remains in PAL. The other channels are normal.
• Insufficient picture heigth (10cm) and severe linear distortion. (850 tips)
• Sound cracks. Switches off. Display stays. Can be restarted with RC. (part of circuit diagram displayed)
• Display flashing and rattles at switch on. (+ extract of circuit diagram)
• Picture only appears about 3 mins after switch on, when appliance is cold.
• Illegible display. (extract of circuit diagram attached)
• 10cm black bar on the right of the screen. Voltages ok, corrections work. (part of circuit diagram displayed)
• Vertical IC fails. (picture attached)
• Cuts out after switch on, soft hum from the speakers in standby mode.
• Occasionally blue screen. Picture ok when G2 adjusted then disappears again. When pressed too much picture remains incorrect then disappears.
• Poor adjustment of horizontal picture centering. (+ extract of circuit diagram)
• Line foldover by start-up. No sound. After warm-up, picture and sound are OK. Sync is still unstable.
• PSU fails intermittently. (with circuit diagram extract)
• Black vertical bars on picture, mostly visible in AV with no video source. (extract of circuit diagram attached)
• Vertical IC (TDA3654) becomes hot, then fails after several hours. Picture OK. (picture attached)
• 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. (picture attached)
• Does not switch to standby. (+ extract of circuit diagram)
• 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) (850 tip from DUKANE)
• Dark picture.
• Picture is brighter on the right. Poor synchronisation after program switch-over. Picture becomes brighter and darker in AV. (extract of circuit diagram attached)
• EHT is heard starting up then everything stops 4 secs later.
• Convex picture. Defective lower linearity. (+ extract of circuit diagram) (850 tip from DUKANE)
• Reduced vertical size.
• Picture goes off after 1 minute; very low contrast, ok through scart. (with circuit diagram extract)
• T501 fails repeatedly.
• Transistor T701 fails when appliance is switched off and on.
• Wavy vertical lines in the entire picture when cold. Picture jitters. (extract of circuit diagram attached)
• PSU chirps, at the same time bubbling and hum in loudspeakers. No functions. (part of circuit diagram displayed)
• Motorboating noise at switch on then goes into standby. When frame IC is unsoldered TV starts up. (picture attached)
• Vertical jitter. when cold.
• Instructions on how to put appliance into Service-Mode.
• Dark picture. Stripes after a while. OK after warm-up. (with circuit diagram extract)
• No control and cannot be switched off when started up from standby. (DUKANE - 850 information)
• Brightness varies. E/W fault. intermittently.
• Resistor R515 becomes defective. (with circuit diagram extract)
• Only standby LED lit. LED switches off at switch on then no function. (850 DUKANE repair tip)
• Control unit does not function. Does not switch on. (+ extract of circuit diagram)
• Blanking interval on left side of picture, colour flickers and screen dark after a while.
• 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 functions. (service info for DUKANE -850)
• Shuts down. (extract of circuit diagram attached) (DUKANE - 850 information)
• Intermittent flyback lines. Grey scale varies intermittently. Possibly no picture.
• Whenever a function is requested display lights up then switches off.
• No horizontal synchronisation. at start-up. (part of circuit diagram displayed)
• No raster sync in HF. Ok in scart. (extract of circuit diagram attached)
• No functions. Red LED does not flash.
• When appliance receives in Nicam stereo, the TV goes into PAL.
• Strong blue dominance at top of picture. Rest of picture (approx half) ok. (part of circuit diagram displayed)
• The picture is too large and wavers.
• Standby display lights up briefly, then no function.
• At switch on, lights light up for an instant, voltage which ought to reach 145V increases to 60V but then goes back to 0V. (part of circuit diagram displayed)
• Horizontal white line.
• At start up the power supply starts up for 2 secs then the appliance apparently goes into safety mode. No fault on the secondary.
• Top third of screen has ragged vertical lines.
• PSU switches from standby to safety mode at switch on.
• Dead. after start-up.
• Intermittent loss of brightness, picture is black. Can be adjusted with RC. Or vice versa, picture is too light and can be adjusted.
• Picture and sound missing. Via scart socket with video recorder OK (extract of circuit diagram attached)
• No HT output from power supply. OK in standby. (with circuit diagram extract) (850 tip from DUKANE)
• Motorboating noise at switch on. Pin 13 of the TDA8372A is unsoldered. TV no longer pulsates. Power supply voltages ok. (picture attached)
• Will not select text, or will only select mix or full text but not both, various other functions faulty.
• Random operation commands.
• Picture is distorted and changes. Loss of colours. (picture attached)
• No picture (intermittently).
• Excessive horizontal size. (+ extract of circuit diagram)
• Horizontal stripe. in the centre. (850 DUKANE repair tip)
• Bright vertical stripes. No picture content. Sound OK. (with circuit diagram extract) (850 tips)
• Line transformer starts up with an amplitude of 400V blemished by many interference lines.
• No tuning. Higher channels in band I/III/V are not received.
• Bright raster. Flyback lines.
• Too wide picture and East/West pincushion curving outward. (part of circuit diagram displayed)
• E/W trapezium does not function.
• Stops after 5 seconds. No standby LED. (with circuit diagram extract)
• Pincushion distortion.
• No picture. Hum in audio.
• Vertical hum bars on picture, sometimes very visible and sometimes hardly at all.
• Picture collapse on half of the picture.
• LED lights up briefly then nothing more.
• Horizontal line.
• E/W fault. (+ extract of circuit diagram)
• Coloured lines (RGB test lines) in top of picture.
• Appliance whistles. Sound and picture present. Picture interference (lines approx one centimeter apart over the whole of the picture).
• Flashing picture. (+ extract of circuit diagram)
• Does not fully go to TXT or only blue mix TXT. (extract of circuit diagram attached)
• Picture tearing.
• Poor synchronisation. No picture. after a while.
• 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)
• After approx 20 mins colour TV switches off.
• Wavy picture. at top. (+ extract of circuit diagram)
• Grey picture at switch on and sound which disappears after 15 mins. Grey screen with frizzy line on the sides when pressing G2.
• Does not switch ON. No power light showing.
• Does not switch on. Fluttering noise from the loudspeakers. (picture attached)
• Poor PSU start-up or BU defective. (picture attached)
• Dark picture. intermittently. (850 tip from DUKANE)
• Bright picture. on the right. Dark picture. on the left. (extract of circuit diagram attached)
• Picture amplitude is too weak.
• NICAM check.
• Distorted picture. on the right. (+ extract of circuit diagram)
• Attempts to start with no result. (extract of circuit diagram attached)
• Collapses at start up, then switches off.
• Black bars on the bottom of picture. If V-amplitude is altered, picture disappears on the bottom. (+ extract of circuit diagram)
• No start-up (when cold).
• Long picture at start up, black screen with rainbow spots.
• No vertical deflection. intermittently.
• At Power On standby LED switches off immediately after switching on.