56KE2610 / SIERRA [TV]

• HT is low, 25V instead of 140V. (part of circuit diagram displayed) (service info for SIERRA -56KE2610)
• E/W fault. (extract of circuit diagram attached) (SIERRA - 56KE2610 information)
• Within 10 seconds the power supply only produces 80V, and is then fine. OK in when warm. (extract of circuit diagram attached)
• No synchronisation. intermittently.
• Picture is dark, sound is weak, no colour. Channels are erased.
• Unstable picture from video recorder. (extract of circuit diagram attached)
• No E/W correction.
• No brightness. No audio. (picture attached)
• Text displaced. (extract of circuit diagram attached)
• When put in standby it buzzes and won't come out.
• BUT11 fails.
• Intermittently collapses.
• Picture appears slowly. Blurry picture. Audio OK .
• Station search scan stops at a point near the station tuning point, but not at the exact tuning point.
• The appliance can no longer be operated (+ extract of circuit diagram)
• Mains fuse and transistor BUT11 fail once a week.
• Faint pattern of vertical lines approx 0.25" apart across screen and corrupt TXT intermittently.
• Uncentered picture. (picture attached)
• Excessive horizontal size. Pincushion distortion. on sides.
• Vertical output IC intermittently defective with possible patterning in picture. (SIERRA - 56KE2610 information)
• Flashing display. (picture attached)
• Poor frame amplitude with sudden frame movements.
• Bars in picture. (with circuit diagram extract)
• Faulty raster.
• Lines in picture.
• Slow start-up.
• Appliance is dead with line whistle. (56KE2610 tip from SIERRA)
• Unnatural colours.
• No picture and no sound. F3 in display. (SIERRA - 56KE2610 information)
• When set is cold, goes into standby mode but the LED flickers. When set warm it still goes into standby but won't come out. Power supply buzzes loudly and the LED's flicker rate is faster. (with circuit diagram extract)
• Vertical collapse. (+ extract of circuit diagram)
• Dark screen. (+ extract of circuit diagram)
• Line output transistor fails repeatedly. (extract of circuit diagram attached)
• Vertical output IC7570 (TDA3654Q) breaks frequently. (with circuit diagram extract) (SIERRA - 56KE2610 information)
• TV blocked. E1 on display, no volume control. Sometimes it starts up correctly for a few mins then switches back to E1. This happens with scart unplugged. (part of circuit diagram displayed)
• Switches to standby.
• Black lines on the picture -it looks as though every other line of picture content is missing.
• Tripping (intermittently). (with circuit diagram extract)
• Top of picture shifts.
• Corrections to service manual.
• During TXT, faint vertical lines and corrupt text on screen.
• To switch on "Protection Mode" flat square picture tube.
• After switching on the TV there is a loud background noise. Normal picture.
• Comes on in standby. When switching to a channel, picture and sound start up correctly but appliance switches again to standby after approx 30 secs.
• Trips. (+ extract of circuit diagram)
• Blurry picture. (picture attached)
• 140V voltage is 120V. Stand-by and EXT1 LEDs are on. (with circuit diagram extract)
• Cuts out on bright scenes.
• Cannot switch to 'Installation' menu. "DESACT" displayed.
• Unstable, rolling picture with intermittent line pairing when changing scenes. (picture attached)
• Vertical shaking. intermittently.
• Picture vertical tearing. Vertical foldover at lower part of frame.
• After flashover of picture tube, set is in protection mode. Set works again after turning on and off. (picture attached)
• Vertical foldover.
• No start-up. when cold.
• Severe patterning. (part of circuit diagram displayed)
• Power supply hiccups and LED flashes.
• Tripping. (part of circuit diagram displayed) (56KE2610 tip from SIERRA)
• Excessive horizontal size. (part of circuit diagram displayed)
• Dead, mains bridge blown up.
• Switches to standby after approx. 1min., OK again after switch on, then switches off again.
• Dead except F3 in OSD.
• Very intermittently the standby and mute LEDs flash and channel display goes off. (extract of circuit diagram attached)
• Field jitter/foldover.
• Crackling audio. intermittently. Line tearing. (with circuit diagram extract)
• Picture appears after a certain amount of time. (56KE2610 tip from SIERRA)
• Black screen. Intermittent loss of scanning raster.
• Appliance is dead, PSU whistles.
• Chopper S/C. (extract of circuit diagram attached)
• Tuning varies at a fixed rhythm as if AFC does not latch.
• When the TV is switched on it is completely dark, there is no sound and only the display circuit functions.
• No picture, no sound, LED flickers and throbs severely when appliance cold or when programme changed.
• After switching on the TV and changing channels sometimes the channels are present and sometimes they are out of tune.
• Vertical pattern over the whole screen. (picture attached)
• Converting pal/secam in the Middle East and Morocco.
• No LED lit.
• Picture too small below. The entire picture is shifted down.
• Line tearing. Poor vertical synchronisation.
• BUT11A blows intermittently.
• Faint pattern of vertical lines about a quarter of an inch apart across the screen and occasional corrupt teletext.
• Power supply collapses.
• No raster. intermittently.
• Intermittent loss of sound and vision with a buzzing noise coming from the power supply. (picture attached) (56KE2610 tip from SIERRA)
• No picture. When you switch off the appliance a horizontal line appears for a moment.
• Very defective vertical sync and occasionally also horizontal vibration.
• Channel tuning information does not store. (extract of circuit diagram attached)
• Poor E/W.
• No picture. No audio. LED blinks .
• Dull screen, no image.
• Vertical streaks. intermittently.
• Failure of IC7570 (TDA3653A "90" or TDA3654 "110") (+ extract of circuit diagram)
• Picture becomes dark. After cooling down picture is ok again.
• The field output transistor overheats and scanning is distorted after 5 minutes.
• Loss of memory when set switched off. (with circuit diagram extract)
• Flyback frame.
• Intermittent squealing from line stage at switch on.
• Thick black bar at bottom of picture. Seems like foldover.
• No start up. Noise from PSU.
• No tuning. (extract of circuit diagram attached)
• No HT recovered when H scan plug disconnected. (56KE2610 tips)
• When warm, switches off completely or hiccups in the PSU.
• No tuning. only on certain channels.
• Lines in picture. intermittently.
• RGB is not working correctly. Poor colours. (picture attached)
• White screen with black line.
• No picture. Audio OK . (+ extract of circuit diagram)
• The appliance functions intermittently, and the clock starts flashing.
• No picture. Wavy raster and display flickering. (service info for SIERRA -56KE2610)
• No tuning, no change in tuning voltage when search tuning initiated, but front display shows the correct channel number. (part of circuit diagram displayed)
• Tunes incorrectly. (part of circuit diagram displayed) (56KE2610 tips)
• Line pairing.
• Line hooking on new pre-recorded tapes with the macro vision anti copying signal. (56KE2610 tip from SIERRA)
• Replaced power regulator which cured fault. After replacing the PCB it went S/C again.
• No results but 140V and 19V primary voltages are ok. Collector of IC7535 reads 0V.
• Interference C.G. bar in picture on channel 2. (part of circuit diagram displayed)
• BUT11AF S/C. Fuse blown. (+ extract of circuit diagram)
• Width flutter.
• Some channels alternate between good picture and snow. OK on scart input.
• No green.
• Moire pattern. (part of circuit diagram displayed)
• Dark screen. Audio OK .
• PSU pulsates. (56KE2610 tips)
• Ragged verticals. (+ extract of circuit diagram)
• Does not tune. Right channel number in display. (extract of circuit diagram attached)
• Frame cramp at top. (+ extract of circuit diagram)
• Difficult start up. If it starts up, picture can be distorted vertically and no functions via RC or front panel. (service info for SIERRA -56KE2610)
• Striations.
• BU508 repeatedly defective after few seconds.
• Ruffled picture as if HT leaking. (part of circuit diagram displayed)
• Switches to standby. depending on picture content.
• 2A mains fuse blown, BUT11A chopper transistor T7686 s/c. D664 (BYD33J) also faulty. (extract of circuit diagram attached)
• Looks like tuner, noise only.
• Power supply is slow to start. (picture attached)
• No vertical deflection.
• Incorrect frame. (+ extract of circuit diagram)
• Barrel effect.
• Converting Pal/Secam.
• No light though sound is fine. (with circuit diagram extract)
• Black screen. Line whistling.
• Defective geometry. Raster appears narrow at the bottom and lengthened at the top part. (picture attached)
• Error codes. (extract of circuit diagram attached)
• Menu reactivation. (56KE2610 tips)
• To improve reliability of SAB3037.
• No start-up from standby. No RC functions.
• No RC functions. (part of circuit diagram displayed)
• Squealing noise. at start-up.
• Interference of fine parallel grid lines.
• No picture on half inch at left.
• Vertical collapse. at bottom.
• Repeated failure of line O/P transistor. (extract of circuit diagram attached)
• When switching the appliance on it starts after a few attempts (standby LED flickers) and stops (LED off). If the appliance is switched on again the same happens.
• No functions.
• Responds to the RC only from 2-3cm. RC OK.
• Whistling. at start-up. (with circuit diagram extract)
• Intermittent loss of channel memory and parameters previously selected by the user.
• Black screen. 'F3' appears on display.
• Vertical jitter. at bottom. (+ extract of circuit diagram)
• Intermittently line output transformer blows.
• In position TXT, F2 on display.
• No TXT (intermittently).
• Several attempts to start up (standby LED flashing) then no function (LED off). When switched on again, same fault occurs. (with circuit diagram extract)
• Intermittent line transistor goes short.
• No start-up. (extract of circuit diagram attached)
• The CTV does not switch on. The 2A fuses are o/c; after replacing them they keep blowing.
• HT and EHT come up for an instant at switch on then main HT drops to a steady 30V.
• Distorted picture.
• Destroying chopper transistor and bridge every few weeks. (with circuit diagram extract)
• Vertical output stage drops out.
• Switches to standby. after a few minutes.
• Poor vertical linearity. (extract of circuit diagram attached)
• After operating normally for a short time the raster disappears on the TV and F3 appears in the display. (+ extract of circuit diagram) (service info for SIERRA -56KE2610)
• BU508 blown repeatedly.
• Coil shaped picture. Can be adjusted to straight picture but remains too narrow.
• No figures on display.
• Changing the vertical deflection-IC TDA3654.
• Over-voltage circuit active. (part of circuit diagram displayed)
• Noise in audio. Picture OK .
• Hum bar going down screen.
• No vertical deflection. intermittently.
• Incorrect frame deflection.
• No picture. (with circuit diagram extract)
• Dark picture.
• Flyback lines in 1 colour during dark scenes. (extract of circuit diagram attached)
• Connection of a loop system to the TV.
• Unstable picture. (extract of circuit diagram attached)
• Frame problem at bottom of screen.
• Line whistling when hot.
• Cannot switch to install menu.
• BU508V keeps blowing. C2618, 2609, D6609, TS7630 and line transformer. (extract of circuit diagram attached)
• Loss of remote control. Latch up. (picture attached)
• Skips channels during tuning.
• Sound was modulated at random by squawks and squeaks. (extract of circuit diagram attached)
• Bright picture. Retrace lines.
• 3cm on the lower picture edge are black. When centered vertically, the line will not move. (+ extract of circuit diagram)
• Negative picture.
• No start-up from standby with RC. Trips. (picture attached)
• Memory loss. (extract of circuit diagram attached)
• Vertical deflection defective and E/W fault.
• Safety test after repair. (service info for SIERRA -56KE2610)
• Poor picture. Low contrast. (part of circuit diagram displayed)
• Raster IC defective after 2 weeks. IC fails occasionally after connecting aerial. (+ extract of circuit diagram)
• No vertical deflection. Picture is reduced to a line which is approx 1cm wide with the bottom part rolled up. (extract of circuit diagram attached)
• No picture, no sound, there is a slight voltage present. The stand-by LED light up. (picture attached)
• No horizontal deflection.
• No synchronisation.
• Trips quickly.
• Cannot be reprogrammed
• Flyback lines. at top.
• Cracking noises from set, causing loss of memory settings. (+ extract of circuit diagram)
• Buzz in audio.
• Tuner drift on non remote sets.
• Power supply dead. Checks shows that there is .6V at the base of the BUT11AF chopper transistor and over 300V at its collector but the circuit won't oscillate. (extract of circuit diagram attached)
• Stuck in standby.
• Focus potentiometer replacement.
• No start-up. intermittently. (+ extract of circuit diagram)
• The CTV does not switch on. 2A fuse blows. Power supply circuit is ok. (56KE2610 tip from SIERRA)
• Blowing mains input fuse. (part of circuit diagram displayed)
• Smearing in picture. after start-up. Flyback lines.
• Intermittent standby. Mute LED flickering.
• Poor vertical synchronisation. Horizontal jitter. intermittently.
• The remote control commands are not received but operating the appliance manually does function. (+ extract of circuit diagram)
• Field jitter, verticals ragged and pulling at switch on. (extract of circuit diagram attached) (56KE2610 SIERRA repair tip)
• BUT11 chopper transistor S/C collector-to-base. (part of circuit diagram displayed)
• Sometimes the appliance fails and a white line appears.
• Intermittently dead.
• Line osc. not running only buzzing noise.
• Safety resistor R3601 goes defective after switch on and then the power supply whistles. (picture attached)
• Stand-by LED is on, but the set does not go to stand-by mode. (part of circuit diagram displayed) (56KE2610 SIERRA repair tip)
• No picture. on upper half screen.
• How to enter channel adjustment menu.
• Sometimes the selected channels for each station are not stored in memory.
• Low brightness with severe Hanover bars.
• Reducing pick-up from PSU and limiting leakage from T7687.
• Power supply trips out (over volt condition).
• Snow in picture. Flyback lines.
• Set goes off after 20 minutes. (extract of circuit diagram attached)
• If TDA3651 or TDA3652 are used as vertical output stage, TDA3653AQ can also be used for 90° picture tubes in case of repair. TDA3654Q can be used for 110° picture tubes. Following changes must be carried out.
• Coloured spots on flat square picture tubes.
• No picture, no sound and the line transformer howls. (part of circuit diagram displayed)
• Pattern on screen. (SIERRA - 56KE2610 information)
• Field IC repeatedly fails. (picture attached) (56KE2610 SIERRA repair tip)
• Horizontal grey line superimposed on it.
• Contrast control inoperative on IC7300, PN7 not varying. (picture attached)
• Unstable and oscillating audio. (part of circuit diagram displayed) (SIERRA - 56KE2610 information)
• Vertical foldover at top. (part of circuit diagram displayed)
• The functions brightness, colour and sound do not work but the display is ok (extract of circuit diagram attached) (56KE2610 tips)
• High contrast. No contrast control.
• Squeaking from EHT stage when cold.
• Diode 6663 goes defective after playing for 2 hours. (with circuit diagram extract)
• Field instability. (extract of circuit diagram attached)
• Dead except line whistle.
• Faulty TXT. (56KE2610 SIERRA repair tip)
• The back-up IC blows always although the appliance is turned off. (+ extract of circuit diagram)
• Display flickers. Shuts down. (picture attached)
• Line output transistor destroyed. (service info for SIERRA -56KE2610)
• Code number for coil S5601. (service info for SIERRA -56KE2610)
• Picture bends in at the sides, variable with brightness. (picture attached)
• No picture. Audio and OSD OK .
• BUT12A blows after a few weeks.
• PSU chirps. (56KE2610 tip from SIERRA)
• Main fuse is burnt. S/C in chopper transistor T7686 (BUT11A). D664 (BYD33J) is also defective.
• Appliance buzzes when put into standby, and won't come out of standby after chopper replaced. (+ extract of circuit diagram)
• Erratic tuning.
• No scanning, the line transformer is ok, fuse 1601 blows at start up. Even if the transformer is disconnected, the power supply starts up. Voltages are ok.
• EHT does not start up.
• Bright raster. Flyback lines. (picture attached)
• Picture looks like a mosaic.
• No signals, no display.
• Enable Hotel mode. Disable hotel mode. (service info for SIERRA -56KE2610)
• No demagnetization, no voltage, after 2-3 secs fails again.
• Ringing in picture.
• Deguass/dead/ht shuts down after 2-3 seconds.
• Line stage whistles when warm.
• Does not switch to standby. (picture attached)
• Fine lines on picture.
• New channels cannot be installed.
• Lines on picture, different brightness between lines and the lines move about.
• Dead. No standby light or channel indicators on. Mains fuse O/C. (+ extract of circuit diagram)
• Whistling.
• Set not tuning right, battery ok.
• Black lines in the picture, especially on brightness and text picture.
• Ragged verticals and line output transformer sings.
• Reduced horizontal size. (part of circuit diagram displayed)
• Intermittent loss/predominance of one of the three primary colours (R, G or B).
• No shutdown with RC.
• Cycles on/off. Flashing display.
• Fuse 1601 blows at start up. Power supply transformer makes a whistling noise. T7599 ok. C2608 and zener 6604 OK. Line transformer ok. Line BU OK.
• The display does not function (commands brightness, colour and sound). (extract of circuit diagram attached)
• Poor picture because the appliance continues searching for channels. A good synch. pulse is not present on pin 28 of the tuner.
• Appliance does not function, squeaking sound when turned on.
• Field collapse every few days intermittently. (+ extract of circuit diagram)
• Varying 140V ht line. (part of circuit diagram displayed)
• Green spot.
• Fluctuating picture both horizontally and vertically with increased volume. Picture is fine at low volume. (picture attached)
• Stand-by LED flashes or lights up spontaneously.
• Vertical bars in left picture side.
• Black lines in picture.
• Power supply tripping, whistling, arcing sound from scan yoke assembly, possibly some smoke from main PCB. (extract of circuit diagram attached)
• Stuck in standby. Buzz coming from appliance. (56KE2610 tips)
• Colour decoder Pal-Secam.
• No function. Mains power switches on and off with whistling tone.
• Enter service mode.
• No start-up. Standby LED flashes .
• No signal. intermittently.
• Vertical collapse (intermittently).
• Jumping and line tearing, varies according to content. (+ extract of circuit diagram)
• Tuning erratic after changing battery.
• Intermittent net curtain effect.
• Cracking noises from set when first switched on from cold, causing loss of memory settings for the brightness. Then set dead. (+ extract of circuit diagram)
• Squealing noise. (picture attached) (56KE2610 tip from SIERRA)
• Standby LED does not light.
• 140V voltage supply varies. (with circuit diagram extract)
• Picture shifted upwards.
• Raster cramped at the bottom and stretched at the top (+ extract of circuit diagram)
• After a few minutes line ripple appears, followed by fading picture and sound. (SIERRA - 56KE2610 information)
• The appliance does not switch on. F3 appears on the display. (56KE2610 SIERRA repair tip)
• F0 in the display, PSU does not function.
• Egg-shaped picture. (extract of circuit diagram attached)
• Appliance quits, no picture, no sound, no display and power supply whistles. Raster possibly too large. (+ extract of circuit diagram)
• No TXT.
• Moire effect.
• Flashing picture. Flashing display.
• Black screen. PSU whistles.
• Dead. (extract of circuit diagram attached)
• Fuse 1651 blown. (extract of circuit diagram attached)
• Low HV.
• Poor synchronisation. (+ extract of circuit diagram)
• No operation.
• Working voltage +140V goes under 80V.
• Line output transistor S/C. (with circuit diagram extract)
• BU508 cuts out after playing approx. 5 minutes. (extract of circuit diagram attached)
• Occasionally no sound and no picture. Black screen and E5 on display. Starts up again when pressing programme +.
• Ticking noise. in standby. (+ extract of circuit diagram)
• Blank raster. Audio OK . (with circuit diagram extract)
• 140V goes high.
• PSU whistles. (+ extract of circuit diagram)
• Back up battery has a higher failure rate. (picture attached)
• No sound on P1. Blank raster. (picture attached)
• No contrast control. (picture attached)
• SOPS radiation. (with circuit diagram extract)
• Test pattern is egg-shaped.
• Dark picture. TV starts. Horizontal stripe appears when voltage on G2 is increased
• Smeary, broken colours at left hand side plus too much saturation. (+ extract of circuit diagram)
• White raster with flyback lines, trips after 20 seconds. (part of circuit diagram displayed)
• Torn picture. Noise in audio.
• Unusual channel selector fault, as though the memory is useless.
• Zebra-striped vertical lines. Picture is a bit oversized.
• Insufficient height with cramping and centre crossover distortion. (picture attached)
• Lines in picture. at top . (with circuit diagram extract)
• Bright raster. Flyback lines. Fault occurs intermittently. . (picture attached)
• After playing for a short time TS7618 (BU508V) blows. (SIERRA - 56KE2610 information)
• Low contrast after Q201 and TA7698 have been replaced.
• At switch on, intermittent squealing from line stage.
• Tuning drifts. Memory loss.
• Tripped.
• Dead or intermittently dead. (56KE2610 SIERRA repair tip)
• No start up. Pumping noise.
• Picture jumps at channel switch over.
• Incorrect code number Pos. 7618.
• Dead. Line output transistor and regulator S/C.
• Stripes in picture.
• Switches to protection mode. after start-up.
• Excessive brightness. Flyback lines.
• When first switched on intermittent squealing from line timebase.
• Memory loss. after start-up. (with circuit diagram extract)
• Colours rolling.
• Intermittent shut down of the PSU. (part of circuit diagram displayed)
• Pincushion distortion. No E/W correction.
• Field jitter. After field IC has been replaced there is field foldover. (+ extract of circuit diagram)
• Switches on by itself. intermittently.