56K7527 / SIERRA [TV 56 (52) cm picture]

• Connection of a loop system to the TV.
• No start-up. (part of circuit diagram displayed)
• Picture turns red, green or blue with flyback lines.
• Picture turns white with flyback lines and fails. (+ extract of circuit diagram)
• Vertical interference lines in all of the picture during UHF and VHF. No flyback lines.
• The picture turns a glaring red, green, blue, it may occur only after some time
• +12V supply adjustment.
• Green picture. Shuts down.
• No line tracking. (picture attached)
• Weak colours. Flyback lines. (+ extract of circuit diagram)
• Volume varies.
• Switching on appliance a hiccuping operation is noted.
• Hum, picture and sound cut out. (part of circuit diagram displayed)
• Vertical deflection fault. Pincushion distortion. Horizontal line on picture.
• Switching on/off rapidly, slow loud hiccupping.
• Picture jitters. at top.
• Tuning is faulty, snow on UHF, no band III, the fault occurs after spraying. (with circuit diagram extract)
• Shuts down (intermittently).
• With light picture contents the mains gurgles once.
• Audio is set to maximum. The display control does not function. (picture attached)
• Horizontal streaks across picture.
• Picture and sound have rhythmical interference, even without the station, tuning voltage varies.
• Is occasionally intermittent.
• Slight east/west problem (with circuit diagram extract)
• Horizontal sync adjustment.
• After working for a few hours, loss of memory and no tuning seach.
• EHT (excessive). (56K7527 tip from SIERRA)
• The sound varies: soft and loud.
• Top scan only.
• Overvoltage protection adjustment.
• Searches for channels continuously.
• One colour missing.
• Low humming noise (B+ 49V) - set not hiccupping. (picture attached)
• Barrel shaped picture.
• No contrast. (+ extract of circuit diagram)
• Wavy lines are visible vertically.
• Colour phase is faulty, reverse blocking lines. (picture attached)
• The picture is too small and disappears. (with circuit diagram extract)
• Channels cannot be switched over also there are no analogous functions. (56K7527 tip from SIERRA)
• Bright raster, M6 too high (extract of circuit diagram attached)
• Shuts down. after a while.
• Intermittent bottom cramp (poor bottom line). (part of circuit diagram displayed)
• HF AGC adjustment.
• No picture, sound is present, flashing occurs when switching off. (with circuit diagram extract)
• The appliance makes a light gurgling sound, occurs occasionally after some time.
• Picture ringing, double vision.
• RC and control panel operation do not function (only 1 channel).
• No luminance. Colour OK .
• Clock TXT decoder adjustment without measurement equipment. (56K7527 tip from SIERRA)
• Does not change channels. Audio and picture OK .
• Varicap voltage adjustment.
• No picture and no sound - only a little noise in the sound. The channels cannot be tuned. (part of circuit diagram displayed)
• No colour. after a while.
• PSU pulsates. (extract of circuit diagram attached)
• Fuse 562 is defective. After replacing it the appliance functions.
• The appliance does not identify the programmes.
• Lower vertical foldover. (with circuit diagram extract)
• Change of mains switch order number.
• Vertical sync adjustment.
• Does not tune to optimum. Station is tuned too sharply.
• 5.5MHz blanking circuit adjustment.
• Picture turns bright red, green or blue, flyback lines and then fails.
• Vertical foldover at the bottom, stretched and jittering at the top. (with circuit diagram extract)
• TV does not switch on; there is only the M1 voltage = 285V. (picture attached)
• Impossible to adjust the East/West module (U555). The raster remains distorted (narrow) in the lower part of the screen while the top part is wide. (extract of circuit diagram attached) (SIERRA - 56K7527 information)
• Tuning drifts.
• Blurry picture. (picture attached)
• No vertical deflection. intermittently.
• No programming. Dark screen.
• Lower side of picture is black.
• No switching between UHF and VHF. Switching voltage is 10V on both at the same time.
• Memory loss. (with circuit diagram extract)
• Hiccuping. (with circuit diagram extract)
• Horizontal lines.
• No audio (intermittently).
• Disturbance lines and shaky picture.
• The appliance gurgles, the picture and sound disappear. (+ extract of circuit diagram)
• No HT, loss of display. Power supply OK.
• Burnt high voltage cable at the picture tube. (+ extract of circuit diagram)
• Cycles on/off.
• The connected video recorder produces a freeze frame that shakes and jumps.
• Blank picture, the sound is present. The appliance switches over. (part of circuit diagram displayed)
• After switching to TXT, only TXT mode is displayed but no TXT appears.
• E/W fault. intermittently. (part of circuit diagram displayed)
• Focus potentiometer.
• No VCR, no sound, blank raster. (picture attached)
• The picture lightens up, the appliance gurgles due to a high beam current. (+ extract of circuit diagram)
• Screen turns bright. Hiccups. Black, horizontal line in the picture. (56K7527 tips)
• Bright picture with retrace lines first, then picture cuts out.
• The picture is too small and East/West correction is incorrect.
• The appliance gurgles with high voltage and sound. No picture.
• Auxiliary oscillator adjustment. (SIERRA - 56K7527 information)
• Wow and flutter. Knock sensitive.
• The picture distorts in the corners, it is sideways to the middle. (part of circuit diagram displayed)
• Blank raster. No audio. (+ extract of circuit diagram)
• Blocks.
• No memory.
• Power supply does not function. (with circuit diagram extract)
• East-west amplitude cannot be controlled easily. The picture's width varies when the contrast is changed. (extract of circuit diagram attached)
• Horizontal ripple lines. Everything is ok after dismounting the AFC plug on U535.
• In display only even nos light up.
• The upper part of the picture pulls up.
• No colour. (with circuit diagram extract)
• White lines in the middle of the picture. (with circuit diagram extract)
• Horizontal size varies. Knock sensitive.
• Screen turns bright. Appliance gulps.
• Horizontal white line. Audio OK .
• Screen is only white and there is no rustling noise. (extract of circuit diagram attached)
• The picture is defective, horizontal lines. (extract of circuit diagram attached)
• Safety test after repair.
• White screen.
• No vertical synchronisation. (part of circuit diagram displayed)
• No tuning. only on certain channels.
• Sound unit (10W-HiFi).
• When search is switched on, the appliance no longer stops and the screen darkens. (with circuit diagram extract)
• Line across picture and squealing noise. (part of circuit diagram displayed)
• The raster becomes dark and red.
• No brightness control. Retrace lines. (extract of circuit diagram attached)
• Band 4 and 5 does not function.
• Weak or no contrast. (part of circuit diagram displayed)
• Tripping. at start-up.
• The chroma is next to the rasters, even if the colour fails. (service info for SIERRA -56K7527)
• No line synchronisation. (part of circuit diagram displayed)
• The indication LEDs do not come on.
• Sound module IC TDA2610Q no longer available.
• No picture. Switches off by itself.
• Replacing TDA2523 with TDA2525.
• 5.5MHz adjustment - Sound section.
• Channel drift.
• Blank picture and gurgling is present, U12 is not present. (with circuit diagram extract)
• The picture turns dark after some colour occasionally disappears.
• White lines in the middle of the picture and no sound. (service info for SIERRA -56K7527)
• Greyscale adjustment.
• TV has poor luminosity and every now and then the picture shrinks at the centre forming a horizontal thin line.
• Burst keying-out pulse adjustment.
• +145V supply voltage adjustment.
• The remote control does not function. The green LED lights up irregularly.
• Pincushion distortion.
• The picture is covered by horizontal black stripes.
• Channel 2 and channel 7 flashing.
• 4.43MHz trap adjustment - Luminance circuit.
• Touch controls do not function.
• No functions. (with circuit diagram extract)
• Red smear on picture.
• No tuning.
• Supply section oscillator adjustment. (SIERRA - 56K7527 information)
• The picture is distorted and folds over at the bottom. (+ extract of circuit diagram)
• Picture is pinched in in the middle. (+ extract of circuit diagram)
• Colour is faulty, flyback lines and smoke from R610. (+ extract of circuit diagram)
• Channel selector V311 no longer available, will be V317.
• Reduced vertical deflection. No E/W correction. (with circuit diagram extract)
• Flyback lines. (56K7527 SIERRA repair tip)
• Uniform faded picture. (service info for SIERRA -56K7527)
• All functions are distorted during operation.
• Tip buttons do not work.
• Lines in the picture caused by loose contacts on the module contact plug. (with circuit diagram extract)
• R.G.B. amplifiers.
• Frame module without IC TDA2780 (not enough in supply).
• No function, the power supply gurgles a little. (part of circuit diagram displayed)
• Code numbers of the phosphor bronze connections.
• Colour purity adjustment.
• Blue picture. after a while. Switches off by itself.
• 140V = 70-80V. Set comes on after a while. (56K7527 tip from SIERRA)
• Picture is upside down.
• Dynamic convergence adjustment.
• Crooked horizontal deflection at the top and bottom of the picture (looks like op east/west fault). (+ extract of circuit diagram)
• The focus unit is replaced.
• Rolled up picture in the bottom part of the screen.
• Does not function with manual operation but does function with remote control.
• No picture. Audio and HV OK . (part of circuit diagram displayed) (56K7527 tip from SIERRA)
• Occasionally switches off (beam current). (picture attached)
• No function, the appliance gurgles.
• Sibilance. (with circuit diagram extract)
• The appliance cannot be tuned (remains blocked on one channel).
• Inverted picture.
• Dark picture. intermittently. (56K7527 tip from SIERRA)
• General information.
• Reduced vertical size. (extract of circuit diagram attached)
• The picture distorts - appears overcontrolled. The picture is a little too small. (extract of circuit diagram attached)
• Picture gets lighter, flyback lines, then appliance fails (even after a short playing time).
• When switching on the TV is ok. After a few minutes when adjusting the saturation it moves frequency.
• The TV does not switch on from the switch but only from the remote control.
• Blown chopper. (with circuit diagram extract)
• No vertical deflection. (+ extract of circuit diagram)
• After switching the appliance on, it is not tuned. After switching to another channel, the tuning is o.k. again.
• VCR time constant: 26 C 668. (service info for SIERRA -56K7527)
• Line output transistor fails repeatedly.
• Picture too small. (+ extract of circuit diagram)
• No picture. No sound. Screen is grey. Occasionally sync is poor.
• No power supply, no 145V when loading with lamp, no LT. (with circuit diagram extract) (56K7527 tips)
• No E/W correction. (+ extract of circuit diagram)
• High peeping sound, the television functions properly otherwise, the line transformer is ok. (extract of circuit diagram attached)
• Standardised chroma module.
• Blank raster and the high frequency cable connection on the picture is burnt out. (extract of circuit diagram attached) (56K7527 SIERRA repair tip)
• The raster is egg shaped.
• Vertical collapse.
• Modification to be carried out on the chroma module in the event of replacing the IC TDA2523 with the TDA2525.
• Every few hours appliance independently switches on and off for a short time.
• Bright/dark interference stripes. Picture may disappear intermittently
• Picture linearity is faulty, the east/ west correction distorts occasionally. (part of circuit diagram displayed) (service info for SIERRA -56K7527)
• No or poor audio. (with circuit diagram extract)
• The picture darkens when the colour is turned up.
• Dead. (+ extract of circuit diagram)