SA66K902 / SIERRA [TV 70-74 (66-70) cm picture]

• No power supply. Protection circuit triggered. (extract of circuit diagram attached)
• No E-W. Reduced width. (picture attached)
• Bright flash on screen, no picture or sound. (picture attached)
• Dark picture. Weak colour. (picture attached)
• Bu i netdel kortslutter (per.)
• No tuning on some channels.
• The picture's width varies and the convergence constantly jumps. (with circuit diagram extract)
• Outer lines cannot be straightened. (picture attached)
• The picture runs and pulls (distorted), strong signal. (extract of circuit diagram attached)
• No vertical deflection.
• Fuse switches when changing channel and picture. (extract of circuit diagram attached)
• Top few lines foldover. (+ extract of circuit diagram)
• Grey scale drifts slightly.
• Picture tube problems.
• Picture is missing, raster poor or varies, sound ok.
• Pumps (E-W correction is defective). (extract of circuit diagram attached)
• Contrast control does not function or is unstable.
• The red-green convergence is faulty. (part of circuit diagram displayed)
• Supply voltage is guzzled.
• Width, E/W correction and the trapezoidal pot(s) do not function. (+ extract of circuit diagram)
• Little or no vertical scan. (part of circuit diagram displayed)
• The power supply functions irregularly. (with circuit diagram extract)
• Flyback lines and picture cannot be made darker. (part of circuit diagram displayed)
• Dead.
• K9/K11 band switch.
• Dark picture, weak colours. (picture attached)
• The appliance gurgles occasionally after extreme luminance variations and when starting up the appliance. (with circuit diagram extract)
• Picture height is only 10cm. 10cm line from picture centre. (with circuit diagram extract)
• Blue convergence.
• Picture skips to the left. (picture attached)
• The picture becomes crooked on the lower side.
• Switches on with 12, all channels are noisy.
• Low vertical, 2" picture. (SA66K902 SIERRA repair tip)
• Set comes on after a while.
• Cramp at bottom of picture. (picture attached)
• E-W fault. (with circuit diagram extract)
• The picture enlarges and decreases in size during operation. (with circuit diagram extract)
• Squealing from PSU. (with circuit diagram extract)
• No horizontal hold. (with circuit diagram extract)
• HT low. (part of circuit diagram displayed)
• Repair method: PSU.
• IC TDA2571AQ (4822 209 80646) no longer available.
• No audio. No picture. (+ extract of circuit diagram)
• Convergence pot R672 and R717 do not control enough. Red-green does not coincide. (with circuit diagram extract)
• Bowed horizontals.
• No colour. (with circuit diagram extract)
• Thick white lines in the upper part of the picture. (picture attached)
• No north-south correction. (+ extract of circuit diagram)
• Width pulsates. (with circuit diagram extract)
• Connection of a loop system to the TV. (SA66K902 SIERRA repair tip)
• The luminance disappears. (part of circuit diagram displayed)
• BU208 fails continuously.
• The picture is blurry and then disappears.
• No picture, no raster. (extract of circuit diagram attached)
• Horizontal picture has shifted downwards.
• No video and reduced width.
• Flyback lines in picture.
• Sometimes vertical line appears in picture.
• Fuse VL170 is defective. (picture attached)
• N/S correction is faulty, curves in the upper and lower parts of the picture. All regulators do not function. (with circuit diagram extract) (service info for SIERRA -SA66K902)
• Intermittent. Gurgles or vertical lines are present. (+ extract of circuit diagram)
• Blows mains fuse 1-2 hrs. (+ extract of circuit diagram)
• The power supply makes a high whistling noise, otherwise the appliance functions properly. (part of circuit diagram displayed) (SIERRA - SA66K902 information)
• Gulps at switch off.
• Tuning drifts. (SA66K902 tip from SIERRA)
• Horizontals at top and bottom curve into the middle.
• Channel 2 overload. (part of circuit diagram displayed)
• Is occasionally unfocused (fault in the video amplifier). (part of circuit diagram displayed) (service info for SIERRA -SA66K902)
• Occasionally sound is too low or fails.
• Bowing at bottom of picture. (with circuit diagram extract)
• Sometimes picture disappears. Wrong channel LEDs light up. (+ extract of circuit diagram)
• Tripping only with tripler connected (No picture, no sound). (+ extract of circuit diagram)
• Gulps occasionally.
• No power and rail voltage 19V only.
• Afterglow fleck at switch off.
• Top of picture cramped. (part of circuit diagram displayed)
• Safety test after repair.
• Horizontal shift. No colour. (extract of circuit diagram attached)
• Rolling, no contrast and over bright picture.
• Goes for about 1/2hr rapidly switches on/off. (part of circuit diagram displayed) (SA66K902 SIERRA repair tip)
• Incorrect or unstable picture size.
• TXT lines are visible in the upper part of the picture. Approx 3cm away from the upper edge of the picture (picture attached)
• Picture grainy and sound noisy.
• Flyback lines in the picture.
• Brightness control does not function.
• Red, green or blue picture.
• Line choke S172 squeaks. At switch off lights up like a Christmas tree. (+ extract of circuit diagram)
• Insufficient saturation.
• Poor convergence top 4"blacked out. (part of circuit diagram displayed)
• Vertical flybacks visible at the top edge of the TXT stations.
• Reduced horizontal size. (with circuit diagram extract)
• Hum in audio. (with circuit diagram extract)
• E/W error. Picture width is too small. Controls do not react.
• No function, a gurgling sound may be present. (picture attached)
• PSU switches (from 162V).
• Poor adjustment of convergence at top and bottom. (+ extract of circuit diagram)
• Noise in picture.
• The sound controls unevenly.
• Sound fades after short while.
• PSU switches on (no pumping). No switch on with slow power up. (+ extract of circuit diagram)
• Flyback lines or top of picture is shaded.
• No picture. Sound ok.
• Jumps from channel 1 to 3.
• Unstable frame control or frame jitter or frame synchronisation missing or lack of height.
• Low horizontal amplitude after protection disabled by O/C 6560. (+ extract of circuit diagram)
• Lines in lower part of picture. (with circuit diagram extract)
• Intermittent North/south fault, in cold conditions ok.
• Appliance pulsates
• There is a black line in the upper part of the picture, only part of the picture is visible. (part of circuit diagram displayed)
• Retrace lines when channels change. (with circuit diagram extract)
• Blue convergence, R667 (above horizontally) does not function. (+ extract of circuit diagram)
• Weak vertical synchronisation. (SA66K902 tip from SIERRA)
• Top foldover and retrace lines. (extract of circuit diagram attached)
• Vertical collapse.
• Only pumps. (part of circuit diagram displayed)
• Bowed verticals.
• Trips. (picture attached)
• Lines in upper picture section.
• Either red, green or blue colour difference signal is missing. (SA66K902 tips)
• Low brightness.
• Sometimes the power supply breaks down after a short period. (picture attached)
• PSU hiccups with HV and sound.
• Intermittent pin cushion distortion.
• Picture is too small./
• No start-up (intermittently). (part of circuit diagram displayed)
• No colour or very weak green. (extract of circuit diagram attached)
• Lines in top part of picture. (part of circuit diagram displayed)
• Blank raster.
• Horizontal tearing at bottom. (extract of circuit diagram attached)
• No picture.
• Vertical lines on the left on blank raster/parasitic oscillation. (part of circuit diagram displayed)
• Vertical foldover on top of screen. (with circuit diagram extract)
• Top and bottom horizontals curve into the middle plus colour fault.
• Picture shading from left to right.
• Crackles, rattles and the volume control is blocked. (+ extract of circuit diagram) (SA66K902 SIERRA repair tip)
• Channel selector V311 is no longer available, will be V317.
• Various picture problems.
• Picture gets darker; no colours (blue and red). (with circuit diagram extract)
• Curved sides, plus another possible line fault.
• Weak horizontal synchronisation. (+ extract of circuit diagram) (SA66K902 tip from SIERRA)
• The colour is faulty. (extract of circuit diagram attached)
• No start-up.
• Defective dynamic convergence. (SIERRA - SA66K902 information)
• Two horizontal bands of white dots. (part of circuit diagram displayed)
• No function, a sluggish gurgling sound is present in the power supply. (picture attached)
• No HV. (with circuit diagram extract)
• Striations or thin flyback lines.
• No function, a high voltage is present. (extract of circuit diagram attached)
• Occasionally a line appears on screen (skips).
• Convergence fault. (+ extract of circuit diagram)
• Picture is too bright, flyback lines, screen is darker on left side. (with circuit diagram extract)
• Trapezoid shaped raster.
• Severe AGC overload. (extract of circuit diagram attached)
• Horizontal synchronisation does not lock. (part of circuit diagram displayed) (SA66K902 SIERRA repair tip)
• Convergence changes.
• No E/W correction or low/width striations on the right hand side. (with circuit diagram extract)
• One colour missing (dark picture).
• Dead. 95V supply 15V.
• Picture rolls in at the bottom or a line appears in top third of screen.
• The upper part of the picture is not complete. (extract of circuit diagram attached)
• Contrast and/or brightness do not function.
• New high voltage tripler.
• Sometimes horizontal output stage (drive) fails.
• The colour is unstable in the background; after being adjusted, it changes completely after a short period. (with circuit diagram extract)
• Line collapse, lack of width or small picture.
• Picture fails
• North-South fault. (extract of circuit diagram attached) (SIERRA - SA66K902 information)
• No functions. (with circuit diagram extract)
• Blown chopper transistor.
• Striations down left hand side of picture.
• The appliance does not start. Gurgling noise in the sound and with high frequency. The appliance occasionally starts but has an unstable picture and then becomes intermittent again. (+ extract of circuit diagram) (SIERRA - SA66K902 information)
• Patterning on screen. (SA66K902 tips)
• Purity problems.
• Picture is missing, sound missing or poor.
• Vertical picture shifted to left.
• Line output transistor T 446 fails repeatedly. (SA66K902 SIERRA repair tip)