37K7225 / SIERRA [TV 36/37 (34-36) cm picture]

• Defective E/W correction. Foldover of vertical elements in picture.
• Tuning drifts.
• Colour flashing.
• Protection mode activated.
• Faulty TXT.
• Text appears to be scrambled, but ok in mixed mode.
• Picture would occasionally oscillate in size, very intermittent fault.
• Intermittent black lines at top of picture.
• Blown fuse FS1191 (3.15A).
• Switches on/off with a slight noise.
• Set would work normally for day but it would then suddenly trip two or three times, following by line pulling then shut down.
• Incorrect vertical centering.
• Intermittent loss of signals, leaving a noise free raster.
• Ghosting effect. (37K7225 tip from SIERRA)
• Low brightness.
• Video is missing, small amount of chroma.
• White screen. Audio OK .
• Intermittent audio.
• Afterglow at switch off. (37K7225 SIERRA repair tip)
• Retrace lines (intermittently).
• Interference usually with bright scenes with colours disappearing into hum bars. (37K7225 SIERRA repair tip)
• Grey screen.
• The TV does not switch on. A loud buzzing can be heard.
• Replacement of tuner ECL2006 with UV418.
• Teletext is missing or intermittently corrupted.
• 1/2 vertical scan.
• Picture blanking on left side and cramping at bottom.
• Dark picture.
• No green.
• Dropouts and EHT discharges when switching from very bright scenes to dark scenes (and vice versa). (37K7225 tip from SIERRA)
• No start-up. Protection mode activated.
• Safety test after repair.
• Switches on then off. EHT discharge is earthed.
• Dropouts.
• Modification for over sensitive trip circuit
• No picture. Picture tube is hot and makes sounds.
• Replacement of IC SAF1031P with SAF1039P.
• Vertical lines.
• Picture alterations. (37K7225 tip from SIERRA)
• Regulator blows at switch on.
• Intermittent and unpredictable faults on sets with the tuner preset draws.
• PSU pulsates. No picture. No audio. LED is red .
• Coloured spot after switch off.
• No picture.
• Tripping 2 to 3 times then has line pulling.
• Lower part of TXT display moving sideways.
• Dark picture when strong aerial input signal is present.
• Distorted audio.
• Tripping. intermittently. White screen.
• The picture width cannot be controlled.
• Service tips connected on Japanese VCR's. (37K7225 tips)
• Blank screen. after warm-up.
• No E/W correction. Pincushion distortion.
• Blows chopper.
• No or poor audio. Picture OK .
• Brightness uncontrollable at max.
• Horizontal size varies.
• Line synchronisation and frame synchronisation are missing. (37K7225 SIERRA repair tip)
• No functions. Stuck in standby.
• Bright picture.
• Horizontal roll.
• Intense brightness present occasionally with flash back lines.
• Intermittent spontaneous variations of user control levels (brightness, contrast, etc.)
• White screen. Flyback lines.
• Plopping on sound.
• Connection of a loop system to the TV.
• Tripping.
• Hanover bars.
• Remote working but not manual channel change or manual volume up/down, also on teletext if buttons only just touched, would double up or more on the numbers.
• No 9V.
• No or poor picture. Audio OK .
• No response to RC station and front panel commands, although appropriate LED flickers showing commands are being received.
• No or intermittent audio.
• No picture. Audio OK .
• Reduced horizontal size.
• Rolling when brightness or contrast varied. (service info for SIERRA -37K7225)
• No output from chopper control chip (TDA2581).
• Changes channels by itselt; going from even to odd programme.
• Cramp at bottom of picture.
• Stuck in standby.
• Line pairing disappears when brilliance/contrast is reduced.
• No picture. after warm-up.
• After operating for several hours, field contracts and severe fold over at the bottom.
• Wide band of TXT lines in picture.
• Trips (intermittently).
• Distorted E/W. No width adjustment.
• Power supply makes a gurgling noise. 300V are present.
• IC TDA2571AQ (4822 209 80646) no longer available.
• One colour missing.
• Intermittently goes to standby when trying to switch on. Impossible to change channels.
• Excessive red.
• Focus problems.
• Incorrect purity.
• No synchronisation.
• No red.
• Replacing TDA2523 with TDA2525.
• Poor picture quality, smearing, milkiness, glistening peak whites or insufficient brightness.
• Will not change channels and sometimes go to standby mode when first switched on.
• Power supply dead, protection circuit triggered.
• Too much brightness and/or very low contrast permanently or intermittently.
• No picture, blank raster until screen advanced then light screen with flyback lines.
• User commands not responding and RC indicator lit permanently.
• Peak white raster.
• No green signal output from IC (TDA3560).
• No flyback blanking.
• Only standby after switch on via power switch.
• No picture, just a smear on chroma.
• No red, permanently or intermittently.
• Insufficient height and vertical linearity incorrect when warm.
• Vertical foldover at top.
• Intermittent shut off 1sec then OK (picture size varies).
• Flyback lines, picture turns white and disappears.
• Hiccupping.
• When switched on from cold there would be intermittent line failure, wriggle flashing down the middle and tripping occurred.
• No line synchronisation.
• The appliance does not function, the power supply gurgles; this can be heard slightly in the sound.
• Ok at switch on, but bending off verticals at the top of screen, getting worse as set warms up.
• Intermittently spontaneous variations of the user control levels (brightness, contrast, etc.).
• Excessive green.
• No synchronisation. in TXT.
• Poor sound (after module replaced).
• Intermittent volume, brightness or colour changes.
• No raster.
• Hiccupping and low brilliance. (37K7225 SIERRA repair tip)
• Patterns in picture.
• No or currupt TXT.
• Picture too green and cannot be adjusted. It improves after a while, picture tube OK.
• Picture goes to peak brilliance, then hiccups.
• Shuts down. after warm-up.
• Does not start up. F3 appears on display.
• No vertical deflection.
• No TXT.
• Intermittent dropouts at switch on.
• Shuts down then switches-on on very bright screen repeatedly.
• Processing of "not standard" signals.
• Intermittent flashing lines. Intermittent snow.
• Width and east/west co-ordination are faulty.
• Decoding errors on teletext.
• Vertical bounce. Reduced vertical size.
• Bottom of TXT pulls.
• Venetian blind effect.
• Low horizontal amplitude after protection disabled by O/C 6560.
• Display only shows channel numbers. E1 and channels cannot be adjusted.
• Excessive vertical size. Picture rolls.
• Power supply "hiccups" when switching fluorescent lights on or off.
• Insufficient voltages in the HT line.
• 14" picture tube.
• No vertical synchronisation.
• Humm and buzz and distorted picture.
• Horizontal oscillation.
• Back up battery (1.2V) has a higher power failure rate.
• Intermittent colour.
• Coloured area on black and white picture.
• AGC problems.
• Works ok for days then suddenly trips 2 or 3 times, followed by line pulling then shut down.
• Spot on left side after switch off.
• No function with manual or remote control operation apart from off/on.
• Incorrect horizontal centering.
• Channel change is not possible. Sometimes TV goes into standby and tries to switch on.
• No blue. (service info for SIERRA -37K7225)
• Intermittent audio.
• No or weak colour. (37K7225 tip from SIERRA)
• No picture. Raster OK .
• When cold HT varies.
• No remote functions, remote control LED is on.
• Horizontal ripples
• Speaker problems.
• Erratic operation of channel change and/or RC.
• Intermittently volume increases by itself.
• Maximum uncontrollable brightness.
• Picture pulling at bottom of the text display.
• 4 inches at the centre of the picture has teletext lines.
• Noise on picture and slight flashovers on sound.
• No audio. No picture.
• Starts up with retrace lines then shuts down after a while.
• Rail voltage is only 83V.
• No picture. Partial chroma displayed. (37K7225 SIERRA repair tip)
• Blank screen.
• Loud audio.
• No function, fuse V1291 is defective. (SIERRA - 37K7225 information)
• Poor horizontal synchronisation.
• Colour control does not function.
• No colour. after a while.
• Lines in picture. at top .
• Frame scan too big or too small. (SIERRA - 37K7225 information)
• Changed code numbers. (37K7225 SIERRA repair tip)
• Hiss in audio.
• Intermittent or no colour.
• Protection mode activated. Bright raster.
• Onbe colour is lost.
• No picture. Blank raster. after a few minutes.
• Field scanning collapses to a non-linear six-inch band through the middle of the screen.
• Narrow white bright line superimposed across the centre of the screen.
• Vertical collapse.
• No functions. after start-up. Fault occurs intermittently. .
• Dead. Hiccups.
• Excessive brightness. Flyback lines. Vertical jitter.
• Colour fades to black and white after 2-3 hours. OK if left off for 10 mins then switched back on; then fault repeats.
• Curved verticals, worse when warm.
• No green.
• Tripping with tripler disconnected.
• Tuning drifts.
• Poor channel set-up. Picture quivers.
• No horizontal deflection.
• Background noise.
• Power supply ticking, OK when tripler disconnected.
• Will not stop in search mode on K5 and/or K21. (37K7225 tips)
• Vertical foldover at bottom. after a few hours.
• Bent verticals getting more severe as appliance warms up.
• Dead. (SIERRA - 37K7225 information)
• No function, 300V can be measured at electrolytic C460. (service info for SIERRA -37K7225)
• Rustling in VHF. EHT discharge.
• No colour. after warm-up.
• High sound level.
• When switched off in standby an horizontal bar appears across picture tube. No audio.
• Lack of min. chroma. (SIERRA - 37K7225 information)
• No blue permanently or intermittently.
• Predominance or intermittent loss of one of the three primary colours (red, green or blue).
• Horizontal bars. intermittently. (service info for SIERRA -37K7225)
• Bottom foldover, top stretch.
• No horizontal output.
• Lines in picture when using Japanese video appliances.
• Excessive blue.
• Line oscillator off frequency.
• No RC functions. No front panel function.
• Uncontrollable bright raster with flyback lines.
• Intermittently volume at maximum.
• Intermittent colour.
• Flyback lines dependent on brightness/contrast settings.
• No or intermittent picture. after warm-up.
• Pulling at the bottom of the text display.
• Poor vertical linearity.
• Blank raster. Flyback lines.
• No HV.
• One or two colours are lost.
• Loss of one or two colours.
• No tuning. only on certain channels. (37K7225 tips)
• No red. (37K7225 tips)
• The picture is too big, the coil S490 is burnt.
• Power supply transistor 7156 S/C.
• Top of screen has partial field collapse.
• Pincushion distortion. on sides.
• Retrace lines G2 high.
• Picture is poor or missing and/or sound is poor or missing.
• No low band.
• On video text several letters are missing (mix-up).
• No green, permanently or intermittently.
• Dark picture when tuned to a strong picture, ok when tuned to a weak picture.