20GR1055 / PHILIPS [TV]

• Set does not retune or program etc
• Poor synchronisation. when cold. (+ extract of circuit diagram)
• Green picture. (extract of circuit diagram attached)
• Dead with whistling noise coming from power supply. (extract of circuit diagram attached)
• Sound increases intermittently or "pops", especially during bright scenes. (picture attached)
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (with circuit diagram extract)
• No tuning bar when install button pressed and set not in hotel mode. (extract of circuit diagram attached)
• Whistling from PSU. (part of circuit diagram displayed)
• U743 tuner replacement. (picture attached)
• Failures in the power supply. (picture attached)
• No picture. No sound. Purring sound in loudspeaker. (extract of circuit diagram attached)
• Line down middle of screen. (part of circuit diagram displayed)
• After working normally for a while the TV blocks in any position. The functions do not work.
• Poor sync. AGC fault.
• Low 5V to micro chip. (+ extract of circuit diagram) (20GR1055 tips)
• Change of C2523.
• No power with abnormal sound. (picture attached)
• SIF DET adjustment procedure.
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (extract of circuit diagram attached)
• Dead set. Tries to start.
• No tuning, no remote volume control. (extract of circuit diagram attached)
• Horizontal oscillator adjustment procedure.
• Vertical oscillator adjustment procedure.
• Lines across top of picture about 8" in first 100 lines. (part of circuit diagram displayed)
• Blank or green raster. Flyback lines. Faint picture or normal picture. (with circuit diagram extract)
• Rolling or jittering picture. (part of circuit diagram displayed)
• LED does not flash. Slight buzz in appliance. (part of circuit diagram displayed)
• How to de-activate Hotel-Mode:
• Hums softly. (with circuit diagram extract)
• Line out of phase. Black band in centre of screen. No colour.
• Vertical line. on the right half screen. (picture attached)
• Dead, very slight whistle from PSU.
• Hotel mode.
• Secondary main power supply OK except +9V at 5.8V
• Excessive brightness.
• Dark picture. Audio OK .
• PSU does not start up, if appliance was switched off for a day. Appliance functions after short switch on/off. (picture attached)
• 10V on 95V line. (extract of circuit diagram attached)
• Tuning drifts. only on certain channels.
• Intermittent audio and picture. (with circuit diagram extract) (20GR1055 tips)
• Sound varies with picture content.
• Blank raster. No audio. after a while. (picture attached)
• Reluctant to start from cold (with circuit diagram extract)
• Bright flash on screen. No picture or sound. (extract of circuit diagram attached)
• Vertical collapse. (part of circuit diagram displayed)
• No picture (when cold).
• No OSD. Picture OK .
• Adjustment of +95V. (part of circuit diagram displayed)
• Trips. (picture attached)
• Unstable tuning.
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound.
• Noise in audio.
• No colour.
• Dead. (part of circuit diagram displayed)
• Enter service mode.
• Blown chopper. (picture attached)
• Memory loss. (+ extract of circuit diagram)
• Colour amplitude and phase adjustment procedure.
• LED flashes once, then gurgles. (picture attached)
• Programs and PP-settings cannot be changed. (20GR1055 tips)
• No start up. No standby. Attempts to start up, but fails.
• V-centre adjustment procedure.
• No switch on. Weak whistling noise from PSU. LED is OFF.
• Volume varies. depending on picture content. (part of circuit diagram displayed)
• Line output stage does not start up. (with circuit diagram extract)
• Poor synchronisation. (with circuit diagram extract)
• No functions. when cold. (PHILIPS - 20GR1055 information)
• Bell filter adjustment procedure.
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (part of circuit diagram displayed) (PHILIPS - 20GR1055 information)
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning.
• Line output transistor fails repeatedly. (+ extract of circuit diagram)
• Doesn't store stations correctly.
• No standby, humming and standby LED blinks.
• During picture changes sometimes a volume increase (plop) is heard. (part of circuit diagram displayed)
• Green picture with retrace lines. After a few restarts picture OK.
• Dead. Low level buzz from loudspeaker. (part of circuit diagram displayed)
• Intermittent colour.
• Difficult startup. Rattling sound from line output trafo.
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (picture attached)
• Tripping. (with circuit diagram extract) (20GR1055 tips)
• Picture appears slowly.
• LED switches on then off immediately.
• Intermittent green picture, channels cannot be programmed. (picture attached)
• +9V supply modification. (picture attached)
• To improve performance with prerecorded cassettes. (with circuit diagram extract)
• Turns on automatically. No RC or front panel controls.
• Unable to retune set or set analogue levels. Store-lock option may be on "Hotel mode".
• Picture is faint with hanover bars. (picture attached)
• No connection for headphone.
• Programme tuning difficulty, stations shifted on tuning bar. (picture attached)
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• Blank raster. OSD OK .
• CRT types.
• Does not start up at once from cold.
• How to reset microprocessor.
• Slow start-up.
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• Memory content dropout at positions 4 and 5.
• No picture. TXT OK . (picture attached)
• PSU check.
• Defective IC7103 SV-production. (extract of circuit diagram attached)
• Print with linearity coil pos. 5800.
• New infra red receiver.
• Drive for high voltage missing. (+ extract of circuit diagram)
• No audio.
• Initial volume level is higher than maximum Hotel mode setting.
• No function. When switching on with RC, standby LED lights up. (picture attached)
• Intermittently dead. after start-up.
• SOPS defective. (picture attached) (PHILIPS - 20GR1055 information)
• Field collapse normally with blank picture. (part of circuit diagram displayed)
• Blue picture. Coloured lines.
• Buzz in audio (intermittently). (extract of circuit diagram attached)
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (+ extract of circuit diagram) (20GR1055 PHILIPS repair tip)
• Identification coil adjustment.
• Production change to line drive. (with circuit diagram extract)
• Does not start. Slight buzzing in loudspeaker.
• Right side of picture discoloured.
• Defective purity.
• No start up from cold and humming.
• No line output stage. (extract of circuit diagram attached)
• Smeary, washed out picture with bent verticals. (extract of circuit diagram attached)
• Difficultly in tuning to correct position.
• Appliance can not be programmed. Search does not function. Only limited volume control.
• No HT from chopper circuit. (extract of circuit diagram attached)
• No colour.
• Green screen and at other times no tuning. (extract of circuit diagram attached)
• Replacing the EAROM. (with circuit diagram extract)
• Change of C2523.
• +B very high. (part of circuit diagram displayed)
• Picture shifted to the right. (extract of circuit diagram attached)
• Memory cannot be opened via "rhombus". Stored channels cannot be changed.
• Poor reproduction of copy protected tapes. (picture attached) (20GR1055 PHILIPS repair tip)
• Enable Hotel mode. Disable hotel mode. (20GR1055 tip from PHILIPS)
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• Search jumps on UHF.
• Dead. Only hum from speakers. (with circuit diagram extract)
• Loosing colour during play-back of a video tape. (picture attached)
• Picture shifted to the left. intermittently. Line tearing. intermittently. (+ extract of circuit diagram)
• Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel will not change. (+ extract of circuit diagram)
• Appliance does not function with standby light flashing. (service info for PHILIPS -20GR1055)
• Squealing from PSU.
• No start-up. intermittently. (service info for PHILIPS -20GR1055)
• No function. Standby LED flashes briefly. (extract of circuit diagram attached)
• Picture is mostly green with flyback lines after 10 secs from switch on.
• No sound or picture. Low hum from speaker. (part of circuit diagram displayed)
• No tuning. only on certain channels.
• Height excessive. Defective linearity. Field blanking. (extract of circuit diagram attached)
• Stored channels are partially lost.
• Dim picture with Hanover bars.
• No picture, only squeaks for a short time at switch on then no more functions.
• Does not switch on, standby LED OK.
• Dead when switched on via mains switch. Though appliance is on, red LED flashes. Can be switched over to standby. If left in standby for 1 hour and then switched on via RC, functions.
• Tuning menu can not be called. All other functions OK.
• Vertical roll. (extract of circuit diagram attached)
• Green screen with flyback line. No picture. OSD OK.
• Picture shifts. (with circuit diagram extract)
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (extract of circuit diagram attached)
• No voltage from PSU. (+ extract of circuit diagram)
• No picture. Audio OK .
• No functions, hum in loudspeakers. (extract of circuit diagram attached)
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (extract of circuit diagram attached)
• No regulation. (part of circuit diagram displayed)
• Sound goes to max. intermittently and HT varies. (+ extract of circuit diagram)
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (picture attached)
• Noise in sound. Mute does not function.
• Dead. Strange noises from PSU/ line output transformer. (with circuit diagram extract)
• The TV cannot hold the picture.
• Tuning drifts. only on certain channels (after a while).
• To remove store/lock.
• Sound motorboating when cold. (+ extract of circuit diagram)
• Programming unoperational. Limited sound adjustment possible.
• Intermittent colour and intermittent dark vertical bar on picture.
• How to switch off Hotel-Mode:
• Initial volume level is higher than maximum Hotel mode setting.
• Volume can't be tuned down. No tuning with RC. (picture attached)
• Intermittently narrow picture, but corrects itself shortly after. (PHILIPS - 20GR1055 information)
• Enable Hotel mode.
• Colour disappears with VCR-scan (picture search). (part of circuit diagram displayed)
• Store lock on the appliance.
• Occasionally appliance does not switch on from standby. No further functions are possible.
• Colour flickers. No colour. after a while. (extract of circuit diagram attached)
• Buzzing sound then switches off.
• No picture. No sound. Switching on and off from Standby OK.
• Standby LED lights up and switches off at power on. Appliance will not start up.
• No audio.
• Slow start up of power supply. (extract of circuit diagram attached)
• No tuning or on screen tuning display.
• No colour.
• Unregulated power supply. Pulsating picture and surging sound. (with circuit diagram extract)
• Becomes defective immediately after switch on.
• No tuning. (+ extract of circuit diagram)
• "Store" key does not work. (+ extract of circuit diagram)
• Set goes accidentally into hotel mode.
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• Unstable tuning.
• Switches off by itself. after a while. (picture attached)
• High voltage transistor defective after a while.
• Only half a picture. (with circuit diagram extract)
• Reduced vertical size. at top.
• No picture. OSD OK .
• No line start up; +95 available; +9V is about 4.5V. (part of circuit diagram displayed)
• Difficult to tune programmes, stations shifted on tuning bar.
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (picture attached)
• Error codes.
• Control panel cover.
• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (part of circuit diagram displayed)
• Line output stage does not function.
• The fuse and the bridge diodes in the power supply blow.
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (with circuit diagram extract)
• Search jumps on UHF.
• The TV does not stop during the tuning phase.
• Line output transistor becomes warm and in the course of time it becomes defective. (with circuit diagram extract)
• Line output stage only starts up for a short time. (+ extract of circuit diagram)
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (extract of circuit diagram attached)
• To release hotel mode (child lock).
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• No frame or short frame. (+ extract of circuit diagram)
• R-Y and B-Y discriminator adjustment procedure. (part of circuit diagram displayed)
• When switching on, only a 10cm stripe on top of screen, the rest of screen is black with flyback lines. After a while, stripe becomes wider. (picture attached)
• Cannot be programmed and search does not function. Only limited volume adjustable.
• No voltage from PSU, computer does not work. (with circuit diagram extract)
• Dead. Low hum. (PHILIPS - 20GR1055 information)
• No channel search. No OSD. (extract of circuit diagram attached)
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• Error messages indicated by front display flashing. (part of circuit diagram displayed)
• Protection device (thyristor THY6641) is triggered at switch on. (with circuit diagram extract)
• Processor numbers (changed).
• No audio.
• PAL colour amplitude adjustment procedure.
• Green picture.
• No tuning.
• Colours flicker and disappears.
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (extract of circuit diagram attached)
• Hotel Mode activates by itself. (with circuit diagram extract) (20GR1055 tip from PHILIPS)
• Unstable tuning.
• Sound varies with picture content.
• Local controls inoperative.
• Dead. At switch on the stand by LED flashes.
• Vertical vibration in cold condition of set.
• Blank raster. Flyback lines. (extract of circuit diagram attached) (20GR1055 tips)
• Buzzing from PSU. when cold. (part of circuit diagram displayed)
• How to switch off Hotel-Mode.
• Picture only in two bars in upper screen section, the rest is dark. (picture attached)
• Unstable tuning.
• No function. Standby-LED lights up. Appliance switches on but no picture or sound.
• After operating for one hour it is no longer possible to switch over programmes not even from the front panel. Appliance must be switched on and off then it is possible to change channels.
• Set comes on in store lock mode. (extract of circuit diagram attached)
• No picture, sound ok but on turning up A1 control, frame collapse. (part of circuit diagram displayed)
• Dark picture.
• No sound. No picture. Faint motorboating noise.
• Picture fails for a short time. (part of circuit diagram displayed)
• Skips channels during tuning. (part of circuit diagram displayed)
• Low audio.
• Intermittent colour.
• Colours flickers and disappears.
• Loud chriping after switch on. It becomes lower after a short time.
• Low audio. (picture attached)
• Low frequency noise on sound.
• Service manual correction. (picture attached)
• Volume change with great fluctuations in brightness. (with circuit diagram extract)
• Wavy picture. on the right.
• No audio.
• Initial volume level is higher than maximum Hotel mode setting.
• Replacement of TDA7052 with a TDA7052A.
• The switched-mode power supply cannot be loaded.
• Green picture.
• Excessive HV. after a while.
• Green raster. Faint picture. Flyback lines.
• Red picture. Flyback lines.
• Stuck in standby. (picture attached)
• No colour in OSD.
• Search jumps on UHF.
• Reduced horizontal size. (with circuit diagram extract)
• Comes on for a short time.
• Random breakdown of line output transistor. (with circuit diagram extract)
• Line output transistor running hot. (picture attached)
• Sound returns gradually after channel change. (with circuit diagram extract)
• Cannot change tuning or stored settings. (with circuit diagram extract)
• Stations won't change. Picture and sound OK. Other functions OK.
• Buzz in audio. No picture.
• Picture shifted horizontally. (with circuit diagram extract)
• Power supply fault finding. (+ extract of circuit diagram)
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• Programme tuning difficulty. Stations has shifted on tuning bar.
• Microprocessor screening plate. (extract of circuit diagram attached)
• How to de-activate Hotel mode.
• Dead. Low frequency noise on sound.
• No start-up. Standby LED flashes .
• Excessive green.
• Crackling and popping in sound after a short time.
• Does not stop on stations.
• Connection of a loop system to the TV.
• No or intermittent start-up. (part of circuit diagram displayed)
• Line output stage TS7528 is defective. (with circuit diagram extract)
• No tuning possible, F2 appears on bottom of picture and S1 on top.
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again.
• Power supply does not oscillate. (picture attached)
• No horizontal synchronisation. (with circuit diagram extract)
• Modification at line transformer position 5530. (with circuit diagram extract)
• Appliance is dead with standby LED flashing after a few seconds. (extract of circuit diagram attached)
• Two lines going around. (+ extract of circuit diagram)
• After switching on the CTV "EXT...1.2.3..." appears on the screen. (service info for PHILIPS -20GR1055)
• No function at switch on from standby. Switches to LOCK (hotel) mode. (with circuit diagram extract)
• Standby just pulsing.
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink.
• Correction to service manual LOT winding.
• Hazy flickering picture at top. (with circuit diagram extract)
• Display goes to F1 a few seconds after switching the set on.
• White unmodulated raster. Picture missing. (part of circuit diagram displayed)
• Colours flickers and disappears.
• Right hand side of screen has a line.
• Strongly distorted sound by low volume.
• No picture. No audio. (with circuit diagram extract)
• Tuning drift, when it is hot the tuning is lost on channel change.
• No function, starts up from standby, then goes out.
• No freeze frame or intermittent freeze frame; no sound. (extract of circuit diagram attached)
• Bright flash on screen and no picture or sound after a few minutes. (extract of circuit diagram attached)
• Whistle.
• Excessive vertical size.
• Settings do not stay in position.
• No functions. Slow start-up. (part of circuit diagram displayed)
• No functions. Hum in loudspeaker. No LED lit.
• Delay RF AGC adjustment procedure.
• Skips channels during tuning. only on certain channels.
• No switch on. Low noise on sound. (with circuit diagram extract)
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• No output from the chopper power supply which uses a junction FET, whose gate and source are at 12V while 300V is present at the drain. (part of circuit diagram displayed)
• Sound varies with picture content.
• Does not regulate +95V.
• Chopper inoperative. (with circuit diagram extract)
• Dead due to action of over voltage protection circuit.
• No colour and vertical black bar across screen.
• No audio.
• Description of SMPS. (extract of circuit diagram attached)
• No HV.
• No picture. (with circuit diagram extract)
• Intermittent colour.
• Tuning procedure.
• How to enter/exit HOTEL mode.
• Horizontal white line.
• No audio.
• Picture is poor with rippling on verticals. (picture attached) (20GR1055 tip from PHILIPS)
• Modification introduced to +9V supply.
• No start-up. (with circuit diagram extract)
• Change of C2523.
• Slow hiccup (+ extract of circuit diagram)
• Horizontal hold adjustment procedure.
• Tuning drifts. (extract of circuit diagram attached)
• Excessive horizontal size.
• Intermittent destruction of line o/p transistor. (part of circuit diagram displayed)
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• No start-up. intermittently (when cold). (extract of circuit diagram attached)
• Stuck in hotel mode.
• No line output.
• Intermittently no picture and sound at switch on. Buzz from speaker. (part of circuit diagram displayed)
• Line tearing. on lower half screen. (extract of circuit diagram attached)
• Limited volume. No channel search.
• White balance adjustment.
• Volume goes to max. No volume control.
• Menu rolling. (part of circuit diagram displayed)
• Appliance hums slightly (no speaker) horizontal end stage and power supply transistor are ok. Unfortunately no service instructions available.
• Initial volume level is higher than maximum hotel mode setting.
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• No functions. Sound buzzes in loudspeaker. (with circuit diagram extract)
• Control micro processors.
• Using a lamp as a load.
• Whistling.
• Automatic fine tuning (AFT) field alignment procedure.
• No operation.
• New IR receiver.
• Change of C2523.
• Unable to tune or set volume in Prefix mode.
• Appliance will not switch on at times, but hums in the power supply section.
• Microcomputers and screening plate.
• Set dead with just 5V on the 95V line. Standby LED is on but set won't start. (part of circuit diagram displayed)
• Focus adjustment.
• Stops at start up. (+ extract of circuit diagram)
• PSU switches off with load at U95V. (extract of circuit diagram attached)
• No functions. Standby LED flashes. Relay switches to ON.
• PSU peeps +95 is ca 0,8v (20GR1055 tip from PHILIPS)
• Line output transistor replacement.
• Switches to standby. (+ extract of circuit diagram)
• Won't tune a new channel. Won't activate store function. Picture OK. Sound OK.
• The following production changes were introduced to prevent the set coming on in the store lock mode when switched on from standby. (with circuit diagram extract)
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels.
• How to de-activate volume limiter. (20GR1055 tip from PHILIPS)
• The remote control only controls the volume and sound-stop. No function with On-Off and channel change-over, although the display for the operation flickers.
• The removal of leaded diodes. (+ extract of circuit diagram) (20GR1055 PHILIPS repair tip)
• Dim picture with Hanover bars visible. (part of circuit diagram displayed) (service info for PHILIPS -20GR1055)
• No power supply start up in loaded condition (eg. with lamp).
• Replacement of surface mounted diode 6637. (extract of circuit diagram attached)
• 95V available. 9V is only 5.2V. Slight buzzing from loudspeakers.
• Sound varies with picture content.
• Picture separating line appears. Whistling.
• Picture centering has shifted horizontally. No OSD.
• Trips. at start-up (intermittently). (with circuit diagram extract)
• No start-up. when cold. (extract of circuit diagram attached) (20GR1055 tip from PHILIPS)
• No switch on after activating mains switch. Whistling noise. (part of circuit diagram displayed)
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes. (PHILIPS - 20GR1055 information)
• How to switch OFF Hotel-Mode.
• No functions. after start-up (intermittently).
• No picture and sound. Low hum intermittently, no function.
• Picture displays lines and strange foldover effect at centre.
• Does not shut down (when cold).
• No start up, just a buzzing noise in speakers. (picture attached)
• Bright picture. Flyback lines.
• Initial volume level is higher than maximum Hotel mode setting.
• Programme channel search cannot be called up.
• No +9V, line output stage is OK. (with circuit diagram extract)
• Quick hiccup. (picture attached)
• Searches for channels continuously. (picture attached)
• Lines on picture after approx one hour. It consists of a band of bright white lines about two inches wide. (with circuit diagram extract) (20GR1055 tips)
• Change of C2523.
• Picture passes out in the centre.
• How to de-activate Hotel-Mode.
• Colour sync adjustment procedure.
• The picture is slightly yellow, flyback lines. Slightly noisy, no own recording possible.
• Interference in audio. Interference in picture. (+ extract of circuit diagram)
• The tone (sound) tunes well, but the volume cannot be raised.
• No sound or raster. The 95V HT supply is present at the line output stage but there is no line drive. (with circuit diagram extract)
• No start-up. Buzzing from speakers and working noise of PSU. (20GR1055 tips)
• Streaks in picture. Picture pulls and rolls intermittently.
• 6613 type change. (extract of circuit diagram attached)
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (picture attached)
• No vertical deflection. (part of circuit diagram displayed)
• Reluctant to start up from cold.
• To put into hotel mode.
• Line transistor 7528 blows within 1 sec. (picture attached)
• No tuning - no channels.
• No SOP supply. (+ extract of circuit diagram)
• Line tearing, especially with bright scences. (with circuit diagram extract)
• No colour. (+ extract of circuit diagram)
• No tuning. No channel lock. (part of circuit diagram displayed)
• Humming, motor noise and other unusual noises. Normal picture.
• Line tearing and rope effect.
• Distorted audio.
• Vertical size varies. intermittently.
• Line output transistor TR7528 fails at switch on. (20GR1055 tips)
• Intermittently dead. (with circuit diagram extract)
• No audio.
• Buzzing.
• No transmitters to adjust and the sound is not controllable.