20GR105075R / PHILIPS [TV]

• Horizontal white line.
• 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.
• Height excessive. Defective linearity. Field blanking. (part of circuit diagram displayed)
• Tuning drifts. only on certain channels.
• No channel search. No OSD. (picture attached)
• Volume change with great fluctuations in brightness. (picture attached) (20GR105075R PHILIPS repair tip)
• Dead. At switch on the stand by LED flashes.
• Humming, motor noise and other unusual noises. Normal picture.
• Picture passes out in the centre.
• No picture. TXT OK . (with circuit diagram extract)
• Microcomputers and screening plate.
• No functions. Slow start-up. (picture attached)
• Stuck in hotel mode.
• How to de-activate Hotel-Mode.
• Enable Hotel mode.
• White unmodulated raster. Picture missing. (with circuit diagram extract)
• Adjustment of +95V. (with circuit diagram extract)
• 95V available. 9V is only 5.2V. Slight buzzing from loudspeakers.
• Intermittent colour.
• Unable to retune set or set analogue levels. Store-lock option may be on "Hotel mode".
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• Hums softly. (picture attached)
• Random breakdown of line output transistor. (+ extract of circuit diagram) (20GR105075R tip from PHILIPS)
• Picture is mostly green with flyback lines after 10 secs from switch on.
• Wavy picture. on the right.
• Skips channels during tuning. only on certain channels. (20GR105075R tip from PHILIPS)
• How to switch off Hotel-Mode.
• No function at switch on from standby. Switches to LOCK (hotel) mode. (with circuit diagram extract)
• No colour and vertical black bar across screen.
• Replacement of surface mounted diode 6637. (+ extract of circuit diagram)
• Line output stage does not start up. (+ extract of circuit diagram)
• Picture displays lines and strange foldover effect at centre.
• Appliance hums slightly (no speaker) horizontal end stage and power supply transistor are ok. Unfortunately no service instructions available.
• No picture. OSD OK .
• Power supply fault finding. (extract of circuit diagram attached)
• Vertical line. on the right half screen. (part of circuit diagram displayed)
• No regulation. (picture attached)
• Colours flickers and disappears.
• Searches for channels continuously. (with circuit diagram extract)
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• Sound varies with picture content.
• How to switch OFF Hotel-Mode.
• No HT from chopper circuit. (+ extract of circuit diagram)
• Picture fails for a short time. (part of circuit diagram displayed)
• Line tearing, especially with bright scences. (extract of circuit diagram attached)
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (extract of circuit diagram attached)
• Search jumps on UHF.
• No functions. after start-up (intermittently).
• Tuning drift, when it is hot the tuning is lost on channel change.
• 10V on 95V line. (part of circuit diagram displayed) (20GR105075R tip from PHILIPS)
• Picture separating line appears. Whistling.
• Buzzing.
• No voltage from PSU, computer does not work. (extract of circuit diagram attached)
• Distorted audio.
• Turns on automatically. No RC or front panel controls.
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (part of circuit diagram displayed) (20GR105075R PHILIPS repair tip)
• No start-up. (+ extract of circuit diagram)
• Tuning drifts. (part of circuit diagram displayed)
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (extract of circuit diagram attached)
• Streaks in picture. Picture pulls and rolls intermittently.
• No start up. No standby. Attempts to start up, but fails.
• Interference in audio. Interference in picture. (picture attached)
• Control panel cover.
• Memory content dropout at positions 4 and 5.
• Limited volume. No channel search.
• Reduced vertical size. at top.
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (+ extract of circuit diagram)
• Print with linearity coil pos. 5800.
• Production change to line drive. (+ extract of circuit diagram) (PHILIPS - 20GR105075R information)
• 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)
• U743 tuner replacement. (part of circuit diagram displayed)
• Vertical roll. (picture attached)
• Picture is faint with hanover bars. (picture attached)
• Sound varies with picture content.
• Loud chriping after switch on. It becomes lower after a short time. (20GR105075R tip from PHILIPS)
• Blank raster. OSD OK .
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• After working normally for a while the TV blocks in any position. The functions do not work. (20GR105075R tip from PHILIPS)
• The switched-mode power supply cannot be loaded. (PHILIPS - 20GR105075R information)
• Sound increases intermittently or "pops", especially during bright scenes. (+ extract of circuit diagram)
• Does not switch on, standby LED OK. (service info for PHILIPS -20GR105075R)
• Memory loss. (+ extract of circuit diagram) (PHILIPS - 20GR105075R information)
• No operation.
• Sound varies with picture content.
• Dark picture.
• Enter service mode.
• No tuning possible, F2 appears on bottom of picture and S1 on top.
• Occasionally appliance does not switch on from standby. No further functions are possible.
• Line output transistor fails repeatedly. (+ extract of circuit diagram)
• No functions. when cold.
• R-Y and B-Y discriminator adjustment procedure. (+ extract of circuit diagram)
• How to de-activate Hotel-Mode:
• Line output stage does not function.
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (part of circuit diagram displayed)
• No audio.
• Control micro processors.
• Dead. (extract of circuit diagram attached)
• Hotel mode.
• Search jumps on UHF.
• SIF DET adjustment procedure.
• Whistling.
• How to enter/exit HOTEL mode.
• No tuning.
• The removal of leaded diodes. (extract of circuit diagram attached)
• Initial volume level is higher than maximum hotel mode setting. (20GR105075R tip from PHILIPS)
• No +9V, line output stage is OK. (picture attached)
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• Low audio.
• Colour sync adjustment procedure.
• Won't tune a new channel. Won't activate store function. Picture OK. Sound OK.
• Red picture. Flyback lines.
• Blank raster. No audio. after a while. (extract of circuit diagram attached)
• Dim picture with Hanover bars visible. (picture attached)
• No colour.
• Programs and PP-settings cannot be changed.
• Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel will not change. (with circuit diagram extract) (20GR105075R tips)
• Service manual correction. (+ extract of circuit diagram)
• Failures in the power supply. (+ extract of circuit diagram)
• No line start up; +95 available; +9V is about 4.5V. (extract of circuit diagram attached)
• No tuning bar when install button pressed and set not in hotel mode. (+ extract of circuit diagram)
• Change of C2523.
• Picture only in two bars in upper screen section, the rest is dark. (extract of circuit diagram attached)
• Crackling and popping in sound after a short time. (20GR105075R PHILIPS repair tip)
• No switch on. Weak whistling noise from PSU. LED is OFF.
• Poor synchronisation. (with circuit diagram extract)
• High voltage transistor defective after a while.
• New infra red receiver.
• No or intermittent start-up. (picture attached)
• No tuning. No channel lock. (part of circuit diagram displayed)
• Strongly distorted sound by low volume.
• Horizontal hold adjustment procedure.
• No audio.
• Smeary, washed out picture with bent verticals. (picture attached)
• The TV cannot hold the picture.
• Skips channels during tuning. (extract of circuit diagram attached)
• Lines across top of picture about 8" in first 100 lines. (with circuit diagram extract)
• How to switch off Hotel-Mode:
• Line output transistor running hot. (with circuit diagram extract)
• Hazy flickering picture at top. (part of circuit diagram displayed)
• Initial volume level is higher than maximum Hotel mode setting.
• No tuning. (with circuit diagram extract)
• Microprocessor screening plate. (+ extract of circuit diagram)
• Dead. Low level buzz from loudspeaker. (extract of circuit diagram attached)
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• Bright flash on screen. No picture or sound. (+ extract of circuit diagram)
• PAL colour amplitude adjustment procedure. (20GR105075R tips)
• Using a lamp as a load.
• Two lines going around. (part of circuit diagram displayed)
• No colour. (picture attached)
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning.
• Identification coil adjustment.
• No line output stage. (part of circuit diagram displayed)
• Whistle.
• Intermittent colour and intermittent dark vertical bar on picture.
• Appliance is dead with standby LED flashing after a few seconds. (with circuit diagram extract)
• No picture. No sound. Switching on and off from Standby OK.
• Intermittently narrow picture, but corrects itself shortly after.
• Dead due to action of over voltage protection circuit.
• Stops at start up. (+ extract of circuit diagram)
• 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.
• No start-up. when cold. (with circuit diagram extract)
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• Unregulated power supply. Pulsating picture and surging sound. (extract of circuit diagram attached)
• Standby just pulsing.
• No tuning. only on certain channels.
• Buzzing from PSU. when cold. (part of circuit diagram displayed)
• Green picture.
• V-centre adjustment procedure.
• No colour in OSD.
• No functions. Hum in loudspeaker. No LED lit.
• Change of C2523.
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• No horizontal synchronisation. (with circuit diagram extract)
• Colour amplitude and phase adjustment procedure.
• Programme tuning difficulty. Stations has shifted on tuning bar.
• Green screen and at other times no tuning. (with circuit diagram extract)
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink.
• Only half a picture. (picture attached)
• No picture. (extract of circuit diagram attached)
• Appliance does not function with standby light flashing.
• No audio.
• No audio.
• The following production changes were introduced to prevent the set coming on in the store lock mode when switched on from standby. (extract of circuit diagram attached)
• To improve performance with prerecorded cassettes. (part of circuit diagram displayed)
• Poor reproduction of copy protected tapes. (+ extract of circuit diagram)
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• Replacing the EAROM. (picture attached)
• Dead, very slight whistle from PSU. (20GR105075R tip from PHILIPS)
• Initial volume level is higher than maximum Hotel mode setting.
• Appliance can not be programmed. Search does not function. Only limited volume control.
• Standby LED lights up and switches off at power on. Appliance will not start up.
• No picture. No sound. Purring sound in loudspeaker. (extract of circuit diagram attached)
• Does not stop on stations.
• Low 5V to micro chip. (extract of circuit diagram attached)
• How to de-activate volume limiter.
• Programme channel search cannot be called up. (20GR105075R PHILIPS repair tip)
• +9V supply modification. (part of circuit diagram displayed)
• Buzz in audio. No picture.
• Trips. (extract of circuit diagram attached)
• Intermittent colour.
• No picture. No audio. (extract of circuit diagram attached)
• No function. When switching on with RC, standby LED lights up. (+ extract of circuit diagram)
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (part of circuit diagram displayed)
• Dead. Strange noises from PSU/ line output transformer. (picture attached)
• No tuning or on screen tuning display.
• No colour.
• The fuse and the bridge diodes in the power supply blow.
• Line tearing. on lower half screen. (with circuit diagram extract)
• Blue picture. Coloured lines. (service info for PHILIPS -20GR105075R)
• Green picture. (extract of circuit diagram attached)
• Green raster. Faint picture. Flyback lines.
• Appliance will not switch on at times, but hums in the power supply section.
• Bright flash on screen and no picture or sound after a few minutes. (with circuit diagram extract)
• Stations won't change. Picture and sound OK. Other functions OK.
• No function. Standby LED flashes briefly. (part of circuit diagram displayed)
• Delay RF AGC adjustment procedure.
• No start-up. Standby LED flashes .
• No picture, sound ok but on turning up A1 control, frame collapse. (+ extract of circuit diagram)
• No SOP supply. (extract of circuit diagram attached)
• Modification at line transformer position 5530. (+ extract of circuit diagram) (20GR105075R tips)
• Intermittent colour.
• Dead. Only hum from speakers. (extract of circuit diagram attached)
• Unstable tuning.
• No line output.
• To release hotel mode (child lock).
• Description of SMPS. (+ extract of circuit diagram)
• Intermittently dead. (extract of circuit diagram attached)
• No tuning, no remote volume control. (picture attached)
• Dead with whistling noise coming from power supply. (picture attached)
• Error messages indicated by front display flashing. (extract of circuit diagram attached)
• Set goes accidentally into hotel mode.
• No power supply start up in loaded condition (eg. with lamp).
• To put into hotel mode.
• Excessive HV. after a while.
• Tuning procedure.
• Stuck in standby. (+ extract of circuit diagram)
• Whistling from PSU. (picture attached)
• Protection device (thyristor THY6641) is triggered at switch on. (with circuit diagram extract)
• PSU check.
• Dark picture. Audio OK .
• No vertical deflection. (picture attached)
• Search jumps on UHF. (20GR105075R tip from PHILIPS)
• Picture is poor with rippling on verticals. (picture attached)
• Set dead with just 5V on the 95V line. Standby LED is on but set won't start. (with circuit diagram extract)
• Difficult to tune programmes, stations shifted on tuning bar.
• No functions. Sound buzzes in loudspeaker. (with circuit diagram extract)
• Intermittently no picture and sound at switch on. Buzz from speaker. (picture attached)
• Does not shut down (when cold).
• Trips. at start-up (intermittently). (picture attached)
• Intermittent audio and picture. (with circuit diagram extract)
• Tripping. (part of circuit diagram displayed)
• Does not regulate +95V.
• White balance adjustment.
• No function. Standby-LED lights up. Appliance switches on but no picture or sound.
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• Colours flickers and disappears.
• Does not start up at once from cold.
• Hotel Mode activates by itself. (extract of circuit diagram attached)
• Automatic fine tuning (AFT) field alignment procedure.
• Sound motorboating when cold. (with circuit diagram extract)
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (picture attached) (20GR105075R PHILIPS repair tip)
• Volume goes to max. No volume control.
• Comes on for a short time.
• Buzzing sound then switches off.
• 6613 type change. (picture attached)
• Sound goes to max. intermittently and HT varies. (picture attached)
• Error codes.
• Lines on picture after approx one hour. It consists of a band of bright white lines about two inches wide. (part of circuit diagram displayed)
• Switches to standby. (extract of circuit diagram attached)
• No audio. (PHILIPS - 20GR105075R information)
• Buzz in audio (intermittently). (part of circuit diagram displayed)
• 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. (with circuit diagram extract)
• Chopper inoperative. (picture attached)
• No start up from cold and humming.
• Line output transistor TR7528 fails at switch on.
• Low audio. (part of circuit diagram displayed)
• Difficult startup. Rattling sound from line output trafo.
• Cannot be programmed and search does not function. Only limited volume adjustable.
• Replacement of TDA7052 with a TDA7052A.
• No sound or picture. Low hum from speaker. (with circuit diagram extract)
• Power supply does not oscillate. (with circuit diagram extract)
• Vertical collapse. (extract of circuit diagram attached) (20GR105075R tip from PHILIPS)
• Line output stage only starts up for a short time. (extract of circuit diagram attached)
• No power with abnormal sound. (with circuit diagram extract)
• Vertical oscillator adjustment procedure. (service info for PHILIPS -20GR105075R)
• No audio.
• Intermittent destruction of line o/p transistor. (picture attached)
• Change of C2523. (service info for PHILIPS -20GR105075R)
• No function, starts up from standby, then goes out. (20GR105075R PHILIPS repair tip)
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• Rolling or jittering picture. (part of circuit diagram displayed) (20GR105075R tips)
• Defective purity.
• Change of C2523.
• Cannot change tuning or stored settings. (with circuit diagram extract)
• PSU peeps +95 is ca 0,8v
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (with circuit diagram extract)
• SOPS defective. (+ extract of circuit diagram) (PHILIPS - 20GR105075R information)
• How to reset microprocessor.
• Line transistor 7528 blows within 1 sec. (+ extract of circuit diagram) (20GR105075R PHILIPS repair tip)
• Green screen with flyback line. No picture. OSD OK.
• Picture shifted horizontally. (with circuit diagram extract)
• Sound returns gradually after channel change. (extract of circuit diagram attached)
• LED flashes once, then gurgles. (extract of circuit diagram attached)
• No switch on. Low noise on sound. (picture attached)
• Display goes to F1 a few seconds after switching the set on.
• Becomes defective immediately after switch on.
• +B very high. (picture attached)
• Blown chopper. (with circuit diagram extract)
• No start-up. Buzzing from speakers and working noise of PSU.
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (+ extract of circuit diagram)
• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (picture attached)
• Volume can't be tuned down. No tuning with RC. (with circuit diagram extract)
• Quick hiccup. (picture attached)
• Programme tuning difficulty, stations shifted on tuning bar. (+ extract of circuit diagram) (20GR105075R tips)
• No functions. Standby LED flashes. Relay switches to ON.
• Secondary main power supply OK except +9V at 5.8V (20GR105075R PHILIPS repair tip)
• Right side of picture discoloured.
• No OSD. Picture OK . (service info for PHILIPS -20GR105075R)
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound.
• Blank raster. Flyback lines. (picture attached)
• Excessive brightness.
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (part of circuit diagram displayed)
• Change of C2523.
• No start-up. intermittently (when cold). (picture attached)
• Defective IC7103 SV-production. (picture attached)
• No picture (when cold).
• No tuning - no channels.
• Processor numbers (changed).
• Focus adjustment.
• Does not start. Slight buzzing in loudspeaker.
• Correction to service manual LOT winding. (service info for PHILIPS -20GR105075R)
• Poor synchronisation. when cold. (picture attached)
• Slow start up of power supply. (picture attached)
• Line down middle of screen. (extract of circuit diagram attached)
• Unstable tuning.
• After switching on the CTV "EXT...1.2.3..." appears on the screen.
• Modification introduced to +9V supply.
• Colour flickers. No colour. after a while. (picture attached)
• Slow hiccup (part of circuit diagram displayed)
• Vertical size varies. intermittently.
• Volume varies. depending on picture content. (with circuit diagram extract) (20GR105075R tip from PHILIPS)
• New IR receiver.
• Line out of phase. Black band in centre of screen. No colour.
• No sound. No picture. Faint motorboating noise.
• Sound varies with picture content.
• "Store" key does not work. (+ extract of circuit diagram)
• Slow start-up.
• Initial volume level is higher than maximum Hotel mode setting.
• Menu rolling. (picture attached)
• Picture shifts. (extract of circuit diagram attached)
• Squealing from PSU.
• Excessive green.
• LED does not flash. Slight buzz in appliance. (with circuit diagram extract)
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (picture attached)
• Bright picture. Flyback lines.
• Picture shifted to the right. (with circuit diagram extract)
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (with circuit diagram extract)
• Drive for high voltage missing. (extract of circuit diagram attached)
• The TV does not stop during the tuning phase.
• Connection of a loop system to the TV.
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (extract of circuit diagram attached)
• Tuning menu can not be called. All other functions OK.
• No sound or raster. The 95V HT supply is present at the line output stage but there is no line drive. (part of circuit diagram displayed)
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again.
• Excessive vertical size.
• Colours flicker and disappears. (20GR105075R PHILIPS repair tip)
• Reduced horizontal size. (part of circuit diagram displayed)
• Initial volume level is higher than maximum Hotel mode setting.
• Settings do not stay in position.
• Poor sync. AGC fault.
• Line tearing and rope effect.
• No transmitters to adjust and the sound is not controllable.
• Memory cannot be opened via "rhombus". Stored channels cannot be changed.
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes.
• Line output transistor replacement.
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels.
• Blank or green raster. Flyback lines. Faint picture or normal picture. (extract of circuit diagram attached) (20GR105075R tip from PHILIPS)
• Line output stage TS7528 is defective. (extract of circuit diagram attached)
• Store lock on the appliance.
• Unstable tuning.
• Right hand side of screen has a line.
• No audio.
• During picture changes sometimes a volume increase (plop) is heard. (+ extract of circuit diagram)
• Horizontal oscillator adjustment procedure.
• Local controls inoperative.
• To remove store/lock.
• How to de-activate Hotel mode.
• Dim picture with Hanover bars.
• Intermittently dead. after start-up.
• Difficultly in tuning to correct position.
• No voltage from PSU. (picture attached)
• Stored channels are partially lost.
• No colour.
• 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.
• Noise in audio.
• Dead. Low hum. (PHILIPS - 20GR105075R information)
• Vertical vibration in cold condition of set.
• No functions, hum in loudspeakers. (+ extract of circuit diagram)
• No standby, humming and standby LED blinks.
• Set does not retune or program etc
• Low frequency noise on sound.
• CRT types.
• Tuning drifts. only on certain channels (after a while).
• PSU switches off with load at U95V. (+ extract of circuit diagram)
• Colour disappears with VCR-scan (picture search). (picture attached)
• No freeze frame or intermittent freeze frame; no sound. (+ extract of circuit diagram)
• Dead. Low frequency noise on sound.
• Reluctant to start up from cold.
• No start-up. intermittently.
• Intermittent green picture, channels cannot be programmed. (with circuit diagram extract)
• Unstable tuning. (PHILIPS - 20GR105075R information)
• No HV.
• Dead set. Tries to start.
• No picture. Audio OK .
• Excessive horizontal size.
• Loosing colour during play-back of a video tape. (picture attached)
• LED switches on then off immediately.
• Picture shifted to the left. intermittently. Line tearing. intermittently. (extract of circuit diagram attached)
• No frame or short frame. (extract of circuit diagram attached)
• Field collapse normally with blank picture. (with circuit diagram extract)
• Doesn't store stations correctly.
• Line output transistor becomes warm and in the course of time it becomes defective. (with circuit diagram extract)
• The tone (sound) tunes well, but the volume cannot be raised.
• Set comes on in store lock mode. (with circuit diagram extract)
• Green picture.
• No start up, just a buzzing noise in speakers. (with circuit diagram extract)
• Unable to tune or set volume in Prefix mode.
• Reluctant to start from cold (extract of circuit diagram attached)
• Picture centering has shifted horizontally. No OSD.
• Programming unoperational. Limited sound adjustment possible.
• Bell filter adjustment procedure.
• Green picture with retrace lines. After a few restarts picture OK.
• No connection for headphone.
• Noise in sound. Mute does not function.
• PSU does not start up, if appliance was switched off for a day. Appliance functions after short switch on/off. (extract of circuit diagram attached)
• No picture and sound. Low hum intermittently, no function.
• Switches off by itself. after a while. (part of circuit diagram displayed)
• No switch on after activating mains switch. Whistling noise. (part of circuit diagram displayed)
• Picture appears slowly.
• Enable Hotel mode. Disable hotel mode.