20GR105266B / PHILIPS [TV 51 (47/48) cm picture]

• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (picture attached)
• Appliance will not switch on at times, but hums in the power supply section.
• Colours flickers and disappears.
• No vertical deflection. (with circuit diagram extract)
• Green raster. Faint picture. Flyback lines.
• No functions. Hum in loudspeaker. No LED lit.
• Excessive brightness.
• Colour flickers. No colour. after a while. (extract of circuit diagram attached)
• Set comes on in store lock mode. (extract of circuit diagram attached)
• How to de-activate volume limiter.
• Poor synchronisation. (extract of circuit diagram attached)
• No start up from cold and humming.
• Does not start. Slight buzzing in loudspeaker.
• No start-up. intermittently.
• Line output transistor replacement.
• No tuning bar when install button pressed and set not in hotel mode. (picture attached)
• Bright picture. Flyback lines.
• Difficultly in tuning to correct position.
• Blank or green raster. Flyback lines. Faint picture or normal picture. (part of circuit diagram displayed)
• Blank raster. No audio. after a while. (extract of circuit diagram attached)
• Enter service mode.
• No tuning possible, F2 appears on bottom of picture and S1 on top.
• 95V available. 9V is only 5.2V. Slight buzzing from loudspeakers.
• Settings do not stay in position.
• No picture. No sound. Purring sound in loudspeaker. (with circuit diagram extract)
• Limited volume. No channel search.
• Tuning drift, when it is hot the tuning is lost on channel change.
• Lines on picture after approx one hour. It consists of a band of bright white lines about two inches wide. (with circuit diagram extract)
• +B very high. (with circuit diagram extract)
• Picture centering has shifted horizontally. No OSD.
• Line out of phase. Black band in centre of screen. No colour.
• Error codes.
• Line tearing, especially with bright scences. (part of circuit diagram displayed)
• Picture is mostly green with flyback lines after 10 secs from switch on.
• Microprocessor screening plate. (picture attached)
• Strongly distorted sound by low volume.
• PSU peeps +95 is ca 0,8v
• Green picture.
• Only half a picture. (+ extract of circuit diagram)
• Poor synchronisation. when cold. (extract of circuit diagram attached)
• Defective IC7103 SV-production. (with circuit diagram extract)
• Intermittently narrow picture, but corrects itself shortly after.
• Failures in the power supply. (extract of circuit diagram attached) (service info for PHILIPS -20GR105266B)
• Picture shifted horizontally. (with circuit diagram extract)
• LED flashes once, then gurgles. (part of circuit diagram displayed)
• Change of C2523.
• No start up. No standby. Attempts to start up, but fails.
• Unstable tuning.
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound.
• Bright flash on screen. No picture or sound. (extract of circuit diagram attached)
• Blank raster. OSD OK .
• Intermittent colour.
• Search jumps on UHF.
• No picture (when cold).
• Hazy flickering picture at top. (with circuit diagram extract)
• Chopper inoperative. (+ extract of circuit diagram)
• Dead. (picture attached)
• 6613 type change. (with circuit diagram extract)
• Stored channels are partially lost.
• Appliance hums slightly (no speaker) horizontal end stage and power supply transistor are ok. Unfortunately no service instructions available.
• Dead. Low level buzz from loudspeaker. (+ extract of circuit diagram)
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (picture attached)
• Green picture.
• Vertical roll. (picture attached)
• Line output stage only starts up for a short time. (+ extract of circuit diagram)
• White unmodulated raster. Picture missing. (part of circuit diagram displayed)
• No start-up. (part of circuit diagram displayed) (PHILIPS - 20GR105266B information)
• Dead set. Tries to start.
• Unstable tuning.
• No power with abnormal sound. (picture attached)
• No audio.
• No sound or picture. Low hum from speaker. (+ extract of circuit diagram)
• Line tearing and rope effect.
• Change of C2523.
• Reluctant to start up from cold.
• Sound goes to max. intermittently and HT varies. (extract of circuit diagram attached)
• Horizontal hold adjustment procedure.
• No picture. Audio OK .
• Power supply fault finding. (+ extract of circuit diagram)
• Protection device (thyristor THY6641) is triggered at switch on. (+ extract of circuit diagram)
• Modification introduced to +9V supply.
• The TV does not stop during the tuning phase.
• Sound varies with picture content.
• Picture separating line appears. Whistling.
• Initial volume level is higher than maximum Hotel mode setting.
• Print with linearity coil pos. 5800.
• Noise in audio.
• Dead. Strange noises from PSU/ line output transformer. (+ extract of circuit diagram)
• Dead due to action of over voltage protection circuit.
• Connection of a loop system to the TV.
• Line tearing. on lower half screen. (extract of circuit diagram attached)
• Dead. Low frequency noise on sound.
• Unstable tuning. (service info for PHILIPS -20GR105266B)
• No functions. Standby LED flashes. Relay switches to ON.
• Does not shut down (when cold).
• No line start up; +95 available; +9V is about 4.5V. (with circuit diagram extract)
• 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.
• SOPS defective. (extract of circuit diagram attached)
• No function. Standby LED flashes briefly. (part of circuit diagram displayed)
• Appliance can not be programmed. Search does not function. Only limited volume control.
• Stations won't change. Picture and sound OK. Other functions OK.
• No colour in OSD.
• Production change to line drive. (with circuit diagram extract)
• SIF DET adjustment procedure.
• Cannot change tuning or stored settings. (+ extract of circuit diagram)
• Line output stage does not function.
• No +9V, line output stage is OK. (with circuit diagram extract) (service info for PHILIPS -20GR105266B)
• Picture is faint with hanover bars. (+ extract of circuit diagram)
• Replacement of TDA7052 with a TDA7052A.
• Low audio. (extract of circuit diagram attached)
• Blue picture. Coloured lines.
• Hotel mode.
• Change of C2523.
• Streaks in picture. Picture pulls and rolls intermittently.
• No line output stage. (+ extract of circuit diagram) (20GR105266B PHILIPS repair tip)
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (with circuit diagram extract)
• Dead with whistling noise coming from power supply. (with circuit diagram extract)
• No switch on. Weak whistling noise from PSU. LED is OFF.
• Identification coil adjustment.
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (+ extract of circuit diagram)
• No colour.
• Automatic fine tuning (AFT) field alignment procedure.
• PSU switches off with load at U95V. (with circuit diagram extract)
• No function. Standby-LED lights up. Appliance switches on but no picture or sound. (20GR105266B tip from PHILIPS)
• No sound. No picture. Faint motorboating noise.
• No function. When switching on with RC, standby LED lights up. (with circuit diagram extract)
• Reduced horizontal size. (+ extract of circuit diagram)
• No audio.
• Microcomputers and screening plate.
• Description of SMPS. (part of circuit diagram displayed)
• Picture shifts. (with circuit diagram extract)
• Slow hiccup (+ extract of circuit diagram)
• Sound varies with picture content.
• No audio.
• Blank raster. Flyback lines. (extract of circuit diagram attached)
• Quick hiccup. (with circuit diagram extract)
• No connection for headphone.
• Defective purity.
• Switches off by itself. after a while. (extract of circuit diagram attached)
• New IR receiver.
• Vertical size varies. intermittently.
• No audio.
• Whistling from PSU. (part of circuit diagram displayed)
• No functions. after start-up (intermittently).
• No functions. when cold.
• LED switches on then off immediately.
• Drive for high voltage missing. (with circuit diagram extract) (service info for PHILIPS -20GR105266B)
• No functions. Slow start-up. (with circuit diagram extract)
• Intermittent green picture, channels cannot be programmed. (with circuit diagram extract)
• Modification at line transformer position 5530. (extract of circuit diagram attached)
• To remove store/lock.
• No regulation. (extract of circuit diagram attached)
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• No tuning. No channel lock. (part of circuit diagram displayed)
• Comes on for a short time.
• Distorted audio.
• Delay RF AGC adjustment procedure. (20GR105266B PHILIPS repair tip)
• Dim picture with Hanover bars visible. (+ extract of circuit diagram)
• No voltage from PSU, computer does not work. (picture attached)
• Sound motorboating when cold. (+ extract of circuit diagram)
• Volume varies. depending on picture content. (picture attached) (20GR105266B tip from PHILIPS)
• Excessive vertical size.
• No functions. Sound buzzes in loudspeaker. (extract of circuit diagram attached)
• Search jumps on UHF.
• Intermittent colour.
• Sound returns gradually after channel change. (+ extract of circuit diagram)
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• To improve performance with prerecorded cassettes. (extract of circuit diagram attached)
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (+ extract of circuit diagram)
• Memory cannot be opened via "rhombus". Stored channels cannot be changed.
• Picture only in two bars in upper screen section, the rest is dark. (picture attached)
• No SOP supply. (extract of circuit diagram attached)
• Set dead with just 5V on the 95V line. Standby LED is on but set won't start. (+ extract of circuit diagram) (service info for PHILIPS -20GR105266B)
• Replacing the EAROM. (picture attached)
• Whistle. (PHILIPS - 20GR105266B information)
• Line output transistor TR7528 fails at switch on.
• Excessive horizontal size.
• No tuning.
• How to enter/exit HOTEL mode.
• Colour amplitude and phase adjustment procedure. (service info for PHILIPS -20GR105266B)
• No or intermittent start-up. (with circuit diagram extract) (PHILIPS - 20GR105266B information)
• How to de-activate Hotel-Mode:
• Intermittently dead. after start-up.
• Secondary main power supply OK except +9V at 5.8V
• After switching on the CTV "EXT...1.2.3..." appears on the screen.
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes.
• +9V supply modification. (part of circuit diagram displayed)
• Smeary, washed out picture with bent verticals. (extract of circuit diagram attached)
• No power supply start up in loaded condition (eg. with lamp).
• No operation.
• Does not switch on, standby LED OK.
• Green screen and at other times no tuning. (+ extract of circuit diagram)
• Initial volume level is higher than maximum Hotel mode setting.
• No freeze frame or intermittent freeze frame; no sound. (picture attached)
• Loud chriping after switch on. It becomes lower after a short time. (service info for PHILIPS -20GR105266B)
• PSU check.
• V-centre adjustment procedure.
• Crackling and popping in sound after a short time.
• No line output.
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning.
• No switch on. Low noise on sound. (+ extract of circuit diagram)
• The following production changes were introduced to prevent the set coming on in the store lock mode when switched on from standby. (part of circuit diagram displayed)
• Colours flickers and disappears.
• How to switch OFF Hotel-Mode.
• Skips channels during tuning. (part of circuit diagram displayed)
• Initial volume level is higher than maximum hotel mode setting.
• No picture. OSD OK .
• To put into hotel mode.
• Dark picture.
• Excessive green. (PHILIPS - 20GR105266B information)
• Becomes defective immediately after switch on.
• Memory loss. (part of circuit diagram displayed)
• Does not stop on stations. (service info for PHILIPS -20GR105266B)
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (with circuit diagram extract)
• PAL colour amplitude adjustment procedure.
• Volume goes to max. No volume control.
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (+ extract of circuit diagram)
• Picture is poor with rippling on verticals. (picture attached)
• 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.
• Buzzing from PSU. when cold. (part of circuit diagram displayed)
• Doesn't store stations correctly.
• No frame or short frame. (part of circuit diagram displayed)
• Line output stage does not start up. (part of circuit diagram displayed)
• Trips. at start-up (intermittently). (part of circuit diagram displayed)
• Control panel cover.
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (with circuit diagram extract)
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• No audio.
• Intermittent audio and picture. (extract of circuit diagram attached)
• Difficult to tune programmes, stations shifted on tuning bar.
• Green picture. (picture attached)
• During picture changes sometimes a volume increase (plop) is heard. (extract of circuit diagram attached)
• Blown chopper. (picture attached)
• Does not regulate +95V. (PHILIPS - 20GR105266B information)
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels.
• Searches for channels continuously. (picture attached)
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (extract of circuit diagram attached)
• Tuning menu can not be called. All other functions OK.
• Slow start up of power supply. (picture attached)
• After working normally for a while the TV blocks in any position. The functions do not work.
• The tone (sound) tunes well, but the volume cannot be raised.
• U743 tuner replacement. (with circuit diagram extract)
• Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel will not change. (extract of circuit diagram attached)
• Low frequency noise on sound.
• Programming unoperational. Limited sound adjustment possible.
• Control micro processors.
• Occasionally appliance does not switch on from standby. No further functions are possible.
• No tuning. only on certain channels.
• High voltage transistor defective after a while.
• Display goes to F1 a few seconds after switching the set on.
• Picture shifted to the right. (with circuit diagram extract)
• 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)
• Stuck in hotel mode.
• Tuning drifts. (part of circuit diagram displayed)
• Cannot be programmed and search does not function. Only limited volume adjustable.
• Dead. Low hum.
• Stuck in standby. (with circuit diagram extract)
• Enable Hotel mode. Disable hotel mode.
• No voltage from PSU. (+ extract of circuit diagram)
• Buzz in audio. No picture.
• Search jumps on UHF.
• Low 5V to micro chip. (+ extract of circuit diagram)
• Replacement of surface mounted diode 6637. (+ extract of circuit diagram)
• Bright flash on screen and no picture or sound after a few minutes. (extract of circuit diagram attached)
• Right side of picture discoloured.
• Change of C2523.
• Noise in sound. Mute does not function.
• Dead. Only hum from speakers. (picture attached)
• How to reset microprocessor.
• Set goes accidentally into hotel mode.
• Sound varies with picture content. (20GR105266B tips)
• Excessive HV. after a while. (20GR105266B PHILIPS repair tip)
• Vertical line. on the right half screen. (part of circuit diagram displayed)
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• No start up, just a buzzing noise in speakers. (extract of circuit diagram attached)
• No picture and sound. Low hum intermittently, no function. (20GR105266B tip from PHILIPS)
• Difficult startup. Rattling sound from line output trafo.
• Reduced vertical size. at top.
• No tuning, no remote volume control. (with circuit diagram extract)
• "Store" key does not work. (picture attached)
• Field collapse normally with blank picture. (part of circuit diagram displayed)
• Adjustment of +95V. (extract of circuit diagram attached)
• Random breakdown of line output transistor. (picture attached)
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• Hums softly. (+ extract of circuit diagram)
• Reluctant to start from cold (with circuit diagram extract)
• Squealing from PSU.
• Sound increases intermittently or "pops", especially during bright scenes. (+ extract of circuit diagram)
• Dark picture. Audio OK .
• Vertical collapse. (extract of circuit diagram attached)
• No picture. No sound. Switching on and off from Standby OK.
• No start-up. Standby LED flashes . (20GR105266B PHILIPS repair tip)
• Programs and PP-settings cannot be changed.
• Change of C2523. (PHILIPS - 20GR105266B information)
• No OSD. Picture OK .
• Tuning drifts. only on certain channels (after a while).
• No switch on after activating mains switch. Whistling noise. (picture attached)
• Volume can't be tuned down. No tuning with RC. (part of circuit diagram displayed) (PHILIPS - 20GR105266B information)
• Volume change with great fluctuations in brightness. (with circuit diagram extract)
• White balance adjustment.
• Correction to service manual LOT winding.
• No colour and vertical black bar across screen.
• 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. (picture attached)
• Lines across top of picture about 8" in first 100 lines. (part of circuit diagram displayed)
• Tuning procedure.
• The fuse and the bridge diodes in the power supply blow.
• Standby just pulsing.
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• Line down middle of screen. (+ extract of circuit diagram)
• No audio.
• No transmitters to adjust and the sound is not controllable.
• Intermittent colour and intermittent dark vertical bar on picture.
• LED does not flash. Slight buzz in appliance. (with circuit diagram extract)
• Intermittent destruction of line o/p transistor. (+ extract of circuit diagram) (20GR105266B PHILIPS repair tip)
• How to switch off Hotel-Mode:
• Line output stage TS7528 is defective. (with circuit diagram extract)
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (with circuit diagram extract)
• Power supply does not oscillate. (+ extract of circuit diagram)
• 10V on 95V line. (with circuit diagram extract)
• The switched-mode power supply cannot be loaded.
• 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)
• No colour.
• Wavy picture. on the right.
• Height excessive. Defective linearity. Field blanking. (part of circuit diagram displayed)
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again.
• Dead. At switch on the stand by LED flashes.
• Rolling or jittering picture. (picture attached)
• To release hotel mode (child lock). (PHILIPS - 20GR105266B information)
• Picture appears slowly.
• Vertical vibration in cold condition of set.
• No channel search. No OSD. (+ extract of circuit diagram)
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• Right hand side of screen has a line. (20GR105266B tips)
• Whistling.
• Picture fails for a short time. (part of circuit diagram displayed)
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink. (service info for PHILIPS -20GR105266B)
• Does not start up at once from cold.
• No start-up. Buzzing from speakers and working noise of PSU.
• Line transistor 7528 blows within 1 sec. (extract of circuit diagram attached)
• No picture. TXT OK . (extract of circuit diagram attached)
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• No functions, hum in loudspeakers. (extract of circuit diagram attached)
• Local controls inoperative.
• How to switch off Hotel-Mode.
• Using a lamp as a load.
• 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.
• Tripping. (picture attached)
• No audio.
• Sound varies with picture content.
• No HT from chopper circuit. (extract of circuit diagram attached)
• Buzzing.
• Initial volume level is higher than maximum Hotel mode setting.
• Picture shifted to the left. intermittently. Line tearing. intermittently. (picture attached)
• Trips. (part of circuit diagram displayed)
• Loosing colour during play-back of a video tape. (extract of circuit diagram attached)
• How to de-activate Hotel mode.
• No picture. (with circuit diagram extract)
• Hotel Mode activates by itself. (with circuit diagram extract)
• No horizontal synchronisation. (+ extract of circuit diagram)
• Intermittently dead. (+ extract of circuit diagram)
• No picture, sound ok but on turning up A1 control, frame collapse. (+ extract of circuit diagram)
• Poor sync. AGC fault. (service info for PHILIPS -20GR105266B)
• Service manual correction. (picture attached)
• Won't tune a new channel. Won't activate store function. Picture OK. Sound OK.
• Line output transistor fails repeatedly. (part of circuit diagram displayed) (20GR105266B tips)
• The removal of leaded diodes. (extract of circuit diagram attached)
• Tuning drifts. only on certain channels.
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (part of circuit diagram displayed)
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (+ extract of circuit diagram)
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• Green screen with flyback line. No picture. OSD OK.
• Colour disappears with VCR-scan (picture search). (extract of circuit diagram attached)
• No colour.
• Horizontal white line.
• Unstable tuning.
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (picture attached)
• Set does not retune or program etc
• Horizontal oscillator adjustment procedure.
• Intermittent colour.
• Poor reproduction of copy protected tapes. (with circuit diagram extract)
• Line output transistor becomes warm and in the course of time it becomes defective. (with circuit diagram extract)
• Menu rolling. (picture attached)
• R-Y and B-Y discriminator adjustment procedure. (extract of circuit diagram attached)
• No tuning - no channels.
• Memory content dropout at positions 4 and 5.
• Picture displays lines and strange foldover effect at centre.
• Picture passes out in the centre.
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• No tuning. (extract of circuit diagram attached)
• Programme tuning difficulty, stations shifted on tuning bar. (+ extract of circuit diagram) (PHILIPS - 20GR105266B information)
• Two lines going around. (extract of circuit diagram attached)
• Dead, very slight whistle from PSU.
• No start-up. when cold. (+ extract of circuit diagram)
• Bell filter adjustment procedure.
• Programme tuning difficulty. Stations has shifted on tuning bar.
• Red picture. Flyback lines.
• Humming, motor noise and other unusual noises. Normal picture.
• Green picture with retrace lines. After a few restarts picture OK.
• Turns on automatically. No RC or front panel controls.
• Colour sync adjustment procedure.
• No HV.
• Buzz in audio (intermittently). (picture attached)
• Colours flicker and disappears.
• Initial volume level is higher than maximum Hotel mode setting.
• Buzzing sound then switches off.
• Appliance is dead with standby LED flashing after a few seconds. (with circuit diagram extract)
• No standby, humming and standby LED blinks.
• Vertical oscillator adjustment procedure.
• No tuning or on screen tuning display. (service info for PHILIPS -20GR105266B)
• Unable to tune or set volume in Prefix mode.
• Error messages indicated by front display flashing. (extract of circuit diagram attached)
• Store lock on the appliance.
• Unregulated power supply. Pulsating picture and surging sound. (extract of circuit diagram attached)
• CRT types.
• New infra red receiver.
• How to de-activate Hotel-Mode.
• Low audio. (20GR105266B tips)
• Slow start-up.
• No function at switch on from standby. Switches to LOCK (hotel) mode. (+ extract of circuit diagram)
• Appliance does not function with standby light flashing.
• No colour. (picture attached)
• Line output transistor running hot. (part of circuit diagram displayed)
• Enable Hotel mode.
• Programme channel search cannot be called up.
• Dim picture with Hanover bars. (20GR105266B tip from PHILIPS)
• Switches to standby. (extract of circuit diagram attached)
• Standby LED lights up and switches off at power on. Appliance will not start up.
• Unable to retune set or set analogue levels. Store-lock option may be on "Hotel mode".
• PSU does not start up, if appliance was switched off for a day. Appliance functions after short switch on/off. (+ extract of circuit diagram) (PHILIPS - 20GR105266B information)
• No function, starts up from standby, then goes out.
• Skips channels during tuning. only on certain channels.
• Stops at start up. (with circuit diagram extract) (PHILIPS - 20GR105266B information)
• Processor numbers (changed).
• Focus adjustment. (service info for PHILIPS -20GR105266B)
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (picture attached)
• No picture. No audio. (part of circuit diagram displayed)
• The TV cannot hold the picture.
• No start-up. intermittently (when cold). (with circuit diagram extract)
• Intermittently no picture and sound at switch on. Buzz from speaker. (part of circuit diagram displayed)
• Interference in audio. Interference in picture. (part of circuit diagram displayed)