20GR105270B / PHILIPS [TV 51 (47/48) cm picture]

• Picture is faint with hanover bars. (picture attached)
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (part of circuit diagram displayed)
• Standby LED lights up and switches off at power on. Appliance will not start up.
• No colour.
• Does not switch on, standby LED OK.
• No function. Standby LED flashes briefly. (picture attached)
• Excessive vertical size.
• Appliance will not switch on at times, but hums in the power supply section. (service info for PHILIPS -20GR105270B)
• Memory content dropout at positions 4 and 5.
• Squealing from PSU.
• 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. (+ extract of circuit diagram)
• Won't tune a new channel. Won't activate store function. Picture OK. Sound OK.
• How to reset microprocessor.
• During picture changes sometimes a volume increase (plop) is heard. (picture attached)
• Loud chriping after switch on. It becomes lower after a short time.
• No function. When switching on with RC, standby LED lights up. (picture attached)
• Searches for channels continuously. (extract of circuit diagram attached)
• Change of C2523.
• Height excessive. Defective linearity. Field blanking. (picture attached)
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• No vertical deflection. (extract of circuit diagram attached)
• Picture passes out in the centre.
• No operation.
• Error messages indicated by front display flashing. (extract of circuit diagram attached)
• No start up. No standby. Attempts to start up, but fails.
• Only half a picture. (part of circuit diagram displayed)
• No picture. Audio OK .
• Two lines going around. (+ extract of circuit diagram)
• The removal of leaded diodes. (+ extract of circuit diagram)
• Buzzing sound then switches off. (20GR105270B tip from PHILIPS)
• No tuning. No channel lock. (part of circuit diagram displayed)
• Blown chopper. (with circuit diagram extract)
• Picture shifted horizontally. (extract of circuit diagram attached)
• Difficult to tune programmes, stations shifted on tuning bar.
• Dead. (+ extract of circuit diagram)
• Poor synchronisation. (+ extract of circuit diagram)
• No start-up. Standby LED flashes .
• Sound varies with picture content.
• No tuning, no remote volume control. (with circuit diagram extract)
• No functions. Standby LED flashes. Relay switches to ON. (PHILIPS - 20GR105270B information)
• Line output stage does not start up. (part of circuit diagram displayed)
• Noise in sound. Mute does not function.
• Low audio. (part of circuit diagram displayed)
• The switched-mode power supply cannot be loaded.
• Picture fails for a short time. (part of circuit diagram displayed)
• Green screen and at other times no tuning. (picture attached) (service info for PHILIPS -20GR105270B)
• Store lock on the appliance.
• 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)
• Memory loss. (extract of circuit diagram attached)
• 10V on 95V line. (with circuit diagram extract)
• Does not regulate +95V.
• Trips. (+ extract of circuit diagram)
• Blank raster. Flyback lines. (with circuit diagram extract)
• Dead. Low level buzz from loudspeaker. (part of circuit diagram displayed)
• Line output transistor becomes warm and in the course of time it becomes defective. (with circuit diagram extract)
• No functions, hum in loudspeakers. (with circuit diagram extract)
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• Poor reproduction of copy protected tapes. (part of circuit diagram displayed)
• No audio.
• Initial volume level is higher than maximum Hotel mode setting.
• No switch on after activating mains switch. Whistling noise. (picture attached)
• Tuning drifts. only on certain channels (after a while).
• Volume varies. depending on picture content. (picture attached)
• Intermittent green picture, channels cannot be programmed. (picture attached)
• Reduced horizontal size. (extract of circuit diagram attached)
• No power supply start up in loaded condition (eg. with lamp). (20GR105270B tips)
• Change of C2523.
• After working normally for a while the TV blocks in any position. The functions do not work.
• To release hotel mode (child lock).
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (with circuit diagram extract)
• Vertical vibration in cold condition of set.
• Search jumps on UHF.
• No HT from chopper circuit. (extract of circuit diagram attached)
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• No start-up. intermittently (when cold). (with circuit diagram extract)
• Vertical roll. (part of circuit diagram displayed)
• Picture only in two bars in upper screen section, the rest is dark. (extract of circuit diagram attached) (20GR105270B tips)
• No switch on. Weak whistling noise from PSU. LED is OFF.
• No tuning. only on certain channels. (20GR105270B tip from PHILIPS)
• Intermittently dead. (with circuit diagram extract)
• Tuning menu can not be called. All other functions OK.
• Programme tuning difficulty, stations shifted on tuning bar. (with circuit diagram extract)
• Green picture.
• No OSD. Picture OK .
• Excessive HV. after a while.
• Defective purity.
• Dead with whistling noise coming from power supply. (picture attached)
• Unstable tuning.
• Blank or green raster. Flyback lines. Faint picture or normal picture. (extract of circuit diagram attached) (20GR105270B PHILIPS repair tip)
• Horizontal hold adjustment procedure.
• How to switch off Hotel-Mode:
• Green picture. (picture attached)
• Tuning drifts. (picture attached)
• No picture. (picture attached) (20GR105270B tip from PHILIPS)
• No voltage from PSU, computer does not work. (+ extract of circuit diagram)
• Picture shifted to the left. intermittently. Line tearing. intermittently. (part of circuit diagram displayed)
• No colour in OSD.
• Stops at start up. (with circuit diagram extract)
• Unable to retune set or set analogue levels. Store-lock option may be on "Hotel mode".
• Hums softly. (part of circuit diagram displayed)
• No connection for headphone.
• Print with linearity coil pos. 5800.
• No tuning or on screen tuning display.
• Intermittent colour. (PHILIPS - 20GR105270B information)
• Change of C2523.
• Initial volume level is higher than maximum Hotel mode setting.
• Sound goes to max. intermittently and HT varies. (part of circuit diagram displayed)
• Dead, very slight whistle from PSU.
• Set comes on in store lock mode. (+ extract of circuit diagram)
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes.
• 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.
• Green raster. Faint picture. Flyback lines.
• Description of SMPS. (part of circuit diagram displayed)
• Skips channels during tuning. (with circuit diagram extract)
• PSU check.
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels.
• No function. Standby-LED lights up. Appliance switches on but no picture or sound. (service info for PHILIPS -20GR105270B)
• Picture separating line appears. Whistling. (20GR105270B tip from PHILIPS)
• How to de-activate Hotel mode.
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• Programming unoperational. Limited sound adjustment possible.
• No colour and vertical black bar across screen.
• Modification introduced to +9V supply.
• Drive for high voltage missing. (with circuit diagram extract)
• Dark picture.
• Bright picture. Flyback lines.
• Colours flicker and disappears. (service info for PHILIPS -20GR105270B)
• Volume change with great fluctuations in brightness. (part of circuit diagram displayed)
• New infra red receiver.
• Bright flash on screen and no picture or sound after a few minutes. (+ extract of circuit diagram)
• Line output transistor fails repeatedly. (+ extract of circuit diagram)
• Dead due to action of over voltage protection circuit.
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (picture attached)
• Blue picture. Coloured lines.
• Initial volume level is higher than maximum Hotel mode setting.
• Low audio.
• Secondary main power supply OK except +9V at 5.8V
• Becomes defective immediately after switch on.
• How to switch off Hotel-Mode.
• No picture (when cold).
• Vertical line. on the right half screen. (extract of circuit diagram attached) (20GR105270B tips)
• No function at switch on from standby. Switches to LOCK (hotel) mode. (picture attached)
• Intermittent colour.
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (with circuit diagram extract)
• Random breakdown of line output transistor. (with circuit diagram extract)
• No start-up. intermittently.
• Appliance is dead with standby LED flashing after a few seconds. (part of circuit diagram displayed)
• Defective IC7103 SV-production. (with circuit diagram extract)
• No regulation. (picture attached)
• No line output stage. (+ extract of circuit diagram)
• Wavy picture. on the right.
• No start up, just a buzzing noise in speakers. (with circuit diagram extract) (20GR105270B tip from PHILIPS)
• Power supply fault finding. (with circuit diagram extract)
• Stuck in hotel mode.
• Reluctant to start up from cold.
• Green picture with retrace lines. After a few restarts picture OK.
• Set goes accidentally into hotel mode.
• Limited volume. No channel search. (20GR105270B tips)
• Poor sync. AGC fault.
• Line tearing, especially with bright scences. (part of circuit diagram displayed)
• No start-up. Buzzing from speakers and working noise of PSU. (20GR105270B tip from PHILIPS)
• White balance adjustment.
• Green picture.
• No line output.
• Unstable tuning.
• Streaks in picture. Picture pulls and rolls intermittently.
• Switches to standby. (+ extract of circuit diagram)
• Quick hiccup. (+ extract of circuit diagram)
• No +9V, line output stage is OK. (with circuit diagram extract)
• Control panel cover.
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (+ extract of circuit diagram)
• PAL colour amplitude adjustment procedure.
• Picture is poor with rippling on verticals. (with circuit diagram extract)
• Tuning drift, when it is hot the tuning is lost on channel change.
• Buzzing from PSU. when cold. (with circuit diagram extract)
• Stored channels are partially lost.
• Standby just pulsing.
• No picture, sound ok but on turning up A1 control, frame collapse. (part of circuit diagram displayed)
• Difficult startup. Rattling sound from line output trafo.
• Slow hiccup (with circuit diagram extract)
• Change of C2523.
• Does not shut down (when cold).
• Colour amplitude and phase adjustment procedure.
• No function, starts up from standby, then goes out.
• Bright flash on screen. No picture or sound. (+ extract of circuit diagram)
• Production change to line drive. (part of circuit diagram displayed)
• Noise in audio.
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound.
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• Right side of picture discoloured.
• Volume can't be tuned down. No tuning with RC. (+ extract of circuit diagram)
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (part of circuit diagram displayed)
• Dark picture. Audio OK .
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink.
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• Whistle.
• SIF DET adjustment procedure.
• Dead. Low frequency noise on sound. (PHILIPS - 20GR105270B information)
• How to de-activate Hotel-Mode:
• High voltage transistor defective after a while. (20GR105270B tips)
• Dim picture with Hanover bars.
• Colour sync adjustment procedure. (20GR105270B tip from PHILIPS)
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• LED switches on then off immediately.
• "Store" key does not work. (+ extract of circuit diagram)
• Strongly distorted sound by low volume.
• Replacement of TDA7052 with a TDA7052A.
• Chopper inoperative. (part of circuit diagram displayed)
• Picture is mostly green with flyback lines after 10 secs from switch on.
• Comes on for a short time.
• Picture appears slowly.
• No standby, humming and standby LED blinks.
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (+ extract of circuit diagram)
• Sound varies with picture content.
• Colour disappears with VCR-scan (picture search). (+ extract of circuit diagram)
• Red picture. Flyback lines.
• Occasionally appliance does not switch on from standby. No further functions are possible.
• Colours flickers and disappears.
• Programs and PP-settings cannot be changed.
• Turns on automatically. No RC or front panel controls.
• Control micro processors.
• No picture. No sound. Purring sound in loudspeaker. (extract of circuit diagram attached)
• Excessive horizontal size.
• Service manual correction. (part of circuit diagram displayed) (20GR105270B PHILIPS repair tip)
• No audio.
• Memory cannot be opened via "rhombus". Stored channels cannot be changed.
• No transmitters to adjust and the sound is not controllable.
• Line output stage TS7528 is defective. (extract of circuit diagram attached)
• Cannot be programmed and search does not function. Only limited volume adjustable.
• Blank raster. No audio. after a while. (+ extract of circuit diagram)
• Dead. Low hum.
• New IR receiver.
• Humming, motor noise and other unusual noises. Normal picture.
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (picture attached) (PHILIPS - 20GR105270B information)
• Replacing the EAROM. (+ extract of circuit diagram)
• No tuning possible, F2 appears on bottom of picture and S1 on top.
• Unstable tuning.
• Horizontal white line.
• No start-up. when cold. (with circuit diagram extract) (20GR105270B tips)
• No tuning.
• PSU does not start up, if appliance was switched off for a day. Appliance functions after short switch on/off. (part of circuit diagram displayed)
• No audio.
• Colours flickers and disappears.
• Line output transistor replacement.
• Dim picture with Hanover bars visible. (extract of circuit diagram attached)
• Connection of a loop system to the TV.
• Intermittently narrow picture, but corrects itself shortly after.
• No sound. No picture. Faint motorboating noise.
• Line tearing and rope effect.
• Tripping. (picture attached)
• CRT types.
• +B very high. (with circuit diagram extract) (20GR105270B tips)
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (picture attached)
• Switches off by itself. after a while. (extract of circuit diagram attached)
• Adjustment of +95V. (picture attached)
• Intermittent colour.
• Line tearing. on lower half screen. (with circuit diagram extract)
• Appliance can not be programmed. Search does not function. Only limited volume control.
• How to switch OFF Hotel-Mode.
• To put into hotel mode.
• Excessive brightness.
• No picture. No audio. (part of circuit diagram displayed)
• No colour.
• LED does not flash. Slight buzz in appliance. (extract of circuit diagram attached)
• Search jumps on UHF.
• Sound returns gradually after channel change. (extract of circuit diagram attached)
• Line down middle of screen. (with circuit diagram extract) (20GR105270B PHILIPS repair tip)
• No audio.
• Rolling or jittering picture. (with circuit diagram extract)
• Set does not retune or program etc
• Distorted audio.
• No picture and sound. Low hum intermittently, no function.
• No voltage from PSU. (part of circuit diagram displayed)
• Enter service mode.
• No sound or picture. Low hum from speaker. (extract of circuit diagram attached)
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again.
• Line out of phase. Black band in centre of screen. No colour.
• Bell filter adjustment procedure.
• Error codes.
• Tuning drifts. only on certain channels.
• No tuning. (part of circuit diagram displayed)
• Vertical size varies. intermittently.
• PSU switches off with load at U95V. (picture attached)
• Does not start up at once from cold.
• Intermittently dead. after start-up.
• Picture shifts. (extract of circuit diagram attached)
• Unregulated power supply. Pulsating picture and surging sound. (with circuit diagram extract)
• Automatic fine tuning (AFT) field alignment procedure.
• Skips channels during tuning. only on certain channels.
• No audio.
• Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel will not change. (+ extract of circuit diagram)
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• Interference in audio. Interference in picture. (part of circuit diagram displayed)
• Appliance does not function with standby light flashing.
• Set dead with just 5V on the 95V line. Standby LED is on but set won't start. (picture attached)
• Reduced vertical size. at top.
• No line start up; +95 available; +9V is about 4.5V. (with circuit diagram extract)
• No SOP supply. (part of circuit diagram displayed)
• Vertical oscillator adjustment procedure. (20GR105270B tip from PHILIPS)
• Enable Hotel mode. Disable hotel mode.
• Trips. at start-up (intermittently). (picture attached)
• No frame or short frame. (extract of circuit diagram attached)
• Buzzing.
• Stations won't change. Picture and sound OK. Other functions OK.
• No picture. TXT OK . (picture attached)
• Blank raster. OSD OK .
• How to de-activate Hotel-Mode.
• Crackling and popping in sound after a short time.
• Right hand side of screen has a line.
• How to de-activate volume limiter.
• Buzz in audio. No picture.
• Display goes to F1 a few seconds after switching the set on.
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (part of circuit diagram displayed)
• The tone (sound) tunes well, but the volume cannot be raised.
• 95V available. 9V is only 5.2V. Slight buzzing from loudspeakers.
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning.
• Programme tuning difficulty. Stations has shifted on tuning bar.
• V-centre adjustment procedure.
• Appliance hums slightly (no speaker) horizontal end stage and power supply transistor are ok. Unfortunately no service instructions available.
• Using a lamp as a load.
• Microcomputers and screening plate.
• No HV.
• Picture displays lines and strange foldover effect at centre.
• Whistling from PSU. (+ extract of circuit diagram) (20GR105270B PHILIPS repair tip)
• No functions. Hum in loudspeaker. No LED lit.
• Unstable tuning.
• Menu rolling. (part of circuit diagram displayed)
• Colour flickers. No colour. after a while. (extract of circuit diagram attached)
• No picture. OSD OK .
• Dead. Strange noises from PSU/ line output transformer. (extract of circuit diagram attached)
• SOPS defective. (with circuit diagram extract)
• Hazy flickering picture at top. (extract of circuit diagram attached)
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (picture attached)
• No or intermittent start-up. (with circuit diagram extract)
• Microprocessor screening plate. (picture attached)
• Line output transistor running hot. (picture attached)
• No colour. (service info for PHILIPS -20GR105270B)
• Correction to service manual LOT winding.
• No functions. Slow start-up. (part of circuit diagram displayed)
• Enable Hotel mode.
• Line output transistor TR7528 fails at switch on.
• Sound increases intermittently or "pops", especially during bright scenes. (part of circuit diagram displayed)
• Search jumps on UHF.
• 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.
• 6613 type change. (part of circuit diagram displayed)
• No picture. No sound. Switching on and off from Standby OK.
• Settings do not stay in position.
• Doesn't store stations correctly.
• Tuning procedure.
• Intermittent destruction of line o/p transistor. (extract of circuit diagram attached)
• No power with abnormal sound. (with circuit diagram extract)
• Loosing colour during play-back of a video tape. (picture attached)
• Delay RF AGC adjustment procedure. (service info for PHILIPS -20GR105270B)
• No audio.
• 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.
• Does not start. Slight buzzing in loudspeaker.
• No start-up. (with circuit diagram extract)
• Picture centering has shifted horizontally. No OSD.
• Unable to tune or set volume in Prefix mode.
• Protection device (thyristor THY6641) is triggered at switch on. (with circuit diagram extract) (20GR105270B tips)
• Stuck in standby. (extract of circuit diagram attached)
• Line output stage does not function. (20GR105270B PHILIPS repair tip)
• Programme channel search cannot be called up.
• Green screen with flyback line. No picture. OSD OK.
• 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)
• PSU peeps +95 is ca 0,8v
• Sound varies with picture content.
• Dead set. Tries to start.
• LED flashes once, then gurgles. (+ extract of circuit diagram)
• Difficultly in tuning to correct position.
• No audio.
• No colour. (part of circuit diagram displayed)
• No functions. when cold. (20GR105270B PHILIPS repair tip)
• Low 5V to micro chip. (part of circuit diagram displayed)
• Intermittently no picture and sound at switch on. Buzz from speaker. (part of circuit diagram displayed)
• No functions. after start-up (intermittently).
• Reluctant to start from cold (extract of circuit diagram attached)
• How to enter/exit HOTEL mode.
• Vertical collapse. (extract of circuit diagram attached)
• The fuse and the bridge diodes in the power supply blow.
• To remove store/lock.
• Line output stage only starts up for a short time. (with circuit diagram extract)
• No switch on. Low noise on sound. (extract of circuit diagram attached) (PHILIPS - 20GR105270B information)
• Poor synchronisation. when cold. (picture attached)
• Initial volume level is higher than maximum Hotel mode setting.
• No horizontal synchronisation. (+ extract of circuit diagram)
• Focus adjustment.
• After switching on the CTV "EXT...1.2.3..." appears on the screen.
• No start up from cold and humming.
• White unmodulated raster. Picture missing. (part of circuit diagram displayed)
• Does not stop on stations. (20GR105270B PHILIPS repair tip)
• Dead. Only hum from speakers. (+ extract of circuit diagram)
• Sound varies with picture content.
• No channel search. No OSD. (extract of circuit diagram attached)
• Change of C2523.
• Whistling.
• Dead. At switch on the stand by LED flashes.
• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (part of circuit diagram displayed)
• +9V supply modification. (picture attached)
• Smeary, washed out picture with bent verticals. (extract of circuit diagram attached)
• Intermittent colour and intermittent dark vertical bar on picture. (20GR105270B PHILIPS repair tip)
• 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)
• Lines across top of picture about 8" in first 100 lines. (+ extract of circuit diagram) (20GR105270B tip from PHILIPS)
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (extract of circuit diagram attached) (20GR105270B tips)
• No freeze frame or intermittent freeze frame; no sound. (with circuit diagram extract)
• The TV does not stop during the tuning phase.
• Excessive green.
• Identification coil adjustment.
• Processor numbers (changed).
• Slow start up of power supply. (+ extract of circuit diagram)
• Power supply does not oscillate. (with circuit diagram extract)
• No tuning bar when install button pressed and set not in hotel mode. (extract of circuit diagram attached)
• Replacement of surface mounted diode 6637. (part of circuit diagram displayed)
• No tuning - no channels.
• No functions. Sound buzzes in loudspeaker. (part of circuit diagram displayed)
• Intermittent audio and picture. (part of circuit diagram displayed)
• Field collapse normally with blank picture. (+ extract of circuit diagram)
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (+ extract of circuit diagram)
• Horizontal oscillator adjustment procedure.
• Local controls inoperative.
• Line transistor 7528 blows within 1 sec. (with circuit diagram extract)
• Low frequency noise on sound.
• Hotel mode.
• Modification at line transformer position 5530. (picture attached)
• U743 tuner replacement. (part of circuit diagram displayed)
• The TV cannot hold the picture.
• Picture shifted to the right. (picture attached)
• Buzz in audio (intermittently). (with circuit diagram extract)
• Slow start-up.
• Failures in the power supply. (part of circuit diagram displayed)
• Initial volume level is higher than maximum hotel mode setting.
• To improve performance with prerecorded cassettes. (part of circuit diagram displayed)
• Cannot change tuning or stored settings. (with circuit diagram extract) (20GR105270B tips)
• Lines on picture after approx one hour. It consists of a band of bright white lines about two inches wide. (+ extract of circuit diagram)
• Sound motorboating when cold. (part of circuit diagram displayed) (service info for PHILIPS -20GR105270B)
• Hotel Mode activates by itself. (part of circuit diagram displayed)
• Volume goes to max. No volume control.
• R-Y and B-Y discriminator adjustment procedure. (with circuit diagram extract)