20GR105250B / PHILIPS [TV 51 (47/48) cm picture]

• Defective purity.
• Poor synchronisation. when cold. (picture attached)
• Memory content dropout at positions 4 and 5.
• Appliance will not switch on at times, but hums in the power supply section.
• Cannot be programmed and search does not function. Only limited volume adjustable.
• Loud chriping after switch on. It becomes lower after a short time.
• Buzzing.
• Poor synchronisation. (with circuit diagram extract)
• Line output stage does not function.
• 95V available. 9V is only 5.2V. Slight buzzing from loudspeakers.
• No tuning.
• Searches for channels continuously. (picture attached) (20GR105250B tips)
• No freeze frame or intermittent freeze frame; no sound. (with circuit diagram extract)
• +B very high. (picture attached)
• Green screen and at other times no tuning. (extract of circuit diagram attached) (service info for PHILIPS -20GR105250B)
• Set comes on in store lock mode. (with circuit diagram extract)
• No HV.
• No functions. Standby LED flashes. Relay switches to ON.
• No line start up; +95 available; +9V is about 4.5V. (part of circuit diagram displayed)
• How to enter/exit HOTEL mode.
• Smeary, washed out picture with bent verticals. (+ extract of circuit diagram)
• Comes on for a short time.
• Power supply does not oscillate. (+ extract of circuit diagram)
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• To put into hotel mode.
• No picture. (picture attached)
• Memory loss. (with circuit diagram extract)
• The removal of leaded diodes. (with circuit diagram extract)
• Power supply fault finding. (part of circuit diagram displayed)
• Rolling or jittering picture. (+ extract of circuit diagram)
• Dead. Low hum.
• Dead. At switch on the stand by LED flashes.
• Dark picture. Audio OK .
• Microcomputers and screening plate.
• No audio.
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• Buzz in audio (intermittently). (picture attached) (20GR105250B tip from PHILIPS)
• Dead. Low frequency noise on sound.
• No sound. No picture. Faint motorboating noise.
• Modification introduced to +9V supply.
• +9V supply modification. (with circuit diagram extract)
• How to switch OFF Hotel-Mode.
• No power supply start up in loaded condition (eg. with lamp).
• Picture shifts. (with circuit diagram extract)
• No audio.
• LED flashes once, then gurgles. (part of circuit diagram displayed)
• Green picture with retrace lines. After a few restarts picture OK.
• No function. When switching on with RC, standby LED lights up. (picture attached) (service info for PHILIPS -20GR105250B)
• Blank raster. Flyback lines. (part of circuit diagram displayed)
• Enter service mode.
• Unstable tuning.
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• Line tearing. on lower half screen. (part of circuit diagram displayed)
• Picture is poor with rippling on verticals. (+ extract of circuit diagram)
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink.
• LED switches on then off immediately. (20GR105250B PHILIPS repair tip)
• Line down middle of screen. (extract of circuit diagram attached)
• Vertical oscillator adjustment procedure.
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• Distorted audio.
• Identification coil adjustment.
• Change of C2523.
• Squealing from PSU.
• Intermittent colour.
• Reduced vertical size. at top.
• No colour.
• Programming unoperational. Limited sound adjustment possible.
• No OSD. Picture OK .
• No function at switch on from standby. Switches to LOCK (hotel) mode. (part of circuit diagram displayed)
• Change of C2523.
• No functions. after start-up (intermittently).
• Slow start-up.
• Noise in audio.
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound.
• New IR receiver.
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (+ extract of circuit diagram)
• Picture is faint with hanover bars. (extract of circuit diagram attached)
• Blown chopper. (picture attached)
• Dark picture.
• Hazy flickering picture at top. (extract of circuit diagram attached)
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (with circuit diagram extract)
• Dead with whistling noise coming from power supply. (with circuit diagram extract)
• Line tearing and rope effect.
• Low audio.
• Low 5V to micro chip. (picture attached)
• Dead. Only hum from speakers. (picture attached) (20GR105250B tips)
• No connection for headphone.
• Standby LED lights up and switches off at power on. Appliance will not start up.
• Appliance hums slightly (no speaker) horizontal end stage and power supply transistor are ok. Unfortunately no service instructions available.
• Interference in audio. Interference in picture. (with circuit diagram extract) (20GR105250B tips)
• Settings do not stay in position.
• Right side of picture discoloured.
• Hotel Mode activates by itself. (extract of circuit diagram attached)
• No or intermittent start-up. (+ extract of circuit diagram)
• No HT from chopper circuit. (picture attached) (service info for PHILIPS -20GR105250B)
• Error codes.
• Turns on automatically. No RC or front panel controls.
• Intermittently narrow picture, but corrects itself shortly after.
• R-Y and B-Y discriminator adjustment procedure. (part of circuit diagram displayed)
• Vertical roll. (extract of circuit diagram attached)
• Colour amplitude and phase adjustment procedure.
• Print with linearity coil pos. 5800.
• Sound returns gradually after channel change. (with circuit diagram extract)
• Sound increases intermittently or "pops", especially during bright scenes. (part of circuit diagram displayed)
• Sound motorboating when cold. (picture attached) (20GR105250B tip from PHILIPS)
• Limited volume. No channel search.
• SOPS defective. (part of circuit diagram displayed)
• No functions. Sound buzzes in loudspeaker. (part of circuit diagram displayed)
• Blue picture. Coloured lines.
• Random breakdown of line output transistor. (+ extract of circuit diagram)
• Defective IC7103 SV-production. (part of circuit diagram displayed)
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes.
• No tuning bar when install button pressed and set not in hotel mode. (part of circuit diagram displayed)
• Reluctant to start from cold (extract of circuit diagram attached)
• Switches off by itself. after a while. (extract of circuit diagram attached)
• No colour in OSD.
• Tuning drifts. only on certain channels.
• The switched-mode power supply cannot be loaded.
• Won't tune a new channel. Won't activate store function. Picture OK. Sound OK.
• Enable Hotel mode.
• The TV cannot hold the picture.
• No tuning. (part of circuit diagram displayed)
• To remove store/lock.
• Reduced horizontal size. (part of circuit diagram displayed)
• Skips channels during tuning. (extract of circuit diagram attached)
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (picture attached)
• No audio. (20GR105250B PHILIPS repair tip)
• PSU check.
• No picture. No audio. (extract of circuit diagram attached)
• Line transistor 7528 blows within 1 sec. (+ extract of circuit diagram)
• Initial volume level is higher than maximum Hotel mode setting.
• Only half a picture. (extract of circuit diagram attached)
• Local controls inoperative.
• Intermittent destruction of line o/p transistor. (picture attached)
• Horizontal white line.
• No sound or picture. Low hum from speaker. (extract of circuit diagram attached)
• Excessive brightness.
• Does not switch on, standby LED OK.
• No tuning. only on certain channels.
• Service manual correction. (with circuit diagram extract)
• The tone (sound) tunes well, but the volume cannot be raised.
• Line tearing, especially with bright scences. (part of circuit diagram displayed)
• Quick hiccup. (with circuit diagram extract)
• No SOP supply. (picture attached)
• Set goes accidentally into hotel mode. (20GR105250B PHILIPS repair tip)
• No picture. OSD OK .
• Buzz in audio. No picture. (PHILIPS - 20GR105250B information)
• No function, starts up from standby, then goes out.
• Stored channels are partially lost. (20GR105250B tips)
• No start up, just a buzzing noise in speakers. (picture attached)
• Slow start up of power supply. (+ extract of circuit diagram)
• Memory cannot be opened via "rhombus". Stored channels cannot be changed.
• Stops at start up. (extract of circuit diagram attached)
• Hotel mode.
• Intermittently no picture and sound at switch on. Buzz from speaker. (+ extract of circuit diagram)
• Picture fails for a short time. (with circuit diagram extract)
• 6613 type change. (with circuit diagram extract)
• No start up from cold and humming.
• Green screen with flyback line. No picture. OSD OK.
• Excessive vertical size.
• Wavy picture. on the right.
• Does not start up at once from cold.
• Search jumps on UHF.
• Vertical vibration in cold condition of set.
• No functions. Hum in loudspeaker. No LED lit.
• Poor sync. AGC fault.
• Occasionally appliance does not switch on from standby. No further functions are possible.
• The TV does not stop during the tuning phase.
• Picture is mostly green with flyback lines after 10 secs from switch on. (20GR105250B PHILIPS repair tip)
• Store lock on the appliance.
• Tuning procedure.
• Colour flickers. No colour. after a while. (part of circuit diagram displayed)
• No functions. Slow start-up. (with circuit diagram extract)
• No regulation. (extract of circuit diagram attached)
• No audio.
• Initial volume level is higher than maximum Hotel mode setting.
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• Does not start. Slight buzzing in loudspeaker.
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• Humming, motor noise and other unusual noises. Normal picture.
• Unstable tuning.
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (picture attached)
• Doesn't store stations correctly.
• Unable to retune set or set analogue levels. Store-lock option may be on "Hotel mode".
• Difficultly in tuning to correct position.
• Picture passes out in the centre.
• Picture only in two bars in upper screen section, the rest is dark. (part of circuit diagram displayed)
• Picture appears slowly.
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (+ extract of circuit diagram)
• No switch on. Weak whistling noise from PSU. LED is OFF.
• Processor numbers (changed). (20GR105250B PHILIPS repair tip)
• How to reset microprocessor.
• Intermittent colour.
• Enable Hotel mode. Disable hotel mode.
• Intermittent audio and picture. (+ extract of circuit diagram)
• Green picture.
• No tuning, no remote volume control. (picture attached) (PHILIPS - 20GR105250B information)
• Field collapse normally with blank picture. (picture attached) (service info for PHILIPS -20GR105250B)
• No tuning. No channel lock. (extract of circuit diagram attached)
• 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.
• Delay RF AGC adjustment procedure.
• How to de-activate Hotel-Mode:
• Sometimes when turned on, green screen only with flyback lines, at other times no tuning and channel will not change. (picture attached)
• Picture shifted to the right. (part of circuit diagram displayed)
• Skips channels during tuning. only on certain channels.
• 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. (with circuit diagram extract)
• Dim picture with Hanover bars.
• Picture shifted horizontally. (extract of circuit diagram attached)
• Change of C2523.
• Dead set. Tries to start.
• To improve performance with prerecorded cassettes. (with circuit diagram extract)
• Sound varies with picture content.
• Volume varies. depending on picture content. (picture attached)
• No picture. No sound. Switching on and off from Standby OK.
• Does not shut down (when cold). (PHILIPS - 20GR105250B information)
• Strongly distorted sound by low volume.
• No start-up. intermittently (when cold). (with circuit diagram extract)
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (with circuit diagram extract)
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• No colour. (picture attached)
• Control micro processors.
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (picture attached)
• Buzzing from PSU. when cold. (picture attached) (PHILIPS - 20GR105250B information)
• 10V on 95V line. (with circuit diagram extract)
• Stuck in standby. (extract of circuit diagram attached)
• Picture displays lines and strange foldover effect at centre.
• No audio.
• "Store" key does not work. (with circuit diagram extract)
• No tuning or on screen tuning display.
• No start-up. Buzzing from speakers and working noise of PSU.
• CRT types.
• Colour disappears with VCR-scan (picture search). (with circuit diagram extract)
• Initial volume level is higher than maximum Hotel mode setting.
• Initial volume level is higher than maximum hotel mode setting.
• Adjustment of +95V. (picture attached)
• Connection of a loop system to the TV.
• No switch on. Low noise on sound. (extract of circuit diagram attached)
• V-centre adjustment procedure.
• Green picture.
• Sound varies with picture content.
• Appliance is dead with standby LED flashing after a few seconds. (part of circuit diagram displayed) (service info for PHILIPS -20GR105250B)
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (picture attached)
• Bright picture. Flyback lines.
• Blank raster. No audio. after a while. (part of circuit diagram displayed)
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (extract of circuit diagram attached)
• Search jumps on UHF.
• No colour and vertical black bar across screen.
• Stations won't change. Picture and sound OK. Other functions OK.
• Green picture. (picture attached)
• No start-up. Standby LED flashes . (20GR105250B PHILIPS repair tip)
• Chopper inoperative. (part of circuit diagram displayed)
• Cannot change tuning or stored settings. (extract of circuit diagram attached)
• Production change to line drive. (picture attached)
• Intermittent colour.
• Trips. (part of circuit diagram displayed) (service info for PHILIPS -20GR105250B)
• Low frequency noise on sound.
• 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 fuse and the bridge diodes in the power supply blow.
• Drive for high voltage missing. (picture attached)
• LED does not flash. Slight buzz in appliance. (picture attached)
• PSU does not start up, if appliance was switched off for a day. Appliance functions after short switch on/off. (with circuit diagram extract)
• Programme tuning difficulty, stations shifted on tuning bar. (with circuit diagram extract)
• Change of C2523.
• No voltage from PSU. (extract of circuit diagram attached)
• No functions, hum in loudspeakers. (picture attached)
• No voltage from PSU, computer does not work. (+ extract of circuit diagram)
• Using a lamp as a load.
• Unregulated power supply. Pulsating picture and surging sound. (+ extract of circuit diagram)
• No start-up. intermittently.
• No functions. when cold. (PHILIPS - 20GR105250B information)
• No colour.
• Becomes defective immediately after switch on.
• Dead. Strange noises from PSU/ line output transformer. (picture attached)
• Bell filter adjustment procedure.
• Dead, very slight whistle from PSU.
• No switch on after activating mains switch. Whistling noise. (extract of circuit diagram attached)
• Dead. (picture attached)
• Search jumps on UHF.
• Excessive HV. after a while.
• Control panel cover.
• Line output transistor replacement.
• White balance adjustment.
• PSU switches off with load at U95V. (+ 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. (picture attached)
• How to switch off Hotel-Mode.
• Reluctant to start up from cold.
• Colours flickers and disappears.
• Appliance can not be programmed. Search does not function. Only limited volume control.
• Line output transistor running hot. (part of circuit diagram displayed)
• Right hand side of screen has a line.
• Line output transistor becomes warm and in the course of time it becomes defective. (part of circuit diagram displayed)
• To release hotel mode (child lock).
• No vertical deflection. (picture attached) (20GR105250B PHILIPS repair tip)
• Display goes to F1 a few seconds after switching the set on.
• No transmitters to adjust and the sound is not controllable.
• Correction to service manual LOT winding.
• 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. (extract of circuit diagram attached)
• Line out of phase. Black band in centre of screen. No colour.
• No operation.
• No standby, humming and standby LED blinks.
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (part of circuit diagram displayed)
• No start-up. (+ extract of circuit diagram)
• White unmodulated raster. Picture missing. (with circuit diagram extract)
• Volume goes to max. No volume control.
• Programme tuning difficulty. Stations has shifted on tuning bar.
• Intermittent green picture, channels cannot be programmed. (extract of circuit diagram attached)
• Tuning drifts. (part of circuit diagram displayed)
• No function. Standby LED flashes briefly. (part of circuit diagram displayed)
• Difficult to tune programmes, stations shifted on tuning bar.
• No colour.
• Replacing the EAROM. (+ extract of circuit diagram)
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• Unstable tuning. (service info for PHILIPS -20GR105250B)
• Lines across top of picture about 8" in first 100 lines. (part of circuit diagram displayed)
• Menu rolling. (extract of circuit diagram attached) (20GR105250B tip from PHILIPS)
• Intermittently dead. after start-up.
• 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) (service info for PHILIPS -20GR105250B)
• Dim picture with Hanover bars visible. (picture attached)
• Green raster. Faint picture. Flyback lines. (20GR105250B tips)
• Sound varies with picture content.
• Low audio. (with circuit diagram extract)
• No picture (when cold).
• Poor reproduction of copy protected tapes. (extract of circuit diagram attached)
• Picture shifted to the left. intermittently. Line tearing. intermittently. (with circuit diagram extract)
• No +9V, line output stage is OK. (picture attached)
• Horizontal oscillator adjustment procedure.
• New infra red receiver.
• Trips. at start-up (intermittently). (with circuit diagram extract)
• Modification at line transformer position 5530. (+ extract of circuit diagram)
• Picture centering has shifted horizontally. No OSD.
• How to de-activate volume limiter.
• Line output stage TS7528 is defective. (extract of circuit diagram attached)
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (picture attached)
• No start up. No standby. Attempts to start up, but fails.
• High voltage transistor defective after a while. (PHILIPS - 20GR105250B information)
• Automatic fine tuning (AFT) field alignment procedure.
• Vertical collapse. (+ extract of circuit diagram)
• Does not stop on stations.
• Whistling from PSU. (+ extract of circuit diagram)
• No function. Standby-LED lights up. Appliance switches on but no picture or sound.
• No picture. TXT OK . (extract of circuit diagram attached)
• Sound goes to max. intermittently and HT varies. (extract of circuit diagram attached)
• Tuning drifts. only on certain channels (after a while).
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels. (service info for PHILIPS -20GR105250B)
• Line output transistor TR7528 fails at switch on.
• Intermittently dead. (part of circuit diagram displayed)
• No tuning possible, F2 appears on bottom of picture and S1 on top.
• Slow hiccup (picture attached)
• During picture changes sometimes a volume increase (plop) is heard. (with circuit diagram extract)
• Set does not retune or program etc (20GR105250B PHILIPS repair tip)
• How to de-activate Hotel mode.
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning.
• Microprocessor screening plate. (extract of circuit diagram attached)
• Does not regulate +95V.
• Sound varies with picture content.
• Noise in sound. Mute does not function.
• No channel search. No OSD. (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)
• After switching on the CTV "EXT...1.2.3..." appears on the screen.
• Focus adjustment.
• No line output stage. (+ extract of circuit diagram)
• Change of C2523.
• Secondary main power supply OK except +9V at 5.8V
• No picture, sound ok but on turning up A1 control, frame collapse. (part of circuit diagram displayed)
• Vertical size varies. intermittently.
• Colours flickers and disappears.
• Standby just pulsing.
• No tuning - no channels.
• Stuck in hotel mode.
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (picture attached)
• PAL colour amplitude adjustment procedure.
• No start-up. when cold. (+ extract of circuit diagram)
• No line output.
• No audio.
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• Volume can't be tuned down. No tuning with RC. (extract of circuit diagram attached)
• U743 tuner replacement. (part of circuit diagram displayed)
• Vertical line. on the right half screen. (+ extract of circuit diagram)
• No picture and sound. Low hum intermittently, no function.
• Programme channel search cannot be called up.
• Switches to standby. (picture attached)
• No picture. Audio OK .
• Dead due to action of over voltage protection circuit.
• Bright flash on screen. No picture or sound. (picture attached)
• Appliance does not function with standby light flashing.
• Hums softly. (picture attached)
• Picture separating line appears. Whistling.
• Initial volume level is higher than maximum Hotel mode setting. (service info for PHILIPS -20GR105250B)
• Replacement of TDA7052 with a TDA7052A.
• Programs and PP-settings cannot be changed.
• Failures in the power supply. (+ extract of circuit diagram)
• Tripping. (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)
• Difficult startup. Rattling sound from line output trafo.
• After working normally for a while the TV blocks in any position. The functions do not work.
• Loosing colour during play-back of a video tape. (part of circuit diagram displayed)
• Line output stage only starts up for a short time. (with circuit diagram extract)
• Unstable tuning. (20GR105250B tip from PHILIPS)
• How to de-activate Hotel-Mode.
• SIF DET adjustment procedure.
• Intermittent colour and intermittent dark vertical bar on picture.
• PSU peeps +95 is ca 0,8v (20GR105250B tips)
• Dead. Low level buzz from loudspeaker. (extract of circuit diagram attached)
• Error messages indicated by front display flashing. (with circuit diagram extract)
• Excessive horizontal size.
• Colour sync adjustment procedure.
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (+ extract of circuit diagram) (20GR105250B tips)
• Whistle.
• No frame or short frame. (part of circuit diagram displayed)
• Crackling and popping in sound after a short time.
• Horizontal hold adjustment procedure.
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again.
• Tuning menu can not be called. All other functions OK. (PHILIPS - 20GR105250B information)
• Bright flash on screen and no picture or sound after a few minutes. (with circuit diagram extract)
• Line output stage does not start up. (part of circuit diagram displayed)
• No power with abnormal sound. (with circuit diagram extract)
• Buzzing sound then switches off.
• Protection device (thyristor THY6641) is triggered at switch on. (+ extract of circuit diagram)
• No horizontal synchronisation. (picture attached)
• Unable to tune or set volume in Prefix mode.
• Red picture. Flyback lines.
• Volume change with great fluctuations in brightness. (extract of circuit diagram attached)
• Whistling.
• Description of SMPS. (+ extract of circuit diagram)
• How to switch off Hotel-Mode:
• Line output transistor fails repeatedly. (part of circuit diagram displayed)
• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (picture attached)
• No audio.
• Blank or green raster. Flyback lines. Faint picture or normal picture. (part of circuit diagram displayed)
• Excessive green.
• No picture. No sound. Purring sound in loudspeaker. (picture attached) (20GR105250B PHILIPS repair tip)
• Two lines going around. (with circuit diagram extract)
• 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.
• Colours flicker and disappears. (20GR105250B tips)
• Blank raster. OSD OK .
• Replacement of surface mounted diode 6637. (picture attached)
• Height excessive. Defective linearity. Field blanking. (with circuit diagram extract)
• Tuning drift, when it is hot the tuning is lost on channel change.
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• Streaks in picture. Picture pulls and rolls intermittently.