20GR105079R / PHILIPS [TV]

• No switch on. Weak whistling noise from PSU. LED is OFF.
• Processor numbers (changed).
• Switches to standby. (+ extract of circuit diagram)
• Comes on in standby. When program button pressed standby lamp blinks then goes off.
• Vertical collapse. (with circuit diagram extract)
• Automatic fine tuning (AFT) field alignment procedure.
• Doesn't tune stations correctly. When cold, crossed lines on low UHF channels. (extract of circuit diagram attached)
• PSU peeps +95 is ca 0,8v
• No start-up. Standby LED flashes .
• To release hotel mode (child lock).
• Initial volume level is higher than maximum Hotel mode setting.
• Hotel mode.
• No functions. Slow start-up. (part of circuit diagram displayed)
• Control panel cover. (20GR105079R tips)
• Sound returns gradually after channel change. (part of circuit diagram displayed)
• No tuning. (part of circuit diagram displayed)
• Power supply fault finding. (picture attached)
• Intermittently no picture and sound at switch on. Buzz from speaker. (extract of circuit diagram attached)
• After replacement of the line output transistor BUT12, picture with trapezoid effect, BUT12 overheats and goes defective again. (with circuit diagram extract)
• Green picture. (20GR105079R tips)
• No colour in OSD.
• Buzzing sound then switches off.
• Line chirps intermittently. Appliance does not start. Only hum from loudspeakers.
• No audio.
• Blank raster. No audio. after a while. (extract of circuit diagram attached) (20GR105079R tip from PHILIPS)
• Whistling from PSU. (+ extract of circuit diagram)
• No start up, just a buzzing noise in speakers. (with circuit diagram extract)
• Only half a picture. (+ extract of circuit diagram)
• Slow start-up.
• Search jumps on UHF.
• 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)
• No audio.
• Programs and PP-settings cannot be changed.
• No start-up. intermittently.
• Green picture.
• Reluctant to start from cold (part of circuit diagram displayed) (20GR105079R PHILIPS repair tip)
• No colour.
• No switch on. Low noise on sound. (extract of circuit diagram attached)
• Picture is poor with rippling on verticals. (with circuit diagram extract)
• Using a lamp as a load.
• Low audio. (20GR105079R tips)
• Won't tune a new channel. Won't activate store function. Picture OK. Sound OK.
• Vertical size varies. intermittently. (PHILIPS - 20GR105079R information)
• Failures in the power supply. (picture attached) (20GR105079R tips)
• New infra red receiver.
• Does not regulate +95V. (20GR105079R tip from PHILIPS)
• Sound varies with picture content.
• Line down middle of screen. (with circuit diagram extract)
• No operation.
• No function, starts up from standby, then goes out.
• Volume change with great fluctuations in brightness. (picture attached)
• Skips channels during tuning. only on certain channels.
• No function. Standby-LED lights up. Appliance switches on but no picture or sound.
• Whistling. (20GR105079R tip from PHILIPS)
• V-centre adjustment procedure.
• Picture shifted to the left. intermittently. Line tearing. intermittently. (part of circuit diagram displayed)
• The TV does not stop during the tuning phase.
• White balance adjustment.
• Line output stage does not function.
• Set comes on in store lock mode. (with circuit diagram extract)
• Change of C2523.
• Service manual correction. (part of circuit diagram displayed)
• Appliance does not function with standby light flashing.
• No picture. (picture attached)
• Switches off by itself. after a while. (+ extract of circuit diagram)
• Lines across top of picture about 8" in first 100 lines. (part of circuit diagram displayed) (20GR105079R tips)
• LED does not flash. Slight buzz in appliance. (with circuit diagram extract)
• Appliance can not be programmed. Search does not function. Only limited volume control.
• Initial volume level is higher than maximum Hotel mode setting.
• No start-up. Buzzing from speakers and working noise of PSU.
• Line out of phase. Black band in centre of screen. No colour.
• No power supply start up in loaded condition (eg. with lamp).
• Dead set. Tries to start.
• Noise in sound. Mute does not function.
• Appliance hums slightly (no speaker) horizontal end stage and power supply transistor are ok. Unfortunately no service instructions available.
• Difficult to tune programmes, stations shifted on tuning bar.
• Spurious nonsense OSG. Goes to standby after 0.5-2hrs. Loss of tuning. (service info for PHILIPS -20GR105079R)
• Reduced horizontal size. (extract of circuit diagram attached)
• Trips. at start-up (intermittently). (with circuit diagram extract)
• Line output transistor running hot. (with circuit diagram extract) (20GR105079R tips)
• SOPS defective. (with circuit diagram extract)
• How to de-activate volume limiter.
• Bell filter adjustment procedure.
• Stuck in hotel mode.
• The removal of leaded diodes. (+ extract of circuit diagram)
• Distorted audio.
• White unmodulated raster. Picture missing. (picture attached)
• Enter service mode.
• Noise in audio. (service info for PHILIPS -20GR105079R)
• No power with abnormal sound. (picture attached)
• Dead. (picture attached) (20GR105079R tip from PHILIPS)
• 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) (20GR105079R PHILIPS repair tip)
• 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.
• Blown chopper. (extract of circuit diagram attached)
• Dead. Only hum from speakers. (picture attached)
• Programme tuning difficulty. Stations has shifted on tuning bar.
• SIF DET adjustment procedure.
• No functions. Standby LED flashes. Relay switches to ON.
• Excessive brightness.
• Becomes defective immediately after switch on.
• Set won't tune to high frequency channels and lower frequency channels appear to be higher. (extract of circuit diagram attached)
• Buzzing.
• Picture passes out in the centre.
• How to switch off Hotel-Mode:
• Colour disappears with VCR-scan (picture search). (extract of circuit diagram attached)
• The switched-mode power supply cannot be loaded.
• Horizontal white line.
• Poor synchronisation. (picture attached)
• No horizontal synchronisation. (extract of circuit diagram attached)
• High voltage transistor defective after a while.
• Line tearing and rope effect.
• Secondary main power supply OK except +9V at 5.8V
• How to de-activate Hotel-Mode.
• Doesn't store stations correctly.
• Green picture with retrace lines. After a few restarts picture OK.
• Dead. At switch on the stand by LED flashes.
• Picture fails for a short time. (extract of circuit diagram attached)
• Dead. Power LED is OFF (ON in standby). Hissing from PSU.
• Line output transistor replacement.
• During picture changes sometimes a volume increase (plop) is heard. (part of circuit diagram displayed) (20GR105079R tip from PHILIPS)
• Stops at start up. (+ extract of circuit diagram)
• Defective IC7103 SV-production. (with circuit diagram extract)
• Appliance is dead with standby LED flashing after a few seconds. (with circuit diagram extract)
• No line output.
• No sound or picture. Low hum from speaker. (part of circuit diagram displayed)
• No colour and vertical black bar across screen.
• 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.
• 10V on 95V line. (with circuit diagram extract)
• Intermittent colour.
• Adjustment of +95V. (+ extract of circuit diagram)
• How to switch OFF Hotel-Mode.
• Unregulated power supply. Pulsating picture and surging sound. (extract of circuit diagram attached)
• Defective purity.
• After switching on the CTV "EXT...1.2.3..." appears on the screen.
• No audio.
• CRT types.
• Unable to retune set or set analogue levels. Store-lock option may be on "Hotel mode".
• Change of C2523.
• Picture is mostly green with flyback lines after 10 secs from switch on.
• Does not switch on. LED is lit in standby. If appliance is switched on with RC, LED switches off.
• Only some programs with snowy picture can be tuned and on band 1 missing some programs. (extract of circuit diagram attached)
• How to de-activate Hotel mode.
• Microcomputers and screening plate.
• No function at switch on from standby. Switches to LOCK (hotel) mode. (extract of circuit diagram attached)
• Stored channels are partially lost.
• Dead, very slight whistle from PSU.
• Difficultly in tuning to correct position.
• No sound. Picture OK. After a short time TV stops. High frequency noise from PSU. (part of circuit diagram displayed)
• Slow start up of power supply. (with circuit diagram extract)
• No start-up. intermittently (when cold). (with circuit diagram extract)
• Green picture after few hours, intermittently fault disappears for short while when switching from a station to another. Strange characters in OSD.
• Unstable tuning.
• Height excessive. Defective linearity. Field blanking. (extract of circuit diagram attached)
• Line output transistor becomes warm and in the course of time it becomes defective. (+ extract of circuit diagram)
• Picture appears slowly.
• +B very high. (extract of circuit diagram attached)
• Sound goes to max. intermittently and HT varies. (extract of circuit diagram attached)
• Replacement of TDA7052 with a TDA7052A.
• Does not stop on stations.
• Tuning drift, when it is hot the tuning is lost on channel change.
• Microprocessor screening plate. (+ extract of circuit diagram)
• No tuning - no channels. (20GR105079R tips)
• No picture and sound. Low hum intermittently, no function.
• Loud chriping after switch on. It becomes lower after a short time.
• Cannot change tuning or stored settings. (picture attached)
• "Store" key does not work. (+ extract of circuit diagram)
• Hazy flickering picture at top. (+ extract of circuit diagram)
• No HV.
• Low frequency noise on sound.
• No audio. (20GR105079R PHILIPS repair tip)
• No picture. No audio. (part of circuit diagram displayed)
• Does not shut down (when cold).
• Intermittent channel drift in UHF. Channel search OK. VHF OK.
• No frame or short frame. (with circuit diagram extract)
• Programming unoperational. Limited sound adjustment possible.
• No start up. No standby. Attempts to start up, but fails.
• Line output transistor TR7528 fails at switch on.
• Intermittent audio and picture. (extract of circuit diagram attached)
• No colour. (20GR105079R tips)
• Does not switch on, standby LED OK.
• Colours flickers and disappears.
• No functions. when cold.
• Vertical amplitude cannot be fully adjusted, TXT lines can be seen. (with circuit diagram extract)
• Random breakdown of line output transistor. (part of circuit diagram displayed)
• Blue picture. Coloured lines.
• Reduced vertical size. at top.
• Unstable tuning.
• Protection device (thyristor THY6641) is triggered at switch on. (part of circuit diagram displayed)
• Volume can't be tuned down. No tuning with RC. (picture attached)
• Green picture. after warm-up. Lines in picture. after warm-up. Does not change channels.
• Display goes to F1 a few seconds after switching the set on.
• Search jumps on UHF.
• Stored channels drift off tune briefly after switch on. Crackle in sound.
• Replacing the EAROM. (with circuit diagram extract)
• No functions, hum in loudspeakers. (extract of circuit diagram attached)
• Colours flickers and disappears.
• No transmitters to adjust and the sound is not controllable.
• Set does not retune or program etc
• Red picture. Flyback lines. (service info for PHILIPS -20GR105079R)
• Programme tuning difficulty, stations shifted on tuning bar. (extract of circuit diagram attached)
• Skips channels during tuning. (+ extract of circuit diagram)
• Will not tune, drifts, colour disappears or interference on a certain channel. (e.g. channel 5 and 59)
• The tone (sound) tunes well, but the volume cannot be raised.
• Quick hiccup. (picture attached)
• Intermittent colour.
• No colour. (+ extract of circuit diagram)
• Dark picture.
• Blank raster. OSD OK .
• Colour sync adjustment procedure.
• Colour flickers. No colour. after a while. (+ extract of circuit diagram)
• Poor reproduction of copy protected tapes. (+ extract of circuit diagram)
• New IR receiver.
• Field foldover at switch on from cold. Effect disappears when appliance warms up. (with circuit diagram extract)
• Line output stage does not start up. (+ extract of circuit diagram)
• Initial volume level is higher than maximum Hotel mode setting. (service info for PHILIPS -20GR105079R)
• Squealing from PSU.
• Standby LED lights up and switches off at power on. Appliance will not start up.
• Control micro processors.
• Poor sound, cannot be adjusted louder. When adjusting, sound cuts out. (part of circuit diagram displayed)
• Reluctant to start up from cold.
• No tuning. No channel lock. (+ extract of circuit diagram)
• Blank raster. Flyback lines. (part of circuit diagram displayed)
• 6613 type change. (extract of circuit diagram attached)
• The TV cannot hold the picture.
• Colours flicker and disappears.
• Picture shifted to the right. (part of circuit diagram displayed)
• Store lock on the appliance.
• To put into hotel mode.
• Slow hiccup (extract of circuit diagram attached) (service info for PHILIPS -20GR105079R)
• 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)
• Identification coil adjustment. (PHILIPS - 20GR105079R information)
• Enable Hotel mode.
• Low audio. (with circuit diagram extract)
• No OSD. Picture OK .
• Dead with whistling noise coming from power supply. (part of circuit diagram displayed)
• Buzz in audio (intermittently). (+ extract of circuit diagram)
• Line output stage TS7528 is defective. (picture attached) (20GR105079R tips)
• How to switch off Hotel-Mode.
• Occasionally appliance does not switch on from standby. No further functions are possible.
• Picture shifts. (with circuit diagram extract)
• Menu rolling. (part of circuit diagram displayed)
• Memory content dropout at positions 4 and 5.
• Vertical oscillator adjustment procedure.
• No tuning or on screen tuning display.
• Vertical roll. (extract of circuit diagram attached)
• 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.
• How to reset microprocessor.
• No start-up. (part of circuit diagram displayed)
• Dead. Low hum.
• No tuning. Impossible to change analog control adjustments (brightness, sound, etc.). (part of circuit diagram displayed)
• No HT from chopper circuit. (part of circuit diagram displayed) (20GR105079R tip from PHILIPS)
• Horizontal hold adjustment procedure.
• Poor sync. AGC fault.
• Error messages indicated by front display flashing. (extract of circuit diagram attached)
• Enable Hotel mode. Disable hotel mode.
• Green raster. Faint picture. Flyback lines.
• Set goes accidentally into hotel mode.
• Bright picture. Flyback lines.
• Memory cannot be opened via "rhombus". Stored channels cannot be changed.
• Drive for high voltage missing. (extract of circuit diagram attached)
• Humming, motor noise and other unusual noises. Normal picture.
• Stations won't change. Picture and sound OK. Other functions OK. (20GR105079R tip from PHILIPS)
• Modification introduced to +9V supply.
• Strongly distorted sound by low volume.
• Tuning menu can not be called. All other functions OK.
• Excessive green.
• PSU check.
• No picture. Audio OK .
• No start-up. when cold. (picture attached) (service info for PHILIPS -20GR105079R)
• Comes on for a short time.
• Loosing colour during play-back of a video tape. (+ extract of circuit diagram)
• Search jumps on UHF.
• Buzz in audio. No picture.
• Intermittently narrow picture, but corrects itself shortly after.
• After working normally for a while the TV blocks in any position. The functions do not work.
• Sound varies with picture content.
• Right hand side of screen has a line.
• Does not start. Slight buzzing in loudspeaker. (service info for PHILIPS -20GR105079R)
• Picture is faint with hanover bars. (extract of circuit diagram attached)
• No sound. No picture. Faint motorboating noise.
• How to enter/exit HOTEL mode.
• Change of C2523.
• Sound increases intermittently or "pops", especially during bright scenes. (picture attached)
• Horizontal oscillator adjustment procedure.
• Green screen and at other times no tuning. (extract of circuit diagram attached)
• No audio.
• No audio. (20GR105079R PHILIPS repair tip)
• Blank or green raster. Flyback lines. Faint picture or normal picture. (+ extract of circuit diagram)
• Right side of picture discoloured.
• Stuck in standby. (part of circuit diagram displayed)
• Intermittent colour.
• Tuning drifts. only on certain channels.
• No +9V, line output stage is OK. (part of circuit diagram displayed)
• Programme channel search cannot be called up.
• To remove store/lock.
• Interference in audio. Interference in picture. (picture attached)
• Dead. Low level buzz from loudspeaker. (extract of circuit diagram attached)
• No line start up; +95 available; +9V is about 4.5V. (+ extract of circuit diagram)
• Error codes.
• Bright flash on screen and no picture or sound after a few minutes. (part of circuit diagram displayed)
• Line output stage only starts up for a short time. (extract of circuit diagram attached)
• 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)
• Dead. Strange noises from PSU/ line output transformer. (with circuit diagram extract)
• No functions. after start-up (intermittently).
• Line tearing, especially with bright scences. (picture attached)
• Production change to line drive. (with circuit diagram extract)
• To improve performance with prerecorded cassettes. (part of circuit diagram displayed)
• Dark picture. Audio OK .
• No voltage from PSU. (+ extract of circuit diagram)
• Buzzing from PSU. when cold. (picture attached)
• Searches for channels continuously. (+ extract of circuit diagram)
• Replacement of surface mounted diode 6637. (with circuit diagram extract)
• Standby just pulsing.
• Tuning procedure.
• No standby, humming and standby LED blinks.
• Picture displays lines and strange foldover effect at centre.
• No regulation. (picture attached)
• Cannot be programmed and search does not function. Only limited volume adjustable.
• Hums softly. (with circuit diagram extract) (20GR105079R tips)
• Unstable tuning.
• No SOP supply. (+ extract of circuit diagram)
• Set dead with just 5V on the 95V line. Standby LED is on but set won't start. (+ extract of circuit diagram)
• No connection for headphone.
• Colour amplitude and phase adjustment procedure.
• Line transistor 7528 blows within 1 sec. (+ extract of circuit diagram)
• White screen with flyback lines. Excessive brightness which increases until PSU switches to protection mode. (part of circuit diagram displayed)
• Sound motorboating when cold. (+ extract of circuit diagram)
• Intermittently dead. (picture attached)
• Change of C2523.
• Appliance will not switch on at times, but hums in the power supply section.
• Unstable tuning.
• Dead. Only standby-LED works. Responds to TURN ON command, but no image and no sound.
• Picture centering has shifted horizontally. No OSD.
• Green screen with flyback lines. Green oscillations. Noise as if HV leaky on picture tube base. (extract of circuit diagram attached)
• No tuning, no remote volume control. (part of circuit diagram displayed)
• Modification at line transformer position 5530. (extract of circuit diagram attached)
• Connection of a loop system to the TV.
• U743 tuner replacement. (+ extract of circuit diagram)
• Green screen with flyback line. No picture. OSD OK.
• Volume varies. depending on picture content. (+ extract of circuit diagram)
• Trips. (part of circuit diagram displayed)
• PAL colour amplitude adjustment procedure.
• Tripping. (part of circuit diagram displayed)
• Slight foldover at upper part of picture if appliance is switched on when cold. Fault disappears after few minutes. (+ extract of circuit diagram)
• No tuning bar when install button pressed and set not in hotel mode. (+ extract of circuit diagram)
• Volume goes to max. No volume control.
• Green picture. (extract of circuit diagram attached)
• No switch on after activating mains switch. Whistling noise. (with circuit diagram extract)
• Sound varies with picture content.
• No picture. No sound. Purring sound in loudspeaker. (extract of circuit diagram attached)
• Wavy picture. on the right.
• Streaks in picture. Picture pulls and rolls intermittently.
• Excessive HV. after a while.
• Rolling or jittering picture. (extract of circuit diagram attached)
• Power supply does not oscillate. (+ extract of circuit diagram)
• Very slight vertical foldover with interferences similar to EHT arcing, especially on very white scenes.
• Field collapse normally with blank picture. (part of circuit diagram displayed)
• Intermittent destruction of line o/p transistor. (+ extract of circuit diagram)
• No picture, sound ok but on turning up A1 control, frame collapse. (part of circuit diagram displayed)
• Picture only in two bars in upper screen section, the rest is dark. (extract of circuit diagram attached)
• 95V available. 9V is only 5.2V. Slight buzzing from loudspeakers.
• Line tearing. on lower half screen. (part of circuit diagram displayed)
• Chopper inoperative. (part of circuit diagram displayed) (PHILIPS - 20GR105079R information)
• No functions. Sound buzzes in loudspeaker. (extract of circuit diagram attached)
• Initial volume level is higher than maximum hotel mode setting.
• 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)
• Frame has shifted sideways. Appliance whistles and does not oscillate correctly. (+ extract of circuit diagram)
• Whistle.
• PSU switches off with load at U95V. (with circuit diagram extract)
• Initial volume level is higher than maximum Hotel mode setting.
• Vertical line. on the right half screen. (part of circuit diagram displayed)
• Stops working every 2 or 3 hrs. Only starts again after switching off and on again.
• Intermittently dead. after start-up.
• Memory loss. (picture attached)
• Does not start up. Light buzz from loudspeaker. Standby LED produces one brief blink.
• Line output transistor fails repeatedly. (+ extract of circuit diagram)
• +9V supply modification. (picture attached)
• R-Y and B-Y discriminator adjustment procedure. (with circuit diagram extract)
• No voltage from PSU, computer does not work. (with circuit diagram extract)
• Bright flash on screen. No picture or sound. (with circuit diagram extract)
• 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)
• Difficult startup. Rattling sound from line output trafo.
• Intermittent colour and intermittent dark vertical bar on picture.
• Excessive vertical size.
• LED switches on then off immediately.
• Turns on automatically. No RC or front panel controls.
• No functions. Hum in loudspeaker. No LED lit.
• Description of SMPS. (extract of circuit diagram attached)
• LED flashes once, then gurgles. (extract of circuit diagram attached)
• Sound varies with picture content.
• Change of C2523.
• No or intermittent start-up. (picture attached)
• Focus adjustment.
• No picture or sound but RCU works correctly. LED flashes when the handset is tried. (part of circuit diagram displayed)
• Fizzling sound from speakers at start-up and intermittently picture jagged.
• Poor synchronisation. when cold. (extract of circuit diagram attached) (20GR105079R tips)
• Does not start up at once from cold. (PHILIPS - 20GR105079R information)
• No colour.
• Local controls inoperative.
• Intermittent green picture, channels cannot be programmed. (+ extract of circuit diagram)
• Smeary, washed out picture with bent verticals. (extract of circuit diagram attached)
• Excessive horizontal size.
• Print with linearity coil pos. 5800. (service info for PHILIPS -20GR105079R)
• Limited volume. No channel search. (20GR105079R tip from PHILIPS)
• No picture. OSD OK .
• Low 5V to micro chip. (picture attached)
• Unable to tune or set volume in Prefix mode.
• Tuning drifts. only on certain channels (after a while).
• No channel search. No OSD. (with circuit diagram extract)
• Dim picture with Hanover bars visible. (part of circuit diagram displayed)
• Picture shifted horizontally. (part of circuit diagram displayed)
• Correction to service manual LOT winding.
• No freeze frame or intermittent freeze frame; no sound. (with circuit diagram extract)
• No tuning.
• The fuse and the bridge diodes in the power supply blow. (service info for PHILIPS -20GR105079R)
• Dead due to action of over voltage protection circuit.
• No picture (when cold).
• Picture separating line appears. Whistling.
• No line output stage. (with circuit diagram extract)
• No picture. TXT OK . (extract of circuit diagram attached)
• No function. Standby LED flashes briefly. (+ extract of circuit diagram)
• Dim picture with Hanover bars.
• Tuning drifts. (+ extract of circuit diagram)
• No tuning. only on certain channels.
• No picture. No sound. Switching on and off from Standby 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) (20GR105079R tip from PHILIPS)
• No audio.
• No start up from cold and humming.
• No vertical deflection. (extract of circuit diagram attached)
• No tuning possible, F2 appears on bottom of picture and S1 on top. (PHILIPS - 20GR105079R information)
• Crackling and popping in sound after a short time.
• No function. Motorboating from PSU. TV starts up randomly. Intermittent fault.
• Settings do not stay in position.
• Hotel Mode activates by itself. (picture attached) (PHILIPS - 20GR105079R information)
• How to de-activate Hotel-Mode:
• No function. When switching on with RC, standby LED lights up. (part of circuit diagram displayed)
• Vertical vibration in cold condition of set. (PHILIPS - 20GR105079R information)
• Delay RF AGC adjustment procedure.
• Two lines going around. (extract of circuit diagram attached)
• Dead. Low frequency noise on sound.