ALPHA2 / PANASONIC [TV (chassis)]

• Controls go faulty after a while. (extract of circuit diagram attached)
• No picture. (part of circuit diagram displayed)
• Line BU fails at irregular intervals.
• Stripes, double lines and distorted picture. (with circuit diagram extract)
• Loss of text sync/no channel identification lock. (with circuit diagram extract)
• No raster. (+ extract of circuit diagram)
• Intermittently flickers and powers down. (picture attached)
• Tuning drifts (intermittently).
• After 3-4 hours a faint line appears at the top of the screen. (extract of circuit diagram attached)
• Dead. Channel display on . (picture attached)
• Noisy NICAM.
• Reduced vertical deflection.
• After turning on the set goes to standby but the LED will not light. (extract of circuit diagram attached)
• Muted audio. (part of circuit diagram displayed)
• No audio for 10 mins. (extract of circuit diagram attached)
• Doesn't switch completely off from standby. Program display disappears. Standby LED lights.
• Excessive brightness. No colour. (+ extract of circuit diagram)
• Squeals at switch on then dies except for channel number indicator. (extract of circuit diagram attached)
• Flyback lines. at top (intermittently). (with circuit diagram extract)
• Pincushion distortion.
• No synchronisation. No picture. Shuts down. (+ extract of circuit diagram)
• Extreme field distortion. (picture attached)
• Power supply hissing for approx 3 secs at start up and goes to safety mode. Programme display visible all the time.
• No control possible after 10 secs.
• Excessive horizontal size. E/W fault. (part of circuit diagram displayed)
• TXT flashes on screen after 1 hour. Loss of sync on TXT. (picture attached)
• No picture. No sound. Standby LED lights up. If switched on with the RC, channel display appears and can be switched over. (PANASONIC - ALPHA2 information)
• Poor colour. intermittently. (part of circuit diagram displayed)
• Picture width quivers.
• Snow on picture and low gain. (picture attached)
• No synchronisation. in TXT. (part of circuit diagram displayed)
• Poor picture, contrast being very low irrespective of the customer control setting. (part of circuit diagram displayed)
• Text fault. Channel flag is present and stable, but there are no bar graphs for colour, sound etc. When the set is switched to the teletext mix mode, a perfect text display is produced. (picture attached)
• Looks like text line at top 3" of picture.
• Resistor R802 always blows. (extract of circuit diagram attached)
• Intermittently goes dead with loud whistling. (part of circuit diagram displayed)
• No line drive. (extract of circuit diagram attached)
• No picture. No sound. Raster OK. CRT-filament lights, blocked on channel 0.
• Picture folds over at sides. Then a vertical bar remains in the picture.
• No functions. Display OK . (with circuit diagram extract)
• Squealing from PSU. (part of circuit diagram displayed)
• Picture is shifted inwards at the right side. Fault occurs after approx 15 mins.
• No picture. Audio OK . (with circuit diagram extract)
• Dark picture via S-VHS input.
• Chirping. Display OK .
• LED briefly lit after switch on, then progr. 1 or 2 starts. No other entries possible. No picture and no sound.
• Line BU is S/C.
• No synchronisation. (part of circuit diagram displayed)
• Horizontal lines in top half of picture when cold. Entire picture trembles.
• E/W fault (intermittently). (picture attached)
• Defective or erratic oscillating colours.
• Whistling in the power supply, depending on the load.
• Buzzing from PSU.
• Red, green or blue picture. (part of circuit diagram displayed)
• PSU pulsates.
• No convergence.
• Powers up momentarily. (with circuit diagram extract)
• Horizontal lines at the top part of the picture. OSD insertions slowly run vertically through the picture.
• Intermittent colour after a few hours, flickers off then on again. On maximum colour setting line paired more so on reds. (extract of circuit diagram attached)
• Flashover voltage in PSU.
• No HV.
• No TXT, unstable channel number. (extract of circuit diagram attached)
• RC problems. (picture attached)
• Hissing noises after switch on
• No display. No functions. No audio, only a dark blank raster. (picture attached)
• Switches to protection mode (after a few seconds). (with circuit diagram extract)
• Horizontal green and magenta bars running through picture. (+ extract of circuit diagram)
• TV starts up, EHT starts up then cuts out. Channel display remains.
• Whistling from PSU. intermittently. (picture attached)
• No voltages from PSU.
• Cuts out when warm. Works well without the cabinet.
• Distorted audio. on the left. (extract of circuit diagram attached)
• Repeated failure of field output chip IC451 (AN5521).
• White bar (approx. 10cm) on top of the picture.
• No sound for the first half an hour. (+ extract of circuit diagram) (ALPHA2 tip from PANASONIC)
• Bright red raster.
• One colour missing.
• Intermittently no line hold. (picture attached)
• Intermittent black lines on right hand side of picture. (part of circuit diagram displayed)
• Intermittent or no colour. (with circuit diagram extract)
• Set operated perfectly for an hour, then the sound would mute and controls wouldn't work. (picture attached)
• Appliance squeaks very loud. No picture. No sound.
• IC801 intermittently blown. (with circuit diagram extract)
• No blue. after a while. (part of circuit diagram displayed)
• Line output stage transistor fails after a while.
• Lines in picture. at bottom. (extract of circuit diagram attached)
• Line output transistor fails repeatedly. (picture attached)
• Chirping. Line tearing. after a while.
• EHT fails within 2 secs after switch on.
• Set only works after several attempts to switch on. Switch is ok. (+ extract of circuit diagram)
• Power supply overloaded and squealing. (service info for PANASONIC -ALPHA2)
• No sound and picture. Channel switch over OK. (ALPHA2 tip from PANASONIC)
• Switches to standby.
• Colour varies. (+ extract of circuit diagram)
• The sound is normal but only a poor washed out picture, i.e. no contrast. The picture can sometimes hardly be seen, consisting of just a slight movement of shaded greys on the raster. Or the screen might be completely blanked out. (picture attached) (PANASONIC - ALPHA2 information)
• Dead. Whining. Channel numbers OK. (+ extract of circuit diagram) (ALPHA2 tip from PANASONIC)
• Switches off by itself. after a few minutes.
• Picture right area is darker (shadowed) than rest of screen.
• Stations cannot be tuned in properly. (with circuit diagram extract) (PANASONIC - ALPHA2 information)
• Chirping. (picture attached)
• Shuts down (intermittently). (+ extract of circuit diagram)
• No vertical synchronisation.
• Picture pulls to right hand side. (extract of circuit diagram attached)
• Picture sync goes then picture disappears. (with circuit diagram extract)
• Poor picture. Low contrast. (part of circuit diagram displayed)
• Tries to switch on for 1 sec and then stops. LED and channel no. remain lit. (+ extract of circuit diagram)
• After working for a couple of minutes, picture sync is lost then the screen goes black. Power supply shuts down and squeals. (+ extract of circuit diagram)
• No sync on OSD or text. Usually no text at all, just moving blank screen. (+ extract of circuit diagram)
• Black screen. Display OK .
• Vibrating picture and horizontal lines. (picture attached) (PANASONIC - ALPHA2 information)
• East to West bowing. (extract of circuit diagram attached)
• No E/W correction.
• Poor frame scan. (part of circuit diagram displayed)
• Intermittent colour, sometimes flashes orange, green then blue then disappears altogether. (extract of circuit diagram attached)
• Horizontal lines. Unstable picture.
• No channel storing. (part of circuit diagram displayed)
• Reduced vertical size.
• Red picture. Flyback lines.
• Frame distortion, line doubling. (+ extract of circuit diagram)
• When warm picture shift to the right then line oscillation is defective.
• Mainly dark screen with zigzag lines. Some signs of chroma flash up intermittently and the sound is muted. (+ extract of circuit diagram)
• TV goes into safety mode at switch-on.
• No picture (intermittently). Audio OK . (with circuit diagram extract)
• No picture, no high voltage, power supply squeaks, sound present. (part of circuit diagram displayed)
• Unstable OSG.
• After approx 1 hour the picture becomes approx 3cm too small at the right edge.
• Fizzle noise after turning on.
• Comes on then switches to standby leaving three blobs of colour in the centre of screen. (with circuit diagram extract)
• Shuts down (after a few seconds). Squealing from PSU.
• Line doubling/distortion/striations. (with circuit diagram extract)
• Horizontal dark bars across the picture. (extract of circuit diagram attached)
• Squealing from PSU (intermittently).
• Fuzzy picture. (picture attached)
• Dead. (+ extract of circuit diagram)
• Exits standby and stops. Channel no. remains lit.
• Reduced horizontal size. intermittently. (with circuit diagram extract)
• Squeal from PSU. Channel LED OK.
• No picture. Squealing from PSU. Audio OK . (+ extract of circuit diagram)
• No NICAM sound.
• Unlocked colour. (part of circuit diagram displayed)
• Starts up, then no function from remote or main controls.
• Q551 fails again after a short time.
• No luminance but chrominance in the display.
• Bright lines on screen. (+ extract of circuit diagram)
• Vertical distortion. Horizontal deflection with vertical stripes and pairing effect.
• Intermittent colour. (+ extract of circuit diagram)
• Video seems off tune. (part of circuit diagram displayed)
• Vertical stripes like strings of pearls in picture.
• Failure of line output transistor Q551 (2SD1441RL). (with circuit diagram extract)
• Approx. 5 horizontal bars from top of picture spaced about 8mm apart gradually fading out. note; If height reduced fault worsens and picture jitters with even more bars. (with circuit diagram extract)
• No or poor contrast. (extract of circuit diagram attached)
• Switches off. No control possible. Program display OK.
• Blank raster. No RC functions. (extract of circuit diagram attached)
• After a few hours edges bow. (picture attached)
• Extremely weak contrast, controls have no effect. (+ extract of circuit diagram)
• Faulty TXT. (part of circuit diagram displayed)
• Whistling at start-up. Programme number display functions.
• Vertical collapse. (part of circuit diagram displayed)
• Dark picture.
• Picture vibrates. Black lines in picture, especially in top half. (extract of circuit diagram attached)
• Line output stage is defective. Line BU is defective. After replacement the same fault reoccurs. (+ extract of circuit diagram)
• Appliance fizzes then width comes in. (+ extract of circuit diagram)
• From standby will not switch on, LED display comes on. Standby LED stays on. (extract of circuit diagram attached)
• Strong chirping after switch on. No channel appears.
• Picture twists horizontally causing E/W distortion when warm.
• E/W fault. (with circuit diagram extract)
• Line output transistor S/C, R567 O/C and D854 S/C. (part of circuit diagram displayed)
• Poor vertical line across right side of picture.
• Reduced horizontal size. (extract of circuit diagram attached)
• Line output transistor fails repeatedly. after start-up.
• Picture not locked and/or no text, will lock if the text button is pressed or set is put into AV then back to TV.
• No picture (intermittently). (extract of circuit diagram attached)
• Power supply does not start up. Standby LED does not light up.
• No light (Y signal) in reception via tuner nor via SCART input. TXT and OSD OK.
• If left on teletext, white beating bars appear over text.
• No horizontal oscillation signal. Whistle from PSU often.
• Lines in picture.
• No TXT; picture unlocked until TXT button pressed or set to AV position. (+ extract of circuit diagram)
• Black screen.
• Line transistor BU508D fails again straight away immediately after switch on. (extract of circuit diagram attached)
• After about half an hour's use and when a different channel is selected, the channel information derived from the text flashes unlocked across the screen. There is also loss of teletext synchronisation. (+ extract of circuit diagram)
• No function. Loud cracking from the main PSU.
• PSU whistles.
• Bad distortion, line doubling and horizontal striations were all present at once. (with circuit diagram extract) (PANASONIC - ALPHA2 information)
• Poor picture and colour halo at sides of screen. (ALPHA2 PANASONIC repair tip)
• Picture and sound are missing, channel change ok.
• Severe noises form PSU for approx. 5 sec, then switches off . Program display remains (PANASONIC - ALPHA2 information)
• No brightness. Audio OK .
• Flyback lines. at top.
• Intermittent colour and insufficient colour at max setting of colour control. (part of circuit diagram displayed)
• Picture bows in from the sides intermittently or permanent. (picture attached)
• Ragged raster. Picture lines run through each other.
• No functions.
• Smearing in picture.
• Tuning is slightly off. Dark screen with zigzag lines. Intermittent flashes of chroma and sound mutes.
• Picture width quivers. Intermittently picture drops out.
• At switch on picture is snowy, flashes, then OK. (picture attached) (ALPHA2 tip from PANASONIC)
• No audio. No picture. (picture attached)
• Blue background on teletext and OSG but picture OK. (+ extract of circuit diagram)
• Dead, channel number lit; may come on for short time then turns off but neon display remains. (picture attached)
• Intermittent colour and saturation is low. (picture attached)
• Power supply squeaks, speaker hums and twitters. (+ extract of circuit diagram)
• Starts up, line transformer starts up then cuts out. Channel display remains.
• Blank raster. OSD OK .
• Memory IC defective. (PANASONIC - ALPHA2 information)
• Poor synchronisation. (picture attached)
• No picture or sound intermittently. Program display is present.
• Cannot be switched properly to standby, sound muted after pressing standby key on RC, programme display disappears and standby LED lit, picture still present.
• Intermittent whistle. (part of circuit diagram displayed)
• Only program display. No standby display (ALPHA2 tip from PANASONIC)
• Dent in right side of picture after a prolonged operating time (after 1.5hrs). After cooling down picture OK again. (with circuit diagram extract)
• Faint line down right hand side of screen. (extract of circuit diagram attached)
• Dark picture with test lines when cold.
• Appliance blocks occasionally, all basic values are set to minimum, all additional displays (stereo, three-dimensional sound etc.) light up. If the main switch is switched off then on again then everything is ok.
• Shuts down. after a few minutes. (+ extract of circuit diagram) (ALPHA2 tips)
• No sound, blank raster and unlocked channel numbers.
• Blank raster. Audio OK . (PANASONIC - ALPHA2 information)
• Q551 running very hot and blowing R567 after approx. 4hrs. (with circuit diagram extract)
• No TXT. (extract of circuit diagram attached)
• No tuning.
• Foldover at top and picture vibrates.
• Q552 (2SD1441) S/C. (+ extract of circuit diagram) (service info for PANASONIC -ALPHA2)
• Appliance hisses. No high voltage. Standby voltage is present. (picture attached)
• No text although the channels flags are normal. (part of circuit diagram displayed)
• Picture full with stripes, when adjusting the horizontal size the fault disappears.
• No vertical deflection. (part of circuit diagram displayed)
• Sound muting and no function of the controls after an hour approx. (part of circuit diagram displayed) (ALPHA2 tip from PANASONIC)
• Dead after a burst of EHT.
• Distorted audio. (with circuit diagram extract)
• Power supply running, but no HT on line output transistor.
• White flashes in picture and/or intermittent operation and/or horizontal sync dropout intermittently.
• No start-up. LED blinks .
• Stuck in standby. (part of circuit diagram displayed)
• No or intermittent loss of video signal. (extract of circuit diagram attached)
• Picture turns red after a short while in operation.
• Lines in picture. at top. (picture attached)
• Set dead apart from a whine from the power supply. (with circuit diagram extract) (ALPHA2 tip from PANASONIC)
• Erratic colour. (extract of circuit diagram attached)
• Power supply starts up, pulsates 3-4 times and then goes into standby
• Tuning goes off with ticking. (extract of circuit diagram attached)
• Saturated picture in red, green or blue. (extract of circuit diagram attached)
• No picture. Flyback lines. No audio. Raster OK .
• Switches off by itself. after warm-up. (extract of circuit diagram attached)
• Screen doesn't light up. Sound OK. (PANASONIC - ALPHA2 information)
• After about four hours operation the safety resistor R567 in the HT feed to the line output stage blows. This is accompanied by various shrieks and whistles. (part of circuit diagram displayed)
• Dark screen.
• No luminance signal. Chroma is present.
• Loss of text sync after 1 hour. (part of circuit diagram displayed)
• Fine lines on top of picture. (service info for PANASONIC -ALPHA2)
• White lines on top of screen. (PANASONIC - ALPHA2 information)
• Intermittently picture impairment with noise.
• Intermittently dead. (part of circuit diagram displayed)
• Comes on for a short time. (+ extract of circuit diagram)
• No picture. No sound. Squeals. Channel numbers lit. (extract of circuit diagram attached)
• PSU whistling. Channel indicator OK.
• Intermittent whistling noise when set first switched on.
• Switches to protection mode (after start-up). (picture attached)
• Coloured bars across screen. (with circuit diagram extract) (service info for PANASONIC -ALPHA2)
• Intermittent line output stage operation. (with circuit diagram extract)
• Horizontal tearing.
• No start-up. Squealing from PSU. (+ extract of circuit diagram)
• Intermittently picture disappears leaving dark grey raster. (+ extract of circuit diagram)
• No start-up (intermittently). (with circuit diagram extract)
• No text, channel flag drifting. (part of circuit diagram displayed)
• Line tearing. Pincushion distortion. on the right. (picture attached)
• Switches to standby (after start-up). (picture attached)
• No bar graphs. No TXT. TXT OK in mix. (part of circuit diagram displayed)
• No sound. No picture. Whistle when pressing mains switch.
• Faulty teletext. Channel flag and bar graphics drift aimlessly across the screen while the text is erratic with flashing white lines on the background. (extract of circuit diagram attached)