MTS21BTX / MELECTRONIC [TV]

• Protection mode activated. LED blinks . (with circuit diagram extract)
• 1cm horizontal picture foldover at top of screen. 6 white horizontal lines, 2 blue thin lines, 2 green and 2 red on top of screen. No TXT. OSD rolls over. (with circuit diagram extract)
• White and black vertical stripes in the entire picture. (picture attached)
• Bottom of picture is black and top is distorted. Low audio volume. (MTS21BTX MELECTRONIC repair tip)
• No picture, sound OK. Glaring white stripes at upper picture edge. (extract of circuit diagram attached)
• Flyback lines. at top. (picture attached)
• No start-up. after warm-up. (with circuit diagram extract) (MTS21BTX MELECTRONIC repair tip)
• Poor horizontal synchronisation. Poor vertical synchronisation. after warm-up.
• Noise in standby. (extract of circuit diagram attached)
• PSU attempts to start up. LED flashes. (+ extract of circuit diagram)
• Switches to standby. after a while. (with circuit diagram extract) (MTS21BTX tips)
• Incorrect picture with scart. Loss of synchronisation.
• Noise. Red LEDs flash.
• LED flashes rapidly at startup, then goes to standby. (with circuit diagram extract)
• Only contours are visible, then picture becomes red. Noisy sound.
• Setting the reference picture. (with circuit diagram extract)
• In PAL/SECAM position in the automatic PB of a video containing PAL and SECAM recordings, SECAM is not always recognised.
• Hanover bars. I.e. alternately every centimeter one white stripe. (MTS21BTX tips)
• After few days appliance loses all picture geometry data and station memory. Then everything must be readjusted. When readjusted picture is OK. After a while failure appears again.
• Distorted picture. Hum bar runs through. Saw tooth clefts approx 4cm on the left and right.
• Adjusting the audio setting. (part of circuit diagram displayed)
• Enter service mode.
• No start-up. Standby LED lit . (picture attached)
• Lower half of the picture is missing (black). Colour runs through. (picture attached)
• Black screen. Two lines on top of picture.
• No vertical deflection. intermittently. No picture. intermittently. (picture attached) (service info for MELECTRONIC -MTS21BTX)
• Picture appears slowly. (part of circuit diagram displayed)
• Thin black stripes across entire picture. (+ extract of circuit diagram)
• Shuts down (intermittently).
• Manual tuning.
• Bright picture with flyback lines. Sound OK. Program switch over OK. No sound and no program switch over after a while. Switches off after approx 10 secs.
• No line drive. (picture attached) (service info for MELECTRONIC -MTS21BTX)
• E/W fault. (picture attached)
• Pincushion distortion. (MELECTRONIC - MTS21BTX information)
• Excessive horizontal size. E/W fault. (picture attached)
• Green image at appliances with SQ CRT. (with circuit diagram extract)
• Two inch band of lines at middle of screen with two inch flyback/foldover at top. (picture attached)
• Dead. (+ extract of circuit diagram)
• Switches to standby. after start-up. (with circuit diagram extract)
• Dead. after lightning strike. (with circuit diagram extract)
• Moire pattern. intermittently.
• Squealing noise. after a while. (extract of circuit diagram attached)
• Green picture. E/W fault.
• BC337/25 fails after short time. (part of circuit diagram displayed)
• No line drive. Audio OK .
• No PIP. (MTS21BTX tips)
• Reduced vertical size.
• Blank raster. Flyback lines. (picture attached)
• Flyback lines. (part of circuit diagram displayed)
• Intermittently page number cannot be typed in TXT mode or appliance cannot be switched back to TXT mode.
• Intermittently no standby or cannot be switched on from standby. (extract of circuit diagram attached)
• Flag effect and distortion of the verticals in top part of screen. (extract of circuit diagram attached)
• Adjusting U1. (extract of circuit diagram attached) (MELECTRONIC - MTS21BTX information)
• Personal preference on picture menu inoperative. Sound menu OK.
• Horizontal black bands plus areas with scan lines too far apart.
• Picture width can not be adjusted through service-menu, it is too large. (part of circuit diagram displayed)
• Black vertical lines in picture. (part of circuit diagram displayed)
• Washed out picture. (extract of circuit diagram attached)
• Horizontal colourful stripes in lower picture section, after a short while picture starts to roll horizontally. (with circuit diagram extract)
• Failure of ICs NH01, NH02 and NH03. (extract of circuit diagram attached)
• Picture is only visible approx 13cm from the right to the left, remainder of the screen is black. In TV and TT operation the same thing occurs; sound and picture menus are o.k. (part of circuit diagram displayed)
• Reduced horizontal size. No E/W correction. (+ extract of circuit diagram) (MTS21BTX MELECTRONIC repair tip)
• Black diagonal lines from top to bottom of picture. (extract of circuit diagram attached) (MTS21BTX tips)
• Only standby, standby LED flashes quickly, STEREO lamp flashes slowly.
• No picture. Audio OK . (picture attached)
• No function, only chirping. Starts up intermittently when RC is kept pressed. (part of circuit diagram displayed)
• Vertical amplitude reduced by 3cm at top of screen with white lines. (part of circuit diagram displayed)
• No start-up. intermittently. (with circuit diagram extract)
• Poor start up of the PSU and LED flashes.
• In AV or RGb mode sync poor. (with circuit diagram extract)
• Picture flashes. Vertical scan distorted. (MTS21BTX tip from MELECTRONIC)
• No OSD. (part of circuit diagram displayed)
• Horizontal stripes in the entire picture. Circle has sinusoidal distortion. (picture attached) (MTS21BTX MELECTRONIC repair tip)
• LED blinks. PSU starts. (with circuit diagram extract)
• Double lines all over the screen.
• 6cm band in upper part like a fold with lines on 1/3 of picture. Band switches from black and white to colour. (MTS21BTX tips)
• No colour in PB (automatic in PAL/SECAM position) via the scart of a cassette recorded in SECAM. (picture attached)
• Dead. Standby LED flashes . (with circuit diagram extract)
• Noisy power supply then goes to standby, usually after 1 hr.
• Can not be switched on from standby. LEDs flash and audio LED blinks. (extract of circuit diagram attached)
• No picture. SCART output OK. Audio, OSD and TXT OK.
• No recording from fitted SAT in standby. (+ extract of circuit diagram)
• APS function sometimes does not work. Some channels are left out and not stored. (picture attached)
• OSD jitters. (extract of circuit diagram attached)
• No E/W correction. (part of circuit diagram displayed)
• 150V voltage is missing at BU.
• Goes to standby after two-three mins then powers down. (+ extract of circuit diagram)
• Line output stage oscillates.
• Disable hotel mode.
• Memory loss. (+ extract of circuit diagram)
• E/W fault. Clicking noise. Shuts down. after a few seconds. (extract of circuit diagram attached)
• Dead. Standby LED lit . (+ extract of circuit diagram)
• No PSU secondary voltages. (MTS21BTX tip from MELECTRONIC)
• Picture foldover on upper edge with colourful flyback lines. (with circuit diagram extract)
• Black line at the right of the screen (part of circuit diagram displayed)
• Red picture. Flyback lines. intermittently.
• Standby LED flashes quickly in Standby, STEREO flickering, starts intermittently after 15 secs, then hum in picture.
• Vertical stripes on the whole screen. (with circuit diagram extract)
• Poor vertical lines, which become intermittently stronger pull in picture (aerial signal). OK via scart. (picture attached)
• Sound distorted in STEREO NICAM L. Appliance switches to mono at random then back to stereo again. Crackling. Intensity of fault depends on RF reception level.
• Horizontal black lines and foldover at the top of the picture, even in AV and specially when cold. (+ extract of circuit diagram)
• Power supply start up incorrectly.
• Stuck in standby. LED blinks . (picture attached)
• Horizontal line. in the centre. (picture attached)
• Chirping. at start-up.
• No audio. (extract of circuit diagram attached)
• No drive.
• No TXT. (picture attached)
• Strong squealing. Black and white horizontal bars. (picture attached)
• Poor correction. (picture attached) (service info for MELECTRONIC -MTS21BTX)
• No function. Standby LED lights up for a short time. (picture attached)
• Moire in cable system.
• No picture. No sound. Channel switch-over OK.
• Driver transistor (BC337-25) is defective. (part of circuit diagram displayed)
• Switches to protection mode. (with circuit diagram extract)
• Thick , wide stripes in vertical deflection on all programs. (+ extract of circuit diagram)
• Venetian blind effect. (+ extract of circuit diagram) (MTS21BTX tip from MELECTRONIC)
• Setting the AGC (for mulit standard appliances) (extract of circuit diagram attached)
• Intermittently trips. Noisy PSU.
• Switches by itself to TXT. (part of circuit diagram displayed)
• Crackling audio. on the right. (+ extract of circuit diagram)
• Horizontal narrow lines. TXT OK. (+ extract of circuit diagram)
• Dark picture. OSD OK . (with circuit diagram extract)
• Vertical lines. on the right. (+ extract of circuit diagram)
• Picture shifted to the left. (picture attached)
• Does not switch to standby. Standby LED lit . Chirping. (+ extract of circuit diagram)
• Black vertical line down right hand side of picture. (+ extract of circuit diagram)
• No functions. Standby LED lit . (+ extract of circuit diagram)
• Venetian blind shaped horizontal lines.
• Intermittently red picture (sometimes more, sometimes less).
• Black stripes. (picture attached)
• Doesn't start up, standby LED lights, LED flashes 2 times.
• No contrast. No synchronisation.
• Shuts down. after start-up. (with circuit diagram extract) (MTS21BTX MELECTRONIC repair tip)
• No function. Only standby LED. End stage IC ( TDA7262) on the Surround print smokes. No diagram is present.
• SECAM is not recognised during simultaneous reception of PAL (ASTRA) and SECAM (TELECOM 2A or 2B) satellite signals via scart (automatic in PAL/SECAM position). (part of circuit diagram displayed)
• Reduced vertical size at bottom. (+ extract of circuit diagram)
• Picture shifted to the right. (part of circuit diagram displayed) (MELECTRONIC - MTS21BTX information)
• Popping sound from the HV. Intermittently shutsdown.
• Switches to standby. intermittently. (+ extract of circuit diagram)
• No focus. (extract of circuit diagram attached) (MTS21BTX MELECTRONIC repair tip)
• Reduced horizontal deflection.
• Dark picture.
• In mono appliance switches to STEREO and sound hisses.
• No picture. Black screen. Audio OK .
• VK22 (BC337) breaks down after 10 mins. Sound OK, picture disappears.
• Vertical foldover at top. (extract of circuit diagram attached)
• No switch on. Stereo LED flashes.
• Mains fuse and transistor are defective (with circuit diagram extract) (MELECTRONIC - MTS21BTX information)
• When trying to switch on LED flickers and squealing is heard from LT and PSU. Standby LED on. (extract of circuit diagram attached)
• No start up, vertical line LED flashes under less volume. If you try to start up by pressing P, SAT LED flashes. (MELECTRONIC - MTS21BTX information)
• Picture available, all colours are transposed.
• Vertical lines. (with circuit diagram extract)
• No start-up from standby with RC. (picture attached)
• CK51 (8700pF) frequently fails. (part of circuit diagram displayed)
• No colour when Canal Plus is tuned in with decoder (in automatic PAL/SECAM position). (+ extract of circuit diagram) (MTS21BTX tips)
• No symbols in OSD menu. Functions are not carried out. Limited volume control. (extract of circuit diagram attached)
• No functions. No display. (+ extract of circuit diagram)
• Arcing in picture. Blank raster. intermittently. (+ extract of circuit diagram) (MTS21BTX tip from MELECTRONIC)
• Power supply doesnt start, standby LED OK, blinks when pressing p+/-, no functions.
• Setting the automatic search.
• No picture. intermittently. Audio OK . (extract of circuit diagram attached)
• Vertical output stage oscillates. (extract of circuit diagram attached)
• Strong chirping sound from line transformer. Functions OK.
• Chirping. LED blinks .
• Vertical stripes on the left side of screen and interference on channel 02. (picture attached)
• Dead. No line driver. Plopping noise from speakers.
• When appliance is switched on, LED flashes briefly, then goes off. (picture attached)
• Dark lines in picture. (part of circuit diagram displayed)
• Trips then powers down once or twice daily. (with circuit diagram extract)
• Picture is blank for too long at program switch over. (extract of circuit diagram attached)
• Vertical linearity defective. Lines too separated. Black horizontal stripes on certain areas of screen. (picture attached)
• Turns itself OFF (in low power standby) or cannot be turned on when operating temperature too high. (picture attached) (service info for MELECTRONIC -MTS21BTX)
• Standby LED flashes. (picture attached)
• No TXT. OSD rolls over. Horizontal picture foldover over 1 cm at top of screen. 6 horizontal white stripes, 2 green and 2 red at top of screen. (part of circuit diagram displayed)
• Picture shifted vertically. (+ extract of circuit diagram)
• Dead. LED is red . (extract of circuit diagram attached)
• Stuck in standby. Power LED lit . (+ extract of circuit diagram)
• Moire effect with some UHF channels (eg. channel 33). (part of circuit diagram displayed)
• No start-up. LED is red . (picture attached)
• Arcing in picture. (part of circuit diagram displayed)
• No picture. intermittently. Dark picture. after a while. (extract of circuit diagram attached)
• Line driver transistor VK22 blows few mins after switch on. (+ extract of circuit diagram)
• Picture appears and becomes constantly fainter. TV then fails.
• Adjacent channel distortion/ moire e.g. S10/E05. (extract of circuit diagram attached)
• Noise in audio. intermittently. (picture attached)
• Switches on from standby. Both LEDs flash in standby. (picture attached)
• Drive transistor (BC337) fails after operation. (part of circuit diagram displayed) (MTS21BTX tips)
• No RC functions. (picture attached)
• Strange pattern over screen. Random black lines. (with circuit diagram extract) (service info for MELECTRONIC -MTS21BTX)
• Line tearing. intermittently. (part of circuit diagram displayed)
• Picture is folded over at top and white stripes in upper picture third. (picture attached)
• No function. Standby LED lights up or switches on and can no longer be operated after a short time. (extract of circuit diagram attached)
• Focus adjustment. (extract of circuit diagram attached)
• No colour. (picture attached) (MTS21BTX tip from MELECTRONIC)
• No vertical deflection. (+ extract of circuit diagram)
• Starts up briefly, switches off immediately. RK70 goes warm, if it is started up many times one after another. (MTS21BTX tips)
• No HV. Audio OK . (picture attached)
• Intermittently no horizontal programs in SAT reception.
• Red LED flashes, if you want to start appliance with RC. However appliance does not go on. (extract of circuit diagram attached)
• No scanning. (part of circuit diagram displayed)
• Microprocessor stuck. (+ extract of circuit diagram)
• Switches off by itself. depending on picture content.
• Vertical bar. on the right. (with circuit diagram extract)
• Streaked picture at switch on and when cold.
• Vertical collapse. (with circuit diagram extract) (MTS21BTX tip from MELECTRONIC)
• Dead. PSU runs (lamp test). (part of circuit diagram displayed)
• Bright picture. (extract of circuit diagram attached)
• Adjusting the menu.
• Snow in picture.
• Power supply tripping. LEDs flickers.
• No vertical synchronisation.
• No picture. on lower half screen.
• Cross talk. (extract of circuit diagram attached)
• No channel switchover with RC or keyboard.
• Dark picture. after a few minutes. (picture attached)
• Horizontal lines missing on raster. Height greater then normal. Picture does not fold over. (extract of circuit diagram attached)
• Blank raster. Audio OK .
• Line transistor S/C or leaky. (picture attached)
• If it is switched to standby, LED still flashes approx. 1 min, until it is switched properly to standby. (part of circuit diagram displayed)
• Comes on for a short time. (+ extract of circuit diagram)
• Excessive brightness. Flyback lines. Switches off by itself. (+ extract of circuit diagram)
• Black screen. White line at top of picture. Audio OK .
• At multinorm and SAT appliances OSD jitter without signal. (with circuit diagram extract)
• Vertical out stages IC NS10 (TDA8350Q) get defective after short operating time. (with circuit diagram extract)
• No start-up. Standby LED does not light.
• Horizontal collapse. (+ extract of circuit diagram)
• How to access alternative SERVICE mode.
• Stuck in standby. (with circuit diagram extract)
• G2 and colour temperature adjustment.
• Very dark or black screen. Possibly, blurred picture, when switching off, a dot is visible in the centre of the screen. (+ extract of circuit diagram)
• Picture collapses to horizontal stripes. (+ extract of circuit diagram)
• Does not switch on. Power supply crackles. (MTS21BTX tip from MELECTRONIC)
• Blank screen, OSG scrolling and half frame. Sound OK. (extract of circuit diagram attached)
• Chirping. Shuts down. after a few minutes. (extract of circuit diagram attached)
• Intermittent failure to start up from standby. Blocks every now and then. (part of circuit diagram displayed) (MTS21BTX MELECTRONIC repair tip)
• PSU tries starting up then stops. (extract of circuit diagram attached)
• PSU transistor V025 (BUF405XI) immediately defective at start-up.
• Pulsating vertical fold and flyback lines on centre of screen. (+ extract of circuit diagram)
• Horizontal driver VK22 (BC33725) fails every now and then. (picture attached)
• No raster.
• Mains LED lights up. No switch on with RC. (extract of circuit diagram attached)
• Disable child lock.
• No picture (when cold). Audio OK .
• Dead. LED flashes 3 times then remains on. (extract of circuit diagram attached) (MTS21BTX MELECTRONIC repair tip)
• APS search does not save all programes. (+ extract of circuit diagram)
• Slow start-up.
• No start-up. Standby LED flashes . (with circuit diagram extract)
• Interference in picture at high signal level in VHF area. (part of circuit diagram displayed)
• Protection mode activated. (MTS21BTX tips)
• No functions. Red LED blinks. (with circuit diagram extract)
• Clamping error at RGB feed. (picture attached)
• PSU pulsates. (with circuit diagram extract)
• White screen. after a while. Shuts down. (picture attached)
• PSU blows or cuts out. (+ extract of circuit diagram)
• No start-up from standby. when cold.
• Wavering in upper part of picture (similat to horizontal jitter effect) only via aerial and some channels.
• Small luminous spot for 4 sec at switch off.
• Dark picture. after a while. TXT OK .
• Only loud crackling at switch on, no other functions.
• Red LED turns on. (+ extract of circuit diagram)
• Does not start with power switch. Start via RC and user control OK. (part of circuit diagram displayed)
• Necessary change when there is a fault on one of the 3 colour tracks of the tube neck circuit. (picture attached)
• No horizontal drive. Both LED are flashing. (extract of circuit diagram attached)
• No picture. intermittently.
• No HV. (picture attached) (MELECTRONIC - MTS21BTX information)
• No function. Standby- and stereo-LED flash. (extract of circuit diagram attached)
• Switches to standby approx 20 times per hour. (extract of circuit diagram attached)
• TDA8350 and TDA8366 fail again after a short time. (part of circuit diagram displayed)
• Appliance intermittently stuck when turned on from mains switch. (+ extract of circuit diagram)
• No picture (after a while).
• BU blows randomly.
• Switches on by itself. (part of circuit diagram displayed)
• Reduced vertical size at top. (picture attached) (MTS21BTX MELECTRONIC repair tip)
• Picture is distorted after replacing the TDA8350Q at the top part of the picture. Flyback lines.
• No picture. No TXT. Audio and OSD OK . (with circuit diagram extract)
• No OSD display or OSD jitters severely in vertical direction.
• Vertical fault. Upper picture edge is folded down approx 5cm with fine coloured flyback lines.
• When coming out of standby, EHT increases for a short time then appliance goes back into standby. (picture attached)
• Double picture. (picture attached)
• PSU blown. (service info for MELECTRONIC -MTS21BTX)
• Poor picture. Snow in picture. intermittently.
• Switches to standby or switches from TXT to TV mode. (+ extract of circuit diagram)