52KV2526 / SIERRA [TV 55 (51) cm picture]

• Microcomputers and screening plate.
• No raster. (+ extract of circuit diagram)
• TDA2579N6 or N7 version. (extract of circuit diagram attached)
• Dark picture when cold, fault diminishes in time, but noise lines appear. (picture attached)
• LED lights green at start-up. No reaction to RC. Lower picture part becomes bright and flickers after short operation. Then picture looks correctly, but flickers. Then LED oscillates alternatively orange/green. Flickering stops after approx 10 mins and a (with circuit diagram extract)
• Chroma fault in SECAM. (part of circuit diagram displayed)
• Quick diagnosis (picture attached)
• Switches to standby (intermittently). (part of circuit diagram displayed) (SIERRA - 52KV2526 information)
• No contrast.
• No picture at start up then interference at top of screen. After this only snow, picture appears after 3 mins. (+ extract of circuit diagram)
• No RC functions.
• No RC functions. OK via SCART . (+ extract of circuit diagram)
• No picture or sound. Slight hum in the speaker. Tube lights up normally and horizontal flyback lines when G2 is pressed. No RC or front controls. (+ extract of circuit diagram)
• Safety test after repair.
• No picture for the first ten mins. White picture with flyback lines. (extract of circuit diagram attached)
• No picture. (part of circuit diagram displayed)
• Vertical bar. on the left (when cold). (+ extract of circuit diagram)
• Defective switching transistor in the sops supply.
• High contrast. in TXT.
• Does not set on channel in channel search. (part of circuit diagram displayed)
• Luminous line in the centre of the screen. (part of circuit diagram displayed)
• No picture or sound; poor raster. (extract of circuit diagram attached) (52KV2526 tip from SIERRA)
• Screen displays 00000 in green after 1 hour. (picture attached)
• Channels sometimes disappear when switching on, when switched on again everything is o.k.
• Tuning drifts. (picture attached)
• Lines appear at the top of the picture very slowly. After 15 minutes a snowy picture until finally the picture is OK.
• F3 on the screen. The standby light continually goes from red to green.
• Via aerial, picture in PAL, display ok. Sound only intermittently and only for 2-3 secs with MONO display. Ok via scart. (extract of circuit diagram attached)
• Erratic functions. (picture attached) (52KV2526 tips)
• No display. No raster. (part of circuit diagram displayed)
• No picture. Audio OK . (+ extract of circuit diagram) (52KV2526 SIERRA repair tip)
• Fixed voltage of 9V on terminal 5 of tuner. Impossible to adjust. (+ extract of circuit diagram)
• White screen. OK via SCART . (with circuit diagram extract)
• Line output transistor fails repeatedly.
• Mono/stereo display error. (part of circuit diagram displayed)
• Interference lines when cold but not when warm.
• No sound via scart input. Picture OK. No tuning via the scart of another appliance, only snow. (picture attached)
• No RGB drive of picture tube. At IC (TDA8390) inputs are ok, outputs are not present. Perhaps white line and blanking, (extract of circuit diagram attached)
• No storing when changing channels by the RC. (with circuit diagram extract)
• No red. (picture attached)
• Stripes in picture. on the left. (picture attached)
• No audio. Picture OK . (picture attached)
• Horizontal lines. when cold. (extract of circuit diagram attached)
• White screen. (extract of circuit diagram attached)
• Flashing picture. (picture attached)
• Functions ok in scart but picture only in aerial. Dead, controls do not function. (part of circuit diagram displayed)
• White line. Fuse 160mA blows. (with circuit diagram extract)
• Distorted picture. (picture attached)
• At start up no sound or picture as if blocked in AV. No command, operation or RCU, after a few minutes everything is sorted out again. (picture attached)
• When warm the raster pulls and the BU blows. (part of circuit diagram displayed)
• Switches to standby. (with circuit diagram extract)
• No picture, no display. TV crackles 2-3 times before start up. (part of circuit diagram displayed)
• When cold does not start up. Red screen. After 5 mins picture appears but it is poor.
• Dead. (part of circuit diagram displayed)
• No brightness control.
• Intermittent colour. (picture attached)
• Tube becomes orange during standby. (with circuit diagram extract)
• When warm F3 and R999 appear on the screen. At this moment picture is ok but no sound and blocked functions.
• Dark screen, 3 RGB lines at the top of the screen but no sound. (picture attached)
• No red. after warm-up.
• Snow on screen but no display, function displays F4.
• Starts, but "Mono" appears after approx 30 mins on the screen. Green LED flashes yellow and cannot be controlled. (part of circuit diagram displayed)
• SOPS defective immediately after switch on. (+ extract of circuit diagram)
• Dark screen. Green LED on the front is lit. Line output transformer grumbles slightly. Sound ok. (part of circuit diagram displayed)
• Hum in audio. in standby. (with circuit diagram extract) (52KV2526 tips)
• No colour in French standard. (+ extract of circuit diagram)
• OSD displays F4 followed by cabalistic signs.
• Picture is distorted by vertical streaks. (part of circuit diagram displayed)
• OSD discoloured.
• Black screen. intermittently.
• Picture patterning with picture tearing. (part of circuit diagram displayed)
• No sound with mono transmissions. Stereo channel 2 is ok. (with circuit diagram extract) (52KV2526 tips)
• Hum from PSU. 2 bars of 1cm horizontally on screen.
• PAL/SECAM chroma identification problem. (+ extract of circuit diagram)
• Colour fault. at start-up. (picture attached)
• At switch off large rainbow spot in middle of screen for a few mins. (extract of circuit diagram attached)
• Page 811 appears spontaneously. (picture attached)
• No control functions. Blocked. (part of circuit diagram displayed) (52KV2526 tip from SIERRA)
• TDA8153 RGB output chip IC7380 goes faulty.
• Horizontal line. on the left. (with circuit diagram extract)
• IC7720 does not function correctly. (part of circuit diagram displayed)
• No sound on Mono stations.
• With the SYSTER decoder the appliance decodes badly.
• Memory loss. (extract of circuit diagram attached)
• No start up. Buzzing sound is heard from PSU.
• Repeated destruction of the end video IC (TDA8153) (after several weeks). (picture attached)
• Error codes. (part of circuit diagram displayed)
• Flyback lines. at top. (part of circuit diagram displayed)
• Sometimes OSD is white instead of green. When OSD is white, there's no contrast or colour in TXT.
• Occasionally the PROG functions and sound block. After a power cut CTV functions correctly. (extract of circuit diagram attached)
• Incorrect mono/STEREO indication switches. (picture attached)
• Poor synchronisation. (with circuit diagram extract)
• Vertical stripes on left side. (+ extract of circuit diagram)
• Vertical lines. on the left. No colour. (with circuit diagram extract)
• No picture. Fault occurs intermittently. . (part of circuit diagram displayed)
• No picture and sound. LED lit. Picture available via Euroscart but no sound. Horizontal jamming on screen after operating for a while. (+ extract of circuit diagram)
• Functions perfectly but after a few hours when changing channe, station tuning disappears and picture is replaced by snow. After stopping TV for a few mins everything returns to normal.
• Vertical, 20cm bar on left of picture at start up. Bar disappears after 3 secs then transparent 4cm bar in left of picture. Rest of picture OK. (extract of circuit diagram attached)
• White raster with dark vertical line on the left side. (+ extract of circuit diagram)
• Microprocessor/eprom screening plate. (picture attached) (service info for SIERRA -52KV2526)
• No function. Controlling the power supply unit slowly the function is ok, otherwise BUT blows.
• Interference in picture. (+ extract of circuit diagram) (52KV2526 SIERRA repair tip)
• Protection mode activated. (part of circuit diagram displayed)
• No vertical deflection. (+ extract of circuit diagram)
• Slow start-up. Standby LED flashes . (part of circuit diagram displayed) (52KV2526 tip from SIERRA)
• No blue. (with circuit diagram extract)
• Specialist retailer RC 1375.
• Vertical white band on left-hand side. (part of circuit diagram displayed)
• Tripping. (part of circuit diagram displayed)
• F4 when warm or at start up. LED flashes orange.
• 35V instead of 100V. (+ extract of circuit diagram)
• PSU failure. (with circuit diagram extract)
• DUAL I on screen after a while. No RC. EXT3 when operated manually. Empty memory. Snow. (+ extract of circuit diagram)
• Dead. Red LED blinks.
• No picture but horizontal black and white lines approx. 3cm when cold (picture desynchronisation). When heating up picture appears with a 5cm shift to the left of the screen then everything becomes normal. Sound is normal. (with circuit diagram extract) (52KV2526 SIERRA repair tip)
• No TXT. Black screen.
• After operating for an hour changes channel by itself and sound becomes louder. (picture attached)
• Excessive horizontal size. (+ extract of circuit diagram) (52KV2526 tip from SIERRA)
• Works very well for 1hr then goes by itself into standby. (with circuit diagram extract)
• The raster fuse 100V T1500 blows every two months. (with circuit diagram extract)
• On NICAM programmes there is a popping noise.
• Whistling from PSU. (part of circuit diagram displayed)
• Bar in middle of screen. Picture ok in HF. (+ extract of circuit diagram)
• BUT11AF is defective and is destroyed at every start up. (+ extract of circuit diagram)
• Replacing the TDA8390. (extract of circuit diagram attached)
• F2 displayed on the screen and it is impossible to change channel.
• Low HV. (picture attached)
• Picture only in middle of screen.
• No synchronisation. Audio OK .
• Loss of colour. Sound goes up and down. No TXT. All functions OK with RC. (part of circuit diagram displayed)
• Cannot switch on from standby, LED flashes for a couple of secs, then switches off from standby. (part of circuit diagram displayed)
• Horizontal instability when warm. Picture out of frame. Black band on right-hand side. (with circuit diagram extract)
• Output transistor of the PSU is defective. BUT11AF, BUT18AF or 2SC3973B.
• Shuts down. LED is green.
• A production change:
• Loud plop in speakers at switch-off and hum in speakers at standby mode.
• Low contrast. in TXT.
• White band and black edge on TV tuner. Audio passes through tuner. (extract of circuit diagram attached)
• Seems to remain in PAL picture. (+ extract of circuit diagram) (52KV2526 tips)
• No tuning. only on certain channels. (SIERRA - 52KV2526 information)
• Mono/Stereo-indication switches. (with circuit diagram extract)
• Appliance can only be switched on and off, appliance does not work with remote control. Fault indication on display.
• No vertical synchronisation.
• The voltage is too low. (picture attached)
• Approx. 8cm black band on left side of screen. It lightens when warm until it disappears almost completely. Possibility of picture desynchronisation. (with circuit diagram extract)
• Correct signals at input 25, 22, 21 of the TDA 8390 (7350). Nothing at output 13, 17, 15. Low voltages, 1.6V on 11; 4.5 approx on 12, 20 and 19. TDA has already been changed. (+ extract of circuit diagram) (SIERRA - 52KV2526 information)
• No picture. after a while. OK via SCART .
• PSU noises and switches to standby. It is OK after switched on again (with circuit diagram extract)
• Power supply at 111V. (picture attached)
• Reste en veille. La LED de veille s'éteint au démarrage. Pas de balayage. (with circuit diagram extract)
• LED blinks orange, then gets green. No other function.
• At start up 30V voltage. Line BUT11 heats up too much. Square wave base signal. (extract of circuit diagram attached)
• Muted audio. intermittently. (picture attached)
• No picture. Sound ok. RC does not react. After approx. 10 mins it runs perfectly. (picture attached)
• No horizontal synchronisation. (part of circuit diagram displayed)
• RC only functions occasionally and only near to appliance. LED only flashes sometimes when transmitting. (+ extract of circuit diagram)
• Picture concentrated in the middle of the screen over a width of 3cm.
• Tube is lit during standby. (picture attached) (52KV2526 tips)
• Trips (after a few minutes). (picture attached)
• Horizontal white bar. (+ extract of circuit diagram)
• No line sync in cold condition. After approx 3 mins picture runs through vertically. After approx 5 mins picture and sound OK. (extract of circuit diagram attached)
• IC7360 heats up, switches off video signal, then goes to standby. Starts up after cooling it down.
• No start-up. (extract of circuit diagram attached)
• No signal on the BUT11AF collector. (with circuit diagram extract)
• The sound is muted and temperature dependent. (picture attached) (SIERRA - 52KV2526 information)
• Intermittently does not respond to commands. (with circuit diagram extract)
• No start up. Standby LED flashes for a couple of secs, then is switches OFF from standby.
• Picture and line do not synchronise with a normal input signal. Line and picture with a snowy picture. When injecting signal in the AV socket everything is normal. (part of circuit diagram displayed)
• Resistor R3560 (10K) burns. (with circuit diagram extract)
• Hum in standby. (+ extract of circuit diagram)
• No RC functions. after a while. (extract of circuit diagram attached)
• Over-voltage circuit active. (with circuit diagram extract)
• Power supply chirps if the mains voltage is weak. (+ extract of circuit diagram)
• No audio. No picture. (+ extract of circuit diagram)
• No TXT. No audio (when cold). (with circuit diagram extract)
• Front panel and remote commands do not react. Dark screen and sound which occasionally increases greatly. Picture appears then disappears again illogically.
• Poor synchronisation (intermittently). (picture attached)
• Colored flash when synchronization interrupts. (+ extract of circuit diagram)
• No start up when cold, green LED on. Start up ok when hot but lines appear at top of screen. (+ extract of circuit diagram)
• Control micro processors.
• Severe rippling herringbone patterning. (picture attached)
• Incorrect vertical deflection, frayed picture. (with circuit diagram extract)
• Squealing from PSU. (extract of circuit diagram attached)
• No picture and no audio when cold. Picture appears briefly from top to bottom, but only static noise. Picture content appears shortly after.
• Picture available, or intermittently only snow. Switches off after short time. (extract of circuit diagram attached)
• No start-up. LED is green.
• Black screen. Very poor sound for 10-20 mins. No function from control panel or RC. Fault starting with black lines on the sides of the tube.
• Incorrect or missing TXT colours.
• Hum in the picture and sound. Fault may be intermittent.
• Black lines in the picture. Then picture disappears. (part of circuit diagram displayed)
• Faulty TXT.
• No start-up. LED is red .
• No TXT.
• No RC functions. when cold.
• Dark picture. Picture out of place. Vertical lines on left of screen. (with circuit diagram extract)
• No or difficult switch on from standby. (part of circuit diagram displayed)
• The power supply is noisy in stand-by. (part of circuit diagram displayed)
• Poor picture. after a few minutes. (with circuit diagram extract)
• Orange flashing LED at switch on. (extract of circuit diagram attached)
• No reception, searches and stops on 131Mhz. Then it cannot be set.
• No colour. (+ extract of circuit diagram)
• Protection IC7380 picture tube panel.
• No channel lock. (with circuit diagram extract)
• No picture. TXT OK . (extract of circuit diagram attached)
• No start-up. Standby LED does not light.
• No or poor synchronisation.
• When warm various characters are displayed at the top of the screen, starting from the left and going to the right. (+ extract of circuit diagram)
• Picture shifted to the right. intermittently. (picture attached)
• At start up either white screen or LED flashes with snow then goes into standby. In either case no RC or front panel. Intermittent fault.
• Poor picture quality and snowy sound. Aerial level is too weak. (picture attached)
• Excessive brightness. Flyback lines. (+ extract of circuit diagram)
• Striped picture.
• No horizontal or vertical deflection. (+ extract of circuit diagram)
• No picture. No audio. when cold. Horizontal lines. (extract of circuit diagram attached)
• Picture appears slowly. (service info for SIERRA -52KV2526)
• Very poor picture. Dark horizontal lines over entire picture.
• White screen. Excessive brightness. Audio OK . (part of circuit diagram displayed)
• Replacing the EAROM. (extract of circuit diagram attached)
• BUT11AF is destroyed after some time. (picture attached)
• Problems with FLOF (Fastext) TXT. Cannot find page 811 whereas in spite of this page is broadcasted. TXT header remains on subtitles. (with circuit diagram extract)
• BUT power supply short circuits after 2 seconds. (part of circuit diagram displayed) (SIERRA - 52KV2526 information)
• Power supply drops out or does not start up. Standby LED is slightly green.
• Stuck in standby.
• Picture tube becomes dark and F5 appears in top left. Picture comes back intermittently, F5 stays. (+ extract of circuit diagram)
• Does not switch to standby. (extract of circuit diagram attached)
• Fuse 1600, rectification diodes and power supply BU blow at switch on. (with circuit diagram extract)
• Patterns in picture. (+ extract of circuit diagram)
• When warm there is a raster fault on the left. (with circuit diagram extract)
• On left of screen, dark, vertical, torn band. Picture goes to negative. Picture perfect on right side. (with circuit diagram extract)
• Fitting a UV818 tuner instead of a UV816 model. (with circuit diagram extract)
• At switch on snowy screen and terrible noise. After a few secs TV cuts out and does not start up again. Same after 1-2hrs. (with circuit diagram extract)
• In VCR there are only chroma lines present. (extract of circuit diagram attached)
• No picture. Audio and HV OK .
• No functions. (picture attached)
• Shuts down. (extract of circuit diagram attached)
• The R3661 resistor is open circuit. (+ extract of circuit diagram)
• Bright grey area on picture. No sound. (picture attached) (52KV2526 tips)
• Ticking noise. (part of circuit diagram displayed)
• Switches to protection mode. after a few seconds.
• No RC functions. Dark screen. Low audio.
• Picture jumps, especially without tuner reception. Display vibrates. Vertical sync problem. (part of circuit diagram displayed)
• White raster with darker bands. (+ extract of circuit diagram)
• Replacing TDA2579. (picture attached)
• Dark picture. Brightness varies.
• No vertical synchronisation (intermittently). (part of circuit diagram displayed)
• No channels. (with circuit diagram extract) (service info for SIERRA -52KV2526)
• No button operation. (picture attached)
• Reacts poorly to RC, especially when switching on from standby. (+ extract of circuit diagram)
• No power.
• Picture is white when switched on. No TXT. (part of circuit diagram displayed)
• No RC functions. after a while. Noise in picture. (+ extract of circuit diagram)
• Local dooming/PP settings. (with circuit diagram extract)
• No picture. No sound but raster and P/F sign.
• SOPS power supply. (service info for SIERRA -52KV2526)
• No start-up from standby.
• Does not switch to standby. LED is yellow. (52KV2526 tip from SIERRA)
• Standby LED blinking red and green, only noise, raster and no OSD.
• No TXT (after warm-up). (52KV2526 tips)
• Letters and figures displayed at top of screen and commands do not work. Functions well at the start. (picture attached)
• Occasionally dark screen and displays (ext). (+ extract of circuit diagram)
• Picture and sound ok via scart, nothing on the aerial input, distorted dark picture on a coloured form. (extract of circuit diagram attached)
• Purity fault.
• Noisy PSU, especially in standby. (extract of circuit diagram attached)
• Correction SERVICE INFORMATION G90B no 91.03 (4822 727 19057). (extract of circuit diagram attached)
• No switch-over upwards from 0 to 50. Switching over downwards from 50 to 0 is ok. Volume increases but does not decrease.
• LED flashes orange at switch on, no picture, no sound, fails intermittently.
• White screen, darker at left hand, lines through picture when set has been on for 10mins and the screen has cleared a bit from white blank raster. (part of circuit diagram displayed)
• No synchronisation.
• Displays erratic letters, signs and numbers. Occasionally appliance can also detune and switch channel depending on volume adjustment.
• No front panel function. (52KV2526 SIERRA repair tip)