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PANASONIC TX-21F1T
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327.0byte
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TV
EPROM
TV
EPROM
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PANASONIC TX-21F-1T TX21F1T TX 21 21F1T TX-21F1T
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Manufacturer: Panasonic
Type: TX-L42ETW5
Chassi: LA35
Hello everybody,
I could determine or measure the following with the device:
Device does not start anymore, stand-by LED lights red when device is plugged in and flashes red as soon as an IR command (key press) is sent via the remote control. Voltages of power supply STB 5V and signal LCD_TV_SUB_ON come from A-board. Power supply starts, supplies P15V and SUB1.1V, 1.5V, 1.8V, 3.3V, 5V, HDMI3.3V and USB5V are generated on the A-Board (stand for about 2.5 seconds). Then signal LCD_TV_SUB_ON goes low (voltages go away to STB 5V) and after about 2 seconds back to high (endless). What is missing is the voltage PNL12V which is switched on by PANEL_VCC_ON2. PANEL_VCC_ON2 always has a low signal and does not change its state. Power supply also provides for the 2.5 seconds the 24V for the backlight. Clocking of LCD_TV_SUB_ON starts immediately after plugging in the mains plug (also without IR command). SOS error code is not output. The over-voltage circuit in IC 5000 pin 7 also does not respond. Attached is the timing diagram from the technical training of Panasonic where I have drawn until when the boot process behaves normally.
In my opinion a mistake on the A-board? Does anyone have a tip?
greetings
Andi
Type: TX-L42ETW5
Chassi: LA35
Hello everybody,
I could determine or measure the following with the device:
Device does not start anymore, stand-by LED lights red when device is plugged in and flashes red as soon as an IR command (key press) is sent via the remote control. Voltages of power supply STB 5V and signal LCD_TV_SUB_ON come from A-board. Power supply starts, supplies P15V and SUB1.1V, 1.5V, 1.8V, 3.3V, 5V, HDMI3.3V and USB5V are generated on the A-Board (stand for about 2.5 seconds). Then signal LCD_TV_SUB_ON goes low (voltages go away to STB 5V) and after about 2 seconds back to high (endless). What is missing is the voltage PNL12V which is switched on by PANEL_VCC_ON2. PANEL_VCC_ON2 always has a low signal and does not change its state. Power supply also provides for the 2.5 seconds the 24V for the backlight. Clocking of LCD_TV_SUB_ON starts immediately after plugging in the mains plug (also without IR command). SOS error code is not output. The over-voltage circuit in IC 5000 pin 7 also does not respond. Attached is the timing diagram from the technical training of Panasonic where I have drawn until when the boot process behaves normally.
In my opinion a mistake on the A-board? Does anyone have a tip?
greetings
Andi
Szép napot Mesterek! szeretnék segítséget kérni a fenti készülékkel kapcsolatban. Bekapcsolás után a kijelző 0-át mutat,nem reagál a masina semmire. Erős zizegés hallatszik valahonnan(a nagyfesz.környékéröl) chass:tnp17828 köszike
Kedves kollégák! Sziasztok!
Egyszerű hibának tűnt de elakadtam.
Bekapcsoláskor kép-hang tökéletes, néhány perc után,ez változó) a hang elmegy és csak erős sistergés hallatszik.
Norma marad, váltásra nem változik. Hűtésre fűtésre nem reagál.
Újra indításnál van hang bizonytalan ideig. MSP3415 helyett MSP3410-et tettem ezzel is ua.
Kvarcot cseréltem. Esetleg egy memó tartalmat belepróbálnék, bár nem hiszem, hogy az a hiba.
Tápfeszek megvannak. Persze sok maniókát nem dobnának rá.
Hátha találkozott már valaki ilyen problémával.
Köszi,üdv,kovi
Udvozlom a tanyazo kolegakat ,es egyuttal meg is kernem hogy segitsenek ha tudnak . Egy Panasonic CP521F sassi nal visszatero vonalak latszanak a kep felso reszebe,piross es zold is van kozte.A tda8358j-t es a szuro kondikat kicsereltem , a 13v es 45v ,c370,r370 rc tag ok. Lehetne a vezerlesbol?
Elore is koszonom a segitseget.
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