Service manuals, schematics, eproms for electrical technicians
PANASONIC TX-21AD3F
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TV
EPROM
TV
EPROM
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PANASONIC TX-21AD-3F TX21AD3F TX 21 AD 21AD3F TX-21AD3F
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Sziasztok!
Van itt egy ilyen tv, ami tunerről gyakori időközönként leáll készenlétbe, és villog a készenléti LED, mintha letiltana valamiért. Még nem mélyedtem bele nemsokára belenézek a műhelyben. Forrasztási hibákat kizártnak tartom mert nem olyan régen már javítottam egyéb hibával (képcső csere, + elkók cseréje) ekkor át lett forrasztva ami gyanús volt. Az adatvonalon keresztül kavarna be a tuner, vagy megsérül a kép vagy sorszinkronjel és ezért tiltana le? Mit javasoltok mivel kéne kezdenem?
Kösz előre is!
Sziasztok!
Tunerról jól működik szines,viszont AV-n RCA-ról és Scartról nincs szín,hogy tudnám behatárolni ezt a hibát.A segítséget megköszönném!
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
Helló!
Ez a korábban javított készülék mibe a VDP 3108 volt a hibás. Ki is cseréltem és jó is lett , de nem tudom hangolni. Írtam bele egy epromot, de azzal sem jó. A setup gombot megnyomva feljön a menű, de a le-fel gombokkal rögtön az állomásokat váltja és kilép a menűből. Hotelmódba lenne, vagy a 2 ic közötti különbség (A-A1) okozza?
Köszi, üdv.: Ízirájder
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