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PANASONIC TX28SL20C PANTX28N

TV - EPROM
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Category
TV
EPROM
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    PANASONIC PANTX-28N TX28SL20C PANTX28N TX 28 SL 20 PANTX
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Relevant TV forum topics:
Panasonic TX-29PM1P sorkimenőt keresek
Üdv! A napokban már többször előfordultam itt, bontott trafót kerestem... Most már megelégednék újjal is, csak ne kelljen KIT-ben megvenni... Ha valaki tud beszerzési forrást 13022001B vagy HR80306, esetleg FBT41280 trafóra, kérem segítsen! Szempont a jobb ár... Köszi! Jani
Panasonic TX-L42ETW5 Device does not start anymore, stand-by LED lights up red, no SOS error code
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
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Szevasztok! Tapasztaltabb kollégák segítségét kérem. Adott a fenti Panasonic. Főkapcsolóval való bekapcsolás után háromféle variáció lehet. 1. Bekapcsol és működik, kép, hang, geometria rendben, távval kapcsolható....hibátlan. 2. A Stby-LED nagyon gyorsan villog, a készülék nem indul. 3. A Stby-LED sötét marad és szintén nem indul. Leggyakrabban a kettes-hármas pont valósul meg. Ilyenkor tasztra, távra nem reagál, de a Stby tápok 1,8V; 3,3V rendben megvannak a kvarc rezeg. A tápok szűrtek, látszólag a reset feszültség is rendben, de ilyenkor az IC601 proci pin27 power ON-OFF lábán bekapcsoláskor nem jön meg a magas szint. Volt-e valakinek ilyen géppel hasonló gondja? Gondolok esetleg egy időnkénti eeprom olvasáshibára.? Netán valami protekt blokkolja? Kíváncsi vagyok a véleményetekre, hátha a megoldást valaki tudja. Jó volna hamar túl lenni rajta! üdv
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