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PANASONIC TX28PK25 EU4H
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(PDF)
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11.6 MB
11.6 MB
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38
38
Category
TV
SERVICE MANUAL
TV
SERVICE MANUAL
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PANASONIC TX-28PK-25 TX28PK25 EU4H TX 28 PK 25 EU
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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
Sziasztok!
Fenti TV-t ügyfél kikapcsolta, azóta csak berreg, nem indul. STR51424-es a tápja, sorvégtáp 122V, táp szekunder oldalán 2 fesz kellene, hogy legyen, az egyik a sormeghajtó darlington tranyó részére, ez megvan, de a másik, amiből egy 5V-ot is előállít egy stabkocka, 12V-nak kellen lenni és csak 6V. Nem terhel neki semmi, legalább is úgy tűnik. Hibát nem találok. Ha lenne valami ötletetek, megköszönném!
Üdv: Laci
Szep napos idot minden tanyalakonak!
A fentemlitett tv szerviz menube szeretnek belepni.A sasze a hatlapon levo info szerint Z7-es,de a tanyan levo koddal nem lep be a szerviz menube.A taviranyito kod EUR 511300-LP.
Minden segitseg jol jon
Koszonom szepen!
Nagyvarad,Jozsef46.
Sziasztok!
Nevezett készülék tápegység javítás után már bekapcsol, de más "életjelet" nem produkál. Készenléti led villogása jelzi, hogy veszi a távirányító jelét, mégsem történik semmi. Kezelőszervnél ugyanez. (kikapcsolni sem lehet) Tápfeszültségek rendben, vagyis amiket sikerült azonosítanom. Lenne tippje valakinek mi lehetne a következő lépés a hiba behatárolásában?
Köszönettel: Kiss Z.
Nevezett készülék tápegység javítás után már bekapcsol, de más "életjelet" nem produkál. Készenléti led villogása jelzi, hogy veszi a távirányító jelét, mégsem történik semmi. Kezelőszervnél ugyanez. (kikapcsolni sem lehet) Tápfeszültségek rendben, vagyis amiket sikerült azonosítanom. Lenne tippje valakinek mi lehetne a következő lépés a hiba behatárolásában?
Köszönettel: Kiss Z.
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