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PANASONIC TX 25LD4F 28LD4F CHASSIS EURO4
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1.4 MB
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34
Category
TV
SERVICE MANUAL
TV
SERVICE MANUAL
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PANASONIC TX CHASSIS EURO-4 25LD4F 28LD4F EURO4 25 LD 28 EURO
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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
Üdv. mindenkinek!
A fent nevezett készülék nem hangol le egyetlen csatornát sem. Kapott egy új tunert, de így sem. Tuner feszültségek rendben vannak, SDA-SCL is elér a tunerig. Egyik pillanatról a másikra lett ilyen baja. Sajnos a tuner csere sem oldotta meg a problémát, valószínűleg alap probléma (CPU) hibát gyanítok. 1.269 szoftver fut rajta.Találkozott e valaki már ilyennel? Esetleg bontott, jó alaplapot keresek. LA35 a belseje, main: TXN/A10TLUE.
Köszi!
A fent nevezett készülék nem hangol le egyetlen csatornát sem. Kapott egy új tunert, de így sem. Tuner feszültségek rendben vannak, SDA-SCL is elér a tunerig. Egyik pillanatról a másikra lett ilyen baja. Sajnos a tuner csere sem oldotta meg a problémát, valószínűleg alap probléma (CPU) hibát gyanítok. 1.269 szoftver fut rajta.Találkozott e valaki már ilyennel? Esetleg bontott, jó alaplapot keresek. LA35 a belseje, main: TXN/A10TLUE.
Köszi!
Sziasztok fórumozók !
A fent említett készülék került hozzám. Tehát a hibajelenség az, hogy a kijelző bal felében, de majdnem középen egy kb 5 cm szélességű fekete csík van mellette zöld és piros vonal látszik.
A tápfeszültségeket megmértem és azok jónak mutatkoznak. Mielőtt nagyn belemélyednék, gondoltam felteszem a fórumra hátha valaki kapásból tud segíteni.
Előre is köszönöm a hozzászólásokat.
Csaba
Sziasztok!
A címben szereplő hibán kívül minden ok, viszont a tulajnak fontos a HDMI is. Szoftverfrissítést érdemes próbálni, vagy alaplap csere?
A címben szereplő hibán kívül minden ok, viszont a tulajnak fontos a HDMI is. Szoftverfrissítést érdemes próbálni, vagy alaplap csere?
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