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PANASONIC TC-21S10R 2105RT 21S1 SCH
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SERVICE MANUAL
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SERVICE MANUAL
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PANASONIC TC-21S-10R TC21S10R 2105RT 21S1 TC 21 10 2105 RT 21S10R TC-21S10R
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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
Jó éjszakát! Mondhatni, a szokásos. Sorki ég, béraktam amit a HQ adott, valami kínai csoda. Lőn kép, de raszterhibás, nosza bele egy TDA, s lett vala jó kép. Csak egy csöppet kicsi a képméret, és tán kissé buci is de az alig látszik. Állítni kék rajta, (a fejem meg zöld volt miután fél óra alatt nem bírtam rájönni, hogyan).
Üdv!
Keresek bontásból Panasonic TX-29PM1P típusú, CP-521F sassziba sorkimenőt, hát ha akad valakinél felesleges. Az utángyártottja a HR80306 vagy az FBT41280. Köszi előre is! Jani
Üdv. Mindenkinek!
A lészülék kijelzőjének felső részén először vízszintes csíkok, majd néhány nap múlva egybefüggő vastag fekete sáv jelent meg, ahogy a mellékelt képen látható.
A bekapcsolás után rövid idővel a sávban függőleges zöld csíkozás jelenik meg. A kép többi része hibátlan. A készülék két éves, a hiba a garancia lejárta után pár héttel jelent meg.Kérem a tapasztalt kollégák véleményét, milyen irányban kezdjek vizsgálódni. Amennyiben a kijelző adta meg magát, nincs sok keresnivalóm, azt hiszem.
A lészülék kijelzőjének felső részén először vízszintes csíkok, majd néhány nap múlva egybefüggő vastag fekete sáv jelent meg, ahogy a mellékelt képen látható.
A bekapcsolás után rövid idővel a sávban függőleges zöld csíkozás jelenik meg. A kép többi része hibátlan. A készülék két éves, a hiba a garancia lejárta után pár héttel jelent meg.Kérem a tapasztalt kollégák véleményét, milyen irányban kezdjek vizsgálódni. Amennyiben a kijelző adta meg magát, nincs sok keresnivalóm, azt hiszem.
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