Troubleshooting - Panasonic TH-80LF50ER Operating Instructions Manual

Troubleshooting

Before you call for service, determine the symptoms and make a few simple checks as shown below.
Symptoms
Picture
,QWHUIHUHQFH
1RUPDO 3LFWXUH
1R 3LFWXUH
1R 3LFWXUH
1R &RORXU
1R UHPRWH FRQWURO RSHUDWLRQV FDQ EH SHUIRUPHG
$ FUDFNLQJ VRXQG LV VRPHWLPHV KHDUG IURP WKH XQLW
7KH WRS RU ERWWRP RI WKH SLFWXUH RQ WKH VFUHHQ LV FXW
RII ZKHQ , XVH WKH ]RRP IXQFWLRQ
$UHDV DW WKH WRS DQG ERWWRP RI WKH VFUHHQ ZKHUH
WKH LPDJH LV PLVVLQJ DSSHDU ZKHQ , XVH WKH ]RRP
IXQFWLRQ
, FDQ KHDU VRXQGV FRPLQJ IURP LQVLGH WKH XQLW
3DUWV RI WKH XQLW EHFRPH KRW
3RZHU DXWRPDWLFDOO\ WXUQV RII XQH[SHFWHGO\
There is no picture displayed or sound output
VRPHWLPHV
7KLV /&' 'LVSOD\ XVHV VSHFLDO LPDJH SURFHVVLQJ +HQFH D VOLJKW WLPH ODJ PD\ RFFXU EHWZHHQ LPDJH DQG DXGLR GHSHQGLQJ RQ WKH W\SH
RI LQSXW VLJQDO +RZHYHU WKLV LV QRW D PDOIXQFWLRQ
LCD Display panel
Symptoms
The screen darkens slightly
ZKHQ EULJKW SLFWXUHV ZLWK PLQLPDO
PRYHPHQWV DUH VKRZQ
,W WDNHV D ZKLOH IRU WKH SLFWXUH
WR DSSHDU
7KH HGJHV RI WKH LPDJHV ÀLFNHU
7KHUH PD\ EH UHG VSRWV EOXH
VSRWV JUHHQ VSRWV DQG EODFN
VSRWV RQ WKH VFUHHQ
,PDJH UHWHQWLRQ DSSHDUV
Sound
Electrical Appliances
1RLV\ 6RXQG &DUV  0RWRUF\FOHV
)OXRUHVFHQW OLJKW
9ROXPH
1R 6RXQG &KHFN ZKHWKHU WKH PXWH IXQFWLRQ KDV EHHQ DFWLYDWHG RQ WKH UHPRWH FRQWURO
1RW SOXJJHG LQWR $& RXWOHW
1RW VZLWFKHG RQ
1R 6RXQG
3LFWXUH DQG %ULJKWQHVV9ROXPH VHWWLQJ
&KHFN E\ SUHVVLQJ WKH SRZHU VZLWFK RU VWDQGE\ EXWWRQ RQ WKH UHPRWH FRQWURO
,I D VLJQDO ZLWK D QRQDSSOLFDEOH FRORXU V\VWHP IRUPDW RU IUHTXHQF\ LV LQSXW RQO\
1RUPDO 6RXQG WKH LQSXW WHUPLQDO LQGLFDWLRQ LV GLVSOD\HG
&RORXU FRQWUROV VHW DW PLQLPXP OHYHO
1RUPDO 6RXQG VHH SDJH  
&RORXU V\VWHP VHH SDJH 
&KHFN ZKHWKHU WKH EDWWHULHV KDYH GLVFKDUJHG FRPSOHWHO\ DQG LI WKH\ KDYH QRW
ZKHWKHU WKH\ ZHUH LQVHUWHG SURSHUO\
&KHFN ZKHWKHU WKH UHPRWH FRQWURO VHQVRU LV H[SRVHG WR DQ RXWGRRU OLJKW RU D
VWURQJ ÀXRUHVFHQW OLJKW
&KHFN ZKHWKHU WKH UHPRWH FRQWURO GHVLJQHG VSHFL¿FDOO\ IRU XVH ZLWK WKH XQLW LV
EHLQJ XVHG 7KH XQLW FDQQRW EH RSHUDWHG E\ DQ\ RWKHU UHPRWH FRQWURO
,I WKHUH LV QRWKLQJ ZURQJ ZLWK WKH SLFWXUH RU VRXQG WKLV LV WKH VRXQG RI WKH FDELQHW
XQGHUJRLQJ YHU\ VOLJKW FRQWUDFWLRQV LQ UHVSRQVH WR FKDQJHV LQ WKH URRP WHPSHUDWXUH
7KHUH DUH QR DGYHUVH HIIHFWV RQ WKH SHUIRUPDQFH RU RWKHU DVSHFWV
$GMXVW WKH SRVLWLRQ RI WKH SLFWXUH RQ WKH VFUHHQ
:KHQ XVLQJ D YLGHR VRIWZDUH SURJUDP VXFK DV D FLQHPD VL]H SURJUDP ZLWK D
VFUHHQ ZLGHU WKDQ RQH LQ WKH  PRGH EODQN DUHDV VHSDUDWH IURP WKH LPDJHV
DUH IRUPHG DW WKH WRS DQG ERWWRP RI WKH VFUHHQ
:KHQ WKH SRZHU LV WXUQHG RQ D VRXQG RI WKH GLVSOD\ SDQHO EHLQJ GULYHQ PD\ EH
KHDUG 7KLV LV QRUPDO DQG QRW LQGLFDWLYH RI PDOIXQFWLRQLQJ
Even when the temperature of parts of the front, top and rear panels has risen, these
WHPSHUDWXUH ULVHV ZLOO QRW SRVH DQ\ SUREOHPV LQ WHUPV RI SHUIRUPDQFH RU TXDOLW\
&KHFN WKH VHWWLQJV RI ³1R VLJQDO SRZHU RII´ ³3& 3RZHU PDQDJHPHQW´ ³'9,'
3RZHU PDQDJHPHQW´ DQG ³1R DFWLYLW\ SRZHU RII´ $Q\ RI WKHP PD\ EH VHW WR ³2Q
(QDEOH ´ VHH SDJH  
:KHQ +'0, RU '9, VLJQDOV DUH LQSXW WR WKH 'LVSOD\ XVLQJ D VHOHFWRU RU GLVWULEXWRU VRXQG RU
LPDJHV PD\ QRW EH RXWSXW LQ WKH QRUPDO IDVKLRQ GHSHQGLQJ RQ WKH VHOHFWRU RU GLVWULEXWRU XVHG
7KH V\PSWRPV PD\ EH LPSURYHG E\ WXUQLQJ WKH SRZHU RII DQG RQ DJDLQ RU E\
UHSODFLQJ WKH VHOHFWRU RU GLVWULEXWRU
The screen will darken slightly when photos, still images of a computer or other pictures with minimal
PRYHPHQWV DUH VKRZQ IRU DQ H[WHQGHG SHULRG 7KLV LV GRQH WR UHGXFH LPDJH UHWHQWLRQ RQ WKH VFUHHQ
DQG WKH VKRUWHQLQJ RI WKH VFUHHQ¶V VHUYLFH OLIH ,W LV QRUPDO DQG QRW LQGLFDWLYH RI PDOIXQFWLRQLQJ
7KH XQLW GLJLWDOO\ SURFHVVHV WKH YDULRXV VLJQDOV LQ RUGHU WR UHSURGXFH HVWKHWLFDOO\ SOHDVLQJ LPDJHV $V
VXFK LW VRPHWLPHV WDNHV D IHZ PRPHQWV IRU WKH SLFWXUH WR DSSHDU ZKHQ WKH SRZHU KDV EHHQ WXUQHG
RQ ZKHQ WKH LQSXW KDV EHHQ VZLWFKHG
'XH WR WKH FKDUDFWHULVWLFV RI WKH V\VWHP XVHG WR GULYH WKH SDQHO WKH HGJHV PD\ DSSHDU WR ÀLFNHU LQ
WKH IDVWPRYLQJ SDUWV RI WKH LPDJHV 7KLV LV QRUPDO DQG QRW LQGLFDWLYH RI PDOIXQFWLRQLQJ
7KLV LV D FKDUDFWHULVWLF RI OLTXLG FU\VWDO SDQHOV DQG LV QRW D SUREOHP 7KH OLTXLG FU\VWDO SDQHO LV EXLOW
ZLWK YHU\ KLJK SUHFLVLRQ WHFKQRORJ\ JLYLQJ \RX ¿QH SLFWXUH GHWDLOV 2FFDVLRQDOO\ D IHZ QRQDFWLYH
SL[HOV PD\ DSSHDU RQ WKH VFUHHQ DV ¿[HG SRLQWV RI UHG EOXH JUHHQ RU EODFN 3OHDVH QRWH WKLV GRHV
QRW DIIHFW WKH SHUIRUPDQFH RI \RXU /&'
,PDJH UHWHQWLRQ PD\ RFFXU ,I \RX GLVSOD\ D VWLOO SLFWXUH IRU DQ H[WHQGHG SHULRG WKH LPDJH PLJKW UHPDLQ
RQ WKH VFUHHQ +RZHYHU LW ZLOO GLVDSSHDU DIWHU D ZKLOH 7KLV LV QRW FRQVLGHUHG DV PDOIXQFWLRQ
Checks
Check
53