LG 47LK550 Support Question

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Question posted by Gregcox65 on October 15th, 2015

Lg 47lk550 Picture

my LG 47LK550 tv has sound but no picture

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Answer #1: Posted by techyagent on October 16th, 2015 10:10 AM

techyagent

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The part that cause the common failure of LG 47lk550 No picture just sound are the Y-sus & Z-sus circuit boards.The part in the Y & Z sus boards are call IPM.The reason is heat generated by impedance and age.I found a method to prevent this problem is by making the IPM work cooler by adding more heat sink area on to the existing heat sink.Without additional heat sink the IPM temperture measures 75 degrees C.What I learn about semiconductors failure,heat is one of them.Also mosfets inside the IPM will short and burn up.The LG P/N. for the IPM is 4921QP1043B.

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Related LG 47LK550 Manual Pages

Specification - Page 1

..., you are Wi-Fi™ Ready. 47LK550 47" Class 1080p LCD TV (46.9" measured diagonally) FEATURES • LG Smart TV1 • TruMotion 120Hz • Wi-Fi® Ready (Adapter Included) • Magic Motion Remote Compatible (Sold Separately) • Full HD 1080p Resolution • DLNA Certified® • Picture Wizard II • Intelligent Sensor •...

Specification - Page 2

... Mode/ISFccc Ready xvYCC AV Mode (Picture & Sound) Picture Wizard II (Easy Self Calibration) Enhanced Noise Reduction AUDIO Mono/Stereo/Dual (MTS/SAP) Audio Output (Watts - THD 10%) Speaker System Dolby Digital Decoder Surround System Bass/Treble/Balance Auto Volume Leveler Sound Mode Clear Voice II CONNECTIVITY LG Smart TV LG App Store Web Browser Wi-Fi...

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