Question about Sharp LC-26DV24U 26 in. LCD HDTV/DVD Combo

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Problem with the Sharp LC-26DV24U 26 in. HDTV LCD TV TV/DVD Combo LC-26DV24U. Sound OK, White screen. Replaced...Ads by GooglePower Supply Repair www.PowerClinicInc.comProfessional, cost-conscious repair Most makes and models - since 1987 By macafly on Mar 05, 2011 LC-26DV24U. Sound OK, White screen. Replaced Q413. No Joy. 12.8v on E, 1.55v on C, and 1.38v on B. 1.38v and 0.09v on either side of R518. 3.33v on 13 of cp401. Know just enough to be dangerous, but always willing to try and curious how thing work. If I short emitter/collector on Q413 I get picture, but I'm sure there is a reason for the circut. What's next? macafly14 days ago nothing obvious with the caps. pg e-3 says to check pins 1-5 for 5 v on cp2804. I've searched high and low and cannot find cp2804. at cp2802 pins 1-4 show 1.55v and pin 5 0.00v. Another note, This is the later "A" unit, and I have both service manuals. The "A" manual schematic shows 12v for pins 1-4. I don't understand the circuits, but it seems Q419 controls Q413 and J20 on IC2801 controls Q419. Mark macafly13 days ago pg e-3 of the service manual says to check pins 1-5 for 5 v on cp2804. I've searched high and low and cannot find cp2804. at cp2802 pins 1-4 show 1.55v and pin 5, 0.00v. Another note, This is the later "A" unit, and I have both service manuals. The "A" manual schematic shows 12v for pins 1-4. I don't understand the circuits, but it seems Q419 controls Q413 and J20 on IC2801 controls Q419. Thanks, Mark I've posted these comments, but have not received any futher assistance. I presume either the digital PCB or power board will solve the problem, but don't know which to try or if their is a little more testing that can be done to solve the problem.

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SOURCE: By macafly on Mar 05,

I believe the Transistor Q413 is on the T-con board? The one with the LVDS connector going into the display?

Posted on Mar 20, 2011

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