Philips 42PFL5432D 42″ LCD Repair
Philips digital widescreen flat TV 42PFL5432D 42″ LCD Full HD 1080p with Digital Crystal Clear.
This TV came to me with the SYMPTOMS of no video after 10 min or so. I powered on the TV and all seem to be good. I could see the OSD of (No Signal). Picture was fine. I decided to wait a little while and see if it would loose video. I thought i wold check out the menu. As soon as I pressed the Menu button the video was gone (Black Raster).
I powered off the TV and back on , hit the Menu button and sure enough the video would go away. Now that I see the problem it is time to take it apart. I first check all the voltages on the power supply, and all voltages are spot on. I then looked at the T-Con board.
Time for some voltage testing. I noticed 2 voltage regulators on the tcon board. I powered the tv on and took a voltage measurement and it was 2.7v . I hit the menu and then checked it and it was o volt.
I directly replaced the voltage regulator. Same problem. I got out the Heat Gun and thought I would see if I applied heat to different parts of the board maybe it would make it fail and I would look at that part of the board to trouble shoot.
I heated on the CMD chip first and noticed that as long as I had heat on it I could hit the menu button and it worked. And when I took away the heat video lost. I could have re-flowed the chip to try and fix the bad BGA connection, but I found a USED t-Con board for $25.00.
Now this is not all the problems with this TV. While I was looking for a T-Con ( Timing Control Board ) the tv was right beside me and running just fine. A flash of light caught my eye. I noticed there was no more back light. I went to the Master Invertor board and checked some Fuses. I found one open.
I put my light bulb in place of the open fuse and power on the TV. No bulb burning so No shorts.I replaced the fuse directly and powered on the TV. I see a puff of smoke from a sot-23 transistor. I checked the surrounding components and found other small SMD components shorted as well. This means it is not worth to repair and found a used Master Invertor board for only $23.00 .
I installed the new boards and the set is back up and running fine. I plugged in a cable to the tuner and did a channel scan and let the set play for some hours and was satisfied with the result.
This article was prepared for you by Grant Fullen, one of our ‘Master Authors’ for Best Electronics Articles website. He specializes in laptops and desktop computer repair. He also provides the services of virus removal, formatting and hardware issues. You may access his website at http://www.GrantsPCRepair.com. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.