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.
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maximo
June 22, 2013 at 12:39 pm
DEBE SER MUY INTERESANTE
Fuseini Mumuni
June 22, 2013 at 3:36 pm
The light bulb in place of the open fuse should have glowed to indicate a shorted component but it didn't. Why did the bulb deceived you. Was there any way you could have found the shorted sot-23 transistor and some bad surrounding components? Could you have prevented the loss of complete Master Invertor board? Could you have reduced e-waste in this way?
Grant
June 30, 2013 at 12:48 pm
The good news is the old Master Board has lots of components I will recycle in the future.
$23.00 is not much here in the USA so it was cheap to buy these used replacement boards and this kept the TV set(E-WASTE) out of the Land Fill.
Erik Blankers
December 17, 2013 at 1:04 am
Not very smart this repair.
Because:
What kind of bulb do you use: 220v or 12v for example.
And what kind of power are these bulbs then?
TIP:
by shorted electronics: your power supply board, take of the powercable and shorted the low power voltage outputs.
Then take a Ohm meter and measure the Ohm whit one tip to the contact of the fuseholder , and the other tip of the measurecable to the ground of the board.
then the same whit the other contact of the fuse holder.
When the meter gives zero Ohms you have a short circuit on the board.
Its very simple.
greatings
eb
Waleed Rishmawi
June 22, 2013 at 5:03 pm
hey grant. very good article. thanks for sharing
ibrahim
June 25, 2013 at 8:49 pm
mr waleed,i do like your commentsam ibrahim plz mail me @ sagaciousllyjoyous@yahoo.com am a prospective electronics repairer.thanks
Pepper
June 22, 2013 at 6:38 pm
I wouldnt call this a repair as such since you didnt really reapir anything. This is more like throwing things away which is not cheap for the customer or good for the enviroment. If you cant repair on a component level then you will have fewer happy customers. No-one wants to pay for your "service" of swapping boards and the boards themselves - too expensive and encourages customers to throw away the whole tv instead.
Bradley
June 22, 2013 at 10:09 pm
Good Article
Juan Carlos
June 23, 2013 at 11:50 am
Thanks!Mr.Yong for this solution, Please give us more lcd and led repair!
Tyrone.
June 23, 2013 at 8:23 pm
Very good article.
Andre Gopee
June 24, 2013 at 8:28 pm
I agree with Pepper, I would off like to read more component and trouble shooting repairs not board changing repairs.
LITEC
December 5, 2013 at 1:13 am
thanks a loooooottttt for this article mr/ yong &GRANT on this good &usefull article can very help the idea's for recognize the problems....
sorry on the spelling&bad english/// i'm from israel....
marco tapia
October 20, 2014 at 1:05 am
I agree with erik blankers and pepper about the board swapping instead of fixing on the component level but it still was a good article as one can always learn from others mistake, thanks for this article.