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Old 06-13-2022, 07:47 AM   #1
[email protected]
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Default PHILIPS 42PFL4606H/58 NO backlights

Hi all, I have a philips 42pfl4606h/58 and there are no backlights. I can hook up my laptop and play video through the set. Sound but no picture. I can use a flashlight and see picture through the screen.

I will attach some photos. Are the CCFLs good? How can I test the board? Without Electrocuting myself. Any help would be greatly appreciated.
Attached Images
File Type: jpg A-side.jpg (1.04 MB, 11 views)
File Type: jpg Z-side.jpg (913.1 KB, 13 views)
File Type: jpg CCFLs.jpg (502.5 KB, 7 views)
File Type: jpg CCFLs1.jpg (314.5 KB, 9 views)
File Type: jpg CCFLs2.jpg (372.4 KB, 3 views)
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Old 06-13-2022, 08:13 AM   #2
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Default Re: PHILIPS 42PFL4606H/58 NO backlights

underside of your board is filthy, clean it up first, can use isopropyl alcohol and a toothbrush, then let it dry for at least an hour, then touch up the bad solder joints, then retry it, you're right about the DEADLY voltage, be careful, just touch the edges of the powerboard, can check the voltage of the big filter capacitor with a multimeter, they usually have 400 volts or so when powered up and can hold a big charge for a while, can discharge them with a resistor, check youtube, I use a resistor held by insulated plyers, examples of bad joints there: https://www.google.com/search?q=bad+...ih=607&dpr=1.5
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(Signature) One of the first and least expensive things you can do when you have an issue is take the powerboard out of the tv, flip it over and look the solder joints over with a magnifying glass if needed, add a little flux to make the solder flow well and add solder to any joints that look even a little suspect. You can practice on a scrap pcb board if needed, careful not to bridge any joints, and always let the board sit for quite a while or discharge the big caps with an appropriate resister before working on it (safety first) to try to keep from getting shocked, it doesn't take 1000 volts to KILL, a lot less can kill, so be careful, it's only a tv.

Last edited by nomoresonys; 06-13-2022 at 08:17 AM..
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Old 06-20-2022, 04:16 AM   #3
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Default Re: PHILIPS 42PFL4606H/58 NO backlights

There's 315 Volts across the capacitor, and I've cleaned the board and checked continuity across the board and there's no bad joints as far as I can tell. What else do you think I should check?
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Old 06-20-2022, 05:34 AM   #4
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Default Re: PHILIPS 42PFL4606H/58 NO backlights

Quote:
Originally Posted by [email protected] View Post
There's 315 Volts across the capacitor, and I've cleaned the board and checked continuity across the board and there's no bad joints as far as I can tell. What else do you think I should check?
Checking the health of the PFC node is carried out by measuring the DC voltage on the capacitor of the mains rectifier. In operating mode, it should be about 380V, in standby mode, about 300V.
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