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Philips 42PFL5603D/12 - White screen    
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sn0wer



Joined: 15 Oct 2017
Posts: 4

PostPosted: Sun Oct 15, 2017 4:42 pm    Post subject: Philips 42PFL5603D/12 - White screen Reply with quote

Hello everyone,

I had some trouble lately with an LCD screen https://imgur.com/gallery/fV2is. Image became white all the sudden.

I have several questions :

A/ I've read that it's probably the TCON board's fault, is it plausible ?

B/ In the affirmative, can I fix it myself ? Where should I start to look ?

For those who are interested, here is the service manual (https://elektrotanya.com/philips_42pfl5603d.pdf/download.html).

Thank you.
Google

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JTS1957



Joined: 21 Jan 2009
Posts: 2347
Location: Far, Far Away

PostPosted: Sun Oct 15, 2017 7:07 pm    Post subject: Reply with quote

Audio or NO Audio?
Are ALL OSD's washed out or normal, you only show one example, which seems washed out?
sn0wer



Joined: 15 Oct 2017
Posts: 4

PostPosted: Wed Oct 18, 2017 2:12 pm    Post subject: Reply with quote

Hello JTS1957. Thank you for your response.

JTS1957 wrote:
Audio or NO Audio?
Are ALL OSD's washed out or normal, you only show one example, which seems washed out?


Audio is normal. But ALL OSD are washed out.(https://imgur.com/gallery/4sZpv)

EDIT : when I unplugged my computer and tried to plug it again, the screen wasn't the right size anymore (you can see it the second image on the url above)
JTS1957



Joined: 21 Jan 2009
Posts: 2347
Location: Far, Far Away

PostPosted: Wed Oct 18, 2017 4:29 pm    Post subject: Reply with quote

So your complaint is more consistent with 'washed out' rather than 'white.'

Since OSD & video are affected equally ...
A Tcon board is cheaper and is more easily obtained than a panel which is the second choice.
sn0wer



Joined: 15 Oct 2017
Posts: 4

PostPosted: Sat Oct 28, 2017 7:40 am    Post subject: Reply with quote

Just a quick followup for anyone having the same problem.

I found an interesting video (https://www.youtube.com/watch?v=eZZwb35ou_Y) to detect problems with gamma channels (generated here with AS15F chip). There are testing points (called VGMA1, VGMA2, ...) on the TCON (called T420HW01 V2) that you can measure (see the video) to see if the gamme channels are generated correctly. Lucky for me the voltage points weren't coherent (should increase/decrease linearly) + the IC was too hot. I'm going to change it with a rework station and see what happens.
Google

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