LCD TV and Monitor basic troubleshooting guides

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

Needed scahematics diagram for all circuit boards for: TV SONY KDL-52ex700

This thread is for learning and for reference material, see the post you made for that TV you are trying to fix. Posting same request in more than one thread causes problem.

[sacrh]

Re: LCD TV and Monitor basic troubleshooting guides

Needed scahematics diagram for all circuit boards for: TV SONY KDL-52ex700

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides

http://televid-sib.ru/index.php?topic=42098.0

Power Supply Samsung BN44-00632A BN44-00633A schematic

Registration required!

[rodanny]

Re: LCD TV and Monitor basic troubleshooting guides

More Learning info.

10x
Good job....

[rodanny]

Re: LCD TV and Monitor basic troubleshooting guides

This is SONY training manual for the T-CON.

Exxcelent...10X

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

FAQ ceramic caps: Capacitance and Applied Voltage
https://cdn.badcaps-static.com/pdfs/...1cafebd52c.pdf
http://www.murata.com/en-us/support/...mlcc/char/0005

https://ec.kemet.com/ceramic-capacit...tage-ask-fae-1
https://www.maximintegrated.com/en/a...ex.mvp/id/5527

[caseyniam3]

Re: LCD TV and Monitor basic troubleshooting guides

Hi to all I am new here and have a question. I own a Sony KDL-60-EX500 one day the TV went out it has a black screen but I do have full backlighting and sound just no picture.I also notice the front panel blinks 5 times. My question is should I replace the T-con board or the Main board what are the odds of either boards fixing the problem? When I power TV on it shown Sony logo and startup sound then screen gets dark but I do have full backlighting any help is appreciated thank you all.

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides



TRAINING SAMSUNG ES EH SERIE

WAIT UNTIL GET MANUAL APPEARS

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides

http://reflektor.kz/articles.php?article_id=45

LED - Hintergrundbeleuchtung Treiber

(Ersatz von CCFL - Lampen auf LED)

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides

http://reflektor.kz/articles.php?article_id=39

http://reflektor.kz/articles.php?article_id=42

EDGE LED DIRECT LED

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

Power supply info. WE-ONLINE
http://www.we-online.com/web/en/pass...tion_45887.php

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides

SAMSUNG EH UND F SERIE no Backlight

[url]https://www.youtube.com/watch?v=KHBdZqGhMTg[/url

http://www.berlin-repariert.de/samsung-qualitaet-ue32f6270-kein-bild/

LED Driver IC slc1012c on backside smps often defect!

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

Sharp TV training manual:

[sachin03323]

Re: LCD TV and Monitor basic troubleshooting guides

Can somebody tell me what is the use of STV CKV CPV signals on TCON strip.

What voltges will i get for them with mutimeter & what waveform will i get with DSO

[skafiskafnjak]

Re: LCD TV and Monitor basic troubleshooting guides

OK i spent some time and discovered the following.

Bad cap C131 had value of 39uF and ESR of 2ohm. It should be 47uF and 70mOhm. So ESR was way higher than needed.

C102 was OK with capacitory, however, ESR was 0.173ohm. I replaced it anyway.

Since I did not have tantalum capacitor and could not keep TV open I had to fix it right away. I used 39uF 100V ChemiCon capacitors, 3 of them in parallel so I got ESR exactly 0.070ohm while capacitance was around 120uF.
These caps were replacement ones for the old projection TV, chassis RCT CTC169 (power supply).

One note I wanted to add is that Fluke 28 measured 52uF for defective cap so this means that we should not rely our decitions based on capacitance value measured by regular DMM.
Also Sencore LC103 is outdated for these new stuff, it measures as low as 0.01ohm and its test leads as well as relays inside, which become old, are not reliable way to measure such a low ESR.

Here are few pictures to share..

[skafiskafnjak]

Re: LCD TV and Monitor basic troubleshooting guides

WHat if I use 5x 10uF electrolytic in parallel?

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

They used 47uf 10V SMD Solid Tantalum cap which has low ESR and also does not dry out and deteriorate with times like typical lytics cap, it also smaller than lytics cap with the same value.
Some info:
https://cdn.badcaps-static.com/pdfs/...dea5e3c0ff.pdf
https://cdn.badcaps-static.com/pdfs/...ee7d39a774.pdf
https://cdn.badcaps-static.com/pdfs/...63aae3b97e.pdf

[skafiskafnjak]

Re: LCD TV and Monitor basic troubleshooting guides

Samsung LNXXA550P3 series with bad caps on the main board, TV makes squealing static sound through speakers, cycle on and off, etc.
Temporary solder in 100uF 10V low ESR cap in parallel with C102 to see if it solves the problem, but make sure the power supply caps are OK first.
KEMET Polymer Tantalum caps can be used.

Why regular electrolytic capacitor with low ESR wont work/last here?

[Selvaraj]

Re: LCD TV and Monitor basic troubleshooting guides

Thank you so for the info very useful

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

LED Backlights info.
http://alpengeist-tvrepair.blogspot....ces-tools.html