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Help Needed - Thomson 27LCDB03B not working
Acrantophis:
Yep, that will be the pin 1 indicator, different manufacturers will exercise different methods. What pad has lifted, if it breaks off when re-attaching the new device you will need to patch the circuit, which could be a ball ache. Not sure what to advise regarding the video issue though as I am a novice when it comes to TV repairs.
micheldeman:
Hi,
I have managed to replace the U6301. I have checked all the pins and their connections to the first adjacent components and they seem to be fine. Soldering is an easier task then desoldering.
Meanwhile, I also replaced the 2 diodes D6303 and D6304 (I am now only left with 98 of these) and transistor Q6302.
Now I am trying to get hold of Q6301 a STW11NB80. RS components didn't have it in stock in their company shop although their website says they would. I am trying to get it through the person of ebay from which I bought the transistor and diodes.
Then next are the resistors.
Slowly but steady going...
Currently I have the power board of the other TV in my faulty TV. I have found that if I keep the TV on, also after it his been shut down, the green led still burns and I can see the back light is also still on, then after a few minutes or so, after I have switched on the satellite receiver, the TV continues playing (after a restart).
It is thus when the TV is cold, it shuts down, only after a while, when it is warm?, it keeps functioning. I found another thread that describes the same issue. http://www.fixya.com/support/t3580460-thomson_27lcdb03b_now_seems_need but no solution given unfortunately.
Acrantophis:
So you've had some success with the replacing of the IC in that you didn't break any of the tracks. When I was researching the faulty PSU I had I discovered that whilst the manufacturer is kinown as Thomson within Europe, they also trade as RCA in America. So you might find the answers you seek by widening the search to include RCA LCD TV's.
From the symptoms you are describing I can't help but feel that the problem lies with a capacitor (Electrolytic type) this could even be one on the main board or inverter as opposed to the PSU card. You would need to visually inspect these to see if they are either bulging or burst, any that look suspect would be worth changing. I'll see if I can find anything further for you and will post it here, hopefully you'll be able to get it working soon.
micheldeman:
I have replaced the STW12NK90Z (as alternative for the STW11NB80 or STW12NK80Z).
I tested/measured the resistor of 68K ohm, 2 watts. It seems to be fine. The 0.27 ohm 2 watts one is dead. I am trying to find it but it seems to be a difficult job. If anyone knows how/where to get it?
then I only need to find the smd resistors.
thanks,
Michel
Acrantophis:
This is a 0.27ohms (0.27R) 3Watt device as opposed to the 2 Watt spec'd, provided it is the dimensional size it shouldn't be a problem, if anything it will be better as it can dispate more heat.
http://shop.conrad-uk.com/components/passive-components/resistors/smd-resistors/smd-resistors-rest-of/428874.html
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