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Help Needed - Thomson 27LCDB03B not working
Acrantophis:
Mike, if you can get the parts through RS then you could collect from their trade counter in Birmingham, assuming it is not to far for you to travel. :dubbio:
Duddeston Mill Road,
Duddeston Mill Industrial Estate,
Birmingham,
B8 1AP
Alternatively the U6301 device can be sourced through Ebay http://www.ebay.co.uk/itm/UC3843BD1G-UC3843B-PWM-Controller-Current-Mode-52kHz-SOIC8-/300617498920?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item45fe330128
I looked at the Maplins website when I was searchign for them but couldn't find them, however they may be able to help you for the other parts and the surface mount resistors.
I'll keep checking the post daily so if you need any help just ask.
micheldeman:
hi Acrantophis,
ebay, never thought about that, how genius.
I am going today to maples for the capacitors and will see what the result of that for the second board is.
Then subsequently going for the other parts, ordered already two (one spare) of these U6301 devices through the ebay link.
will keep you updated.
thanks,
Michel
micheldeman:
Today I went to Maplin (not maples, I always confuse the two names) to buy the capacitors, but they had not much of them in stock, so I went to RS components in Nuneaton. I have bought all of the capacitors, except the C6311 of 150uF which was not in their catalogue. According to the service manual, the value should be 100uF, so I got the 100uF ones instead. Same like the value of C6314.
What do you think, is it wise to just use the 100uF or still go for the 150uF one? There must be a reason that they have used 150uF in production, rather than the 100uF as designed?
I also tried to get some of the other components from my list in order to repair the first board. So far, I only got the transistor Q6302 MPSA44G, they didn't have the Q6301 STW12NK80Z, so I left that for later. The U6301 should come trough ebay. Then I still need to get hold of the smd diodes, which was a bit difficult for me to order as I don't know about sizes etc. They also come in large(r) package sizes or on roll. Resistors I should be able to get through Maplin as I was thinking to use conventional ones.
thanks,
Michael.
micheldeman:
I have replaced the capacitors, for the 150uF I have put 100uF and 47uF in parallel.
It looks like the TV is a bit more stable, at least a picture comes up, but still after a few seconds it switches off again. Led remains green and I can turn off the TV by remote as well.
I expect the U6301 to arrive shortly, so I will just try to replace it and see what happens then.
I haven't swapped and tried the PSU from the other good working TV yet, just to exclude that the failure may come from another part inside the TV. Will be another step when replacing the U6301 gives no good result either.
to be continued...
Acrantophis:
Mike, what is the baord number? The board I repaired had capacitor values as per the schematics/circuit diagram. As manufacturers can change components from time to time I'm wondering if you have a different board rev level.
For the diodes marked 4148, like D6303 (located between the emmiter of Q6302 and pin 7 of U6301) try LL4148. Effectively a standard 1N4148 diode but in a surface mount package. Again ebay is your friend for these :- http://www.ebay.co.uk/itm/LL4148-SMD-minimelf-Diode-Pack-100pcs-/290605876056?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item43a975c358
I would only use Maplins (Maples) out of desperation and wanting to be further dissapointed as they are 1 step short of being useless and also over priced for parts.
Good luck
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