Mulja tv repair portal
Spares => Spares to buy => Topic started by: dougc on November 05, 2010,16:25:36
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i need a runtka396wjn1 board or any info on it.
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Hi Dougc,
Guess it small screen - don't have it listed - well, at least without set model - Chris.
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i
have inverter board which i keep for spares
had several transformers fail on cust sets
managed to get repaired by replacing them
dave
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Hi Chris, it is a lc32d44.
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Hi Dave, it may well be a transformer although i've compared resistances & give or take a little they seem to read alike. The set reverts to st/by after couple of seconds but i can get it to start by holding input & vol- while switching on. Then i get sound but no pic. I would like to try a transformer but i am unsure of procedure on this site, Doug
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hi try this
Re: Sharp LC32D44 lcd tv
« Reply #22 on: September 16, 2010,05:28:18 » Quote
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Quote from: Contrast John on May 08, 2010,08:01:21
Hi All
Managed to sort this one out. The lamp error counter had reached 5 which means the set needed to be started in service mode (hold down input and vol - on tv set whilst applying mains until the letter K appears on the screen, after which press vol - and prog - on tv set to get the service menu). Had no joy doing this though because the ccfl driver IC (BD9883 smd) was going into protection mode and preventing the backlight from operating. To get round this problem I overode the protection by fitting a shorting link across C7558 (smd capacitor) located near the IC. The set would now start in service mode.
Found that there are some test patterns available in the service mode one of which is a grey screen. Selecting this option showed the problem. The area across the centre of the screen was darker than the rest indicating the centre pair of ccfl tubes weren`t working. This chassis uses 10 tubes driven by 5 inverter transformers mounted in line with them, so before embarking on a tedious stripdown I ruled out the possibility of a duff transformer by swopping the centre one with one of the others. No change of course, so I dismantled the unit and checked the tubes and their holders for any visible problems. None were apparent but replacing the tubes cured the problem. Just needed to clear the lamp error and remove the link
Hope this info might be useful and thanks to the above contributors for the input.
Regards
John.
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You have made an old tv engineer very happy!! Thanks to you all for your input. Everything John said worked fine & the set is now up & running, Doug