Question about Televison & Video
Hi 1/I have a transonic 49" about 2years old and it occasionaly flashes blue but then turn tv off and then on and then most of time ok. 2/ the picture though shows the bottom third in grey ,sometimes a smaller line of grey just appears in middle. Any ideas would be most appreciated
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Posted on Jan 02, 2017
SOURCE: Flickering blue picture
I finally got around to dismantling the TV. This is no mean task. The chassis is tethered to the rest of the set my over a dozen wiring harnesses and a few of these cannot be disconnected near the chassis but instead require removing the “right support” near the air duct and taking the shield off the lamp ballast. Once the chassis assembly is out, it is a further significant task to disassemble it to get at the various PWBs (POWER, FMT and DM) having the suspect caps. I’m sure reassembling everything will be a fun job!
I have not yet had a chance to fix and reassemble but I wanted to post this no as I’m not sure when I will get around to it.
I did find six of the fourteen known-problem caps to be visibly bulging -- both 3300s and two of the four 1000s on the PWR PWB plus two of the four 1000s on the FMT PWB (see photos below). Ironically of the four 1000s on the DM PWB, which I have heard are the most common to go bad, were bulging and I considered skipping these as the DM it is the toughest board to extricate from the chassis, however I figured I had come this far and I would just as soon replace all twelve 1000 uFs as the parts cost $0.23 and I really never want to have to do this again.
If I had to bet, the two 10V 3300uF caps on POWER board, which were actually leaking black goo, are the actual culprits, but with four of the 1000 uFs also bulging it is probable only a matter of time until they failed as well.
Here is the POWER PWB with the known-problem caps (C9A37, C9A38, C9A51, C9A52, C9A61 and C9A62) highlighted:
here's the FMT PWB with the known-problem caps (C8F19, C8F21, C8F22 and C8F27) highlighted:
and the DM PWB with the known-problem caps (C81A2, C81A3, C81B3 and C81B4) highlighted:
Here are close-ups of the bulging caps (C9A37, C9A38, C9A52 and C9A62) on the POWER PWB:
And here are close-ups of the bulging caps (C8F19 and C8F27) on the FMT PWB:
Posted on Feb 16, 2008
those are going to be dust spots on the LCD panels internal to the optical engine. i suggest that you take the screen off and take off the panel i nthe middle of the tv with 2 screws in it and there will be an area that has 3 metal fins covering thin orange ribbon cables. the 3 square objects at the end of those ribbon cables will be the LCD panels spray wiht air compressor unitl clean and that should greatly help your problem.
Posted on Feb 20, 2008
SOURCE: RCA- R52WH74
I had the problem with my rca looking like it was in 3d. anyways, I read this post and ordered the part ($3.79). did the soldering and TV works perfect now. Txs so much for the info on how to fix the problem. I was so worried it was going to cost a ton to have someone repair the TV. Much appreciated!
Posted on Apr 20, 2008
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