Alright I will try to make this quick. First I would like to say that I am new and have read tons of very informative information on the forums here. A ton of great minds here so I am hoping we can all troubleshoot and fix the issues I am having.
Model: KDL-46v3000 Sony Bravia LCD
Issues: Black vertical bars mid screen full screen height
Background: A friend picked this tv up from a local woman he did some work for. He was instructed to take it to the dump. He instead brought it to me in hopes that I could fix it.
Upon getting the unit I powered it up to see that it was giving me a red blinking led code. 6 blinks which I researched to find was a back light issue. I looked around online and found the service and training manual for this set. After following some voltage checks I was able to determine the issue was with the G1 (power supply) board. I pulled the G1 and to my dismay the board had a rather large crack along the top of the board where the two 450v capacitors fed the H2 and H3 boards (ballancer boards in this unit, normally called an inverters I suppose). Anyhow I cleaned the board up glued it exposed the broken traces, soldered some bridges, and ultimately made some rather extensive jumpers. I then put the power supply back in and was happy to see that I had a working picture. Well kind of. I guess the original issue the set was having was that it was displaying double images and darkness so the owners resulted to hitting the unit in order to "fix" the issue. The issue was still present after fixing the ps G1 board although after heating up for a few minutes the issue seemed to resolve itself. I followed some information found online and decided to troubleshoot the tcon board. It seemed to me that if I powered the unit on cold the issue would occur, however if i pulled one of the two ribbon cables connecting to the lcd boards that the issue would disappear.
It was during one of these disconnects that some vertical white lines, probably 2-4 pixels wides appeared around 5 pixels to the right of a few of the tabs on the left side of the screen. They were all uniform as in respect to the distance from each tab. I shut the unit down to do some more research and the next time I powered the set up I had a new issue. A HUGE black panel several pixels wide was now running vertically under one of the tabs. That tab is HOT HOT HOT to touch and i believe caused the tcon board to blow the 3a fuse. At this time I have replaced the fuse and found no other issues with the tcon and am hoping to find some direction as to what could be wrong with the culprit tab and if it is able to be repaired.
How to troubleshoot an ic in a tab? what would make it hot as hell? could there be a short in the bond?
thanks in advance! this is an awesome place!
Model: KDL-46v3000 Sony Bravia LCD
Issues: Black vertical bars mid screen full screen height
Background: A friend picked this tv up from a local woman he did some work for. He was instructed to take it to the dump. He instead brought it to me in hopes that I could fix it.
Upon getting the unit I powered it up to see that it was giving me a red blinking led code. 6 blinks which I researched to find was a back light issue. I looked around online and found the service and training manual for this set. After following some voltage checks I was able to determine the issue was with the G1 (power supply) board. I pulled the G1 and to my dismay the board had a rather large crack along the top of the board where the two 450v capacitors fed the H2 and H3 boards (ballancer boards in this unit, normally called an inverters I suppose). Anyhow I cleaned the board up glued it exposed the broken traces, soldered some bridges, and ultimately made some rather extensive jumpers. I then put the power supply back in and was happy to see that I had a working picture. Well kind of. I guess the original issue the set was having was that it was displaying double images and darkness so the owners resulted to hitting the unit in order to "fix" the issue. The issue was still present after fixing the ps G1 board although after heating up for a few minutes the issue seemed to resolve itself. I followed some information found online and decided to troubleshoot the tcon board. It seemed to me that if I powered the unit on cold the issue would occur, however if i pulled one of the two ribbon cables connecting to the lcd boards that the issue would disappear.
It was during one of these disconnects that some vertical white lines, probably 2-4 pixels wides appeared around 5 pixels to the right of a few of the tabs on the left side of the screen. They were all uniform as in respect to the distance from each tab. I shut the unit down to do some more research and the next time I powered the set up I had a new issue. A HUGE black panel several pixels wide was now running vertically under one of the tabs. That tab is HOT HOT HOT to touch and i believe caused the tcon board to blow the 3a fuse. At this time I have replaced the fuse and found no other issues with the tcon and am hoping to find some direction as to what could be wrong with the culprit tab and if it is able to be repaired.
How to troubleshoot an ic in a tab? what would make it hot as hell? could there be a short in the bond?
thanks in advance! this is an awesome place!
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