Response to your advice flm323b no pwr. firstname.lastname@example.org
No, it will not. You must understand what type of readings you are supposed to get from them before you can determain if the reading is correct. A transformer will measure nearly zero ohms when measured across the primary or when measured across the secondary. You must know what the leads of the transformer are. Troubleshooting a power supply can be difficult at times. If I had the schematic for this unit I could probably point you in the right direction pretty quickly, but I do not have one. Most times the power cord will go directly to the transformers primary, maybe thru a switch and a fuse. In your case I think that it just goes thru a fuse and then to the transformer. In this case, it is likely that the transformer primary is shorted. If you know where the secondary is at for the transformer, you can disconnect it and then put a fuse in and see if it still blows the fuse. If it does, and the power cord is connected directly to the transformer without any other circuit branched off of it, then it could only be the transformer. If the power cord feeds another circuit, like for a standy-by circuit which supplies a voltage for the micro so the TV can turn on, the problem could be in that stand-by circuit. The stand-by circuit is normally a smaller transformer with a couple of diodes used as rectifiers and a smaller capacitor or 2 that also lead you to a voltage regulator or transistor that is used as a voltage regulator.
The most important thing you need to do is isolate the main transformer if it goes directly to the power cord. By disconnecting the secondary leads of the transformer you take it out of the circuit so that nothing on that side of it can be causing a short. If the secondary of the transformer is soldered directly into the circuit board, then you need to take that solder off of the secondary so that it is no longer in the circuit. You will need to do that with some solder wick which is used for removing solder. The leads for it must not be touching any of the circuit traces on the board. It is the only way to be certain that the secondary is not causing the short, or at least nothing in the circuit past the secondary is causing the problem.
This really should be an easy problem to find, you have a direct short somewhere, or at least a component directly in the path of the power cord that is near shorted and causing massive current draw. This is where the schematic is needed since I can not be there with you to actually look at it with my own eyes.
I hope this helps you find this problem, if not, we can continue this conversation. But I did notice that you have not rated, accepted, or not accepted any of the experts solutions. I believe in order for you to see more solutions you must rate the solution you have so far. If you accept a solution from an expert it will be that experts responsibility to help you solve your problem. Please be aware that some problems just can not be solved in an online forum, sometimes it it requires the technician to actually get their eyes on it. I would also like you to know that even if you accept this solution from me in this thread, I will not get the credit for it unless you accept the solution I provided for you in the paid question you posted earlier today. I can always post another comment on the paid questions thread if you would like to accept it there so I can get the credit for it. Any post you make on the paid thread you should use the experts name you want to communicate with so all the experts know who you are talking to, unless you are just wanting to let all the experts know .
One more thing you should know, since they do not explain it very good to the customers of FixYa!, the ratings in this thread are different from the ratings on the paid thread. Anything less than a FixYa! rating on this thread will lower my overall rating, but any ratings on the paid thread have no effect on the experts ratings. So a "Thanks for Trying" rating on the paid thread is not a negative rating, just means you want more help from other experts. But a "Thanks for Trying" on this thread is a really bad rating that no expert here wants to get. In the paid thread, the experts are just working to make money, here it is free and effects our overall ratings.
I hope this was not confusing for you, I can try to explain any of this post you do not understand, just let me know what you need explained.
Nov 14, 2008 |
Polaroid FLM-323B Television