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- What is the original issue in TV?
- Does the power light blink 5 times?
OK, there are several circuit boards involve for 5 times blink error code and a procedure to troubleshoot the bad board, reasons of problem are appended below..
1. Missing P5V
2. A short of the P5V3. A short of the Vda line (Note: missing Vda from the P board does not cause 5 blinks)4. Wrong diagnostic by the A board
Lets troubleshoot the problem properly.
Does the power supply makes a “chirp” noise at plug in TV power cord?
Reply back with the result to proceed further.
OK, do you have multimeter to check resistance?
If so, disconnect the TV power cord. Measure the resistance between pin 1 of connector P35 on the P board and ground (Chassis).
Is there a short to ground (low ohms reading)?
OK, so reading is 7800 ohms, correct?
If so, use a volt-meter and place the positive probe on pin 5 of connector P25 on the P board while the negative probe is grounded. Plug in the TV and turn it On.
Does meter show 5V reading?
It is switched 5V supply that will turn Off when SOS kicks in. Standby 5V supply is available at pin-9 of P25 connector and would remain stable all the time as far as power cord is plugged in.
If you press power button on TV again, hopefully 5V will again appear, if this happens that means A Board of TV is defective and causing the problem, A board is where all video inputs are located and you would need to replace A board in TV to resolve the problem. I trust my input will help you out. Please feel free to respond if you have any additional questions.A positive rating to answer would be greatly appreciated, please click on 5 star on this page then click submit/finish button so I can get credit on website for my work. If you don't see rating option then intimate here.Regards,Shahid.
OK, you can again check the volts at pin-5, unplug TV power cord for 5 minutes, replug back in, touch meter lead to pin-5 and press power button, volts should remain till SOS kicks in.
I wish there was such a way but we can't bypass the protection circuitry on A board.
Hi, do you need any further assistance with this question?Thanks.
We figure it out during troubleshooting process that A board is suspected and should be swapped.
Sorry to hear that, give me little time to check the manual again and get back to you in 30 minutes.
First of all please make sure all connectors are plugged securely and tight on circuit boards, especially on SC, SU, SD and A boards. If still get 6 blinks error code then verify that all the cables plugged in to the SC and SS boards are properly seated. Also check the ribbon cables and connectors on the A and C boards. Unplug the TV power cord and disconnect connector SC20 on the SC board and the ribbon cable between connector C10 on the C1 board and connector C20 of the C2 board. Plug in the TV and turn it on.
Does the number of blinks change now?
OK, do you still have old A Board and can put it back in TV to get previous symptoms?New A board seems doubtful and old A board installation will help here, if you get previous symptoms then new A board seems defective and should be contacted to supplier to return this one to get another A board.
No special test with old A Board, since new A board gives 6 blinks error code that is bit odd so we can confirm the other boards in TV by installation of old A board to see if TV gives 5 blinks error code?
I'm running out of ideas what is causing the problem, let me repost this question so other experts can have a look and hopefully some one will soon respond to assist you further.
I'm opting out to repost the question.