Question about Panasonic TH-42PA20U/P 42 in. Plasma EDTV
Looks like some kind of protection fault, the source of which can be determined if you can tell me how many times the power light blinks in between each pause.
Posted on Oct 16, 2010
This TV (TH-42PA20U) has internal fan, that is reported in service manual. The 11 blinks is indeed P or PA board fan.
As probably explained the TV is in protect mode. Protect mode starts when a fault is detected. The second click that you hear is the protection switch turning off the PSU higher voltages to prevent further damage. Only the low standby +5v or +3.3V is allowed. As a result the TV will be forced to stand by.
As probably already mentioned, the 11 blinks means a problem with fan or fan control. Fan is tested energizing it and reading volts at connector.Fan control is located on PA board (DC/DC secondary PSU). This is a DC 15V circuit. A diode (D574) and the +15V transformer must be tested, along with the fan. +15 V coming from power board must be OK and steady.
The fan itself is rarely the problem, most of the time you have to test at component level to find the fault.
Here a suppletive service manual including circuit diagrams.
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Posted on Oct 16, 2010
As you have tried unplugging the TV for few minutes without any success, this would confirm that this is an internal fault and repair is needed for the same. If the set is under warranty, get it replaced or repaired at no cost. However, if it is out of warranty, either you could call a tech on site to get it repaired or you could go for DIY ( do it yourself ).You need to open the TV, might need to use multimeter or soldering iron. I would also send you the link where you could purchase the service manual as you need schematics to know the exact value of each and every component.If you want to fix it yourself, kindly provide few more details :-
1. When you press power button, do you get 2 blink pause 2 blink error?
2. Do you have anything hooked with TV with HDMI cables?
If you have HDMI cables attached, you need to remove and then unplug the TV for few minutes, say 15 minutes and then turn it on. If the problem persists, we need to move further and try to fix this problem.
Let me know,so that we could proceed.
Hope i helped you.
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Posted on Oct 09, 2010
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Posted on Jan 02, 2017
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