Help! Lost HDMI inputs after near by lightning - AVS Forum
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post #1 of 6 Old 06-30-2008, 09:12 PM - Thread Starter
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I have a Hitachi p50H401 and yesterday we had a near lightning strike and tv was on.
No Sync signal displayed on screen
I connected tv direct to comecast coax cable and put input to cable and can get reg. cable channels.
The other inputs work fine (input 1,2,3 componete)
only input not working is the HDMI's (1,2, and front)
took cable box to Comcast for exchange and got new
model 4250hdc
new hdmi cable

same problem with new cable box

Has anyone had or seen this problem
I can do electronic board replacement if that what it is but no circuit testing
cant find any info or where anyone has delt with this online or part numbers
Talked to Hitachi warranty/support and they want to try ver. flash upgrade first then send out a tech
thought I would try this forum to get some help
dont want to take it to repair shop after every storm
thanks for any tech help. Rob
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post #2 of 6 Old 06-30-2008, 09:44 PM
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i have a panny dvr (DMR series) which i use with either a pio 5080 or 6070. i have lost hdmi on more than one occasion which is not related to lightning. the problem in each case was solved by unplugging the ac power to the tv as well as the dvr. in your case since the cablebox has been replaced, i would suggest try power-cycling the tv....nothing to lose but 3 minutes. it is certainly possible and plausible that the lightning has caused some hardware damage. for future, i would also check that the cable mounting block is properly grounded at the point where it enters your house.


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Originally Posted by rjdavis21 View Post

I have a Hitachi p50H401 and yesterday we had a near lightning strike and tv was on.
No Sync signal displayed on screen
I connected tv direct to comecast coax cable and put input to cable and can get reg. cable channels.
The other inputs work fine (input 1,2,3 componete)
only input not working is the HDMI's (1,2, and front)
took cable box to Comcast for exchange and got new
model 4250hdc
new hdmi cable

same problem with new cable box

Has anyone had or seen this problem
I can do electronic board replacement if that what it is but no circuit testing
cant find any info or where anyone has delt with this online or part numbers
Talked to Hitachi warranty/support and they want to try ver. flash upgrade first then send out a tech
thought I would try this forum to get some help
dont want to take it to repair shop after every storm
thanks for any tech help. Rob

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post #3 of 6 Old 07-01-2008, 06:40 AM
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Not the same set, but my brother's Philips LCD lost all 3 HDMI inputs after a bizarre lightning strike...everything else with the TV was fine (RF, composite, S vid, component), but the HDMI input board was toast. Philips had a local contractor install a new board (under warranty). I helped troubleshoot the situation over the phone, and I thought for sure it was the HDMI output on his cable box...I couldn't image all 3 HMI inputs on the TV would get nuked, but I was wrong.

Alex doesn't live here anymore
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post #4 of 6 Old 07-01-2008, 08:36 AM
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OP_ Are you saying the lighting spike got through your surge protector?? Then through your box and then your into your HDMI cable then into your TV? WOW...
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post #5 of 6 Old 07-27-2010, 07:28 PM - Thread Starter
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Update.................................Well it happened again this summer and not under warranty this time
Whats the best way to protect your tv.
Again........
Lightning got the JA08215 Digital Video Board (main hdmi board)
and Hitachi X480414 DW3U SD PWB (front hdmi board)

now I run and unplug tv at every storm and forcast
this is nuts, thought you all would like to know
Rob,
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post #6 of 6 Old 07-27-2010, 08:39 PM
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Most times it's from an ungrounded cable line or a cable line not goign through the surge protector. What happens is a surge hits the cable line and goes through the cable box to the TV. Most cable boxes AREN'T grounded, many TV's are. Therefore the surge uses the TV as the shortest path to ground...

To prevent further problems:
1: Make sure cable line is grounded to the same point as power ground
2: Run cable line through surge protector
3: Be sure surge protector is properly ground, mostly an issue for homes built before 1970. Many have ungrounded wiring, a 3 prong plug doesn't mean it's grounded properly.
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