Get an exclusive sneak peek into our new project. >>> Click Here

LG 52" DLP turning off after about 15 minutes.

736 Views 5 Replies 3 Participants Last post by tubetwister, Mar 31, 2015

JPgirl

Discussion Starter · Mar 17, 2015

So we have a 52" LG DLP. ( 52SZ8D-UA)
We bought it second hand last October and it only needed a new lamp. $100 and we were up and rockin with a new TV for our kids play room!

It has been working flawlessly for the last 5 months.
In the last couple weeks whenever we turn it on, it will turn itself off after about 10-20 minutes.
The picture looks fine, there are no warning lights on, no clicking or cracking sounds, everything is as it should be.
If you wait about 2 minutes after it turns itself off, it will automatically turn itself back on.
Many times it will be perfectly fine and the kids can watch it for a few hours with no further issue, sometimes it will turn itself off one more time and go through the same cycle.
Each time when it turns on, the power indicator light flashes yellow 10-12 times and then goes green and the tv comes on as normal.
You hear the colour wheel or fans spin up and hear no other odd sounds.

As far as I know, this is the sets second lamp. And it is nearing 9 yrs old, but was not used for a few years after the first lamp went out.
We replaced the original lamp with a Phillips, and it is still under warranty for another month, so if it is possibly the lamp I'd like to figure that out now rather than later

Any ideas?

Save

1 - 6 of 6 Posts

tubetwister

· #2 · Mar 17, 2015 (Edited)

JPgirl said:
So we have a 52" LG DLP. ( 52SZ8D-UA)
We bought it second hand last October and it only needed a new lamp. $100 and we were up and rockin with a new TV for our kids play room!

It has been working flawlessly for the last 5 months.
In the last couple weeks whenever we turn it on, it will turn itself off after about 10-20 minutes.
The picture looks fine, there are no warning lights on, no clicking or cracking sounds, everything is as it should be.
If you wait about 2 minutes after it turns itself off, it will automatically turn itself back on.
Many times it will be perfectly fine and the kids can watch it for a few hours with no further issue, sometimes it will turn itself off one more time and go through the same cycle.
Each time when it turns on, the power indicator light flashes yellow 10-12 times and then goes green and the tv comes on as normal.
You hear the colour wheel or fans spin up and hear no other odd sounds.

As far as I know, this is the sets second lamp. And it is nearing 9 yrs old, but was not used for a few years after the first lamp went out.
We replaced the original lamp with a Phillips, and it is still under warranty for another month, so if it is possibly the lamp I'd like to figure that out now rather than later

Any ideas?

Never worked on a DLP but failing electrolytic capacitors in the power supply or something with the lamp,lamp circuit or another circuit comes to mind .

Lots of stuff about this on Google and You Tube : https://www.google.com/search?q=dlp....15455j0j7&sourceid=chrome&es_sm=122&ie=UTF-8

See less See more

Save

JPgirl

Discussion Starter · #3 · Mar 19, 2015 (Edited)

Yeah the DLP is foreign to me too!
I have fixed a few LCD's and they have been pretty straightforward... no moving parts... just pull a board and put a new one in!
I can handle that

I have searched and searched and the other threads I have found about TV's just shutting off didn't really fit our scenario.
Ours turns itself back on after about 2 minutes and when it does shut down there is no red light on the power indicator, like there usually is when you press the power button to turn it off yourself.
It is like it goes completely dead or does a hard reset or something and then all the sudden comes back to life.... every single time.
I know what a blown capacitor looks like... frankly I haven't had the chance to open it up yet.... not sure I want to! lol
Like I said... moving parts lol.
You would think if a cap was blown, it would just shut off and not come back on, if it was a temperature problem, the temperature warning light would come on, if it was a lamp problem the lamp warning light would come on... but none of those things are happening so I am assuming that none of those things are the problem... Just sort of looking for a direction to go in.
It is not like it is a heavily used set.... it is only on its' second lamp and has pretty low hours on that, though I haven't checked how many exactly.

See less See more

Save

JPgirl

Discussion Starter · #4 · Mar 22, 2015

So, I got some time tonight to take a look.... I didn't tear it right down.
I went conservative and removed and inspected the lamp (in the cage), removed all the access panels, vacuumed and de-dusted where I could.
Everything looked ok, no bulging caps that I could see, no burnt parts, just a little dust here and there but nothing significant.
Put it all back together and fired it up to see what it would do....

We watched it for 15 minutes and like clockwork it shutdown...... just a click and no red lights, no nothing...so we waited the couple minutes for it to fire back up 2 minutes..... 3 minutes.... 5 minutes...... 10 minutes..... I said to my daughter it has never taken this long before.
I tried unplugging it and plugging it back in... nothing.... its dead.

Save

garciab

· #5 · Mar 23, 2015

Well, if there's a bright side, it's that at least now you have a permanent defect. It will be easier to track down than an intermittent one, if you choose to do so. Good luck!

Save

tubetwister

· #6 · Mar 31, 2015 (Edited)

JPgirl said:
So, I got some time tonight to take a look.... I didn't tear it right down.
I went conservative and removed and inspected the lamp (in the cage), removed all the access panels, vacuumed and de-dusted where I could.
Everything looked ok, no bulging caps that I could see, no burnt parts, just a little dust here and there but nothing significant.
Put it all back together and fired it up to see what it would do....

We watched it for 15 minutes and like clockwork it shutdown...... just a click and no red lights, no nothing...so we waited the couple minutes for it to fire back up 2 minutes..... 3 minutes.... 5 minutes...... 10 minutes..... I said to my daughter it has never taken this long before.
I tried unplugging it and plugging it back in... nothing.... its dead.

Immediate shut down and delayed shut down can both be capacitor failures they usually progress to where the set won't turn on at all .
capacitors can fail and look fine also OTOH PSU rail volt outputs are easy to verify with a $15.00 DVM they are printed right on the board .

note : without measuring the PSU rail volts in the set and checking the connections and grounds anything above is a guess .

Here is a post I made about power supply failures and remedy's http://www.avsforum.com/forum/166-l...616-vizio-e601i-a3-repair-3.html#post33050113

Save

1 - 6 of 6 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

LG 52" DLP turning off after about 15 minutes.

JPgirl

tubetwister

Attachments

JPgirl

JPgirl

garciab

tubetwister

Top Contributors this Month