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Old 08-21-2011, 09:02 PM   #1
aftonr
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Default vizio vw42l hdtv10a no picture/sound

I'm hoping someone here can help me with my problem, I have a vizio vw42l hdtv10a and I get no picture or sound out of the tv. I took off the back cover and seen the back lights are coming on but again no picture or sound. I can turn on and off the tv by using the panel buttons but thats it no menu channel up/down etc.. I have looked over several other threads involving similar problems and this is what I have replaced on the mainboard so far....


Mouser #: 621-AP1117E18G-13
Mfr. #: AP1117E18G-13
Desc.: Low Dropout (LDO) Regulators LDO BI 1.0A
used for u9

Mouser #: 511-LD1117ASTR
Mfr. #: LD1117ASTR
Desc.: Low Dropout (LDO) Regulators LOW DROP
FIXED REG
used on u8, u2, u33, u7

Mouser #: 667-EEU-FM1E221
Mfr. #: EEU-FM1E221
Desc.: Aluminum Electrolytic Capacitors - Leaded
220UF 25V ELECT FM RADIAL
used on ce75, ce8, ce7, ce14, ce16, ce91, ce2, ce1, ce5, ce6, ce23, ce11, ce27, ce18, ce25, ce26, ce20

Mouser #: 667-EEU-FR1V471
Mfr. #: EEU-FR1V471
Desc.: Aluminum Electrolytic Capacitors - Leaded
35VDC 470uF 10x16mm LS5mm
used on the two inverter boards,

I also followed the repair manual for this tv on the dc to dc converter trouble shooting guide (see attachment) after replacing all the parts listed above all voltage readings came out correctly as stated in the repair manual. and something else I noticed before doing repairs on the master inverter board there was a blue led on the pcb that would come on then go off, but after doing repairs it stays on so I guess I did something good just not good enough. thanks in advance for any help on this.
Attached Files
File Type: pdf Pages from vizio_vx42l_vw42l_hdtv10a_sm_[ET].pdf (83.8 KB, 140 views)
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Last edited by aftonr; 08-21-2011 at 09:29 PM..
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Old 08-22-2011, 10:17 AM   #2
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Default Re: vizio vw42l hdtv10a no picture/sound

I would look at the Tcon, I had the same model with a bad Tcon once.
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Old 08-31-2011, 09:03 PM   #3
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Default Re: vizio vw42l hdtv10a no picture/sound

how would you check the tcon?
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Old 09-01-2011, 03:44 AM   #4
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Default Re: vizio vw42l hdtv10a no picture/sound

Your main problem is consistant with that of an inverter board issue. There are multiple threads for this same TV set. If you search this forum for that tv model number you will find threads that tell you how to test these inverters and so on.

Here is a post of mine from a similar set with the same symptoms.

http://www.badcaps.net/forum/showthr...974#post129974
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Old 09-02-2011, 08:14 PM   #5
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Default Re: vizio vw42l hdtv10a no picture/sound

check for power at the t-con (small tiny fuse upon cable input 12vdc or so)

I would then go after the video board.

You said you have backlight?

Can you turn the tv off? (That is a big one) If not then you may need a mainboard.
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Old 09-05-2011, 11:25 AM   #6
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Default Re: vizio vw42l hdtv10a no picture/sound

Quote:
Originally Posted by Dgtech View Post
Your main problem is consistant with that of an inverter board issue. There are multiple threads for this same TV set. If you search this forum for that tv model number you will find threads that tell you how to test these inverters and so on.

Here is a post of mine from a similar set with the same symptoms.

http://www.badcaps.net/forum/showthr...974#post129974

dgtech thanks for your reply, I looked at that post during my repairs and checked the master and slave inverter they were reading 8.5k-8.4k ohms on both boards I also replaced capacitors on these boards. I also checked fuses on tcon, slave, master and main board all good and I can turn on/off tv with the control panel buttons also I have Backlight. hope this is enough information and sorry it's taking me so long to respond to your posts I'm in CT doing storm restoration work from hurricane Irene, its hard to find the time to reply. again thanks for your help

Last edited by aftonr; 09-05-2011 at 11:32 AM..
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Old 09-05-2011, 11:36 AM   #7
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Default Re: vizio vw42l hdtv10a no picture/sound

Quote:
Originally Posted by aftonr View Post
dgtech thanks for your reply, I looked at that post during my repairs and checked the master and slave inverter they were reading 8.5k-8.4k ohms on both boards I also replaced capacitors on these boards. I also checked fuses on tcon, slave, master and main board all good and I can turn on/off tv with the control panel buttons also I have Backlight. hope this is enough information and sorry it's taking me so long to respond to your posts I'm in CT doing storm restoration work from hurricane Irene, its hard to find the time to reply. again thanks for your help
I had the same problem with the same tv once and the fuse checked ok but I still ended up replacing the Tcon board. I found one on ebay for 35 bucks so instead of trouble shooting the Tcon further i just bought one there. Mine also had the problem where it wouldn't turn off as mentioned earlier. I replaced U33 regulator to fix that problem but I still had the backlight only problem that was later solved by the Tcon replacement
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Old 09-11-2011, 12:20 PM   #8
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Default Re: vizio vw42l hdtv10a no picture/sound

rmoody, I just purchased a tcon it shows it arriving 9-15-11 I will post the results when it is installed.
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Old 09-11-2011, 02:24 PM   #9
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Default Re: vizio vw42l hdtv10a no picture/sound

Quote:
Originally Posted by aftonr View Post
rmoody, I just purchased a tcon it shows it arriving 9-15-11 I will post the results when it is installed.
good deal, let us know, maybe it will fix it. It's usually the cheapest board to buy anyways.
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Old 09-15-2011, 12:37 PM   #10
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Default Re: vizio vw42l hdtv10a no picture/sound

your the man rmoody got the board in last night hooked it up and fired up like a champ. thanks for your suggestion.
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Old 09-15-2011, 04:22 PM   #11
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Default Re: vizio vw42l hdtv10a no picture/sound

Quote:
Originally Posted by aftonr View Post
your the man rmoody got the board in last night hooked it up and fired up like a champ. thanks for your suggestion.
Good deal, I checked everything i could think of on my vw42L before finally purchasing a tcon and saved the day. Mine had vertical multi color lines like a public broadcasting announcement background.
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Old 09-15-2011, 07:57 PM   #12
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Default Re: vizio vw42l hdtv10a no picture/sound

Quote:
Originally Posted by rmoody View Post
Good deal, I checked everything i could think of on my vw42L before finally purchasing a tcon and saved the day. Mine had vertical multi color lines like a public broadcasting announcement background.
well I got to do some smd soldering while fixing this tv what an experience Im just glad I got the tv back I was hesitant to try the tcon but I figured it's only 50 bucks why not. thanks again!
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Old 02-08-2012, 12:33 PM   #13
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Default Re: vizio vw42l hdtv10a no picture/sound

I have mine fixed, I replaced U2 U7 U8 U9, U33 and CE27. I screwed up removing U8 and pulled up the pad to the adj side of the regulator and I was even using the chip set stuff. Luckly it was easy enough to trace it back to the adjusting resistor so I used a small piece of wire and ran from the resistor to the regulator and saved the board. Now I have ordered a Hot air rework station for SMD work.
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Old 02-14-2012, 08:09 AM   #14
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Default Re: vizio vw42l hdtv10a no picture/sound

Want to thank everyone on this site, great information and without you guys I couldn't have fixed my TV
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Old 08-31-2013, 05:12 AM   #15
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Default Re: vizio vw42l hdtv10a no picture/sound

Quote:
Originally Posted by rmoody View Post
I would look at the Tcon, I had the same model with a bad Tcon once.
I am having the same issue as the person who started this thread. Since I am not very savvy with tech issues coulds someone explain what a Tcon is.

Thanks, Jon
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Old 08-31-2013, 06:49 PM   #16
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Default Re: vizio vw42l hdtv10a no picture/sound

Are you getting backlights?
Here are the pictures of the boards, there are more than one version of this TV.
http://www.shopjimmy.com/catalogsear...+vw42l+hdtv10a
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Basic LCD TV and Monitor troubleshooting guides.
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Voltage Regulator (LDO) testing:
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Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

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Old 09-05-2013, 05:38 PM   #17
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Default Re: vizio vw42l hdtv10a no picture/sound

I have a very similar issue with a VIZIO VW42L HDTV10A. I am fixing it for a older couple in our community and trying to save them from having to buy a new one. when I first got the TV it was not getting any power, the Visio light on the front would not com on either Orange or white. from another thread I found that the f1 fuse on the main board was bad. it had no power across the fuse and when I pressed the power button the F2 fuse did not get any power. I ordered and replaced the f1 fuse (3A) and now both of them get power when I press the power button and the f2 looses power when I turn the power off.

However, the back lights do not come on still. so from another thread I was led to test the power on the J1 connector to the Main power/inverter combo board. here are the voltage readings I get:


unit in standby
Pin#
14 0.0
13 0.0
12 4.7
11 4.7
10 4.7
9 Blank
8 0.0
7 0.0
6 0.0
5 0.0
4 0.0
3 0.0
2 0.0
1 0.0

unit turned on "white logo"
14 1.5
13 0.0
12 4.7
11 4.7
10 4.7
9 Blank
8 0.0
7 0.0
6 0.0
5 0.0
4 12.0
3 12.0
2 12.0
1 2.1
When I turn the unit on, the blue lite on the tcon board comes on bright and then fades out. Is that normal.
I have also checked the voltage at the connectors for the inverters by checking red to ground and white to ground and with the unit on none of them have any volts.
I am at a loss now where to go form here. can someone please tell me what is going on. I have good pictures and can post them.
Attached Images
File Type: jpg IMG_0432.JPG (135.4 KB, 9 views)
File Type: jpg IMG_0434.JPG (110.5 KB, 11 views)
File Type: jpg IMG_0437.JPG (133.5 KB, 13 views)
File Type: jpg IMG_0439.JPG (121.4 KB, 11 views)
File Type: jpg IMG_0441.JPG (145.4 KB, 11 views)
File Type: jpg IMG_0440.JPG (135.8 KB, 13 views)

Last edited by blmcamp; 09-05-2013 at 05:42 PM.. Reason: attach pictures
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Old 09-05-2013, 05:41 PM   #18
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Default Re: vizio vw42l hdtv10a no picture/sound

We need to know what the pins are labeled as so we can tell if it is getting the correct signals. Does it have any kind of labels, I.E. ps_on, stby, etc.? Pictures of your board?
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Old 09-05-2013, 05:46 PM   #19
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Default Re: vizio vw42l hdtv10a no picture/sound

Here are some photos of the connector. I have to sigh off for today but will check back tomorrow, thank you
Attached Images
File Type: jpg IMG_0444.JPG (103.6 KB, 10 views)
File Type: jpg IMG_0443.JPG (109.3 KB, 10 views)
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Old 09-06-2013, 10:04 AM   #20
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Default Re: vizio vw42l hdtv10a no picture/sound

OK. I am back now. I had to go home and put our some fires
I hope the pictures I attached help.
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