Toshiba 42HP66 no video have sound

[Shinju]

Hi!

I have a toshiba 42HP66, has sound but no video. I have not had a chance to take the back off and get pictures and voltage readings.

Where should I start? I don't hear any Y or X buzzing and I see they both have 4 ceramic fuses.

Thanks!

[ajshoe]

Re: Toshiba 42HP66 no video have sound

MY FIRST QUESS WOuld be IPM is bad on y sys. very typical. its a fairly easy repair - buy a new IPM and remove old (google it) and install new. good luck.

[Shinju]

Re: Toshiba 42HP66 no video have sound

I tried doing a quick google search but it kept pulling up CoopellTV repair lol.

Does anyone happen to know the part number off hand for the IPM?

[capkid]

Re: Toshiba 42HP66 no video have sound

The IPM part number is usually listed on the side of the large heat sinks. The 42HP66 I'm working on uses YPPD-J018C: http://www.ebay.com/itm/YPPD-J017C-Y...-/110502432151

Check the white ceramic fuses on each of the sustains. A blown fuse is a typical indicator of IPM failure on that particular board. If you've never replaced an IPM, it is NOT an easy repair for a first-timer. Take your time:

https://www.youtube.com/watch?v=Y8MNQYXw8E0

[capkid]

Re: Toshiba 42HP66 no video have sound

I sent you a PM, also. If you have an ESR meter, can you tell me the capacitance and ESR measurements you receive for the cap at C22 on the Y-Sus's PS101 board?

[Truncatedhose]

Re: Toshiba 42HP66 no video have sound

I have the same TV here I'm working on with the same symptom. I suspect the Y-SUS, however none of the fuses are bad, which makes me a little doubtful. The IPM heatsink never gets warm, while conversely the Z-SUS heatsink DOES indeed get warm. I would suspect a bad IPM on the Y-SUS, but the lack of a blown fuse makes me wonder. Can anyone offer any help?

I pulled the Y Drive/buffer out and measured it for shorts, but it seems to be fine. My next step is to pull the Y-SUS and check the IPM for shorts using this guide:

http://blog.coppelltvrepair.com/2011...s-ipm-for.html

I will see what I find.

When the IPM blows, do the fuses sometimes remain intact?

[Truncatedhose]

Re: Toshiba 42HP66 no video have sound

Okay, so the Y-SUS IPM measures okay in the 6 tests Coppell TV lists. I can't seem to be able to find a problem on the Y-SUS. I pulled the Z-SUS and it's IPM also checks okay.

If anyone has run into one of these sets with no bad fuses, but symptoms of a bad Y-SUS, please reply! Thanks!