Toshiba 37" inverter board failure

[97wing]

My nephew's tv (37CV510U) quit so I said I would look at it. The green power light will come on, but no picture. I checked the power supply output voltages and they are all fine.

I did a visual inspection of the other boards and found on the inverter board (PPW-EE37VT-0 Rev 2) the two caps(680 uf) were bulged.

Further inspection shows a damaged controller chip (BD9897FS-E2). The burnt spot is on pin 26 which the data sheet says in volts input.

That trace goes over to R15 which is labeled "103". I read the value of the resistor (soldered on) to be 8.7 ohm. I found another resistor on the board with "103" on top and it read .455 ohm (also soldered in). Do they have to be removed to read correctly?

I researched the controller chip (BD9897FS-E2) and found that normal suppliers do not have anything in stock and minimum order was 2500 or so. Is there a cross reference for this chip?

Thanks,

Steve

[Dgtech]

Re: Toshiba 37" inverter board failure

Sweet! I have seen this about four times with four different sets now (Toshiba, Philips, Vizio and one other). Check my post (#29) on the site below. You will find that the resistance checks you are getting is reading back through the chip. Whenever the chip is removed, it will read higher. It still wont read 103 = 10K ohms but closer to it, it has another parallel path. Yo can buy this chip on ebay for about $5 each from china.

https://www.badcaps.net/forum/showth...974#post129974

[Dgtech]

Re: Toshiba 37" inverter board failure

Dont forget, there is a fuse on this board as well. Usually you can find it near the connector.

[Toasty]

Re: Toshiba 37" inverter board failure

Kit including IC, driver transistors, and fuse:

http://cgi.ebay.com/6632L-0506A-PPW-...-/160497809334


Whole board is around $90-$120 depending on supplier.

Is there another number on the board -> 6632L-0506a ? Try looking for that also.

Resistors are probably fine unless they appear burnt or have a bubble on them. Both are 10k resistors. Bad resistors go up in value, not down. You are reading them in circuit, so something else is tied to them.

Toast

[97wing]

Re: Toshiba 37" inverter board failure

I did see that ebay kit during my part number search. I was concerned that the root of the failure is still undetermined. Both caps were bulged ... perhaps that lead to the chip failure?

[Dgtech]

Re: Toshiba 37" inverter board failure

I had one where the caps were good and just that chip was bad. I'm certain that once you change the caps and the IC chip, you'll be OK.

[97wing]

Re: Toshiba 37" inverter board failure

Hope so... I have ordered the parts.

[matt2oo5]

Re: Toshiba 37" inverter board failure

anyone still on this I have the same issue

[gilly1984]

Re: Toshiba 37" inverter board failure

anyone still on this I have the same issue

Considering it was 2010 the last post i am gonna guess that we have had no update.

Not sure though if you should start a new thread or carry on this one. One of the more senior members will let you know shortly.

[smata67]

Re: Toshiba 37" inverter board failure

Just opened up my VO42L and BD9897FS-E2 has burnt up exactly as shown in Post 1. Caps look and check out ok with my esr meter. So does the fuse. I will order a replacement kit from ebay.

[whatusername]

Re: Toshiba 37" inverter board failure

I am going to pick up one of these TVs today in about 2 hours for $15 unless 1 of u guys tell me not to and if I pick it up I will revive this thread so that we can actually have an ending

[Dgtech]

Re: Toshiba 37" inverter board failure

Go for it. Do you have the chip if you need to replace it.

[whatusername]

Re: Toshiba 37" inverter board failure

chip? what chip?

[whatusername]

Re: Toshiba 37" inverter board failure

ok so i just powered the tv on and it powers up and has backlight and sound just no picture
i want to guess inverter board except i cant find it in the tv lol i see power board main board and tcon board wth is the inverter board and does anyone have a service manual for this tv?

[budm]

Re: Toshiba 37" inverter board failure

If you have backlights, then it is not inverter board problem. Check and see if you do have 12VDC on both ends of the fuse on the T-CON board.

[whatusername]

Re: Toshiba 37" inverter board failure

these are the 3 boards i find im thinking top one is what i thought was tcon board? i dont see a fuse

[budm]

Re: Toshiba 37" inverter board failure

Black fuse (with 'TK' printed on the top) F1 to the left of the LVDS connector, the label on the board is 1.5A 63V

[whatusername]

Re: Toshiba 37" inverter board failure

ok i finally found it and its open

[budm]

Re: Toshiba 37" inverter board failure

Do you have any 2A fuse?

[whatusername]

Re: Toshiba 37" inverter board failure

no sir unless theres one on that old power supply from that samsung u just helped me fix or mayb one on the y sus z sus or main board from this vizio P50hdm i just junked