Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Blown IC

Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??
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Default Blown IC

On 01/04/2021 19:04, Stu jaxon wrote:
Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??


You missed an 'I'

Googling is remarkably effective with the right input.

e550I-b2 ic901

e.g.

https://www.badcaps.net/forum/showthread.php?t=79046

https://www.badcaps.net/forum/showthread.php?t=70423

Apparently a LD7913JGM6, a PWM controller?

--
Adrian C
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Default Blown IC

On Thursday, April 1, 2021 at 2:33:50 PM UTC-4, Adrian Caspersz wrote:
On 01/04/2021 19:04, Stu jaxon wrote:
Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??

You missed an 'I'

Googling is remarkably effective with the right input.

e550I-b2 ic901

e.g.

https://www.badcaps.net/forum/showthread.php?t=79046

https://www.badcaps.net/forum/showthread.php?t=70423

Apparently a LD7913JGM6, a PWM controller?

--
Adrian C



I have a .068 ohm resistor reading 0.00.. acting like a short, it is a low ohm resistor, is it supposed to read???
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Default Blown IC

On Tuesday, April 6, 2021 at 8:35:31 AM UTC-4, Stu jaxon wrote:
On Thursday, April 1, 2021 at 2:33:50 PM UTC-4, Adrian Caspersz wrote:
On 01/04/2021 19:04, Stu jaxon wrote:
Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??

You missed an 'I'

Googling is remarkably effective with the right input.

e550I-b2 ic901

e.g.

https://www.badcaps.net/forum/showthread.php?t=79046

https://www.badcaps.net/forum/showthread.php?t=70423

Apparently a LD7913JGM6, a PWM controller?

--
Adrian C

I have a .068 ohm resistor reading 0.00.. acting like a short, it is a low ohm resistor, is it supposed to read???

board part # R804A...
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Default Blown IC

On Tuesday, April 6, 2021 at 8:35:31 AM UTC-4, Stu jaxon wrote:
On Thursday, April 1, 2021 at 2:33:50 PM UTC-4, Adrian Caspersz wrote:
On 01/04/2021 19:04, Stu jaxon wrote:
Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??

You missed an 'I'

Googling is remarkably effective with the right input.

e550I-b2 ic901

e.g.

https://www.badcaps.net/forum/showthread.php?t=79046

https://www.badcaps.net/forum/showthread.php?t=70423

Apparently a LD7913JGM6, a PWM controller?

--
Adrian C

I have a .068 ohm resistor reading 0.00.. acting like a short, it is a low ohm resistor, is it supposed to read???



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Default Blown IC

On Tuesday, April 6, 2021 at 8:35:31 AM UTC-4, Stu jaxon wrote:
On Thursday, April 1, 2021 at 2:33:50 PM UTC-4, Adrian Caspersz wrote:
On 01/04/2021 19:04, Stu jaxon wrote:
Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??

You missed an 'I'

Googling is remarkably effective with the right input.

e550I-b2 ic901

e.g.

https://www.badcaps.net/forum/showthread.php?t=79046

https://www.badcaps.net/forum/showthread.php?t=70423

Apparently a LD7913JGM6, a PWM controller?

--
Adrian C

I have a .068 ohm resistor reading 0.00.. acting like a short, it is a low ohm resistor, is it supposed to read???


Did you zero the meter? Sometimes a low value resistor is shunted by a choke, and sometimes some residual voltage in the circuit will throw off a resistance reading. Try removing one lead of the resistor and checking again, and if it's OK, see if it is paralleled with another low resistance component.
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Default Blown IC

On Tuesday, April 6, 2021 at 11:26:35 AM UTC-4, wrote:
On Tuesday, April 6, 2021 at 8:35:31 AM UTC-4, Stu jaxon wrote:
On Thursday, April 1, 2021 at 2:33:50 PM UTC-4, Adrian Caspersz wrote:
On 01/04/2021 19:04, Stu jaxon wrote:
Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??

You missed an 'I'

Googling is remarkably effective with the right input.

e550I-b2 ic901

e.g.

https://www.badcaps.net/forum/showthread.php?t=79046

https://www.badcaps.net/forum/showthread.php?t=70423

Apparently a LD7913JGM6, a PWM controller?

--
Adrian C

I have a .068 ohm resistor reading 0.00.. acting like a short, it is a low ohm resistor, is it supposed to read???

Did you zero the meter? Sometimes a low value resistor is shunted by a choke, and sometimes some residual voltage in the circuit will throw off a resistance reading. Try removing one lead of the resistor and checking again, and if it's OK, see if it is paralleled with another low resistance component.


I did lift a lead, and it's still reading zero, like a short.??? it doesn't look like it's paralleled with another low resistance component.
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Default Blown IC

I have a .068 ohm resistor reading 0.00.. acting like a short, it is a low ohm resistor, is it supposed to read???

Lemme see. 0.068 ohms. Really? That would be within the margin-of-error for many cheap VOMs. Does your meter have a range-adjust? If you are in the 0-10.000 range, you will not get a wiggle at 0.068 ohms. Of you are in the 0-1 ohm range, that is entirely something else.

Peter Wieck
Melrose Park, PA
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Default Blown IC

Stu jaxon wrote:
On Tuesday, April 6, 2021 at 11:26:35 AM UTC-4, wrote:
On Tuesday, April 6, 2021 at 8:35:31 AM UTC-4, Stu jaxon wrote:
On Thursday, April 1, 2021 at 2:33:50 PM UTC-4, Adrian Caspersz wrote:
On 01/04/2021 19:04, Stu jaxon wrote:
Hi Group, need help identifying a blown IC. it's on Vizio e550-b2, power supply board # DPS-167DP ,.. Board locator # ic901, it has 7 pins, and the top is blown away.??

You missed an 'I'

Googling is remarkably effective with the right input.

e550I-b2 ic901

e.g.

https://www.badcaps.net/forum/showthread.php?t=79046

https://www.badcaps.net/forum/showthread.php?t=70423

Apparently a LD7913JGM6, a PWM controller?

--
Adrian C
I have a .068 ohm resistor reading 0.00.. acting like a short, it is a low ohm resistor, is it supposed to read???

Did you zero the meter? Sometimes a low value resistor is shunted by a choke, and sometimes some residual voltage in the circuit will throw off a resistance reading. Try removing one lead of the resistor and checking again, and if it's OK, see if it is paralleled with another low resistance component.


I did lift a lead, and it's still reading zero, like a short.??? it doesn't look like it's paralleled with another low resistance component.


0.068 ohms is basically a short. It's unlikely a resistor will fail
shorted, so leave it alone, it's probably OK.




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Default Blown IC

A 0.068 reading zero is not uncommon. Most ohmmeters do not measure that low. Suffice it to say it is not open, and it is very unlikely to short.

Before changing tht IC, you must find and fix any shorts on the secondary side of the transformer and identify the output pin. It will go straight to the transformers and may have either a cutout around it in the board or a coating of white **** on the board.

Whichever it is, if nothing go with the ohmmeter from the top (+ probably) and find a pin that checks pretty much continuity to that gong to the transformer. Now look around, there will be a diode, resistor and a cap Make sure those components are not open and as they are voltage snubbers without them the IC is destroyed fast.
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