Comments on: What Will Be The Symptom When VGH Is Missing In LED TV? – SAMSUNG UA24H4003AR

By: Parasuraman S

Parasuraman S — Wed, 22 Nov 2023 15:59:26 +0000

A good suggestion! Many thanks for your comments and suggestions!

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By: Yogesh Panchal

Yogesh Panchal — Mon, 20 Nov 2023 14:57:19 +0000

Good job!Sir,
Using variable Dc Bench Power supply is playing good roll for troubleshooting this type of problems where section using specific current.

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By: Parasuraman S

Parasuraman S — Mon, 20 Nov 2023 07:49:41 +0000

In reply to Albert van Bemmelen.

No service manual or schematic was available. Many thanks!

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By: Albert van Bemmelen

Albert van Bemmelen — Sun, 19 Nov 2023 16:24:21 +0000

Noticed that ElektroTanya had given me another wrong servicemanual Parasuraman. That was not the the one I had searched for which explains the differences. I guess you didn't have a matching servicemanual or circuit to go on either and was able to fix the tv wihout it anyway?

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By: Parasuraman S

Parasuraman S — Sun, 19 Nov 2023 08:05:43 +0000

In reply to Albert van Bemmelen.

I could not find any similarity to the chassis in the TV that I repaired. The service manual referred to by you is mentioning about a T-con board and it is not there in the TV that I repaired. Many thanks for the keen interest and efforts you have put in to dig out a schematic.

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 18 Nov 2023 22:39:17 +0000

In reply to Parasuraman S.

Understood dear Parasuraman. The chip I mentioned maybe came from the same tv model with a different chassis version? Document Troubleshooting page 3 of 16, from this service manual provided by Elektrotanya.com=>
https://elektrotanya.com/samsung_ua23h4003ar_chassis_u8ba.rar/download.html#dl
Cheers!

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By: Parasuraman S

Parasuraman S — Sat, 18 Nov 2023 14:07:41 +0000

The CM501 mentioned here is a DC-to-DC converter and booster to provide appropriate voltages to the panel. Kindly see a datasheet here: https://www.alldatasheet.com/datasheet-pdf/pdf/1142234/CHIMEI/CM501.html
It is not a chip mentioned by you. This is a small 48 pin square chip, so small that we need to use microscope and special tools to remove it. It has a heat sink at the bottom and cannot be easily removed like others. Many thanks for your expert comments, observations and input!

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By: Parasuraman S

Parasuraman S — Sat, 18 Nov 2023 13:59:33 +0000

In reply to Waleed Rishmawi.

Yes, dear you are right! Many thanks for your comments and inputs!

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By: Parasuraman S

Parasuraman S — Sat, 18 Nov 2023 13:58:53 +0000

In reply to Tito Kanshulu.

No scalar board was replaced. It cannot be replaced without a need for bonding the COFs. What I did was removing the defective IC and providing all the booster voltages required for proper function of the panel from the external booster board. That board was fixed on a vacant place by double sided tape without causing any hindrance, like how I did in many TV repairs. Many thanks for your comments!

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 18 Nov 2023 07:26:49 +0000

After so many tv repairs you probably immediately knew what the VGH voltage should have been and that it was the only issue here leading to a defective Voltage Booster IC CM501 probably a S13A1D33 chip according to the schematic that delivers 3.3V stua_pw to Tuner TU501 that came from AO6415/Q207 that provided 5.3V_PW to CM501 that was delivered by TPS5432/IC202. This way trying to follow your repair to also learn something. Apparently also another A3.3V_PW was provided by IC201 an AP1117D. All derived from the same B5.3V_PW voltage. But they still were called different A and B feeds. With this specific information that was missing I hope to follow these kind of TV repairs better.

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