Hyundai HLT-3270 Repair - Revision history

Tom at 23:09, 18 October 2014

2014-10-18T23:09:22Z

Tom at 23:07, 18 October 2014

2014-10-18T23:07:50Z

Tom at 23:06, 18 October 2014

2014-10-18T23:06:57Z

Tom: /* Power Supply BP-170AWL */

2014-10-18T23:04:08Z

‎Power Supply BP-170AWL

Tom: /* Solution */

2014-10-18T23:00:34Z

‎Solution

Tom at 22:58, 18 October 2014

2014-10-18T22:58:55Z

Tom at 22:55, 18 October 2014

2014-10-18T22:55:34Z

Tom at 22:47, 18 October 2014

2014-10-18T22:47:13Z

Tom at 22:26, 18 October 2014

2014-10-18T22:26:50Z

Tom: Created page with "I recently got a 9 year old HLT-3270 32" LCD TV and thought it would be worth fixing. = The Defect = TV will not turn on, no power LED on, no current draw on the mains supply. M..."

2014-10-18T22:21:07Z

Created page with "I recently got a 9 year old HLT-3270 32" LCD TV and thought it would be worth fixing. = The Defect = TV will not turn on, no power LED on, no current draw on the mains supply. M..."

New page

I recently got a 9 year old HLT-3270 32" LCD TV and thought it would be worth fixing.

= The Defect =
TV will not turn on, no power LED on, no current draw on the mains supply. Mains fuse on the power supply broken.

= Power Supply =
This set uses a ''Bentec DMC BP-170AWL'' power supply according to the sticker on the circuit board. I was not able to find schematics on that particular board.

Key parts:
* '''PFC controller:''' Fairchild FAN7527B
* '''PWM controller, switch''' Fairchild FS7M0880

@@ Line 1: / Line 1: @@
 I recently got a 9 year old HLT-3270 32" LCD TV and thought it would be worth fixing.
-''The following describes what I did in order to get the TV working again. I´m not an expert on this. Use this information on your own risk. Think about what you´re doing before removing any screws and take full responsibility for it.''
+''The following describes what I did in order to get the TV working again. I´m not an expert on this. Use this information on your own risk. Think about what you´re doing before removing any screws and take full responsibility for it. Note that there are dangerous voltages present within the device, even minutes after it has been plugged off.''
 = The Defect =

← Older revision		Revision as of 23:06, 18 October 2014
Line 1:		Line 1:
	I recently got a 9 year old HLT-3270 32" LCD TV and thought it would be worth fixing.		I recently got a 9 year old HLT-3270 32" LCD TV and thought it would be worth fixing.
		+	''The following describes what I did in order to get the TV working again. I´m not an expert on this. Follow or don´t follow these instructions on your own risk. Think about what you´re doing before removing any screws and take full responsibility for it.''

	= The Defect =		= The Defect =

@@ Line 13: / Line 13: @@
 Datasheets can be easily found. The FS7M0880´s application note ''AN4121'' ist particulary interesting.
-The TV can simply be powered by applying 12V/1,5A and 24V/5A which I tested with lab power supplies. That could be an option if the original PSU cannot be repaired.
+The TV can simply be powered by applying 12V/1A and 24V/5A which I tested with lab power supplies. That could be an option if the original PSU cannot be repaired.
 <gallery>

@@ Line 34: / Line 34: @@
 Again, these caps were all dead or got far less than their original capacitance!
-No semiconductor parts were obvious damaged. I did not care about most of the capacitors on the secondary side - although they are ''Samyoung'' types too and might be in good condition too.
+No semiconductor parts were obvious damaged. I did not care about most of the capacitors on the secondary side - although they are ''Samyoung'' types and might not be in good condition too.
 After the repair, the set works fine again. The power supply got a standby power consumption of approx. 10W which appears a bit too high. Possibly there is still something wrong with the standby/burst mode?

@@ Line 2: / Line 2: @@
 = The Defect =
-TV will not turn on, no power LED on, no current draw on the mains supply. Mains fuse on the power supply broken.
+TV will not turn on, no power LED on, no current draw on the mains supply. Mains fuse on the power supply is open.
 = Power Supply BP-170AWL =
-This set uses a ''Bentek DMC BP-170AWL'' power supply according to the sticker on the circuit board. I was not able to find schematics on that particular board.
+This set uses a ''Bentek DMC BP-170AWL'' power supply according to the sticker on the circuit board. I was not able to find schematics on that particular board. It provides only 12V and 24V to the TV main board and backlight converters and the output pins are labeled.
 '''Key parts:'''
@@ Line 13: / Line 13: @@
 Datasheets can be easily found. The FS7M0880´s application note ''AN4121'' ist particulary interesting.
-The TV can simply be powered by applying 12V/1,5A and 24V/5A which I tested with lab power supplies.
+The TV can simply be powered by applying 12V/1,5A and 24V/5A which I tested with lab power supplies. That could be an option if the original PSU cannot be repaired.
 <gallery>
@@ Line 36: / Line 36: @@
 No semiconductor parts were obvious damaged. I did not care about most of the capacitors on the secondary side - although they are ''Samyoung'' types too and might be in good condition too.
-After the repair, the set works fine agein. The power supply got a standby power consumption of approx. 10W which appears a bit too high. Possibly there is still something wrong with the standby/burst mode?
+After the repair, the set works fine again. The power supply got a standby power consumption of approx. 10W which appears a bit too high. Possibly there is still something wrong with the standby/burst mode?

@@ Line 4: / Line 4: @@
 TV will not turn on, no power LED on, no current draw on the mains supply. Mains fuse on the power supply broken.
-= Power Supply =
+= Power Supply BP-170AWL =
 This set uses a ''Bentek DMC BP-170AWL'' power supply according to the sticker on the circuit board. I was not able to find schematics on that particular board.
@@ Line 12: / Line 12: @@
 * '''Diode for PFC''' STTH8L06 (assumption)
 Datasheets can be easily found. The FS7M0880´s application note ''AN4121'' ist particulary interesting.
 I tested the rectifier, diodes, the PFC´s FET, and the power switch for shorts. All capacitors where at least not shorted. Then I supplied PFC and PWM controller with an external supply voltage and found the current draw of approx. 20mA ok. After replacing the fuse, I slowly powered up the device with a 60W light bulp in series. It turned out that the power supply tries to start up, fails and retries several times per second.
@@ Line 26: / Line 32: @@
 * F1 T3,15A
-Again, these were all dead or got far less than their original capacitance!
+Again, these caps were all dead or got far less than their original capacitance!
 No semiconductor parts were obvious damaged. I did not care about most of the capacitors on the secondary side - although they are ''Samyoung'' types too and might be in good condition too.

← Older revision		Revision as of 22:26, 18 October 2014
Line 10:		Line 10:
	* '''PFC controller:''' Fairchild FAN7527B		* '''PFC controller:''' Fairchild FAN7527B
	* '''PWM controller, switch''' Fairchild FS7M0880		* '''PWM controller, switch''' Fairchild FS7M0880
		+	* '''Diode for PFC''' STTH8L06 (assumption)
		+	Datasheets can be easily found. The FS7M0880´s application note ''AN4121'' ist particulary interesting.