SAMSUNG YPE64P Service Manual Troubleshooting

2. Troubleshooting

2-1 Main Board

Symtoms

Possible Casuses

Check Points

	Displays " "only	- Faulty U4, U5
		- Open PCB Pattern
	Faulty file downloading	- Open PCB Pattern
		- Faulty J4 connector
	No "Connect" displayed	- Cold soldering on
	during downloading	(HCLK,HACK,#REVEREQ)
	Faulty recognition of	- Open or Short PCB
	memory	- Fault Flash Memory
	Faulty switch operation	- Cold soldering on switch
		- Open PCB pattern
	No power on	Faulty##U2

-U1 (OKI MCU) Vdd

-U1 pin

-Ports between J4 and U1(OKI MCU)

-J4pin 10,11,14

-Pattern between U1 and memory chips

-Open/Short test of switch

-Mechanical parts

U2 pin 7, 12, 39(high)

Action

Replace

Main board

2-2 LCD Board

	Symtoms	Possible Casuses	Check Points	Action
	- Nothing displayed on	- Open pattern between	- Voltage on U2 pin15
	LCD panel	U2 pins	Should be higher	Replace
			then 2.7 Volts
		- Short circuit between
	- Broken Characters or	U2 pins	- Heatseal contact	LCD board
	Missing icons	- Loose contact of
		heatseal
	- Falulty control button	- Faulty tact switch	- Mechanical parts
			- Open/Short test of
	- (Play,Stop,FF,Rew)	- Open pattern to U2
			switch
	- No voice recording	- Cold soldering on R14	- Power and Output
		- Faulty U3	of U3

2-1	Samsung Electronics

2-3. Troubleshooting

2-3-1. NO Display (Power on Start)

Samsung Electronics

2-2

2-3-2. Display ‘NO SONG‘

2-3-3. No ‘CONNECT‘ message when cable connected

2-3	Samsung Electronics

2-3-4. No voice Recording

2-3-5. No playback

Samsung Electronics

2-4

2-3-3-1. Wave Form

2-3-4-1. Wave form

2-5	Samsung Electronics