SAMSUNG YPE64P Service Manual Troubleshooting

2-1 Samsung Electronics

2-1 Main Board

Symtoms

Possible Casuses

Check Points

Action

Displays " "only

- Faulty U4, U5

- Open PCB Pattern

- U1 (OKI MCU) Vdd

- U1 pin

Replace

Main board

- Ports between J4 and
U1(OKI MCU)

- Open PCB Pattern

- Faulty J4 connector

No "Connect" displayed
during downloading

- Cold soldering on
(HCLK,HACK,#REVEREQ)

Faulty file downloading

- J4pin 10,11,14

Faulty recognition of
memory

- Open or Short PCB

- Fault Flash Memory

- Pattern between U1
and memory chips

- Cold soldering on switch

- Open PCB pattern

Faulty switch operation

- Open/Short test of
switch

- Mechanical parts

Faulty##U2

No power on

U2 pin 7, 12, 39(high)

2-2 LCD Board

Symtoms

Possible Casuses

Check Points

- Nothing displayed on
LCD panel

- Open pattern between
U2 pins

- Voltage on U2 pin15
Should be higher
then 2.7 Volts

- Broken Characters or
Missing icons

- Short circuit between
U2 pins

- Loose contact of
heatseal

- Heatseal contact

Replace

LCD board

- Falulty control button

- (Play,Stop,FF,Rew)

- Faulty tact switch

- Open pattern to U2

- Mechanical parts

- Open/Short test of
switch

- No voice recording

- Cold soldering on R14

- Faulty U3

- Power and Output
of U3

Action

2. Troubleshooting

Samsung Electronics 2-2

2-3. Troubleshooting

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

2-3 Samsung Electronics

2-3-2. Display ‘NO SONG‘

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

Samsung Electronics 2-4

2-3-4. No voice Recording

2-3-5. No playback

2-5 Samsung Electronics

2-3-3-1. Wave Form

2-3-4-1. Wave form