Philips BDP-3200 Service Manual

0 (0)

Blu-ray Disc Player

BDP3200/12/05

/93/96/98

TABLE OF CONTENTS

Page

Location of PCB Boards ..................................................1-1

echnical Speciﬁ cations .......................................................1-2

Safety Instruction, Warning & Notes .....................................1-3

Mechanical and Dismantling Instructions ................................2

Software Version & Upgrades, Region Code Change .............3

Trouble Shooting Chart ...........................................................4

Wiring Diagram .......................................................................5

Electrical Diagrams and PCB layouts ......................................6

Set Mechanical Exploded view & Parts List ............................7

Revision List ............................................................................8

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.

Published by Helen 1109 Service Audio Printed in The Netherlands Subject to modification

Version 1.1

Version 0.0

CLASS 1

LASER PRODUCT

314178535801

LOC

LOCA

TION OFOF

PCB

BOARDS

TION

PCB

BOARDS

1-1

BD Loader

Main Board

FE Board

AV Board

Power Board

KE Board

Repair Scenario Matrix

Type/Versions

Board in used

draoB niaM

d(Front Control Board)raoB EF

KE Board

draoB rewoP

draoB VA

UPO

*M: Module Level Repair *C: Component Level Repair

BDP3200

/12

C M M

M M M

/05

M M

M M M

/93

C/M C/M

M M

/96

C/M C/M

M M

/98

C/M C/M

M M

1-2

Specifications

Note

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Region code

This player can play discs with the following region codes.

DVD Blu-ray Countries

Europe, United Kingdom

Playable media

BD-Video DVD-Video, DVD+R/+RW, DVD-R/-RW, DVD+R/-R DL (Dual Layer) VCD/SVCD

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DivX (Ultra)/DivX Plus HD media, MKV media USB storage device

File format

Video: .avi, .divx, .mp4, .mkv Audio: .mp3, .wma, .wav Picture: .jpg, .gif, .png

Video

Signal system: PAL / NTSC Composite video output: 1 Vp-p (75 ohm) HDMI output 480p, 576p, 720p, 1080i, 1080p, 1080p24

Audio

2 Channel analog output

Audio Front L&R : 2 Vrms (> 1 kohm)

Digital output: 0.5 Vp-p (75 ohm)

Coaxial HDMI output Sampling frequency:

MP3: 32 kHz, 44.1 kHz, 48 kHz

WMA: 44.1 kHz, 48 kHz Constant bit rate:

MP3: 112 kbps - 320 kpbs

WMA: 48 kpbs - 192 kpbs

1-3

Specifications

Note

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

Region code

This player can play discs with the following region codes.

DVD Blu-ray Countries

Europe, United Kingdom

USB

Compatibility: Hi-Speed USB (2.0) Class suppor t: USB Mass Storage Class (UMS) File system: FAT16, FAT32 Support HDD (a portable hard drive disc): an external power source may be needed.

Main unit

Power supply rating: AC 220-230V~, 50 Hz Power consumption: 18 W Power consumption in standby mode: < 0.25 W Dimensions (w x h x d): 435 x 42 x 208.5 (mm)  Net Weight: 1.65 kg

Accessories supplied

Remote control and batteries User manual CD-ROM built in multi-lingual user manual (Continental Europe only)

Optional accessory

A wireless Philips USB adapter(named WUB1110, sold separately)

Multimedia connections: Wi-Fi 802.11b/g/n Connectivity: Rear connection (USB) Ambient temperature: 5 deg C to 40 deg C. Dongle dimensions (W x H x D): 28.4 x 82 x 13.4 mm

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Laser Type (Diode): AlGaInN (BD), AlGaInP (DVD/CD) Wave length: 405+7nm/-7nm (BD), 655+10nm/-10nm (DVD), 790+10/-20nm (CD) Output power: 1mW (BD), 0.26mW (DVD), 0.3mW (CD)

1 - 5

2. Safety Instructions, Warnings, Notes, and Abbreviation List

Index of this chapter:

2.1 Safety Instructions

2.2 Warnings

2.3 Notes

2.4 Abbreviation List

2.1 Safety Instructions

Safety regulations require the following during a repair:

• Connect the set to the Mains/AC Power via an isolation transformer (> 800 VA).

• Replace safety components, indicated by the symbol only by components identical to the original ones. Any other component substitution (other than original type) may increase risk of fire or electrical shock hazard.

Safety regulations require that after a repair, the set must be returned in its original condition. Pay in particular attention to the following points:

• Route the wire trees correctly and fix them with the mounted cable clamps.

• Check the insulation of the Mains/AC Power lead for external damage.

• Check the strain relief of the Mains/AC Power cord for proper function.

• Check the electrical DC resistance between the Mains/AC Power plug and the secondary side (only for sets that have a Mains/AC Power isolated power supply):

1. Unplug the Mains/AC Power cord and connect a wire

between the two pins of the Mains/AC Power plug.

2. Set the Mains/AC Power switch to the “on” position

(keep the Mains/AC Power cord unplugged!).

3. Measure the resistance value between the pins of the

Mains/AC Power plug and the metal shielding of the tuner or the aerial connection on the set. The reading should be between 4.5 M: and 12 M:.

4. Switch “off” the set, and remove the wire between the

two pins of the Mains/AC Power plug.

• Check the cabinet for defects, to prevent touching of any inner parts by the customer.

2.2 Warnings

• All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD ). Careless handling during repair can reduce life drastically. Make sure that, during repair, you are connected with the same potential as the mass of the set by a wristband with resistance. Keep components and tools also at this same potential.

• Be careful during measurements in the high voltage section.

• Never replace modules or other components while the unit is switched “on”.

• When you align the set, use plastic rather than metal tools. This will prevent any short circuits and the danger of a circuit becoming unstable.

2.3 Notes

2.3.1 General

• Measure the voltages and waveforms with regard to the chassis (= tuner) ground ( ), or hot ground ( ), depending on the tested area of circuitry. The voltages and waveforms shown in the diagrams are indicative. Measure them in the Service Default Mode (see chapter 5) with a colour bar signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated otherwise) and picture carrier at 475.25 MHz for PAL, or

61.25 MHz for NTSC (channel 3).

• Where necessary, measure the waveforms and voltages with ( ) and without ( ) aerial signal. Measure the voltages in the power supply section both in normal operation ( ) and in stand-by ( ). These values are indicated by means of the appropriate symbols.

2.3.2 Schematic Notes

• All resistor values are in ohms, and the value multiplier is often used to indicate the decimal point location (e.g. 2K2 indicates 2.2 k:).

• Resistor values with no multiplier may be indicated with either an “E” or an “R” (e.g. 220E or 220R indicates 220 :).

• All capacitor values are given in micro-farads (P u10 nano-farads (n u10

• Capacitor values may also use the value multiplier as the decimal point indication (e.g. 2p2 indicates 2.2 pF).

• An “asterisk” (*) indicates component usage varies. Refer to the diversity tables for the correct values.

• The correct component values are listed in the Spare Parts List. Therefore, always check this list when there is any doubt.

2.3.3 BGA (Ball Grid Array) ICs

Introduction

For more information on how to handle BGA devices, visit this URL: www.atyourservice.ce.philips.com (needs subscription, not available for all regions). After login, select “Magazine”, then go to “Repair downloads”. Here you will find Information on how to deal with BGA-ICs.

BGA Temperature Profiles

For BGA-ICs, you must use the correct temperature-profile, which is coupled to the 12NC. For an overview of these profiles, visit the website www.atyourservice.ce.philips.com (needs subscription, but is not available for all regions) You will find this and more technical information within the “Magazine”, chapter “Repair downloads”. For additional questions please contact your local repair help desk.

2.3.4 Lead-free Soldering

Due to lead-free technology some rules have to be respected by the workshop during a repair:

• Use only lead-free soldering tin Philips SAC305 with order code 0622 149 00106. If lead-free solder paste is required, please contact the manufacturer of your soldering equipment. In general, use of solder paste within workshops should be avoided because paste is not easy to store and to handle.

• Use only adequate solder tools applicable for lead-free soldering tin. The solder tool must be able: – To reach a solder-tip temperature of at least 400°C. – To stabilize the adjusted temperature at the solder-tip. – To exchange solder-tips for different applications.

• Adjust your solder tool so that a temperature of around 360°C - 380°C is reached and stabilized at the solder joint. Heating time of the solder-joint should not exceed ~ 4 sec. Avoid temperatures above 400°C, otherwise wear-out of tips will increase drastically and flux-fluid will be destroyed. To avoid wear-out of tips, switch “off” unused equipment or reduce heat.

• Mix of lead-free soldering tin/parts with leaded soldering tin/parts is possible but PHILIPS recommends strongly to avoid mixed regimes. If this cannot be avoided, carefully clear the solder-joint from old tin and re-solder with new tin.

-9

), or pico-farads (p u10

-12

-6

Safety Instructions, Warnings, Notes, and Abbreviation List

2.3.5 Alternative BOM identification

1 - 6

2.4 Abbreviation List

It should be noted that on the European Service website, “Alternative BOM” is referred to as “Design variant”.

The third digit in the serial number (example: KX2B0835000001) indicates the number of the alternative B.O.M. (Bill Of Materials) that has been used for producing the specific AV set. In general, it is possible that the same AV model on the market is produced with e.g. two different types of display, coming from two different suppliers. This will then result in sets which have the same CTN (Commercial Type Number; e.g. MCM394/12) but which have a different B.O.M. number.

Also, it is possible that same model on the market is produced with two production centers, however their partslist is the same. In such case, no alternative B.O.M. will be created.

By looking at the third digit of the serial number, one can identify which B.O.M. is used for the set he is working with. If the third digit of the serial number contains the number “1” (example: KX 1B033500001), then the set has been manufactured according to B.O.M. number 1. If the third digit is a “2” (example: KX 2B0335000001), then the set has been produced according to B.O.M. no. 2. This is important for ordering the correct spare parts! For the third digit, the numbers 1...9 and the characters A...Z can be used, so in total: 9 plus 26= 35 different B.O.M.s can be indicated by the third digit of the serial number.

Identification: The bottom line of a type plate gives a 14-digit serial number. Digits 1 and 2 refer to the production centre (e.g. LM is Arts), digit 3 refers to the B.O.M. code, digit 4 refers to the Service version change code, digits 5 and 6 refer to the production year, and digits 7 and 8 refer to production week (in example below it is 2008 week 50). The 6 last digits contain the serial number.

Model FWM572/12 220-230 50Hz 60W

FWM572/12

LM1A0850005644

Figure 2-1 Serial number (example)

2.3.6 Module Level Repair (MLR) or Component Level Repair (CLR)

If a board is defective, consult your repair procedure to decide if the board has to be exchanged or if it should be repaired on component level. If your repair procedure says the board should be exchanged completely, do not solder on the defective board. Otherwise, it cannot be returned to the O.E.M. supplier for back charging!

2.3.7 Practical Service Precautions

• It makes sense to avoid exposure to electrical shock.

While some sources are expected to have a possible dangerous impact, others of quite high potential are of limited current and are sometimes held in less regard.

• Always respect voltages. While some may not be

dangerous in themselves, they can cause unexpected reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.

0/6/12 SCART switch control signal on A/V

board. 0 = loop through (AUX to TV), 6 = play 16 : 9 format, 12 = play 4 : 3

format 2DNR Spatial (2D) Noise Reduction 3DNR Temporal (3D) Noise Reduction AARA Automatic Aspect Ratio Adaptation:

algorithm that adapts aspect ratio to

remove horizontal black bars; keeps

the original aspect ratio ACI Automatic Channel Installation:

algorithm that installs TV channels

directly from a cable network by

means of a predefined TXT page ADC Analogue to Digital Converter AFC Automatic Frequency Control: control

signal used to tune to the correct

frequency AGC Automatic Gain Control: algorithm that

controls the video input of the feature

box AM Amplitude Modulation ANR Automatic Noise Reduction: one of the

algorithms of Auto TV AP Asia Pacific AR Aspect Ratio: 4 by 3 or 16 by 9 ASF Auto Screen Fit: algorithm that adapts

aspect ratio to remove horizontal black

bars without discarding video

information ATSC Advanced Television Systems

Committee, the digital TV standard in

the USA ATV See Auto TV Auto TV A hardware and software control

system that measures picture content,

and adapts image parameters in a

dynamic way AV External Audio Video AVC Audio Video Controller AVIP Audio Video Input Processor B/G Monochrome TV system. Sound

carrier distance is 5.5 MHz BLR Board-Level Repair BTSC Broadcast Television Standard

Committee. Multiplex FM stereo sound

system, originating from the USA and

used e.g. in LATAM and AP-NTSC

countries B-TXT Blue TeleteXT C Centre channel (audio) CEC Consumer Electronics Control bus:

remote control bus on HDMI

connections CL Constant Level: audio output to

connect with an external amplifier CLR Component Level Repair COLUMBUS COlor LUMinance Baseband

Universal Sub-system ComPair Computer aided rePair CP Connected Planet / Copy Protection CSM Customer Service Mode CTI Color Transient Improvement:

manipulates steepness of chroma

transients CVBS Composite Video Blanking and

Synchronization DAC Digital to Analogue Converter DBE Dynamic Bass Enhancement: extra

low frequency amplification DDC See “E-DDC”

1 -7

Safety Instructions, Warnings, Notes, and Abbreviation List

D/K Monochrome TV system. Sound

carrier distance is 6.5 MHz DFI Dynamic Frame Insertion DFU Directions For Use: owner's manual DMR Digital Media Reader: card reader DMSD Digital Multi Standard Decoding DNM Digital Natural Motion DNR Digital Noise Reduction: noise

reduction feature of the set DRAM Dynamic RAM DRM Digital Rights Management DSP Digital Signal Processing DST Dealer Service Tool: special remote

control designed for service

technicians DTCP Digital Transmission Content

Protection; A protocol for protecting

digital audio/video content that is

traversing a high speed serial bus,

such as IEEE-1394 DVB-C Digital Video Broadcast - Cable DVB-T Digital Video Broadcast - Terrestrial DVD Digital Versatile Disc DVI(-d) Digital Visual Interface (d= digital only) E-DDC Enhanced Display Data Channel

(VESA standard for communication

channel and display). Using E-DDC,

the video source can read the EDID

information form the display. EDID Extended Display Identification Data

(VESA standard) EEPROM Electrically Erasable and

Programmable Read Only Memory EMI Electro Magnetic Interference EPLD Erasable Programmable Logic Device EU Europe EXT EXTernal (source), entering the set by

SCART or by cinches (jacks) FBL Fast BLanking: DC signal

accompanying RGB signals FDS Full Dual Screen (same as FDW) FDW Full Dual Window (same as FDS) FLASH FLASH memory FM Field Memory or Frequency

Modulation FPGA Field-Programmable Gate Array FTV Flat TeleVision Gb/s Giga bits per second G-TXT Green TeleteXT H H_sync to the module HD High Definition HDD Hard Disk Drive HDCP High-bandwidth Digital Content

Protection: A “key” encoded into the

HDMI/DVI signal that prevents video

data piracy. If a source is HDCP coded

and connected via HDMI/DVI without

the proper HDCP decoding, the

picture is put into a “snow vision” mode

or changed to a low resolution. For

normal content distribution the source

and the display device must be

enabled for HDCP “software key”

decoding. HDMI High Definition Multimedia Interface HP HeadPhone

dnuoS.metsysVTemorhconoMI

C Inter IC bus

D Inter IC Data bus

S Inter IC Sound bus

carrier distance is 6.0 MHz

IF Intermediate Frequency Interlaced Scan mode where two fields are used

to form one frame. Each field contains

half the number of the total amount of

lines. The fields are written in “pairs”,

causing line flicker. IR Infra Red IRQ Interrupt Request ITU-656 The ITU Radio communication Sector

(ITU-R) is a standards body

subcommittee of the International

Telecommunication Union relating to

radio communication. ITU-656 (a.k.a.

SDI), is a digitized video format used

for broadcast grade video.

Uncompressed digital component or

digital composite signals can be used.

The SDI signal is self-synchronizing,

uses 8 bit or 10 bit data words, and has

a maximum data rate of 270 Mbit/s,

with a minimum bandwidth of 135

MHz. ITV Institutional TeleVision; TV sets for

hotels, hospitals etc. JOP Jaguar Output Processor LS Last Status; The settings last chosen

by the customer and read and stored

in RAM or in the NVM. They are called

at start-up of the set to configure it

according to the customer's

preferences LATAM Latin America LCD Liquid Crystal Display LED Light Emitting Diode L/L' Monochrome TV system. Sound

carrier distance is 6.5 MHz. L' is Band

I, L is all bands except for Band I LORE LOcal REgression approximation

noise reduction LPL LG.Philips LCD (supplier) LS Loudspeaker LVDS Low Voltage Differential Signalling Mbps Mega bits per second M/N Monochrome TV system. Sound

carrier distance is 4.5 MHz MIPS Microprocessor without Interlocked

Pipeline-Stages; A RISC-based

microprocessor MOP Matrix Output Processor MOSFET Metal Oxide Silicon Field Effect

Transistor, switching device MPEG Motion Pictures Experts Group MPIF Multi Platform InterFace MUTE MUTE Line NC Not Connected NICAM Near Instantaneous Compounded

Audio Multiplexing. This is a digital

sound system, mainly used in Europe. NTC Negative Temperature Coefficient,

non-linear resistor NTSC National Television Standard

Committee. Color system mainly used

in North America and Japan. Color

carrier NTSC M/N= 3.579545 MHz,

NTSC 4.43= 4.433619 MHz (this is a

VCR norm, it is not transmitted off-air) NVM Non-Volatile Memory: IC containing

TV related data such as alignments O/C Open Circuit OSD On Screen Display OTC On screen display Teletext and

Control; also called Artistic (SAA5800) P50 Project 50: communication protocol

between TV and peripherals PAL Phase Alternating Line. Color system

mainly used in West Europe (color

carrier= 4.433619 MHz) and South

America (color carrier PAL M=

1 - 8

Safety Instructions, Warnings, Notes, and Abbreviation List

3.575612 MHz and PAL N= 3.582056

MHz) PCB Printed Circuit Board (same as “PWB”) PCM Pulse Code Modulation PDP Plasma Display Panel PFC Power Factor Corrector (or Pre-

conditioner) PIP Picture In Picture PLL Phase Locked Loop. Used for e.g.

FST tuning systems. The customer

can give directly the desired frequency POR Power On Reset, signal to reset the uP Progressive Scan Scan mode where all scan lines are

displayed in one frame at the same

time, creating a double vertical

resolution. PTC Positive Temperature Coefficient,

non-linear resistor PWB Printed Wiring Board (same as “PCB”) PWM Pulse Width Modulation QRC Quasi Resonant Converter QTNR Quality Temporal Noise Reduction QVCP Quality Video Composition Processor RAM Random Access Memory RGB Red, Green, and Blue. The primary

color signals for TV. By mixing levels

of R, G, and B, all colors (Y/C) are

reproduced. RC Remote Control RC5 / RC6 Signal protocol from the remote

control receiver RESET RESET signal ROM Read Only Memory R-TXT Red TeleteXT SAM Service Alignment Mode S/C Short Circuit SCART Syndicat des Constructeurs

d'Appareils Radiorécepteurs et

SCL Serial Clock I

Téléviseurs

SCL-F CLock Signal on Fast I SD Standard Definition SDA Serial Data I SDA-F DAta Signal on Fast I

C bus

C bus SDI Serial Digital Interface, see “ITU-656” SDRAM Synchronous DRAM SECAM SEequence Couleur Avec Mémoire.

Color system mainly used in France and East Europe. Color carriers=

4.406250 MHz and 4.250000 MHz SIF Sound Intermediate Frequency SMPS Switched Mode Power Supply SoC System on Chip SOG Sync On Green SOPS Self Oscillating Power Supply S/PDIF Sony Philips Digital InterFace SRAM Static RAM SRP Service Reference Protocol SSB Small Signal Board STBY STand-BY SVGA 800x600 (4:3) SVHS Super Video Home System SW Software SWAN Spatial temporal Weighted Averaging

Noise reduction SXGA 1280x1024 TFT Thin Film Transistor THD Total Harmonic Distortion TMDS Transmission Minimized Differential

Signalling TXT TeleteXT TXT-DW Dual Window with TeleteXT UI User Interface uP Microprocessor UXGA 1600x1200 (4:3)

V V-sync to the module VCR Video Cassette Recorder VESA Video Electronics Standards

Association VGA 640x480 (4:3) VL Variable Level out: processed audio

output toward external amplifier VSB Vestigial Side Band; modulation

method WYSIWYR What You See Is What You Record:

record selection that follows main

picture and sound WXGA 1280x768 (15:9) XTAL Quartz crystal XGA 1024x768 (4:3) Y Luminance signal Y/C Luminance (Y) and Chrominance (C)

signal YPbPr Component video. Luminance and

scaled color difference signals (B-Y

and R-Y) YUV Component video

2-1

Mechanical and Dismantling Instructions

Dismantling Instruction

The following guidelines show how to dismantle the player. Step1: Remove 6 screws around the Top Cover, and then remove the Top Cover (Figure 1).

Detailed information please refer to the model set.

Figure 1

Step2: If it is necessary to dismantle Loader or Front Panel, the Front door should be removed first. (Figure 2) Note: Make sure to operate gently otherwise the guider would be damaged.

Please kindly note that dismantle the front door

assembly carefully to avoid damage tray and the front door.

Figure 2

2-2

Mechanical and Dismantling Instructions

Detailed information please refer to the model set.

Dismantling Instruction

Step3: Dismantling Front Panel, disconnect the connectors (J502, JI) (Figure 3)

Figure 3

Step4: Dismantling Front Panel,

out from the set. (Figure 4 )

need release 2 snaps of Front Panel and 2 snaps of bottom cabinet , then gently pull the Panel

Figure 4

2-3

Mechanical and Dismantling Instructions

Dismantling Instruction

Step5: Dismantling Loader, disconnect the 3 connectors (HA800 CON801, HA900)(Figure 3) aiming in the below figure, and remove 4

screws that connects the loader and the bottom cabinet. (Figure 4-5)

Detailed information please refer to the model set.

Figure 5

Step6: Dismantling Main Board and AV Board, first disconnect the connector (J1), and then remove 5 screws. (Figure 6)

Step7:Remove 3 screws on Power Board to dismantle the Power Board. (Figure 6)

Figure 6

Software checking and upgrade

Preparation to upgrade software

1)Start the CD burning software & create a folder named "UPG_ALL",

A. Procedure for software upgrade

A) Upgrade software via Disc

CDR.

eht htiw esnopser & csid gnidaer strats lliw tes ehT )2

following display TV screen:

Now searching for upgrade software! Please wait…!

3)Wait for a few seconds after the screen will display : Upgrade software for this player have been found.Do you want to upgrade?

Cancel Start

<OK>

5) The software will updagrde and screen will display as below: Upgrade is ongoing, Please wait…

Please do not unplug or switch off the device.

6) The screen will display as below when upgrading complete: Upgrade has completed successfully!

Power off after 5s.

Restart now

5) Restart the set.

3-1

B. Read out the software versions to confirm upgrading

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trol.

3) Select <Setup>, then press <OK>.

4) Select <Advanced Setup>, press right cursor to choose

<Version Info.>, then press <OK>, the software version

and other information will display on the TV screen as below:

Versions:

XX/0023PDB:led

System SW:X.XX

MAC:XX-XX-XX-XX-XX-XX

http://www.philips.com/support

Caution: The set must not be power off during upgrading, otherwise the Main board will be damaged entirely.

B) Upgrade software via network:

1) Setup the network connection (See "Getting started">"Set up network").

<Software Update>-<Network>. * You are prompted to start upgrading processes if upgrade media is detected.

operation.

truns off to standby.

4) Disconnect the power cord for a few seconds and connect again to turn on the player.

C) Update software via USB Flash Drive:

1) Go to www.philips.com/support to check if the latest software version is available for this player.

2) Download the software onto a USB flash drive.

3) Insert the USB flash drive to the USB jack of the rear panel.

>-<USB>.

F O

standby.

6) Disconnect the power cord for a few seconds and connect again to turn on the player.

4-1

No display on VFD, and buttons do not work

Trouble shooting chart

No display on VFD, and

buttons do not work

Yes

Check every supply voltage on PSU, main board, key board, and VFD board

Fix the open circuit or short circuit

which may exist on PCBs and

cables

Yes

Check whether every pin of JP2, CN6, and CN7 on KEY board connects well to main board and VFD board

Fix JP2, CN6, CN7

Yes

1. Check whether any bad component or soldering exists on VFD board and KEY board,

2. Check whether the circuit connected to the keys is broken.

Yes

Replace the VFD driver IC or the whole

key board and VFD board

Fix the PCB or bad component

+ 28 hidden pages